2019-10-28- Stockstill, Ray - basis for the senior PE_ QSD_P's inclusion of freeboardFrom: Ray Stockstill <scnbeach@earthlink.net>
Sent: Monday, October 28, 2019 1:29 PM
To: AJ Ortega
Cc: Bryan McKinney; Amy Yu
Subject: RE: the basis for the senior PE, QSD/P's inclusion of freeboard
EXTERNAL: This message originated outside of the City of La Quinta. Please use proper judgement and caution when opening
attachments, clicking links or responding to requests for information.
Thank you and it is greatly appreciated. Ray
From: AJ Ortega [mailto:Aortega@laquintaca.gov]
Sent: Monday, October 28, 2019 6:24 PM
To: Ray Stockstill
Cc: Bryan McKinney; Amy Yu
Subject: RE: the basis for the senior PE, QSD/P's inclusion of freeboard
Mr. Stockstill,
In regard to the permitting, the Building Division does not issue permits specifically for drilling, the
building code applies to the construction, alteration, relocation, enlargement, replacement, repair,
equipment, use and occupancy, location, maintenance, removal and demolition of every building or
structure or any appurtenances connected or attached to such buildings or structures, and that is where
our authority is limited. So when I mentioned at your discretion, I was saying the choice of how to install
the pipe is yours, but a permit is required for its installation.
Then attached is the 2016 California Plumbing Code Section for Material Uses in Storm Drainage, I've
highlighted the section I referenced previously, and because it is referenced for compliance of
Underground Building Storm Drains in Section 1101.4.4, I also included Table 701.2. I think "conduit" is
an acceptable general term that could apply outside of the electrical realm, the plumbing code for example
also uses "conductor" which is another term that most would apply to electrical, but based on common
definitions you could use them in both trades. To provide a direct answer to your question though, Table
1101.6 does not mention flexible conduit, and that is because it lists material type and not material
characteristics. Manufacturers of polyethylene (PE) products do make flexible versions, the same with
PVC, so as long as they are listed to the Referenced Standard they would be approved for use.
Amy is also working on getting the elevation information for you.
AJ
From: Ray Stockstill <scnbeach @earth link.net>
Sent: Friday, October 25, 2019 4:25 AM
To: AJ Ortega <Aortega@laquintaca.gov>
Cc: Bryan McKinney <Bmckinney@lag uintaca.gov>; Amy Yu <Ayu@laquintaca.gov>
Subject: RE: the basis for the senior PE, QSD/P's inclusion of freeboard
EXTERNAL: This message originated outside of the City of La Quinta. Please use proper judgement and caution when opening
attachments, clicking links or responding to requests for information.
AJ,
3. 1 want a copy of the elevation information that was submitted to the City for Lot 13 at 57865 Rosewood Court to get
the construction permit for my home.
4. Do I need a permit to drill under my home? If yes, then it is up to the City to decide if I can. If I wanted to increase the
height of my privacy wall by 20 feet on all 3 sides, would you let me? The City has the final say on construction permits,
not me ...... is that correct?
5. Conduit is an electrical term, correct? Chapter 11 of the plumbing codes are the applicable codes. Please tell me
where one of the options is flexible conduit. You stated "I would say "sloped to drain" as even in the Chapter 11 (Storm
Drainage) of the Plumbing Code it references drainage slopes as low as 1/8" per foot in Table 1101.6, which is very low
sloped." Does Table 1101.6 mention the use of flexible conduit? Tell me what code allows flexible conduit for residential
rainwater drainage.
I have two complaints involving alleged wire fraud and mail fraud pending that were submitted to the FBI. I believe they
are criminal complaints. When someone misrepresents the truth or lies in an email, technically it can be considered wire
fraud. One of my complaints includes the Board for Professional Engineers and CSLB as co-conspirators because both
allegedly lied on numerous occasions in emails and letters. I approached both for help and both allegedly lied to
allegedly help their licensees. Example - The plumbing plan calls for 2 drainage systems (See Figure 1). It was the civil's
job to say where the 2 inlets were to be located in the precise grading plan (See Figure 2 and #5 below). The builder
hired an attorney to handle my claim. He then hired an engineer as his industry expert. They visited the home on
January 9, 2015. On February 18, 2015 the attorney said the drainage system was fine and denied liability. In May (I
think it was the 91h), 2015 1 arranged to review the plans for my home with Jim Johnson. The precise grading plan on file
at the City was signed by a Mr. Shaw with Adams Streeter Civil Engineers, Inc.. Mr. Johnson gave me a copy of it that he
had heighted in yellow prior to my arrival. The expert that the attorney hired was a civil engineer named Nicholas
Streeter with Adams Streeter Civil Engineers, Inc. I filed a complaint with the Board for Professional Engineers alleging
that Mr. Streeter had a conflict of interest in serving as the attorney's expert and that he and others had conspired to
defraud me. The Board won't let me submit a fraud complaint and they changed my complaint without my permission
to one against Mr. Shaw, hired their own expert who said Mr. Shaw wasn't negligent. I'm telling you this for a reason.
My fight isn't with the City of La Quinta. I contacted the City for information that I want to give to the FBI regarding my
complaints. Freeboard isn't the different between the WSE in the retention basin and my PAD. We all know that. Please
just give me accurate answers to my questions. I'm not looking for more people to add to my complaints. This isn't a
threat. I just want accurate answers. For example, as -built is there a minimum of a 1 foot freeboard along the entire PAD
line facing the street? Was a 6-inch delta between the FF and the PAD assumed in the information submitted to the
City? If the as -built delta between the FF and the PAD were actually 24-inches, is that the PAD elevation that should
have been used? If no, what code supports that position? The complaint that the Board and CSLB are part of is against
the out of state insurer. Long story but that is why it is an interstate complaint.
4
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Figure 1 —The plumbing plan shows 2 drainage lines.
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T"Ar 4 TtilrR Y1f1 L TOFigure 2 — Note 5 shows it was Shaw's job to show where the 2 drain lines went in the courtyard on his precise grading
plan. As -built there are no roof downspouts as mentioned in #6. 1 believe the drain grate was sized assuming the
downspouts would drain directly to the 2 drainage lines and not through either of the 2 inlet drain grates.
4
Figure 3 — Mr. Johnson gave me this when I first visited the City in May, 2015. It shows that Mr. Shaw only had a single
drain line. He forgot the OVERFLOW drain line. Mr. Streeter corrected Mr. Shaw's errors on all the precise grading plans
on file at the City except for the model home precise grading plan. He allegedly testified that he gave the builder a
revised precise grading plan with a second drainage line but there isn't one on file with the City, to my knowledge.
From: Ray Stockstill [mailto:scnbeach@earthlink.net]
Sent: Thursday, October 24, 2019 8:34 PM
To: 'A] Ortega'
Cc: 'Bryan McKinney'; 'Amy Yu'
Subject: RE: the basis for the senior PE, QSD/P's inclusion of freeboard
3. 1 would like to know what the pad elevations were.
4. Please provide the specific code(s).
S. Please provide the specific code(s). I have never seen a code allowing flexible conduit for storm water drain lines. I've
only seen PVC pipe.
I have two Federal complaints pending and this information is possibly relevant. Whether it is or isn't, I'll be forwarding
it to the FBI so please make sure that you are accurate in what you claim.
