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26769 Lot 12Portion of the North Half of Section 15, Township 6 South, Range 7 East, San Bernardino Base and Meridian LOT 12 - OWENS RESIDENCE mc,EVED December 23, 2015 Prepared for Larry Owens JN: 1684 c�5 MSA CONSULTING, INC. PLANNING ■ CIVIL ENGINEERING s LAND SURVEYING 34200 BOB Hope DRrvE ■ RANCHO MIAGB • CA 92270 TELEPHONE (760) 320-9811 • FAX (760) 323-7893 1'I >I ' )1 ( ) 1' 1\//\1 'l / '111 /l Portion of the North Half of Section 15, Township 6 South, Range 7 East, San Bernardino Base and Meridian LOT 12 - OWENS RESIDENCE mc,EVED December 23, 2015 Prepared for Larry Owens JN: 1684 c�5 MSA CONSULTING, INC. PLANNING ■ CIVIL ENGINEERING s LAND SURVEYING 34200 BOB Hope DRrvE ■ RANCHO MIAGB • CA 92270 TELEPHONE (760) 320-9811 • FAX (760) 323-7893 TRACT NO. 26769 — LOT 12 Hydrology Narrative PROJECT LOCATION The proposed project site is located south of Avenue 54 and west of Monroe Street in the City of La Quinta, California. The site is described as being in a portion of the North'/ of Section 15, Township 6 South, Range 7 East, SBM. A vicinity map obtained from the Riverside TLMA website is included. EXISTING CONDITIONS Flood Rate Map The project area is covered by FIRM Panel Number 06065C2263G, effective August 27, 2008, which indicates, If Panel is not printed, the reason why: NO SPECIAL FLOOD HAZARD AREAS National Cooperative Soil Survey The existing soil is categorized primarily as hydrologic soil group B as shown on the attached National Cooperative Soil Survey exhibit. Pre -Development Topography Topographically, the site is generally flat with a gentle slope to the southeast. Drainage is generally sheet flow to the south and southeast. PROPOSED FLOOD CONTROL REQUIREMENTS Drainage requirements for this project fall under the jurisdiction of the City of La Quinta. The project design shall provide for the capture and storage of all storm runoff generated in the 100 -year storm. Shallow retention basins are proposed along the rear, sides and front of the property that will collect storm run-off. Storm runoff is directed to the basins with sheet flow conveyed to the retention basins through surface drainage. HYDROLOGY ANALYSIS DESIGN CRITERIA Storm run-off volumes for the 100 -year event were obtained utilizing the Synthetic Unit (Shortcut Method) Hydrograph, as described in the RCFC&WCD Hydrology Manual. The shortcut method is useful for evaluating those areas Tess than 200 acres in size. Peak storm flows for the 100 -year and 10 -year events were obtained utilizing the Rational Method, as described in the RCFC&WCD Hydrology Manual. The hydrologic data used for the calculations are as follows: Hydrologic Soil Group Soil Group B is defined by RCFCD as — "those soils having moderate infiltration rates. These soils consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission." Antecedent Moisture Condition AMC II — Moderate runoff potential, an intermediate condition. Per RCFC & WCD Hydrology Manual (Dated: April, 1978): "For the purposes of design hydrology using District methods, AMC II should normally be assumed for both the 10 year and 100 year frequency storm". 1 TRACT NO. 26769 — LOT 12 Hydrology Narrative Land Use Classifications and Runoff Index Numbers Runoff Index Numbers were obtained from RCFCD Plate D-5.5 and are summarized below: Proposed Conditions — Single Family Residential 56 Proposed open space areas as identified from the site plan were assumed to be 10% impervious. Percent of Impervious Cover (RCFCD Plate E-6.3): Buildings/Paving/Hardscape Proposed Landscaping 100% 10% Low Loss Rates 85% Precipitation Frequency Estimates Precipitation depths were obtained from NOAA Atlas 14 2 Year - 1 Hour Precipitation: 100 Year —1 Hour Precipitation: 100 Year — 3 Hour Precipitation: 100 Year - 6 Hour Precipitation 100 Year — 24 Hour Precipitation 0.34 inches 1.36 inches 2.08 inches 2.71 inches 4.35 inches See attached for the NOAA Atlas 14 Point Precipitation Frequency Estimates and respective RCFCD Plates. Site Infiltration For the purposes of this report, a basin percolation factor of 0 inches/hour was used in the calculations. Drainage Area Al This drainage area is a portion represented by a tributary area consisting of 1/3 of the south portion of the property with storm flows being directed to a shallow basin located curb adjacent to Mountain View Lane. PROPOSED LAND USE SUMMARY Land Use Drainage RI Number AMC II Area Infiltration Rate (in/hr) (acres) Impervious Percent Buildings/Paving/Hardscape 0.14 56 0.51 100 Open Space 0.20 56 0.51 10 Total Area 0.34 STORM EVENT SUMMARY — DEVELOPED CONDITION Duration 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR Effective Rain (in) 1.07 1.22 1.23 1.17 Flood Volume (cu -ft) (acre -ft) 1,316 0.03 1,502 0.03 1,513 0.03 1,439 0.03 Peak Flow (cfs) n/a 0.60 0.52 0.12 2 TRACT NO. 26769 — LOT 12 Hydrology Narrative Retention Basin Al Characteristics: ELEVATION (ft) 99 100 299 DEPTH (ft) VOLUME (cu -ft) (acre -ft) 0 1 0 0.00 1,548 0.04 2 2,762 0.06 As illustrated above in the developed condition, retention basin Al provides the capacity to capture 100% of the flood volume from all storm durations. Drainage Area A2 This drainage area is a portion represented by a tributary area consisting of the remainder of the property with storm flows being directed to a shallow basin located at the rear and sides of the property. PROPOSED LAND USE SUMMARY Land Use Drainage Area (acres) RI Number AMC II Infiltration Rate (in/hr) Impervious Percent Buildings/Paving/Hardscape Open Space 0.27 56 0.51 100 Total Area 0.64 56 0.91 0.51 10 STORM EVENT SUMMARY — DEVELOPED CONDITION Duration 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR Effective Rain (in) 1.02 1.09 1.11 1.00 Flood Volume (cu -ft) (acre -ft) 3,364 0.08 3,611 0.08 3,681 0.08 3,317 0.08 Peak Flow (cfs) n/a 1.56 1.36 0.27 Retention Basin A2 Characteristics: ELEVATION (ft) DEPTH (ft) VOLUME (cu -ft) (acre -ft) 100 0 0 0.00 101 1 6,998 0.16 102 2 17,550 0.40 1 As illustrated above in the developed condition, retention basin A2 provides the capacity to capture 100% of the flood volume from all storm durations. RESULTS AND CONCLUSIONS As the above narrative and summaries confirm, the proposed project meets the hydrologic and hydraulic conditions as set forth by the City of La Quinta. 