Thanks
From: AJ Ortega [mailto:Aortega laquintaca.gov]
Sent: Thursday, October 24, 2019 7:50 PM
To: Ray Stockstill
Cc: Bryan McKinney; Amy Yu
Subject: RE: the basis for the senior PE, QSD/P's inclusion of freeboard
Mr. Stockstill,
3. Yes, as confirmed with Amy.
4. We don't issue a permit specifically for drilling, so if that is the method you choose in performing the
installation of the drain pipe it would be at your discretion.
5. Storm drainage material uses is pretty open, its stated that pipe, tube, and fittings conveying rainwater
shall be of such materials and design as to perform their intended function to the satisfaction of the
Authority Having Jurisdiction — We would accept some type of flexible conduit, such as those approved for
underground use, but the overall installation would still otherwise need to comply with the requirements of
the plumbing code.
Hopefully this helps, part of the delay in my response has been the confusion with the various emails and
multiple recipients, sorry for that.
AJ
From: Ray Stockstill <scnbeach @earth link.net>
Sent: Wednesday, October 23, 2019 10:01 AM
To: AJ Ortega <Aortega@laguintaca.gov>; Amy Yu <Avu@laquintaca.gov>
Subject: FW: the basis for the senior PE, QSD/P's inclusion of freeboard
EXTERNAL: This message originated outside of the City of La Quinta. Please use proper judgement and caution when opening
attachments, clicking links or responding to requests for information.
AJ/Amy - I trust that you are working on the answers to the below 3 questions (#3, 4 & 5). Thanks. Ray
From: Bryan McKinney[maiIto: BmckinneyCa)lag uintaca.gov]
Sent: Tuesday, October 15, 2019 1:24 PM
To: Ray Stockstill; Amy Yu
Cc: AJ Ortega
Subject: RE: the basis for the senior PE, QSD/P's inclusion of freeboard
Mr. Stockstill,
In response to your questions below:
1. The pad elevation is the final graded earth elevation on which your slab rests.
2. 1 am not saying your pad elevation was determined by the top of curb, just that we have to determine it that
way when there is no 100-year water surface. In the case of your house, there was a 100-year water surface
based on the level of water in the site retention basin as Amy sent to you previously. Your house was well
above the one foot minimum.
3. For housing developments, the developer is required to have their surveyor verify pad elevations prior to
issuance of building permits. Amy or AJ should have a copy of this.
4. 1 will defer this to AJ —the question being deferred -Willa permit to do horizontal drilling under my home be
required? If yes, what is the likelihood that the City will approve the drilling? I ask because I don't want to spend
the engineering dollars on a remedy if the City isn't going to approve it.
5. 1 will defer this to AJ and Amy to answer. —the question being deferred -Will the City approve flexible conduit
in place of PVC for an additional drainage system in my courtyard? I ask because I don't want to incur the
engineering expense on a remedy if the City isn't going to approve it.
Thank you,
Bryan McKinney, P.E. I City Engineer
City of La Quinta
78495 Calle Tampico - La Quinta, CA 92253
760.777.7045
Email: bmckinney@laquintaca.gov
Website: www.la-quinta.orci
From: Ray Stockstill <scnbeach @earthlink.net>
Sent: Tuesday, October 15, 2019 7:02 AM
To: Bryan McKinney <Bmckinnev@laquintaca.gov>; Amy Yu <Avu@laguintaca.eov>
Cc: AJ Ortega <Aorteea@laquintaca.gov>
Subject: RE: the basis for the senior PE, QSD/P's inclusion of freeboard
EXTERNAL: This message originated outside of the City of La Quinta. Please use proper judgement and caution when opening
attachments, clicking links or responding to requests for information.
Bryan,
Thank you for responding.
You nor I have any proof of how much it rained in my courtyard on September 8, 2014. We have no proof of
when the rain started or stopped and we have no proof of how much it rained in any 60-minute interval.
Nobody does. You described the event that your office was in on September 8, 2014, which is 7 miles from my
home. Sayings some places saw in excess of 500-year storm isn't proof of anything. A 500 year storm would
have left a debris line in my front yard and there wasn't one.
My issue has never been with your review process. I contacted FEMA shortly after the event and they said the
drain caused the problem and not the weather. The home would have been flooded in less than a 100-year
storm because the drain grate was too small. Before hiring a PE, QSD/P I submitted information to the IAPMO
review committee asking if the drain grate was too small. Additional rain (beyond the initial 0.5" of rain fall)
entering the home wouldn't have mattered. The damage would have already been done before a 100-year
storm had fully occurred even if the drain grate wasn't blocked.
I do appreciate you answering one of my questions. I have some additional questions I'd like answered.
6. My slab is a continuous pour post tension slab. The footers and the slab are poured at the same time.
The depth of the foundation in the front of the home is estimated to be 24" below the finished floor.
Where is the pad elevation that freeboard is measured from in my front yard.
7. Are you saying that there was no flood elevation cross section provided to determine the freeboard
above the street out in front of any of the homes? It sounds like you chose to measure from the curb
because the engineer didn't provide a flood elevation for the street, is that correct?
8. As part of your as -built inspections of each home, do you check as -designed elevations with as -built
evaluations? If yes, can I get a copy for lot 13?
9. Will a permit to do horizontal drilling under my home be required? If yes, what is the likelihood that the
City will approve the drilling? I ask because I don't want to spend the engineering dollars on a remedy if
the City isn't going to approve it.
10. Will the City approve flexible conduit in place of PVC for an additional drainage system in my
courtyard? I ask because I don't want to incur the engineering expense on a remedy if the City isn't
going to approve it.
Thanks and I look forward to your responses. Feel free to call if my questions aren't clear.
Ray Stockstill
949-622-0232
From: Bryan McKinney[maiIto: BmckinneyCa)lag uintaca.gov]
Sent: Tuesday, October 15, 2019 11:13 AM
To: Ray Stockstill; Amy Yu
Cc: AJ Ortega
Subject: RE: the basis for the senior PE, QSD/P's inclusion of freeboard
Good Morning Mr. Stockstill,
The freeboard requirements we require as part of our engineering review are only meant to insure that the building pad
is at least one foot above the 100 year water surface elevation. In many cases, since the exact 100-year water surface
may not be known, we require the pad to be one foot above the top of curb height of the adjacent street curb. We also
check to make sure the lot has positive drainage flow towards the street. Freeboard is not a design requirement for
interior architectural design elements and the drainage capacity of an interior courtyard would not be checked as part of
our plan review.
I would also like to point out that even if your courtyard were designed to accommodate the rainfall from a 100-year
storm, the storm we saw in 2014 was in some places in excess of a 500-year storm and may still have overwhelmed your
drains. I hope this information helps you.
Sincerely,
Bryan McKinney, P.E. I City Engineer
City of La Quinta
78495 Calle Tampico - La Quinta, CA 92253
760.777.7045
Email: bmckinneyOlaquintaca.aov
Website: www.la-quinta.orci
From: Ray Stockstill <scnbeach @earthlink.net>
Sent: Tuesday, October 15, 2019 2:56 AM
To: Amy Yu <Avu@laquintaca.gov>; Bryan McKinney <Bmckinnev@laquintaca.gov>
Cc: AJ Ortega <Aortega@laquintaca.gov>
Subject: RE: the basis for the senior PE, QSD/P's inclusion of freeboard
EXTERNAL: This message originated outside of the City of La Quinta. Please use proper judgement and caution when opening
attachments, clicking links or responding to requests for information.