3 TRACT NO. 26769 OWENS RESIDENCE ITh IT 0 472 944 Feet e 'IMPORTANT* Maps and data are to be used for reference purposes only Map features are approximate, and are not necessarily accurate to surveying or engineering standards The County of Riverside makes no warranty or guarantee as to the content (the source is often third party), accuracy, timeliness, or completeness of any of the data provided, and assumes no legal responsibility for the information contained on this map Any use of this product with respect to accuracy and precision shall be the sole responsibility of the user REPORT PRINTED ON 12/7/2015 10:03:04 AM © Riverside County TLMA GIS Legend Display Parcels D- City Boundaries Cities roadsanno highways HVVY INTERCHANGE INTERSTATE OFFRAMP ONRAMP USHVW Ej counties LI cities hydrographylines waterbodies Lakes Rivers World Street Map Notes Precipitation Frequency Data Server r O Page 1 of 4 NOAA Atlas 14, Volume 6, Version 2 Location name: La Quinta, California, US* Latitude: 33.6503°, Longitude: -116.2391° Elevation: -32 ft* • source: Google Maps POINT PRECIPITATION FREQUENCY ESTIMATES 44t Sanja Perica, Sarah Dietz, Sarah Heim, Lillian Hiner, Kazungu Maitaria, Deborah Martin, Sandra Pavlovic, Ishani Roy, Carl Trypaluk, Dale Unruh, Fenglin Yan, Michael Yekta, Tan Zhao, Geoffrey Bonnin, Daniel Brewer, Li -Chuan Chen, Tye Parzybok, John Yarchoan NOAA, National Weather Service, Silver Spring, Maryland PF tabular 1 PF graphical 1 Maps & aerials PF tabular PDS -based point precipitation frequency estimates with 90% confidence intervals (in inches)1 7 (Duration Avera. a recurrence interval ears 1 2 5 10 25 50 100 200 500 1000 5 -min 0.063 (0.053-0.077) 0.098 (0.082-0.119) 0.150 (0.124-0.182) 0.195 (0.161-0.239) 0.265 (0.211-0.335) 0.324 (0.253-0.420) 0.391 (0297-0.519) 0.467 (0.345-0,638) 0.583 (0.413-0.832) 0.687 (0.470-1.02) 10 -min 0.091 (0.076-0.110) 0.141 (0.118-0.171) 0.214 (0.178-0.260) 0.280 (0,231-0.343) 0.379 (0.302-0.481) 0.465 (0,362-0.602) 0.560 (0.426-0.744) 0.669 (0 494-0.914) 0.836 (0.592-1,19) 0.985 (0.673-1.46) 15 -min 0.110 (0.092-0.133) 0.171 (0.142-0.207) 0.259 (0.216-0.315) 0.339 (0,279-0.415),0.366-0.581(( 0.459 0.562 0.678 ('0,438-0.728)_50.515-0.900) 0.809 (0.598-1.11) 1.01 (0,716-1.44) 1.19 40.814-1.76) 30 -min 0.158 (0.132-0.190) 0.245 (0.204-0.297) 0.372 (0.310-0.452) 0.486 (0.401-(1.505) 0.658 (0_525-0,834) 0.807 0.972 (0.629-1.04) (0.740-1.29) 1.16 (0.858-1.59) 1.45 (1.03-2.07) 1.71 (1.17-2.53) 60 -min 0.221 (0.184-0.267) 0.343 (0.286-0.416) 0.521 (0.434-0.533] 0.681 (0.562-0.834) 0.923 (0.735-1.17) 1.13 1.36 (0.882-1.46) (1.04-1.81) 1.63 I (1.20-2.22) 2.03 (1.44-2.90) 2.40 (1.64-3.54) 2 -hr 0.307 (0.256-0.371) 0.453 (0.378-0.548) 0.671 (0.559-0.815) 0.871 (0.719-1 07) 1.18 (0.942-1.50) 1.45 1.76 (1.13-1.88) (1.34-2.34) 2.11 (1.56-2.89) 2.65 (1.88-3.79) 3.14 (2.14-4.63) 3 -hr 0.370 (0.309-0.448) 0.537 0.789 (0.448-0.650)(0,657-0958) 1.02 (0.843-1,25) 1.39 (1.11-1.76) 1.71 2.08 (1.33-2.21) (1,58-2.76) 2.50 (1 85-3.42) 3.17 (2.24-4 51) 3.76 (2.57-5.55) 6 -hr 0.489 (0.408-0.591) 0.703 1.03 (0.586-0.851) (0.854-1.25) 1.33 (1.10-1.63) 1.80 (1.44-2.28) 2.22 2.71 (1.73-2.88) (2.06-3.60) 3.27 (2.42-4.47) 4.15 (2.94-5.92) 4.94 (3.38-7.30) 12 -hr 0.588 (0.491-0.711) 0.864 1.28 (0.721-1.05) (1.06-t55) 1.66 (1.37-2.03) 2.25 (1.80-2.85) 2.77 3.36 (2.16-3.59) (2.56-4.46) 4.04 (2.99-5.52) 5.10 (3.61-7.27) 6.03 (4.12-8.91) 24 -hr 0.737 (0.652-0.850) 1.12 1.68 (0.988-1.29) (1.48-1.94) 2.18 (1.91-2.55) 2.95 (2.50-3.55) 3.61 4.35 (3.00-4.44) (3.53-5.47) 5.19 (4.10-6.71) 6.47 (4.91-8.70) 7.58 (5.56-10.5) 2 -day 0.848 (0.750-0.978). 1.31 1.97 (1.15-1.51) . (1.73-2.28) 2.56 (2.24-2.98) 3.44 (2.91-4.14) 4.18 5.01 (3.47-5.14) (4.06-6.30) 5.93 (4.68-7.66) 7.30 5.54-9-82) 8.48 (6.22-11.8) 3 -day 0.911 (0.806-1.05) 1.41 2.13 (1.25-1.63) (1.88-2.46) 2.76 (2.42-3.22) 3.71 (3.14-4.46) 4.50 5.37 (3.74-5.53) (4.36-6.75) 6.34 (501-8.19) 7.78 (5.90-10.5) 9.00 (661-12.5) 4 -day 0.965 (0.853-1.11) 1.49 2.25 (1.32-1.73) (1,99-2.61) 2.92 (2.56-3.41) 3.92 (3.32-4.72) 4.75 5.66 (3.94-5.83) (4.59-7.12) 6.67 (5.27-8.62) 8.17 (6.20-11.0) 9.44 (693-131) 7 -day 1.02 (0.906-1.18) 1.68 2.38 (1.40-1.82) (2.09-2.75) 3.08 (2.69-3.59) 4.11 (3,48-4.95) 4.97 5.91 (4.13-6.11) (4,80-7.44) 6.95 (5.49-8.98) r 8.48 (6.44-11.4) 9.77 (7.17-13.6) 10 -day 1.05 1.62 2.44 (0.932-1.21) (1.44-1.88) (2,15-2.83) 3.16 (2.76-3.69) 4.22 i (3.58-5.08) 5.10 6.06 (4.24-6.27) (4.92-7.62) 7.12 (5.62-9.20) 8.67 (6.58-11.7) 9.97 (7.32-13,9) 20 -day 1.12 1.75 2.65 (0.994-1.30) (1.55-2.02) (2.34-3.07) 3.44 (3.01-4,02) 4.60 (3.90-5.55) 5.57 6.61 (4.62-6.84) (5.36-8.31) 7.75 (6.12-10.0) 9.40 (7.14-12.6) 10.8 (7.91-15.0) 30 -day 1.18 (1.04-1.36) 1.87 (1.65-2.15) 2.86 (2.52-3.31) 3.73 (3.26-4.35) 5.01 (4.24-6.03) 6.07 7.20 (5.04-7.45) (5.84-9.06) 8.44 (6.66-10.9) 10.2 (7.76-13.7) . 11.7 (8.58-16.2) 45 -day 1.27 2.05 (1.13-1.47) (1.82-2.37) 3.18 (2.80-3.68) 4.17 (3.64-4.86) 5.63 (4.77-6.78) 6.83 8.12 (5.67-8.40) (6,59-10.2) 9.52 (7.52-12.3) 11.5 (8.74-15.5) 13.1 (9.65-18,3) 60 -day 1.34 2.19 (1.18-1.54) (1.94-2.53) 3.43 (3.02-3.97) 4.52 (3.95-5.27) 6.11 (5,18-7.36) 7.44 8.86 (6,18-9,14) (7.19-11.1) 10.4 (8.20-13.4) 12.6 (9.53-16.9) 14.3 (10.5-19.9) 1 Precipitation frequency (PF) estimates in this table are based on frequency analysis o partial duration series (PDS). Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values Please refer to NOM Atlas 14 document for more information. Back to Top PF graphical http://dipper.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?tat=33.6503&ton=-116.2391 &d... 12/7/2015 Precipitation Frequency Data Server 16 14 12 10 8 6 4 2 0 5 10 25 50 100 200 Book to Top Average recurrence interval 4yearsr Maps & aerials Created (GMT): Mon Dec 7 18:06:11 2015 Small scale terrain NOAA Atlas 14, Volume 6, Version 2 hara Los Ange)'cs- d An heinl Long B acho ° . 500 1000 Page 2 of 4 Average recurrence interval (years) 2 5 10 25 50 100 200 500 1000 Duration 64nlrr — 2-dey - 10 mlr► 3 -day 15-m11 4 -day — 304nin 7 -day �- 60arNn 10 -day — 24tt 20 -day — 3 -hr 30 -day — 6 -hr — 45 -day - 12 -hr — 60 -day r tr Go Mogi Of Ma lrr a see • h'.f r San Diego .;{.; 0 . 4th 1 Mexicali Tiju- ana 9, _ t Ensenada 0 4 Yuma kl��a fl l:1 +:otieza l'nru •Nnrrnttal . w+halle nerug� Map data,a4Spi earigNoW4 http://dipper.nws.noaa.gov/hdsc/pfds/pfds j,rintpage.html?lat=33.6503&lon=-116.2391 &d... 12/7/2015 Precipitation Frequency Data Server Page 3 of 4 Large scale terrain Coachella Valley ° Music and Arts Festival Vista Santa Rosa Large scale map e Avenue 4t In*a Jacqueline Cochr liegional Airpc sC Map dRtigomPdi1il5 Bogle Coachella Valley ° Music and Ails Festival Coachi ,eoue S7 Go gle ArrfuN 6t 2 k poi HP,/ Sandy Korne Jacqueline Cochr Regional Airpc Vista Santa Rosa A•.eroIe 60 Map datitem`'PDiYFaeogie Back to Top US Department of Commerce Nrilional Oceanic and Atmospheric Administration National Weather Service National Water Center 1325 East West Highway Silver Spring, MD 20910 http://dipper.nws.noaa.gov/hdsc/pfds/pfds printpage.html?lat=33.6503&ion=-116.2391 &d... 12/7/2015 33° 39'4"N 0 570850 hlyclrologic SoII Grol.ip---Riverside Cnurdy, CoaG'bt:Mai VoIIE:y Area, Cciliforrilci (TRA( - NO. 2670f)- C)WENS RE:i;11)EN(l ) 570870 570!80 Y1089a [ 570900 570910 570930 Mountain View•Ln• .57 770 570270 Van Map .:,czrle: 1; 55? il' panted on A poi t sail' (a,'5" x .1:11) sherd: 570890 570900 a N 0 2S 10 20 Metyrs A 0 Feek 50 O .150 Map piu)edlon: Wrlor Corner axxdinatcs: WGSS4l Fdcie tics: 01 I'•1 %one 11N WGS4 Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey bra 170220 ]3' N4"N n • 37° 33' 0' N 570930 ra 4 12/7/2015 Page 1 of 3 Hydrologic Soil Group—Riverside County, Coachella Valley Area, California (TRACT NO. 26769 - OWENS RESIDENCE) MAP LEGEND Area of Interest (AOI) Area of Interest (AOI) Soils Soil Rating Polygons fI Soil Rating Lines — A "0. A/D rV B .. B/D ..y C ry C/D rV D • s Not rated or not available A A/D B B/D C C/D D Not rated or not available Soil Rating Points A • ■ ■ A/D B 1 B/D ® C • C/D ▪ D ▪ Not rated or not available Water Features Streams and Canals Transportation }� - Rails (m/ Interstate Highways iv US Routes Major Roads Local Roads Background IIII Aerial Photography MAP INFORMATION The soil surveys that comprise your AOI were mapped at 1:24,000. Waming: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: http://websoilsurvey.nres.usda.gov Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Riverside County, Coachella Valley Area, Califomia Survey Area Data: Version 7, Sep 9, 2014 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jan 22, 2015—Feb 10, 2015 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Natural Resources Web Sr ^'irvey Conservation Service National Coop Soil Survey 12/7/20" Page 2 Hydrologic Soil Group—Riverside County, Coachella Valley Area, California TRACT NO 26769 - OWENS RESIDENCE Hydrologic Soil Group Hydrologic Soil Group— Summary by Map Unit — Riverside County, Coachella Valley Area, California (CA680) Map unit symbol ! Map unit name Rating Acres in AO1 Percent of AOI Ip Indio fine sandy loam B 1.3 100.0% Totals for Area of Interest Description 1.3 100.0% Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long -duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink -swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff. None Specified Tie-break Rule: Higher USDA Natural Resources Web Soil Survey 12/7/2015 1-101. Conservation Service National Cooperative Soil Survey Page 3 of 3 RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET DATE: WORKSHEET PREPARED BY: PROJECT NAME PROJECT NUMBER CONCENTRATION POINT DESIGNATION AREA DESIGNATION AMC NUMBER December 23, 2015 SMS OWENS RESIDENCE 1684 (BASIN Al DRAINAGE AREA Al 2 Low Loss Conditions: X=Existing; D=Developed; BS=Retention AREA SOIL TRIBUTARY AREAS DESIG GROUP PAVING/HARDSCAPE LANDSCAPING LENGTH OF WATERCOURSE (L) LENGTH TO POINT OPPOSITE CENTROID (Lca) ELEVATION OF HEADWATER ELEVATION OF CONCENTRATION POINT AVERAGE MANNINGS'N' VALUE STORM FREQUENCY (YEAR) LOW LOSS RATE (For Storms Greater Than 10 Years) POINT RAIN FROM NOAA ATLAS 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR ACRES 0.14 0.20 60 f1 30 ft 104.0 ft 103.0 ft 0.02 100 85% 14 1.36 in 2.08 in 2.71 in 4.35 in AMC II LOW LOSS RI INFILTRATION IMPERVIOUS CONDITION NUMBER RATE PERCENT D 56 0 51 1.00 D 56 0.51 0.10 RCFC & WCD 110371DROIL©ZU KU(IIJL%, d SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM PROJECT: OWENS RESIDENCE Job No.: 1684 BY: SMS DATE: 12/23/15 PHYSICAL DATA IEFFECTIVE RAIN (in) [1] CONCENTRATION PAINT 1.22 BASIN Al [2] AREA DESIGNATION FLOOD VOLUME (cu -ft) (acre -ft) DRAINAGE AREA Al 3] AREA - ACRES 1,513 0.03 0.34 4] L -FEET N/A 80 15] L -MILES 0.12 0.011 [6] La -FEET 30.00 7] La -MILES 0.006 8] ELEVATION OF HEADWATER 104 (9) ELEVATION OF CONCENTRATION POINT 103 10] H -FEET 1 11] S-FEET1MILE 88.0 121 SA0.5 9.38 .] [13] L'LCNS40.5 0.000 [14] AVERAGE MANNINGS'N' 0.02 15] LAG TIME -HOURS 0 01 [16] LAG TIME -MINUTES 0.3 [17] 100% OF LAG -MINUTES 0.3 [18] 200% OF LAG -MINUTES 0.6 RAINFALL DATA [1] AMC 11 [2] FREQUENCY -YEARS 100 NOAA ATLAS 14 [3] DURATION: Point Rain 1 -HOUR 1.36 in 3 -HOUR 2.08 in 6 -HOUR 2.71 in 24-HOUR 4.35 in STORM EVENT SUMMARY DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR IEFFECTIVE RAIN (in) 1.07 1.22 1.23 1.17 FLOOD VOLUME (cu -ft) (acre -ft) 1,316 0.03 1,502 0.03 1,513 0.03 1,439 0.03 'PEAK FLOW (cfs) N/A 0.60 0.52 0.12 NOTE: PEAK FLOW FOR THE 1 -HOUR STORM IS NOT REPRESENTATIVE. PER RCFCD PEAK DISCHARGES FROM THE 3 -HOUR STORM SHOULD NORMALLY COMPARE WELL WITH RATIONAL PEAKS. Plate E-2.1 Page 2 of 9 RCFC & WCD KUDI2OdOgf mamma SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM AMC II PROJECT: Job No.: BY: OWENS RESIDENCE 1684 SMS DATE: 12/23/15 AVERAGE ADJUSTED LOSS RATE SOIL GROUP [Plate C-11 LAND USE PAVINGMARDSCAPE RI NUMBER [Plate E-6.1) 56 PERVIOUS AREA INFILTRATION RATE (in/hr) [Plate E-62) 0.51 DECIMAL PERCENT OF AREA IMPERVIOUS [Plate E-6.31 100% ADJUSTED INFILTRATION RATE (in/hr) 0.05 AREA 0.14 AREA WEIGHTED AVERAGE 11_412 MAX AVERAGE ADJUSTED INFILTRATION RATE (in/hr) 0.0210 LOW LOSS CONDITION DEVELOPED LOW LOSS RATE PER RCFC/2322 (in/hr) 0.1000 MIN AVERAGE ADJUSTED INFILTRATION RATE (in/hr) 0.0412 3 i3 LANDSCAPING 56 0.51 to% 0.46 0.20 0 5833 0.2730 DEVELOPED 0.8200 0.4824 VARIABLE LOSS Fm= C= Ft=C(24-(T/60))" 1.55 CONSTANT LOSS LOW LOSS RATE Where T=Time in minutes. T=1 1/2 unit time RATE CURVE (24-HOUR STORM ONLY) = STORMS) value for each unit etc 0 00272 SUM (24-(T/60))^1.55 + 0.15 = 0.2940 in/hr = 0.8500 in/hr T=1/2 the unit time for the first time period, 0.34 l SUM NOTE: Low loss For 10 Year Storms Undeveloped Condition: Developed Condition: Basin Site: Low For 100 Year Storm of the Rainfall Rate 0.2940 per RCFC/2322 (Dated: May -30-95) = 90% 0.9 - (0.8 * %impervious) be between 80% & 90% 0.5235 in/hr rates established or Less Low Loss Low Loss = Loss = 10 % - Low Loss should 0.147 0.00272 RATE (3 & 6 HOUR To get an average for The second period time period. Use Plate E-2.1 Page 3 of 9 RCFC & WCD IIVID CAd©®V AMA G^ rlJL d SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 1 -HOUR STORM PROJECT: OWENS RESIDENCE Job No.: 1684 DATE BY: SMS 12/23/15 UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM DRAINAGE AREA -ACRES 0.34 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 0.31 UNIT TIME -PERCENT OF LAG 1589.4 TOTAL ADJUSTED STORM RAIN -INCHES 1.36 CONSTANT LOSS RATE-in/hr 0.29 LOW LOSS RATE - PERCENT 85% Unit Time Period Time Minutes Hours Pattern Percent (Plate E-5,9) Storm Rain in/hr Loss Rate in/hr Max Low Effective Rain in/hr Flood Hydrograph Flow cfs 1 5 0.08 3.6 0.59 0 29 0.50 0 29 0.10 2 10 0.17 4.2 0.69 0.29 0.58 0.39 0.13 3 15 0 25 4.4 0.72 0.29 0.61 0.42 0.15 4 20 0.33 4.6 0.75 0.29 0.64 0.46 0.16 5 25 0.42 5.0 0.82 0.29 0 69 0.52 0.18 6 30 0.50 5.6 0 91 0.29 0.78 0.62 0 21 7 35 0.58 6.4 1 04 0 29 0.89 0.75 0.26 8 40 0.67 8.1 1.32 0.29 1.12 1.03 0.35 9 45 0.75 13.1 2.14 0.29 1.82 1.84 0.63 10 50 0.83 34.5 5.63 0.29 4.79 5.34 1.83 11 55 0.92 6.7 1.09 0,29 0.93 0.80 0.27 12 60 1.00 3.8 0.82 0.29 _ 0,53 033 0.11 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY EFFECTIVE RAIN (in) FLOOD VOLUME (acft) FLOOD VOLUME (cuft) PEAK FLOW RATE (cfs) 1.07 0 03 1,316 1.83 Plate E-2.2 1 Hour Storm Page 4 of 9 RCFC & WCD Ui �� '��d�®� 1I�L" bila°. d SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM PROJECT: OWENS RESIDENCE Job No.: 1684 DATE 13Y: SMS 12/23/15 UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM DRAINAGE AREA•ACRES 0.34 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 0 31 UNIT TIME -PERCENT OF LAG 1589.4 TOTAL ADJUSTED STORM RAIN -INCHES 2 08 CONSTANT LOSS RATE-in/hr 0.20 LOW LOSS RATE - PERCENT 85%' Unit Time Period Time Minutes Hours Pattern Percent (Plate E-5 9) Storm Rain in/hr Loss Rate in/hr Effective Rain in/hr Flood Hydrograph Flow cfs Max Low 1 5 0.08 1.3 0.32 0.29 0.28 0.03 0.01 2 10 017 1.3 0.32 0.29 028 0.03 0.01 3 15 0.25 1.1 0 27 0.29 0 23 0.04 0.01 4 20 0.33 1.5 0.37 0.29 0.32 0,08 0.03 5 25 0.42 1.5 0.37 0.29 0.32 0.08 0.03 6 30 0 50 1.8 0.45 0.29 0.38 0,16 0,05 7 35 0.58 15 0.37 0.29 0.32 0,08 0.03 8 40 0.67 1.8 0.45 0.29 0,38 0.16 0.05 - 0 45 0.75 1.8 0.45 0.29 0.38 0.16 0.05 10 50 - 0.83 1.5 0.37 0,29 0.32 0,08 0.03 11 55 0.92 1.6 _ _-- 0.40 029 0.34 0,11 0.04 12 60 1.00 1.8 0.45 0,29 0,38 0.16 0.05 13 65 1.08 2.2 0,55 0.29 0.47 0.26 0.09 14 70 1.17 2.2 0,55 0,29 0.47 0.26 0.09 15 75 1.25 2.2 0.55 0.29 0.47 _ 0.26 0.09 16 80 1,33 2.0 0.50 0.29 0.42 0.21 0.07 17 85 1.42 2.6 0.65 0.29 0,55 0.35 0.12 1.8 90 1.50 2 7 0.67 0.29 0.57 0.38 0.13 19 95 1.58 2.4 0.60__ 0,29 0.51 0.31 0.10 20 100 1.67 2.7 0.67 0.29 0.57 0.38 0.13 21 105 1.75 _ 3.3 0.82 0.29 0.70 0.53 0.18 22 110 1.83 3.1 0.77 0.29 0.66 0.48 0.16 23 115 1.92 2.9 0.72 0.29 0.62 0.43 0.15 24 120 2.00 3.0 0.75 0.29 0.84 0.45 0,16 25 125 2.08 3.1 0.77 029 0.86 0.48 016 26 130 2.17 4.2 1.05 0.29 0.89 0.75 0,26 27 135 - _- 2.25 5.0 1,25 0 29 1.06 0.95 0.33 28 140 2.33 3.5 0,87 0 29 0,74 0,58 0.20 29 145 2.42 6.8 1.70 0 29 1.44 1.40 - 0.48 30 150 2.50 7.3 1.82 0.29 1.55 1.53 0.52 31 155 2 5B 8,2 2.05 0.29 1.74 1.75 0.60 32 160 2.67 5.9 1.47 0.29 1.25 1.18 0.40 33 165 2.75 2.0 0.50 0.29 0.42 0.21 0.07 34 170 2.83 1.8 0.46 0.29 0.38 0.16 0.05 35 175 2.92 18 0.45 0,29 0.38 0.16 0.05 36 180 3.00 0.6 0.15 0.29 0.13 0.02 0.01 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY EFFECTIVE RAIN (in) FLOOD VOLUME (acft) FLOOD VOLUME (cuft) PEAK FLOW RATE (cfs) 1.22 0.03 1,502 0.60 Plate E-2 2 3 -Hour Storm Page 5 of 9 RCFC & WCD GOWDQOdCD@'W PAAL:1llVULM, SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM PROJECT: OWENS RESIDENCE Job No.: 1684 DATE BY: SMS 12/23/15 UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM DRAINAGE AREA -ACRES 0.34 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 0.31 UNIT TIME -PERCENT OF LAG 1589 4 TOTAL ADJUSTED STORM RAIN -INCHES 2.71 CONSTANT LOSS RATE-in/hr 0 294 LOW LOSS RATE - PERCENT 85% Unit Time Period Time Minutes Hours