Is it Brian McKinney or Brian Kinney? When I got Brian's voicemail, it sounded like Brian McKinney - City
Engineer.
When can I expect a response regarding whether freeboard is or is not a design criteria for my interior
courtyard? Thanks. Ray
From: Ray Stockstill [mailto:scnbeach@earthlink.net]
Sent: Sunday, October 13, 2019 9:17 AM
To: ayu(�blaquintaca.gov
Cc: aortega laquintaca.gov
Subject: the basis for the senior PE, QSD/P's inclusion of freeboard
I hired a senior PE, QSD/P in 2016 to review the as -designed and as -built drainage in the courtyard. Here are
some extracts from his report.
"I spoke with Mr. Brian Kinney, an Engineer in the Public Works Department for the City of La Quinta. Mr.
Kinney stated that reasonable engineering practices should be followed for single family residences. Mr.
Kinney continued to state that NOAA data is used in the City, and Rational Method Hydrology preformed using
Riverside County Standards is acceptable to the City. Mr. Kinney's phone number is 760-777-7045.
Industry Standards and the Riverside County Flood Control requires a sump inlet be sized to convey the 100-
Year Storm Event.
As previously stated, the Stockstill Residence has a Courtyard at the center of the house that is closed off. A
typical residential courtyard has one side open as that rainwater that cannot be intercepted by a drain will flow
overland to the street before ponding high enough to damage the residence.
Since the courtyard of the residence is closed off on all sides, water seeks to travel to the lowest point
possible, which is referred to as a sump. The sump, or low point of the courtyard is the grate near the center of
the courtyard. Rainwater will travel through the grate, into an underground pipe, and then into the street, but
when rainwater runoff exceeds the capacity of the grate, rainwater runoff ponds in the courtyard until enough
pressure builds over the inlet to push the water through the inlet opening.
A sump condition requires a secondary outlet for the rainwater to travel. This secondary outlet is sometimes
referred to as a secondary overflow, or a redundant system. The secondary overflow is sized to convey the
minimum rainwater runoff flow, and is used when the primary system does not properly function. In my
professional opinion, design of the redundant system for a closed off courtyard is a minimum standard of
practice. The City of La Quinta Public Works Storm Drain Plan Review Checklist states a secondary path of
travel is needed in a sump condition. Secondary overflow is required by the Riverside County Transportation
Department and the Riverside County Flood Control and Water Conservation District, as well.
Based on the Orifice Equation, the grate does not meet the minimum industry standards and is a negligent
design. Water would have to pond 7.33 feet to generate sufficient pressure to drain the minimum design storm
flows of 1.43 inches per hour.
There is no freeboard between minimum design storm water and finished floor; in fact, the minimum design
storm water is above the finished floor elevation. This does not meet the minimum standards for the As -Built or
As -Design Conditions.
a. There are no calculations supporting the sizing of the drain system, either on the plans or provided as a
separate report.
b. Any time it rains more than 0.355 inches per hour, water will flood the residence.
c. Design of the Stockstill Residence does not comply with the City of La Quinta Engineering Bulletin 06-
16. The City Bulletin states the Designer is to meet all criteria on the Storm Drain Plan Review
Checklist, specifically to provide 1 foot of freeboard above the 100-year surface elevation to the building
pads and to provide calculations and sections to show freeboard is met. The pad is the elevation of the
ground the concrete slab foundation of the house sits on."
Mr. Kinney with the City said to use the Rational Method Hydrology, which is Q = CIA
Q = Peak Discharge
C = Coefficient of Runoff (% of rainwater being absorbed by the type of surface it is landing on)
I = Rainfall Intensity (inches per hour)
A = Tributary Area (in my case the roofs and the opening above the courtyard)
Based on Mr. Kinney's input, the design criteria for the courtyard includes a 1 hour 100-year storm that was
used by the senior PE, QSD/P.
According to the City's Engineering Bulletin #06-16 the "street section should provide adjacent pad elevations
a minimum one foot (1') of freeboard above the 100-year 24 hour storm as shown on Plate A-2 of the RCFC
hydrology Manual." The senior PE, QSD/P did not use a 24 hour 100-year storm as a design criteria for the
courtyard.
According to the City's Engineering Bulletin #06-16 the Rational Method does not apply to retention basins.
The City Bulletin states the Designer is to meet all criteria on the Storm Drain Plan Review Checklist,
specifically to provide 1 foot of freeboard above the 100-year surface elevation to the building pads and to
provide calculations and sections to show freeboard is met. The senior PE, QSD/P included a 1 foot of
freeboard above the 1 hour 100-year storm surface elevation to the building pads as called for in the City's
Storm Drain Review Checklist.
Engineering Bulletin #06-16 — https://www.laguintaca.gov/home/showdocument?id=27107
SUBJECT: Hydrology and Hydraulic Report Criteria for Storm Drain Systems
This engineering bulletin establishes storm drain design specifications. All hydrology/hydraulic reports and
plans for the City of La Quinta should follow the general guidelines set forth by Riverside County Flood Control
and Water Conservation District's (RCFC) Hydrology Manual, Engineering Bulletins #06-15 and #06-16,
Whitewater River Watershed MS4 Permit and the City Storm Drain Plancheck Checklist. Hydrology studies for
the City of La Quinta shall be performed for projects when required by the conditions of approval or as
requested by the City Engineer.
4. Hydraulic Report Guidelines — Last sentence of the paragraph reads "In particular, street section should
provide adjacent pad elevations a minimum one foot (1') of freeboard above the 100-year 24 hour storm as
shown on Plate A-2 of the RCFC hydrology Manual (Attachment B).
Precise Grading Plan Checklist - https://www.laguintaca.gov/home/showdocument?id=23854
PAD & FINISHED FLOOR ELEVATIONS/BUILDING/FLOOD CONTROL MEASURES
10
o Ensure conformance with 2013 CBC 2304.11.2.2 specification for 8 inch offset from pad to untreated wood.
An 8 inch slab thickness or equal is now required.
o Show pad elevations or dirt elevations to the nearest 0.1 ft. Show finished floor or "hard" surface elevations
to the nearest 0.01 ft. Show finished pad and floor elevations of adjacent properties and provide note if
adjacent site is vacant.
o Pad elevation shall be a minimum of 1 ft above 100 year flood elevation. 100 year flood elevation is generally
considered to be at the R/W — FOR should confirm same. FEMA minimum is that the finished floor elevation
shall be a minimum of 1 ft above 100 year flood elevation.
STORM DRAINS/GENERAL DRAINAGE - SEE PUBLIC WORKS STORM DRAIN CHECKLIST FOR
ADDITIONAL REQUIREMENTS
o Concentrated flows shall be conveyed on PCC surfaces.
o Show roof drains with both vertical and horizontal locations. Show connection locations to any hard surface
or underground system. The roof emergency overflow drains must be on independent lines per the CBC.
o Details of any on site drainage structures, walls, surface protection, etc., shall be shown on the plans.
o No drainage over retaining walls and sidewalks. Use concrete "trapezoidal" ditches, area drains, down drains
or other approved drainage design.
o Show ribbon gutters, catch basins and buried drain lines. Provide storm drain detail sheet as applicable
showing plan & profile (including WSE100 & HGL) views of primary storm drain systems. Show invert
elevations for all catch basin and area drain locations. Call out WSE100 for all retention basins.
o No flow crossing property line. o Provide Continuous Deflection Separation unit or equal for golf cart wash
down or equal nuisance flow.
o Specify drain inlet sizes, PVC schedules and sizes and slopes for area drain lines. Show the centerline on
layout and provide a 6 inch minimum line size stub in to RCP primary drain. Maximum HDPE bend/elbow size
is 11.25 degrees for storm drains 12 inches or larger to provide equivalent curvilinear pipe.
o Utilize appropriate drainage systems for application — e.g. ribbon gutters for small flows, gunnite trapezoidal
ditches for large swales by buildings.
o Check number of drywells against nuisance flow or retention basin draw down calculations. See City
Engineering Bulletin 06-16. Drywells are specified at the La Quinta Village area as a standard nuisance flow
device for all parcels. T Drive\Development Services Division\Development Engineering Handbook\Seventh
Edition DEH\checklists 03-25-15 SHEET 5 OF 6
o Confirm adequate surface overflow route for sump inlets in case inlet is blocked.
o Storm drain standards in City Storm Drain Plan Review Checklist have been followed, as applicable.
Storm Drain Plan Review Checklist - https://www.laquintaca.gov/home/showdocument?id=24319
HYDROLOGY & HYDRAULICS REPORT - GENERAL
o Use the Rational Method for inlet flow rates, pipe sizing and utilize the Synthetic Unit Hydrograph for
retention volume. Check drainage boundary areas and ensure inclusion of tributary street and other offsite
areas. Make sure hydrology map is complete and accurate.
o Utilize most current NOAA data (see Public Works Website Engineering Bulletins 06-15, 06-16) for storm
flow assumptions. Identify historical flow paths.
o Provide 1 ft freeboard above 100 year water surface elevation to building pads including a surface overflow
route or provide 500 year storm analysis. Provide calculations/sections (as required) to show that required
freeboard is met.
HYDROLOGY & HYDRAULICS REPORT - INLETS AND INLET CALCULATIONS
o Check capacity and HGL for all drainage structures. o Check capacities of flow -by and sump inlets. Position
inlets PRIOR to flow turns. Flow in the street will not overtop curbs or R/W during changes in direction of the
open channel conduit (typically the street). Inlets will be required at locations on arterial streets prior to the flow
crossing at intersections and major driveways or entrances.
o Sump catch basins and connector drains to be designed for 100 year design storm. Sump conditions require
a secondary overland free flow to prevent flooding of buildings should the catch basin or drain system become
11
plugged. Utilization of flanked inlets in lieu of secondary overland flow is subject to City Engineer review and
approval.
Amy, I would like to know if my PE, QSD/P was correct in choosing the design criteria for the courtyard.
Specifically, is freeboard called for or is it unnecessary in your opinion? Thanks
Ray Stockstill
NOTICE: This email message and any attachments hereto may contain confidential information. Any
unauthorized review, use, disclosure, or distribution of such information is prohibited. If you are not the
intended recipient, please contact the sender by reply email and destroy the original message and all copies of it.
12
CHAPTER 11
STORM DRAINAGE
1101.0 General.
1101.1 Applicability. This chapter shall govern the mate-
rials, design, and installation of storm water drainage
systems.
ii 1101.2 Where Required. Roofs, paved areas, yards, courts,
courtyards, vent shafts, light wells, or similar areas having
rainwater, shall be drained into a separate storm sewer
system, or into a combined sewer system where a separate
storm sewer system is not available, or to some other place
of disposal satisfactory to the Authority Having Jurisdic-
tion. In the case of one- and two-family dwellings, storm
water shall be permitted to be discharged on flat areas, such
as streets or lawns, so long as the storm water shall flow
away from the building and away from adjoining property,
and shall not create a nuisance.
ii 1101.3 Storm Water Drainage to Sanitary Sewer
Prohibited. Storm water shall not be drained into sewers
intended for sanitary drainage.
>) 1101.4 Material Uses. Pipe, tube, and fittings conveying
rainwater shall be of such materials and design as to
perform their intended function to the satisfaction of the
Authority Having Jurisdiction. Conductors within a vent or
j shaft shall be of cast-iron, galvanized steel, wrought iron,
copper, copper alloy, lead, Schedule 40 ABS DWV,
Schedule 40 PVC DWV, stainless steel 304 or 316L [stain-
less steel 304 pipe and fittings shall not be installed under-
ground and shall be kept not less than 6 inches (152 mm)
aboveground], or other approved materials, and changes in
direction shall be in accordance with the requirements of
Section 706.0. ABS and PVC DWV piping installations
IIshall be installed in accordance with this code, and the
California Building Code. Except for individual single-
family dwelling units, materials exposed within ducts or
plenums shall have a flame -spread index of not more than
25 and a smoke developed index of not more than 50,
where tested in accordance with ASTM E84 or UL 723.
[HCD 1 & HCD 21 ABS or PVC installations are limited to
} not more than two stories of areas of residential accommo-
dation.
[OSHPD 1, 2, 3, & 41 ABS and PVC installations are not
allowed.
I 1101.4.1 Copper and Copper Alloys. Joints and
connections in copper and copper alloy pipe and tube
shall be installed in accordance with Section 705.3.
1101.4.2 Conductors. Conductors installed above-
ground in buildings shall be in accordance with the
applicable standards referenced in Table 701.2 for
aboveground drain, waste, and vent pipe. Conductors
installed aboveground level shall be of seamless copper
water tube, Type K, L, or M; Schedule 40 copper pipe
or Schedule 40 copper alloy pipe; Type DWV copper
drainage tube; service weight cast-iron soil pipe or
hubless cast-iron soil pipe; standard weight galvanized
steel pipe; stainless steel 304 or 316L [stainless steel
304 pipe and fittings shall not be installed underground
and shall be kept not less than 6 inches (152 mm)
aboveground]; or Schedule 40 ABS or Schedule 40
PVC plastic pipe.
1101.4.2.1 [HCD 11 ABS or PVC installations are
limited to not more than two stories of areas of
residential accommodation.
1101.4.2.2 [OSHPD 1, 2, 3 & 4] ABS and PVC
installations are not allowed.
1101.4.3 Leaders. Leaders installed outside shall be in <<
accordance with the applicable standards referenced in
Table 701.2 for aboveground drain, waste, and vent
pipe; aluminum sheet metal; galvanized steel sheet
metal; or copper sheet metal.
1101.4.4 Underground Building Storm Drains. <<
Underground building storm drains shall comply with
the applicable standards referenced in Table 701.2 for
underground drain, waste, and vent pipe.
1101.4.5 Building Storm Sewers. Building storm <<
sewers shall comply with the applicable standards
referenced in Table 701.2 for building sewer pipe.
1101.4.6 Subsoil Drains. Subsoil drains shall be open <<
jointed, perforated, or both and constructed of materials
in accordance with Table 1101.4.6.