Pattern Percent (Plate E-5.9) Storm Rain in/hr Loss Rate in hr Max Low Effective Rain in/hr Flood Hydrograph Flow cfs 1 5 0.08 0.5 0.163 0 29 0.14_ 0.02 0.01 2 10 0.17 0.6 0.195 0.29 0.17 0.03 0.01 3 15 0.25 0.6 0.195 0.29 0.17 0.03 0.01 4 20 0.33 0.6 0.195 0.29 0.17 0.03 0.01 5 25 0.42 0.6 0.195 0.29 0.17 0 03 0.01 6 30 0.50 0,7 0.228 0.29 0.19 0.03 0.01 7 35 0.58 0.7 0.228 0.29 0.19 0.03 0.01 8 40 0.67 0,7 0.228 0 29 0.19 0.03 0.01 __ 9 45 0.75 0.7 0.228 0.29 0.19 0.03 0.01 _ _ 10 50 0.83 0.7 0.228 0.29 0.19 0.03 0.01 11 55 0.92 0.7 0.228 0.29 0.19 0.03 0.01 12 60 100 0.8 0.260 0.29 0.22 0.04 0.01 13 65 1.08 0.8 0.260 0.29 0.22 0.04 0.01 14 70 1.17 0.8 0.260 0.29 0.22 0 04 0.01 15 75 1.25 0.8 0.260 0.29 0.22 0.04 0.01 16 80 1.33 0.8 0.260 0.29 0.22 0.04 0.01 17 85 1.42 0.8 0 260 0.29 0.22 0.04 0.01 18 90 1.50 0.8 0 260 0.29 0.22 0.04 0.01 19 95 1.58 0.8 0.260 0 29 0.22 0.04 0.01 20 100 1.67 0.8 0.260 0.29 0.22 0.04 0.01 21 105 1.75 0,8 0260 0 29 0.22 0.04 0.01 22 110 1.83 0.8 0 260 0.29 0.22 0.04 0.01 23 115 1.92 0.8 0.260 0.29 0.22 0.04 0.01 24 120 2.00 0.9 0.293 0.29 0.25 0.04 0.02 25 125 2.08 0 8 0.260 0.29 0.22 0 04 0.01 26 130 217 0.9 0.293 0.29 0.25 0.04 0.02 27 135 2,25 0.9 0.293 0.29 0.25 0.04 0.02 28 140 2.33 0.9 0.293 0.29 0.25 0.04 0.02 29 145 2.42 0.9 _ 0.293_ 0.29 0.25 0.04 0.02 30 150 2.50 0.9 0.293 0.29 0.25 0.04 0.02 31 155 2.58 0.9 0.293 0.29 0.25 0.04 0.02 32 160 2.67 0.9 0.293 0.29 !~ 0.25 - 0 04 0.02 33 165 2.75 1.0 0.325 0.29 0.28 0 03 _ 0.01 34 170 2.83 1.0 0.325 0.29 0.28 0 03 0.01 35 175 2.92 10 0.325 0.29 0.28 0.03 0.01 36 180 3.00 1.0 0.325 0.29 0.28 0.03 0.01 37 185 3.08 1.0 0.325 0.29 0 28 0.03 1 0.01 38 190 3.17 1.1 0.358 0.29 0.30 0.06 0.02 39 195 _ 3.25 1.1 0.358 0.29 0.30 0.06 0.02 40 200 3,33 1.1 0 358 0.29 0.30 0.06 0.02 41 205 3.42 1.2 0.390 0.29 0.33 0.10 0.03 42 210 3.50 1.3 0.423 0.29 0.36 0.13 0.04 43 215 3.58 1.4 0.455 0.29 0.39 0.16 0.06 44 220 3.67 1.4 0.455 0,29 0.39 0.16 0 06 _ 45 225 3.75 1.5 0.488 0.29 0.41 019 0.07 46 230 3.83 1.5 0.488 0.29 0.41 0.19 0.07 47 235 3.92 1.6 0.520 0.29 0.44 0.23 0.08 48 240 4.00 1.6 0.520 0.29 0.44 0.23 0.08 49 245 4.08 1.7 0.553 0.29 0.47 0.26 0.09 50 250 4.17 1.8 0.585 0.29 0.50 1 0.29 1 0.10 Plate E-2.2 6 -Hour Storm Page 6 of 9 RCFC & WCD rNi VIDQDdarf AMA G19 GX1 JL d SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM PROJECT: OWENS RESIDENCE Job No.: 1684 DATE BY: SMS 12/23/15 UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM DRAINAGE AREA -ACRES 0.34 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 0.31 UNIT TIME -PERCENT OF LAG 1589.4 TOTAL ADJUSTED STORM RAIN -INCHES 2.71 CONSTANT LOSS RATE-in/hr 0.294 LOW LOSS RATE - PERCENT 85% Unit Time Period Time Minutes Hours Pattern Percent (Plate E-5.9) Storm Rain in/hr Loss Rate in/hr Low Effective Rain rn/hr Flood Hydrograph Flow cfs Max 51 255 4.25 1.9 0.618 0.29 0.53 0.32 0.11 52 260 4.33 2.0 0.650 0.29 0.55 0.36 012 53 265 4.42 2.1 0.683 0.29 0.58 0.39 0.13 54 270 4.50 2.1 0.683 0.29 0.58 0.39 0.13 55 275 458 22 0.715 0.29 061 0.42 014 56 280 4.67 2.3 0.748 0.29 0.64 0.45 0.16 57 285 4 75 2 4 0.780 0.29 0.66 0.49 0 17 58 290 4.83 2 4 0,780 0.29 0.66 0.49 0.17 59 295 4.92 2.5 0.813 0.29 0.69 0.52 018 60 300 5.00 2.6 0.846 0.29 0.72 0.55 0.19 61 305 5.08 3.1 1.008 0.29 0.86 0.71 0 24 62 310 5.17 3.6 1171 0.29 1.00 0.88 0.30 63 315 5 25 3.9 1.268 0.29 1.08 0.97 0.33 64 320 5.33 4 2 1.366 0.29 1.16 1.07 0.37 65 325 5.42 4.7 1.528 0.29 1.30 1.23 0.42 66 330 5.50 5.6 1.821 0.29 1.55 1.53 0.52 67 335 5.58 1.9 0.618 0.29 0.53 0.32 0.11 68 340 5.67 0.9 0.293 0.29 0.25 0.04 0.02 69 345 5.75 0.6 0.195 0.29 0.17 0.03 0.01 70 350 5.83 0.5 0.163 0.29 0.14 0.02 0 01 71 355 5.92 0.3 0.098 0.29 0.08 0.01 0.01 72 360 6.00 0.2 0 065 0 29 0.06 0.01 0.00 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY EFFECTIVE RAIN (in) FLOOD VOLUME (acft) FLOOD VOLUME (cuft) PEAK FLOW RATE (cfs) 1.23 0 03 1,513 0 52 Plate E-2.2 6 -Hour Storm Page 7 of 9 RCFC & WCD MUD2CILCAU PA&H10 L SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM PROJECT: OWENS RESIDENCE Job No.: 1684 DATE: BY: SMS 12/23/15 UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM DRAINAGE AREA -ACRES 0.340 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 0.31 UNIT TIME -PERCENT OF LAG 4768.1 TOTAL ADJUSTED STORM RAIN -INCHES 4.35 CONSTANT LOSS RATE-in/hr n/a VARIABLE LOSS RATE (AVG) in/hr 0.2940 MINIMUM LOSS RATE (for var. loss) - in/hr 0 147 LOW LOSS RATE - DECIMAL 0.85 C 0.00272 Unit Time Period Time Minutes Hours Pattern Percent (Plate E-5.9) Storm Rain in/hr Loss Rate in/hr Max Low Effective Rain in/hr Fiooa Hydrograph Flow cfs 1 15 0.25 0.2 0 035 0.519 0.030 0.005 0.00 2 _ _ _ 30 0 50 0 3 0.052 _ 0.513 0.044 0.008 0.00 3 45 0.75 0,3 0.052 0,507 0 044 0 008 0.00 4 60 1.00 0.4 0.070 0.501 0.059 0.010 0.00 5 75 1.25 0,3 0.062 0.495 0.044 0.008 0 00 6 90 1.50 0.3 0.052 0.489 0 044 0.008 0.00 7 105 1.75 0.3 0.052 0.484 0.044 0.008 0.00 8 120 2.00 0.4 0.070 0.478 0.059 0.010 0.00 9 135 2.25 0.4 0.070 0.472 0.059 0.010 0.00 10 15D 2.50 0,4 _ _ 0.070 _. 