TABLE 1101.4.6 <<
MATERIALS FOR SUBSOIL DRAIN PIPE AND FITTINGS
MATERIAL
REFERENCED STANDARD(S)
PE
ASTM F405
PVC
ASTM D2729
Vitrified Clay (Extra strength)
ASTM C4, ASTM C700
1101.5 Expansion Joints Required. Expansion joints or <<
sleeves shall be provided where warranted by temperature
variations or physical conditions.
1101.6 Subsoil Drains. Subsoil drains shall be provided <<
around the perimeter of buildings having basements,
cellars, crawl spaces, or floors below grade. Such subsoil
drains shall be permitted to be positioned inside or outside
of the footing, shall be of perforated or open -jointed
approved drain tile or pipe, not less than 3 inches (80 mm)
in diameter, and shall be laid in gravel, slag, crushed rock,
approved 3/4 of an inch (19.1 mm) crushed, recycled glass
aggregate, or other approved porous material with not less
than 4 inches (102 mm) surrounding the pipe. Filter media
shall be provided for exterior subsoil piping.
Exception: [HCD I & HCD 4 Subsoil drains are manda-
tory only when required by the Authority Having Jurisdic-
tion due to geological conditions.
1101.6.1 Discharge. Subsoil drains shall be piped to a "
storm drain, to an approved water course, to the front
2016 CALIFORNIA PLUMBING CODE 209
STORM DRAINAGE
street curb or gutter, to an alley, or the discharge from
Areaways in excess of 100 square feet (9.29 mZ) shall not M
the subsoil drains shall be conveyed to the alley by a
drain into subsoil drains. Areaway drains for areaways
concrete gutter. Where a continuously flowing spring
exceeding 100 square feet (9.29 mZ) shall be sized in accor-
or groundwater is encountered, subsoil drains shall be
dance with Table 1101.8.
piped to a storm drain or an approved water course.
1101.9 Window Areaway Drains. Window areaways at a <<
1101.6.2 Sump. Where it is not possible to convey the
maximum of 10 square feet (0.93 mz) in area shall be
drainage by gravity, subsoil drains shall discharge to an
permitted to discharge to the subsoil drains through a 2 inch
accessible sump provided with an approved automatic
(50 mm) pipe. However, window areaways exceeding 10
electric pump. The sump shall be not less than 15
square feet (0.93 ml) in area shall be handled in the manner
inches (381 mm) in diameter, 18 inches (457 mm) in
provided for entrance areaways (see Section 1101.8).
depth, and provided with a fitted cover. The sump
pump shall have an adequate capacity to discharge
1101.10 Filling Stations and Motor Vehicle Washing <<
water coming into the sump as it accumulates to the
Establishments. Public filling stations and motor vehicle
required discharge point, and the capacity of the pump
washing establishments shall have the paved area sloped
shall be not less than 15 gallons per minute (gpm) (0.95
toward sumps or gratings within the property lines. Curbs
L/s). The discharge piping from the sump pump shall
not less than 6 inches (152 mm) high shall be placed where
be not less than 11/2 inches (40 mm) in diameter and
required to direct water to gratings or sumps.
have a union or other approved quick -disconnect
1101.11 Paved Areas. Where the occupant creates surface <<
assembly to make the pump accessible for servicing.
water drainage, the sumps, gratings, or floor drains shall be
1101.6.3 Splash Blocks. For separate dwellings not
piped to a storm drain or an approved water course.
serving continuously flowing springs or groundwater,
1101.12 Roof Drainage. Roof drainage shall comply with <<
the the sump discharge pipe shall be permitted to discharge
Section 1101.12.1 and Section 1101.12.2.
onto a concrete splash block with a minimum length of
1101.12.1 Primary Roof Drainage. Roof areas of a ��
24 inches (610 mm). This pipe shall be within 4 inches
(102 mm) of the splash block and positioned to direct
building shall be drained by roof drains or gutters. The
the flow parallel to the recessed line of the splash
location and sizing of drains and gutters shall be coor-
block.
dinated with the structural design and pitch of the roof.
1101.6.4 Backwater Valve. Subsoil drains subject to
Unless otherwise required by the Authority Having }
backflow where discharging into a storm drain shall be
Jurisdiction, roof drains, gutters, vertical conductors or
provided with a backwater valve in the drain line so
leaders, and horizontal storm drains for primary
located as to be accessible for inspection and mainte-
drainage shall be sized based on a storm of 60 minutes
nance.
duration and 100 year return period. Refer to Table D
1101.6.5 Open Area. Nothing in Section 1101.6 shall
10 1. 1 (in Appendix D) for 100 year, 60 minute storms
prevent drains that serve either subsoil drains or
at various locations.
areaways of a detached building from discharging to a
1101.12.2 Secondary Drainage. Secondary (emer- <<
properly graded open area, provided that:
gency) roof drainage shall be provided by one of the
(1) They do not serve continuously flowing springs or
methods specified in Section 1101.12.2.1 or Section
groundwater.
1101.12.2.2.
(2) The point of discharge is not less than 10 feet
1101.12.2.1 Roof Scuppers or Open Side. <<
(3048 mm) from a property line.
Secondary roof drainage shall be provided by an
(3) It is impracticable to discharge such drains to a
open -sided roof or scuppers where the roof
storm drain, to an approved water course, to the
perimeter construction extends above the roof in
front street curb or gutter, or to an alley.
such a manner that water will be entrapped. An
ii 1101.7 Building Subdrains. Building subdrains located
open -sided roof or scuppers shall be sized to
below the public sewer level shall discharge into a sump or
prevent the depth of ponding water from
exceeding that for which the roof was designed as
receiving tank, the contents of which shall be automatically
lifted and discharged into the drainage system as required
determined by Section 1101.12.1. Scupper open -
for building sumps.
ings shall be not less than 4 inches (102 mm) high
i% 1101.8 Areaway Drains. Open subsurface space adjacent
and have a width equal to the circumference of the
to a building, serving as an entrance to the basement or
roof drain required for the area served, sized in
cellar of a building, shall be provided with a drain or drains.
accordance with Table 1101.12.
Such areaway drains shall be not less than 2 inches (50
1101.12.2.2 Secondary Roof Drain. Secondary <<
mm) in diameter for areaways at a maximum of 100 square
roof drains shall be provided. The secondary roof
feet (9.29 m2) in area, and shall be discharged in the manner
drains shall be located not less than 2 inches (51
provided for subsoil drains not serving continuously
mm) above the roof surface. The maximum
flowing springs or groundwater (see Section 1101.6.1).
height of the roof drains shall be a height to
210 2016 CALIFORNIA PLUMBING CODE
STORM DRAINAGE
prevent the depth of ponding water from
1101.15.3 Method of Installation of Combined
exceeding that for which the roof was designed as
Sewer. Individual storm -water traps shall be installed
determined by Section 1101.12.1. The secondary
on the stormwater drain branch serving each storm -
roof drains shall connect to a piping system in
water inlet, or a single trap shall be installed in the
accordance with Section 1101.12.2.2.1 or Section
main storm drain just before its connection with the
1101.12.2.2.2.
combined building sewer. Such traps shall be provided
1101.12.2.2.1 Separate Piping System. The
with an accessible cleanout on the outlet side of the trap.
secondary roof drainage system shall be a
1101.16 Leaders, Conductors, and Connections. Leaders <<
separate system of piping, independent of the
or conductors shall not be used as soil, waste, or vent pipes
primary roof drainage system. The discharge
nor shall soil, waste, or vent pipes be used as leaders or
shall be above grade, in a location observable
conductors.
by the building occupants or maintenance
personnel. Secondary roof drain systems shall
1101.16.1 Protection of Leaders. Leaders installed <<
be sized in accordance with Section 1101.12.1
along alleyways, driveways, or other locations where
based on the rainfall rate for which the
exposed to damage shall be protected by metal guards,
primary system is sized.
recessed into the wall, or constructed from ferrous pipe.