0 466 0.059 0.010 0.00 11 165 2.75 0 5 0.087 0 461 0.074 0.013 0.00 12 180 3,00 05 0.087 0.455 0.074 0.013 0.00 13 195 3.25 0.5 0.087 0.449 0.074 0.013 0.00 14 210 3.50 0 5 0.087 0 444 0.074 0.013 0.00 15 225 3.75 0.5 0.087 0,438 0.074 0.013 0.00 16 240 4.00 0.6 0.104 0.433 0.089 0.016 0.01 17 255 4.25 0 6 0 104 0.427 0.089 0.016 0.01 18 270 4.50 0.7 0.122 0.422 0.104 0.018 0.01 19 285 4.75 0.7 0122 0.416 0.104 0.018 0.01 20 300 5.00 0.8 0.139 0.411 0.118 0.021 0.01 21 315 5.25 0.6 0.104 0.406 0.089 0.016 0 01 22 330 5,50 0.7 0 122 0.400 0.104 0,018 0 01 23 345 5.75 0.8 0.139 0.395 0 118 0 021 0.01 24 360 6 00 0.8 0.139 0,390 0.118 0.021 0.01 25 375 6 25 0.9 0.157 0.385 0.133 0.023 0.01 26 390 6.50 0.9 0.157 0.380 0.133 0.023 0.01 27 405 6.75 1.0 0.174 0.374 0.148 0.026 0 01 28 420 7.00 1.0 0.174 0.369 0.148 0.026 _ 0.01 29 435 7.25 1.0 0.174 0.364 _ 0.148 0 026 0 01 30 450 7.50 1.1 _ 0.191 0.359 0 163 0 029 0.01 31 465 7,75 1 2 0 209 0.354 0.177 0 031 0 01 32 480 8.00 1.3 0.226 0.350 0.192 0.034 0.01 33 495 8 25 1 5 0 261 0 345 0.222 0 039 0.01 34 510 8,50 1.5 0 261 0.340 0.222 0 039 0 01 35 525 8.75 1.6 0.278 0.335 0.237 0.042 0 01 36 540 9.00 1.7 0.296 0.330 0.251 0 044 0.02 37 555 9.25 1.9 0.331 0.326 0.281 0.005 0.00 38 570 9,50 2.0 0.348 0.321 0.296 0.027 0.01 39 5.......85 9.75 2,1 _ 0 365 0.317 0.311 0.049 0.02 40 600 10.00 2,2 0,383 0.312 0.325 0.071 002 41 615 _ 10.25 1.5 0.261 0.307 0.222 0.039 0.01 42 630 10.50 1,5 0.261 0.303 0 222 0 039 0.01 43 645 10.75 2.0 0.348 0.299 0.296 0.049 0.02 44 660 11.00 2.0 0.348 0.294 0.296 0,054 0.02 45 675 11.25 1.9 0.331 0.290 0.281 0 041 001 46 690 11.50 1.9 0.331 0.286 I 0.281 0.045 _ 0.02 47 705 11.75 1.7 0296 0.281 0.251 0.014 0.00 48 720 12.00 1.8 0.313 0.277 0.266 0 036 0.01 49 735 12,25 2.5 0,435 0.273 0.370 0.162 0.06 50 750 12.50 2.6 0.452 0.269 0 385 0.183 0.06 51 765 12.75 2.8 0.487 0,285 0,414 0.222 0.08 52 780 13.00 2.9 0.505 0.261 0.429 0.244 0.08 53 795 13.25 3.4 0.592 0.257 0.503 0.335 0.11 54 810 13.50 3.4 0.592 0.253 0.503 0.338 0.12 55 825 1375 ' 2,3 0.400 0,249 0.340 0.151 0.05 56 840 14.00 2.3 0.400 0.245 0.340 0.155 0 05 57 855 14.25 2.7 0.470 0.242 0.399 0.228 0.08 58 870 14.50 2.6 0.452 0.238 0.385 0.214 0.07_ 59 885 14.75 2.6 0.452 0.234 0.385 0.218 0.07 60 _ 900 15.00 2.5 0.435 0231 0,370 0.204 0,07 61 915 15.25 2.4 0.418 0.227 0.355 0.190 0.07 Plate E-2.2 24 Hour Storm Page 8 of 9 RCFC & WCD r�i VIDU Od(DW GV1AG1°.Gl]ML EL SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM PROJECT: OWENS RESIDENCE Job No.: 1684 DATE: BY: SMS 12/23/15 UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM DRAINAGE AREA -ACRES 0 340 UNIT TIME -MINUTES 15 LAG TIME - MINUTES 0 31 (UNIT TIME -PERCENT OF LAG 4768.1 TOTAL ADJUSTED STORM RAIN -INCHES 4.35 CONSTANT LOSS RATE-inTnr nia VARIABLE LOSS RATE (AVG) in/hr 0 2940 MINIMUM LOSS RATE (for var. loss) - in/hr 0.147 LOW LOSS RATE - DECIMAL 0.85 C 0.00272 Unit Time Period Time Minutes Hours Pattern Percent (Plate E-5.9) Storm Rain in/hr Loss Rate in/hr Max Low Effective Rain Flood Hydrograph Flow cfs in/hr 62 930 15.50 2.3 0,400 0.224 0.340 0.176 0 06 63 945 15 75 1.9 0 331 0.220 0,281 0,110 0 04 64 960 16.00 1.9 0,331 0.217 0 281 0.114 0.04 65 975 16 25 0.4 0.070 0.214 0.059 0.010 0 00 65 990 16.50 0.4 0.070 0,210 0.059 0.010 0.00 67 1005 16.75 0.3 0.052 0.207 0.044 0.008 0.00 68 1020 17.00 0.3 0.052 0.204 0.044 0.008 0.00 69 1035 17.25 0.5 0 087 0,201 0 074 0.013 0.00 70 1050 17.50 0.5 0.087 0.198 0.074 0.013 0.00 71 1065 17.75 0.5 0,087 0.195 0074 0.013 0.00 72 1060 18.00 0,4 0.070 0.192 0.059 0,010 0,00 73 1095 18.25 0.4 0.070 0.189 0 059 0.010 0.00 74 1110 18.50 0,4 0.070 0187 0059 0.010 0.00 75 1125 18.75 0.3 0.052 0.184 0.044 0.008 0.00 76 1140 19.00 0.2 0.035 0.181 0.030 0.005 0.00 77 1155 19.25 0.3 0.052 0.179 0.044 0 008 0.00 78 1170 19.50 0.4 0.070 0.176 0.059 0.010 0.00 79 1185 19.75 0,3 0.052 0.174 0.044 0.008 _ 0.00 80 1200 20.00 0.2 0,035 0 171 0.030 0.005 _0 00 _ 81 1215 20.25 0.3 0.052 0,169 0 044 0.008 0 00 82 1230 20.50 0.3 0.052 0.167 0.044 0.008 0.00 83 1245 20.75 0.3 0.052 0 165 0.044 0 008 0 00 84 1260 21.00 0.2 0.035 0.163 0.030 0 005 0 00 85 1275 21.25 0.3 0.052 0.161 0.044 0.008 0.00 86 1290 2150 0.2 0.035 0.159 0.030 0.005 000 87 1305 21.75 0.3 0.052 0.157 0.044 0.008 0.00 88 1320 22 00 0.2 0.035 0 156 0.030 0 005 0.00 89 1335 22.25 0.3 0.052 0.154 _0.044 0.008 0.00 90 1350 22.50 0.2 0,035 0 153 0 030 0 005 0.00 91 1365 22.75 0.2 0.035 0.151 0.030 0.005 0,00 92 1380 23.00 0 2 0 035 0-150 0 030 0 005 0.00 03 1395 23 25 0.2 0.035 0.149 0.030 0.005 0.00 94 1410 23 50 0.2 0.035 0.148 0.030 0.005 0.00 95 1425 23.75 0.2 0 035 0 148 0 030 0.005 0.00 96 1440 24.00 0.2 0.035 0.147 0.030 0.005 0.00 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY EFFECTIVE RAIN (in) FLOOD VOLUME (acft) FLOOD VOLUME (cuff) PEAK FLOW (cfs) 1.17 0.03 1,439 012 Plate E-2 2 24 Hour Storm Page 9 of 9 RCFCD SYNTHETIC UNIT HYDROGRAPH - SHORTCUT METHOD DATA INPUT SHEET DATE: WORKSHEET PREPARED BY: PROJECT NAME PROJECT NUMBER CONCENTRATION POINT DESIGNATION AREA DESIGNATION AMC NUMBER December 23, 2015 SMS OWENS RESIDENCE 1684 I BASIN A2 IDRAINAGE AREA A2 Low Loss Conditions: X=Existing; D=Developed; BS=Retention AREA SOIL TRIBUTARY AREAS DESIG GROUP 2 B 9 B PAVING/HARDSCAPE LANDSCAPING LENGTH OF WATERCOURSE (L) LENGTH TO POINT OPPOSITE CENTROID (Lca) ELEVATION OF HEADWATER ELEVATION OF CONCENTRATION POINT AVERAGE MANNINGS'N' VALUE STORM FREQUENCY (YEAR) LOW LOSS RATE (For Storms Greater Than 10 Years) POINT RAIN FROM NOAA ATLAS 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR ACRES 0.27 0.64 50 ft 25f1 104.0 ft 103.7 f1 0.021 100 85% 14 1.36 in 2.08 in 2.71 in 4.35 In LOW LOSS CONDITION D D RI NUMBER 56 56 AMC II INFILTRATION IMPERVIOUS RATE PERCENT 0 51 1.00 0.51 0 10 RCFC & WCD 1VIDQOdCGf G�7A °a, G]MLad SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM PROJECT: OWENS RESIDENCE Job No : 1684 13Y: SMS DATE: 12/23/15 PHYSICAL DATA EFFECTIVE RAIN (in) [1] CONCENTRATION POINT 1.09 BASIN A2 [2] AREA DESIGNATION FLOOD VOLUME (cu -ft) (acre -ft) DRAINAGE AREA A2 [3] AREA - ACRES 3,681 0.08 0 91 [4] L -FEET N/A 50 1531.. -MILES 0 27, 0.009 [6] La -FEET 25.00 [] La -MILES 0.005 113] ELEVATION OF HEADWATER 104 91 ELEVATION OF CONCENTRATION POINT 103.7 [10] H -FEET 0.3 111] S-FEET/MILE 31.7 112] SA0.5 5.63 113) L'LCA/SA0.5 _ 0 000 114] AVERAGE MANNINGS'N' 0.02 [15] LAG TIME -HOURS 0.01 [16] LAG TIME -MINUTES 0.3 j17] 100% OF LAG -MINUTES 0.3 j18] 200% OF LAG -MINUTES 0.7 RAINFALL DATA [1] AMC II [2] FREQUENCY -YEARS 100 INOAA ATLAS 14 [3] DURATION: Point Rain 1 -HOUR 1.36 in 3 -HOUR 2 08 in 6 -HOUR 2 71 in 24-HOUR 4.35 in STORM EVENT SUMMARY 'DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR EFFECTIVE RAIN (in) 1.02 1.09 1.11 1.00 FLOOD VOLUME (cu -ft) (acre -ft) 3,364 0.08 3,611 0.08 3,681 0.08 3,317 0.08 PEAK FLOW (cfs) N/A 1.56 1.36 0 27, NOTE: PEAK FLOW FOR THE 1 -HOUR STORM IS NOT REPRESENTATIVE. PER RCFCD PEAK DISCHARGES FROM THE 3 -HOUR STORM SHOULD NORMALLY COMPARE WELL WITH RATIONAL PEAKS. Plate E-2.1 Page 2 of 9 RCFC & WCD c aoaoc17 mamma SYNTHETIC UNIT HYDROGRAPH METHOD BASIC DATA CALCULATION FORM AMC II PROJECT: Job No.: BY: OWENS RESIDENCE 1684 SMS DATE: 12/23/15 AVERAGE ADJUSTED LOSS RATE SOIL GROUP [Plate C-1] LAND USE RI NUMBER [Plate E-6.11 PERVIOUS AREA INFILTRATION RATE (in/hr) [Plate E-6.2] DECIMAL PERCENT OF AREA IMPERVIOUS [Plate E-6.31 ADJUSTED INFILTRATION RATE (in/hr) AREA AREA WEIGHTED AVERAGE MAX AVERAGE ADJUSTED INFILTRATION RATE (in/hr) LOW LOSS CONDITION LOW LOSS RATE PER RCFC/2322 (in/hr) r MIN AVERAGE ADJUSTED INFILTRATION RATE (in/hr) 8 PAVING/HARDSCAPE 56 0.51 100% 005 0.27 0297 0.0151 DEVELOPED 0.1000 0.0297 B LANDSCAPING 56 0.51 10% 0.46 0.64 0.703 0.3264 DEVELOPED 0.8200 0.5767 VARIABLE LOSS Fm= C= Ft' -C(24 -(T/60))^1.55 CONSTANT LOSS LOW LOSS RATE Where. T=Tome in minutes. T=1 1/2 unit time RATE CURVE (24-HOUR STORM ONLY) = STORMS) value for each unit etc 0.00316 SUM (24-(T/60))^1.55 + 0.17 = 0.3415 in/hr = 0.8500 in/hr T=1/2 the unit time for the first time period, 0.91 SUM NOTE: Low toss For 10 Year Storms Undeveloped Condition: Developed Condition: Basin Site: Low For 100 Year Storm of the Rainfall Rate 0.3415 per RCFC/2322 (Dated: May -30-95) = 90% 0.9 - (0.8 * %impervious) be between 80% & 90% 0 6064 in/hr rates established or Less Low Loss Low Loss = Loss =10% - Low Loss should 0.170765934 0.00316 RATE (3 & 6 HOUR To get an average for the second period, time period, Use Plate E-2.1 Page 3 of 9 RCFC & WCD 0d2 `W`VIDQ®� G� lA G^Q NIYI oal SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 1 -HOUR STORM PROJECT: OWENS RESIDENCE Job No.: 1684 DATE IBY: SMS 12/23/15 UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM DRAINAGE AREA -ACRES 0.31 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 0.33 UNIT TIME -PERCENT OF LAG 1503.5 TOTAI. ADJUSTED STORM RAIN -INCHES 1.36 CONSTANT LOSS RATE-in/hr 0.34 LOW LOSS RATE - PERCENT 85% Unit Time Period Time Minutes Hours Pattern Percent E-5.9) Storm Rain in/hr Loss Rate in/hr Max Low Effective Rain in/hr Flood Hydrograph Flow cfs 1 5 0.08 _plate 3.6 0.59 0.34 0..50 0.25 0 23 2 10 0.17 4.2 0.69 0.34 0.58 0.34 0.32 3 15 0.25 4.4 0.72 0,34 0.61 038 0.35 4 20 0.33 4.6 0.75 0,34 0 64 0.41 0.38 5 25 0.42 5.0 0.82 0,34 0.69 0.47 0.44 6 30 0 50 5,6 0.91 0.34 0.78 0.57 0.53 7 35 0.58 6,4 1,04 0.34 0.89 0.70 0.65 6 40 0.67 8.1 1.32 0.34 1.12 0.98 0.90 9 45 0.75 13.1 2,14 0.34 1.82 1.80 1.65 10 50 0.83 34.5 5.63 0.34 4 79 5.29 4.85 11 55 0 92 6.7 1.09 0.34 0.93 0.75 0.69 12 60 100 3.8 0.62 0.34 0.53 0.28 0.26 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY EFFECTIVE RAIN (in) FLOOD VOLUME (acft) FLOOD VOLUME (cuft) PEAK FLOW RATE (cfs) 1.02 0.08 3,364 4.85 Plate E-2.2 1 Hour Storm Page 4 of 9 RCFC & WCD G`f]i 17DQ©E1 © 7 GV1AG19llEaEL SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 3 -HOUR STORM PROJECT: OWENS RESIDENCE Job No.: 1684 DATE IBY: SMS 12/23/15 UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM DRAINAGEAREA.ACRFS 0 91 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 0.33 UNIT TIME -PERCENT OF LAG 1503 5 TOTAL ADJUSTED STORM RAIN -INCHES 2 08 CONSTANT LOSS RATE-in/hr 0 34 LOW LOSS RATE - PERCENT 85% Unit Time Period Time Minutes Hours Pattern Percent (Plate E-5.9) Storm Rain in/hr Loss Rate in/hr Max Low Effective Rain in/hr Flood Hydrograph Flow cfs 1 5 0.08 1..3 0.32 0.34 0.28 0.05 0.04 2 10 0.17 1.3 0.32 0,34 0.28 0.05 0.04 3 15 0.25 1.1 0.27 0.34 0.23 0.04 0.04 4 20 0.33 1.5 0.37 0.34 0.32 0.03 0.03 5 25 0.42 1.5 0-37 0.34 0.32 0.03 0.03 6 30 0.50 1.8 0.45 0.34 0.38 0.11 0.10 7 35 0..58 1.5 0.37 0.34 0.32 0.03 0.03 8 40 _ 0.67 _ 1.8 0.45 0.34 0.38 0.11 0.10 9 45 0.75 1.8 0.45 0.34 0.38 0.11 0.10 10 50 0 83 1.5 0.37 0.34 0.32 0.03 0.03 11 55 0.92 1.6 0,40 0,34 034 0.06 0.05 12 60 1.00 1.8 0.45 0.34 0.38 0.11 0.10 13 65 1.08 2.2 0.55 0.34 0.47 0.21 019 14 70 1.17 2.2 0.55 0.34 0.47 0.21 0.19 _ 15 75 1,25 2,2 0,55 0.34 0.47 0.21 0.19 _ 16 80 1.33 2.0 0.50 0.34 0.42 0.16 0.14 17 85 1.42 2.6 0.65 0.34 0.55 0,31 028 16 90 1.50 2,7 0.67 0.34 0.57 0.33 0.30 19 95 1.58 2,4 0.60 0 34 0,51 0.26 0.24 20 100 167 2.7 0.67 0.34 0,57 0.33 0.30 21 105 1.75 3.3 0,82 0.34 0,70 0.48 044 22 110 1.83 3 1 0,77 0 34 0.66 0 43 0.40 23 115 1.92 2.9 0,72 0.34 0,62 0.38 0.35 24 120 2.00 3.0 0.75 0.34 0.64 0.41 0.37 25 125 2.08 3.1 0.77 0.34 0.66 0.43 0.40 26 130 217 4.2 1.05 0.34 0.89 0.71 0.65 27 135 2.25 5,0 1.25 0.34 1,06 0.91 0.83 28 140 2.33 3.5 0.87 0,34 0.74 0.53 0.49 29 145 2.42 6.8 1.70 0.34 1.44 1.36 1.24 30 150 2.50 7.3 1.82 0.34 1.55 1.48 1.36 31 155 2.58 8.2 205 0.34 1.74 1.71 1.56 32 160 _ 2.67 5.9 ---- --- 1.47 0.34 1.25 1.13 - 1.04 33 165 2.75 2.0 0.50 0,34 0.42 0,16 0.14 34 170 2.83 1.8 _ 0.45 0,34 0.38 0,11 0.10 35 175 2.92 1.8 0,45 0.34 0.38 0.11 0.10 36 180 3.00 0.6 0,15 0,34 0.13 0.02 0.02 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY EFFECTIVE RAIN (in) FLOOD VOLUME (acft) FLOOD VOLUME (cuft) PEAK FLOW RATE (cfs) 1.09 0.08 3,611 1.56 Plate E-2 2 3 -Hour Storm Page 5 of 9 RCFC & WCD M ll 19U ]i CLSC®W G�7AG°Qt1 JLA SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6 -HOUR STORM PROJECT: OWENS RESIDENCE Job No.: 1684 DATE BY: SMS 12/23/15 UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM DRAINAGE AREA -ACRES 0 91 UNIT TIME -MINUTES 5 LAG TIME - MINUTES 0.33 UNIT TIME -PERCENT OF LAG 1503 5 TOTAL ADJUSTED STORM RAIN -INCHES 2 71 CONSTANT LOSS RATE-in/hr 0 342 LOW LOSS RATE - PERCENT 85% Unit Time Period Time Minutes