1101.12.2.2.2 Combined System. The
1101.16.2 Combining Storm with Sanitary <<
secondary roof drains shall connect to the
Drainage. The sanitary and storm drainage system of a
vertical piping of the primary storm drainage
building shall be entirely separate, except where a
conductor downstream of the last horizontal
combined sewer is used, in which case the building
1 offset located below the roof. The primary
storm drain shall be connected in the same horizontal
storm drainage system shall connect to the
plane through a single wye fitting to the combined
building storm water that connects to an
building sewer not less than 10 feet (3048 mm) down -
underground public storm sewer. The
stream from a soil stack.
combined secondary and primary roof drain
systems shall be sized in accordance with
1102.0 Roof Drains. <<
Section 1103.0 based on double the rainfall
rate for the local area.
1102.1 Applications. Roof drains shall be constructed of
ii 1101.13 Cleanouts. Cleanouts for building storm drains
aluminum, cast-iron, copper alloy of not more than 15
shall comply with the requirements of Section 719.0 of this
Percent zinc, leaded nickel bronze, stainless steel, ABS,
code.
PVC, polypropylene, polyethylene, or nylon and shall
ii 1101.13.1 Rain Leaders and Conductors. Rain
comply with ASME Al 12.3.1 or ASME Al 12.6.4.
1102.2 Dome Strainers Required. Roof drains shall have
�
leaders and conductors connected to a building storm
sewer shall have a cleanout installed at the base of the
domed strainers.
outside leader or outside conductor before it connects
Exception: Roof drain strainers for use on sun decks,
to the horizontal drain.
parking decks, and similar areas that are normally serviced
ii 1101.14 Rainwater Sumps. Rainwater sumps serving
and maintained, shall be permitted to be of the flat surface
"public use" occupancy buildings shall be provided with
type. Such roof drain strainers shall be level with the deck.
dual pumps arranged to function alternately in case of over-
t
1102.3 Roof Drain Flashings. Connection between the <{
load or mechanical failure. Pumps rated 600 V or less shall
roof and roof drains that pass through the roof and into the
comply with UL 778 and shall be installed in accordance
interior of the building shall be made watertight by the use
with the manufacturer's installation instructions.
of proper flashing material.
ii 1101.15 Traps on Storm Drains and Leaders. Leaders
1102.3.1 Lead Flashing. Where lead flashing material <<
and storm drains, where connected to a combined sewer,
is used, it shall be not less than 4 pounds per square
shall be trapped. Floor and area drains connected to a storm
foot (lb/ft2) (19 kg/m2).
drain shall be trapped.
1102.3.2 Copper Flashing. Where copper flashing <<
Exception: Traps shall not be required where roof drains,
material is used, it shall be not less than 12 ounces per
rain leaders, and other inlets are at locations allowed under
square foot (oz/ft2) (3.7 kg/m2).
Section 906.0, Vent Termination.
ii 1101.15.1 Where Not Required. No trap shall be
required for leaders or conductors that are connected to
1103.0 Size of Leaders, Conductors, and Storm <<
a sewer carrying storm water exclusively.
%i 1101.15.2 Trap Size. Traps, where installed for indi-
Drains.
1103.1 Vertical Conductors and Leaders. Vertical <<
vidual conductors, shall be the same size as the hori-
conductors and leaders shall be sized on the basis of the
zontal drain to which they are connected.
maximum projected roof area and Table 1101.12.
2016 CALIFORNIA PLUMBING CODE
211
STORM DRAINAGE
ii 1103.2 Size of Horizontal Storm Drains and
Sewers. The size of building storm drains or building
storm sewers or their horizontal branches shall be based
upon the maximum projected roof or paved area to be
handled and Table 1101.8.
ii 1103.3 Size of Roof Gutters. The size of semi -circular
gutters shall be based on the maximum projected roof area
and Table 1103.3.
ii 1103.4 Side Walls Draining onto a Roof. Where vertical
walls project above a roof so as to permit storm water to
drain to the roof area below, the adjacent roof area shall
be permitted to be computed from Table I101.12 as
follows:
(1) For one wall — add 50 percent of the wall area to the
roof area figures.
(2) For two adjacent walls of equal height — add 35 percent
of the total wall areas.
(3) For two adjacent walls of unequal height — add 35
percent of the total common height and add 50 percent
of the remaining height of the highest wall.
(4) Two opposite walls of same height — add no additional
area.
(5) Two opposite walls of differing heights — add 50
percent of the wall area above the top of lower wall.
(6) Walls on three sides — add 50 percent of the area of the
inner wall below the top of the lowest wall, plus
allowance for the area of the wall above the top of the
lowest wall, in accordance with Section 1103.4(3) and
Section 1103.4(5) above.
(7) Walls on four sides — no allowance for wall areas
below the top of the lowest wall — add for areas above
the top of the lowest wall in accordance with Section
1103.4(1), Section 1103.4(3), Section 1103.4(5), and
Section 1103.4(6) above.
ii 1104.0 Values for Continuous Flow.
ii 1104.1 General. Where there is a continuous or semi -
continuous discharge into the building storm drain or
building storm sewer, as from a pump, ejector, air-condi-
tioning plant, or similar device, 1 gpm (0.06 L/s) of such
discharge shall be computed as being equivalent to 24
square feet (2.2 m2) of roof area, based upon a rate of rain-
fall of 4 inches per hour (in/h) (102 mm/h).
ii 1105.0 Controlled -Flow Roof Drainage.
ii 1105.1 Application. In lieu of sizing the storm drainage
system in accordance with Section 1103.0, the roof
drainage shall be permitted to be sized on the basis of
controlled flow and storage of the storm water on the roof,
provided the following conditions are met:
(1) The water from a 25 year -frequency storm shall not be
stored on the roof exceeding 24 hours.
(2) During the storm, the water depth on the roof shall not
exceed the depths specified in Table 1105.1(1).
(3) Not less than two drains shall be installed in roof areas
of 10 000 square feet (929 m2) or less, and not less than
one additional drain shall be installed for each 10 000
square feet (929 m2) of roof area exceeding 10 000
square feet (929 m2).
(4) Each roof drain shall have a precalibrated, fixed
(nonadjustable), and proportional weir (notched) in a
standing water collar inside the strainer. No mechanical
devices or valves shall be allowed.
(5) Pipe sizing shall be based on the pre -calibrated rate of
flow (gpm) (L/s) of the pre -calibrated weir for the
maximum allowable water depth, and Table 1101.8 and
Table 1101.12.
(6) The height of stones or other granular material above the
waterproofed surface shall not be considered in water
depth measurement, and the roof surface in the vicinity
of the drain shall not be recessed to create a reservoir.
(7) Roof design, where controlled -flow roof drainage is used,
shall be such that the design roof live load is not less than
30 lb/ft2 (146 kg/m2) to provide a safety factor exceeding
the 15 lb/ft2 (73 kg/m2) represented by the depth of water
stored on the roof in accordance with Table 1105.1(1).
(8) Scuppers shall be provided in parapet walls. The
distance of scupper bottoms above the roof level at the
drains shall not exceed the maximum distances speci-
fied in Table 1105.1(2).
(9) Scupper openings shall be not less than 4 inches (102
min) high and have a width equal to the circumference
of the roof drain required for the area served, sized in
accordance with Table 1101.12.
(10) Flashings shall extend above the top of the scuppers.
(11) At a wall or parapet, 45 degree (0.79 rad) cants shall be
installed.
(12) Separate storm and sanitary drainage systems shall be
provided within the building.
(13) Calculations for the roof drainage system shall be
submitted along with the plans to the Authority Having
Jurisdiction for approval.
TABLE 1105.1(1)
CONTROLLED -FLOW MAXIMUM ROOF WATER DEPTH
ROOF RISE
(inches)
MAXIMUM WATER DEPTH
AT DRAIN
(inches)
Flat
3
2
4
4
5
6
6
For 51 units: l inch = 25.4 mm
* Vertical measurement from the roof surface at the drain to the highest
point of the roof surface served by the drain, ignoring a local depression
immediately adjacent to the drain.
212 2016 CALIFORNIA PLUMBING CODE
STORM DRAINAGE
TABLE 1105.1(2)
DISTANCE OF SCUPPER BOTTOMS ABOVE ROOF
ROOF RISE*
(inches)
AT DRAIN
Flat 3
2 _ 4
4 5
6 6
or i units: 1 inch = 25A mm
* Vertical measurement from the roof surface at the drain to the highest
point of the roof surface served by the drain, ignoring a local depression
immediately adjacent to the drain.
1105.2 Setback Roofs. Drains on setback roofs shall be
permitted to be connected to the controlled -flow drainage
systems provided:
(1) The setback is designed for storing water, or
(2) The square footage of the setback drainage area is
converted as outlined in Section 1105.0 to gpm, and the
storm -water pipe sizes in the controlled -flow system
are based on the sum of the loads.
(3) The branch from each of the roof drains that are not
provided with controlled flow shall be sized in accor-
dance with Table 1101.12.
1106.0 Testing.
)� 1106.1 Testing Required. New building storm drainage
systems and parts of existing systems that have been
altered, extended, or repaired shall be tested in accordance
with Section 1106.2.1 or Section 1106.2.2 to disclose leaks
and defects.
1106.2 Methods of Testing Storm Drainage Systems.
Except for outside leaders and perforated or open jointed
drain tile, the piping of storm drain systems shall be tested
upon completion of the rough piping installation by water
or air, except that plastic pipe shall not be tested with air,
and proved tight. The Authority Having Jurisdiction shall
be permitted to require the removal of cleanout plugs to
ascertain whether the pressure has reached parts of the
system. One of the following test methods shall be used in
accordance with Section 1106.2.1 through Section
1106.2.3.
1106.2.1 Water Test. After piping has been installed,
the water test shall be applied to the drainage system,
either to the entire system or to sections. Where the test
is applied to the entire system, all openings in the
piping shall be tightly closed except for the highest
opening, and the system shall be filled with water to
the point of overflow. Where the system is tested in
sections, each opening shall be tightly plugged except
for the highest opening of the section under test, and
each section shall be filled with water, but no section
shall be tested with less than a 10 foot (3048 mm) head
of water. In testing successive sections, not less than
the upper 10 feet (3048 mm) of the next preceding
section shall be tested so that no joint of pipe in the
building except the uppermost 10 feet (3048 mm) of a
roof drainage system, which shall be filled with water
to the flood level of the uppermost roof drain, shall
have been submitted to a test of less than 10 foot (3048
mm) head of water. The water shall be kept in the
system or in the portion under test for not less than 15
minutes before inspection starts; the system shall then
be tight.
1106.2.2 Air Test. The air test shall be made by
attaching an air compressor testing apparatus to a suit-
able opening after closing other inlets and outlets to the
system, forcing air into the system until there is a
uniform gauge pressure of 5 pounds -force per square
inch (psi) (34 kPa) or sufficient pressure to balance a
column of mercury 10 inches (34 kPa) in height. This
pressure shall be held without introduction of addi-
tional air for a period of not less than 15 minutes.
1106.2.3 Exceptions. Where circumstances exist that <<
make air and water tests described in Section 1106.2.1
and Section 1106.2.2 impractical, see Section 105.3.
2016 CALIFORNIA PLUMBING CODE 213
STORM DRAINAGE
TABLE 1101.8
SIZING OF HORIZONTAL RAINWATER PIPING', 2
SIZE OF PIPE
FLOW
(1/a inch per foot
slope)
MAXIMUM ALLOWABLE HORIZONTAL PROJECTED ROOF AREAS
AT VARIOUS RAINFALL RATES
(square feet)
1 (in/h) 2 (in/h) 3 (in/h) 4 (In/h) 5 (in/h) 6 (In/h)
3288 1644 1096 822 657 548
inches
gpm
3
34
4
78
7520
3760
2506
1880
1504
1253
5
139
13 360
6680
4453
3340
2672
2227
6
222
21 400
10 700
7133
5350
4280
3566
8
478
46 000
23 000
15 330
11 500
9200
7670
10
860
82 800
41 400
27 600
20 700
16 580
13 800
12
1384
133 200
66 600
44 400
33 300
26 650
22 200
15
2473
238 000
119 000
79 333
59 500
47 600 1
39 650
SIZE OF PIPE
FLOW I MAXIMUM ALLOWABLE HORIZONTAL PROJECTED ROOF AREAS
(1/4 inch per foot AT VARIOUS RAINFALL RATES
slope) (square feet)
gpm 1 (in/h) 2 (in/h) 3 (in/h) 4 (in/h) 5 (in/h) 6 (in/h)
inches
3
48
4640
2320
1546
1160
928
773
4
110
10 600
5300
3533
2650
2120
1766
5
196
18 880
9440
6293
4720
3776
3146
6
314
30 200
15 100
10 066
7550
6040
5033
8
677
65 200
32 600
21 733
16 300
13 040
10 866
10
1214
116 800
58 400
38 950
29 200
23 350
19 450
12
1953
188 000
94 000
62 600
47 000
37 600
31 350
15
SIZE OF PIPE
inches
3491
336 000 168 000 j 112 000 84 000 67 250 56 000
MAXIMUM ALLOWABLE HORIZONTAL PROJECTED ROOF AREAS
AT VARIOUS RAINFALL RATES
(square feet)
1 (in/h) 2 (in/h) 3 (in/h) 4 (in/h) 5 (in/h) 6 (in/h)
FLOW
(1/2 inch per foot
slope)
gpm
3
68
6576
3288
2192
1644
1310
1096
4
156
15 040
7520
5010
3760
3010
2500
5
278 1
26 720
13 360
8900
6680
5320
4450
6
445
42 800
21 400
14 267
10 700
8580
7140
8
956
92 000
46 000
30 650
23 000
18 400
15 320
10
1721
165 600
82 800
55 200
41 400
33 150
27 600
12
2768
266 400
133 200
88 800
66 600
53 200
44 400
15
4946
476 000
238 000
158 700
119 000
95 200
79 300
For SI units: 1 inch = 25 mm, 1 gallon per minute = 0.06 L/s, 1/8 inch per foot = 10.4 mm/m, 1 inch per hour = 25.4 mm/h, 1 square foot = 0.0929 m2
Notes:
1 The sizing data for horizontal piping are based on the pipes flowing full.
2 For rainfall rates other than those listed, determine the allowable roof area by dividing the area given in the 1 inch per hour (25.4 mm/h) column by the
desired rainfall rate.
214 2016 CALIFORNIA PLUMBING CODE
STORM DRAINAGE
TABLE 1101.12 0
SIZING ROOF DRAINS, LEADERS, AND VERTICAL RAINWATER PIPING2, 3
SIZE OF
DRAIN,
LEADER,
OR PIPE
FLOW
1 (in/h)
2880
2 (in/h)
1440
3 (in/h)
960
MAXIMUM
4 (in/h)
720
ALLOWABLE
AT VARIOUS
5 (in/h)
575
HORIZONTAL PROJECTED
RAINFALL RATES
(square feet)
6 (in/h) 7 (in/h)
480 410
ROOF
8 (in/h)
360
AREAS
9 (in/h)
320
10 (in/h)
290
11 (in/h)
260
12 (in/h)
240
inches
9Pm1
2
30
3
92
8800
4400
2930
2200
1760
1470
1260
1100
980
880
800
730
4
192
18 400
9200
6130
4600
3680
3070
2630
2300
2045
1840
1675
1530
5
360
34 600
17 300
11 530
8650
6920
5765
4945
4325
3845
3460
3145
2880
6
563
54 000
27 000
17 995
13 500
10 800
9000
7715
6750
6000
5400
4910
4500
8
1208
116 000
58 000
38 660
29 000
23 200
19 315
16 570
14 500
12 T907I
11 600
10 545
9600
For SI units: 1 inch = 25 mm, 1 gallon per minute = 0.06 L/s, 1 inch per hour = 25.4 mm/h, I square foot = 0.0929 triz
Notes:
1 Maximum discharge capacity, gpm (L/s) with approximately 13/4 inch (44 mm) head of water at the drain.
2 For rainfall rates other than those listed, determine the allowable roof area by dividing the area given in the 1 inch per hour (25.4 mm/h) column by the
desired rainfall rate.
3 Vertical piping shall be round, square, or rectangular. Square pipe shall be sized to enclose its equivalent roundpipe. Rectangular pipe shall have not less
than the same cross -sectional area as its equivalent round pipe, except that the ratio of its side dimensions shall not exceed 3 to 1.
2016 CALIFORNIA PLUMBING CODE 215
STORM DRAINAGE
TABLE 1103.3
SIZE OF GUTTERS
DIAMETER OF GUTTER MAXIMUM RAINFALL RATES BASED ON ROOF AREA
(1/16 inch per foot slope) (square feet)
inches 2 (in/h) 3 (in/h) 4 (in/h) 5 (in/h) 6 (in/h)
3 340 226 170 1 136 113
4
720
480
360
288
240
5
1250
834
625
500
416
6
1920
1280
960
768
640
7
2760
1840
1380
1100
918
8
3980
2655
1990
1590
1325
10
7200
4800
3600
2880
2400
DIAMETER OF GUTTER MAXIMUM RAINFALL RATES BASED ON ROOF AREA
('/6 inch per foot slope) (square feet)
inches 2 (in/h) 3 (in/h) 4 (in/h) 5 (in/h) 6 (in/h)
3 480 320 240 192 160
4
1020
681
510
408
340
5
1760
1172
880
704
587
6
2720
1815
1360
1085
905
7
3900
2600
1950
1560
1300
8
5600
3740
2800
2240
1870
10
10 200
6800
5100
4080
3400
DIAMETER OF GUTTER
(1/4 inch per foot slope)
MAXIMUM RAINFALL RATES BASED ON ROOF AREA
(square feet)
2 (in/h) 3 (in/h) 4 (in/h) 5 (in/h) 6 (in/h)
680 454 340 272 226
inches
3
4
1440
960
720
576
480
5
2500
1668
1250
1000
834
6
3840
2560
1920
1536
1280
7
5520
3680
2760
2205
1840
8
7960
5310
3980
3180
2655
10
14 400
9600
7200
5750
4800
DIAMETER OF GUTTER
(1/2 inch per foot slope)
inches
MAXIMUM RAINFALL RATES BASED ON ROOF AREA
(square feet)
2 (in/h) 3 (in/h) 4 (in/h) 5 (in/h) 6 (in/h)
960 640 480 384 320
3
4
2040
1360
1020
816
680
5
3540
2360
1770
1415
1180
6
5540
3695
2770
2220
1850
7
7800
5200
3900
3120
2600
8
11 200
7460
5600
4480
3730
10
20 000
13 330
10 000
8000
6660
For SI units: 1 inch = 25 rum, '/i 6 inch per foot = 5.2 mm/m, 1 inch per hour = 25.4 mm/h, 1 square foot = 0.0929 m`
216
2016 CALIFORNIA PLUMBING CODE
SANITARY DRAINAGE
TABLE 701.2
MATERIALS FOR DRAIN, WASTE, VENT PIPE AND FITTINGS
UNDERGROUND
ABOVEGROUND
BUILDING SEWER
REFERENCED
MATERIAL
DRAIN, WASTE,
DRAIN, WASTE,
PIPE AND
REFERENCED
STANDARD(S)
VENT PIPE AND
VENT PIPE AND
FITTINGS
STANDARD(S) PIPE
FITTINGS
FITTINGS
FITTINGS
ABS (Schedule 40)
ASTM D2661,
ASTM D2661,
X
X
X
ASTM D2680*
ASTM D2680*
Cast -Iron
ASME B16.12,
ASTM A74,
ASTM A74,
X
X
X
ASTM A888,
ASTM A888,
CISPI 301
CISPI 301
Co -Extruded ABS (Schedule
40)
X
X
X
ASTM F628
ASTM D2661,
ASTM D2680*
Co -Extruded
ASTM D2661,
Composite (Schedule 40)
ASTM D2665,
X
X
X
ASTM F1488
ASTM F794*,
ASTM F1866
Co -Extruded PVC (Schedule
40)
ASTM D2665,
X
X
X
ASTM F891
ASTM F794*,
ASTM F1866
Copper and Copper Alloys
ASTM 1343,
(Type DWV)
ASTM B75,
ASME B16.2
X
X
X
ASTM B251,
ASME B 16.29
ASTM B302,
ASTM B306
Galvanized Malleable Iron
—
X
—
—
ASME 1316.3
Galvanized Steel
—
X
—
ASTM A53
—
Polyethylene
—
X
ASTM F714
—
PVC (Schedule 40)
ASTM D1785,
ASTM D2665,
X
X
X
ASTM D2665,
ASTM F794*,
ASTM F794*
ASTM F1866
Stainless Steel 304
—
X
—
ASME A112.3.1
ASME Al 12.3.1
Stainless Steel 316E
X
X
X
ASME A112.3.1
ASME A112.3.1
Vitrified Clay (Extra
strength)
—
—
X
ASTM C700
ASTM C700
'0 For building sewer applications.
J
172 2016 CALIFORNIA PLUMBING CODE