Hours Pattern Percent (Plate E-5.9) Storm Rain in/hr Loss Rate in hr Max Low Effective Rain in/hr Flood Hydrograph Flow cfs 1 5 0.08 0.5 0.163 0.34 0.14 0.02 0.02 2 10 0.17 0.6 0.195 0.34 0.17 0 03 0.03 3 15 0.25 0.6 0.195 0.34 0.17 0.03 0.03 4 20 0.33 0.6 0.195 0.34 0.17 0.03 0.03 5 25 0.42 0.6 0.195 0134 0.17 0 03 0.03 6 30 0.50 0.7 0.228 0.34 0.19 0.03 0.03 7 35 0.58 0.7 0 228 0.34 0.19 0.03 0.03 8 40 0.67 0.7 0.228 0.34 0.19 0.03 0.03 9 45 0.75 0.7 0.228 0 34 0.19 0.03 0.03 10 50 0.83 0.7 0.228 0 34 0.19 0.03 0.03 11 55 0.92 0.7 0.228 0 34 0.19 0.03 0.03 12 60 1.00 0.8 0.260 0.34 0.22 0.04 0.04 13 65 1.08 0 8 0.260 0.34 0.22 0.04 0,04 14 70 1.17 0.8 0.260 0.34 0.22 0.04 0.04 15 75 1.25 0 8 0.260 0.34 0.22 0.04 0.04 16 80 1.33 0.8 0.260 0.34 0.22 0.04 0.04 17 85 1.42 0.8 0.260 0.34 0.22 0, 04 0.04 18 90 1.50 0.8 0 260 0 34 _0.22 0 04 0.04 19 95 1.58 0.8 0.260 0.34 0.22 0.04 0.04 20 100 1.67 0.8 0.260 0.34 0.22 0.04 0.04 21 105 175 0.8 0.260 0.34 0.22 0.04 0.04 22 110 1.83 0.8 0.260 0.34 0.22 0.04 0.04 23 115 1.92 0.8 0 260 0 34 0.22 0.04 0.04 24 120 2.00 0.9 0.293 0.34 0.25 0.04 0.04 25 125 2 08 0.8 0.260 0.34 0.22 0.04 0.04 26 130 2.17 0.9 0.293 0.34 0.25 0.04 0.04 27 135 225 0.9 0.293 0.34 0.25 0.04 0.04 28 140 2.33 0.9 0.293 0.34 0.25 0.04 0.04 29 145 2.42 0.9 0.293 0.34 i 0.25 0.04 0.04 30 150 2.50 0.9 0.293 0.34 1 0.25 0.04 0.04 31 155 2.58 0.9 0 293 0 34 0.25 0.04 0.04 32 160 2.67 0.9 0.293 0.34 0.25 0.04 0.04 33 165 2.75 10 0.325 0.34 0.28 0.05 0.04 34 170 2.83 1.0 0.325 0.34 0.28 0.05 0.04 35 175 2.92 1.0 0.325 0.34 0.28 0.05 0.04 36 180 3.00 1 0 0.325 0 34 0.28 0.05 0.04 37 185 3.08 1.0 0.325 0.34 0.28 0.05 0.04 38 190 3.17 1.1 0.358 0.34 0.30 0 02 0.01 39 195 3.25 1,1 0.358 0.34 0.30 0.02 0.01 40 200 3.33 1.1 0.358 0 34 0.30 0.02 0.01 41 205 3.42 1.2 0.390 0.34 0.33 0.05 0.04 42 210 3.50 1.3 0.423 0.34 0.36 0.08 0.07 43 215 3.58 1.4 0.455 0.34 0.39 011 0.10 44 220 3.67 1.4 0.455 0.34 0.39 0.11 0.10 45 225 3.75 1.5 _ _ 0.488 0.34 0.41 0 15 0.13 46 230 3.83 1.5 0 488 0.34 0.41 0.15 1 0.13 47 235 3.92 1.6 0.520 0.34 0.44 0.18 i 0.16 48 240 4.00 1.6 0.520 0.34 0.44 0.18 0.16 49 245 4.08 1.7 0.553 0.34 0.47 0.21 0.19 50 250 4.17 1.8 0.585 0.34 0 50 0.24 0.22 Plate E-2,2 6 -Hour Storm Page 6 of 9 RCFC & WCD IM7192' CMCMU klA4"1LNV4:ILS SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 6-HOUR STORM (PROJECT: OWENS RESIDENCE ~ Job No.: 1684 DATE IBY: SMS 12/23/15 UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM I3RAINAGE AREA-ACRES 0.91 UNIT TIME-MINUTES 5 LAG TIME - MINUTES 0.33 UNIT TIME-PERCENT OF LAG 1503.5 TOTAL ADJUSTED STORM RAIN-INCHES 2.71 CONSTANT LOSS RATE-in/hr 0.342 LOW LOSS RATE - PERCENT 85% Unit Time Period Time Minutes Hours Pattern Percent (Plate E-5.9) Storm Rain in/hr Loss Rate in hr Max Low Effective Rain in/hr Flood Hydrograph Flow cfs 51 255 4.25 1.9 0.618 0.34 0.53 0.28 0.25 52 260 4.33 2.0 0.650 0.34 0.55 0.31 0.28 53 265 4.42 21 0.683 0.34 0.58 0.34 0.31 54 270 4.50 2.1 0.683 0.34 0 58 0.34 0.31 55 275 4 58 2.2 0.715 0 34 0.61 0.37 0.34 56 280 4.67 2.3 0 748 0 34 0.64 0.41 0.37 57 285 4.75 2 4 0.780 0 34 0.66 0.44 0.40 58 290 4.83 2.4 0.780 0.34 0.66 0.44 0.40 59 295 4.92 2.5 0.813 0.34 0.69 0.47 0 43 60 300 5.00 2.6 0.846 0.34 0.72 0.50 0.46 61 305 5.08 3.1 1.008 0.34 0.86 0.67 0.61 62 310 5.17 3.6 1.171 0.34 1.00 0.83 0.76 63 315 5.25 3.9 1.268 0.34 1.08 0.93 0.85 64 320 5,33 4.2 1 366 0.34 1.16 1.02 0.94 65 325 5.42 4.7 1.528 0.34 1.30 1.19 1.09 66 330 5.50 5.6 1.821 0.34 1.55 1.48 1.36 67 335 5.58 1,9 0.618 0,34 _ 0.53 028 0.25 68 340 5.67 0.9 0.293 0.34 0 25 0.04 0.04 69 345 5.75 0.6 0.195 0.34 0.17 0.03 0.03 70 350 5 83 0.5 0.163 0.34 0.14 0.02 0.02 71 355 5.92 0.3 0.098 0.34 0.08 0.01 0.01 72 360 6.00 0.2 0.065 0 34 0.06 0.01 0.01 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY EFFECTIVE RAIN (in) FLOOD VOLUME (acft) FLOOD VOLUME (cuft) PEAK FLOW RATE (cfs) 1 11 0.08 3,681 1.36 Plate E-2.2 6 -Hour Storm Page 7 of 9 RCFC & WCD U"i VIDp©d0g17 GyIA °I,bJL°,L, SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM PROJECT: OWENS RESIDENCE Job No.: 1684 DATE: 13Y: SMS 12/23/15 UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM DRAINAGE AREA-ACRES 0.910 UNIT TIME-MINUTES 15 LAG TIME - MINUTES 0.33 UNIT TIME-PERCENT OF LAG 4510.5 TOTAL ADJUSTED STORM RAIN-INCHES 4 35 CONSTANT LOSS RATE-in/hr n/a VARIABLE LOSS RATE (AVG) in/hr 0.3415 IMINIMUM LOSS RATE (for var. loss) - in/hr 0.171 LOW LOSS RATE - DECIMAL 0.85 C 0.00316 Unit Time Period Time Minutes Hours Pattern Percent (Plate E-5 9) Storm Rain in/hr Loss Rate in/hr Max Low Effective Rain in/hr Flood Hydrograph Flow cfs 1 _15 0.25 0.2 0.035 0.603 0 030 0.005 0 00 2 30 0.50 0.3 0.052 0.596 0.044 0 008 0.01 3 45 0.75 0.3 0.052 0.589 0 044 0 008 0.01 4 60 100 0.4 0.070 0.582 0.059 0.010 0.01 5 75 1.25 0.3 0.052 0.575__ _0.044 0,008 0.01 6 90 1 50 0.3 0.052 0.569 0 044 0.008 0.01 7 105 1.75 0.3 0.052 0.562 0.044 0.008 0.01 8 120 2.00 0.4 0.070 0.555 0.059 0.010 0.01 9 135 2.25 0.4 0.070 0 548 0.059 0.010 0 01 10 150 2.50 0.4 0.070 0.542 0.059 0.010 0.01 11 165 2.75 0.5 0.087 0.535 0.074 0.013 0.01 12 180 3.00 0.5 0.087 0.528 0.074 0.013 0.01 13 195 3,25 05 0.087 0.522 0.074 0.013 0.01 14 210 3 50 0.5 0.087 0.515 0.074 0.013 0.01 15 225 3.75 0.5 0.067 0.509 0.074 0.013 0 01 16 240 4,00 0.6 0,104 0.503 0.069 0.016 0.01 17 255 4.25 0.6 0.104 0.496 0.059 0.016 0.01 18 270 4.50 0.7 0.122 0.490 0.104 0 018 0.02 19 285 4.75 0.7 0 122 0.484 0 104 _0.018 0.02 20 300 5.00 0.8 0.139 _ _ 0.477 0 118 0.021 0.02 21 315 5.25 0.6 0.104 0.471 0.089 0.016 0.01 22 330 5.50 0.7 0.122 0.465 0.104 0.018 0.02 23 345 5.75 0.6 0139 0.459 0.118 0.021 0.02 24 360 6.00 0.8 0.139 0.453 0,118 ' 0 021 0.02 25 375 6.25 0 9 0 157 0.447 0.133 0 023 0.02 26 390 6.50 0 9 0.157 0,441 0.133 0.023 0.02 27 405 6.75 1.0 0.174 0.435 0148 0.026 0.02 28 420 7.00 1.0 0 174 0.429 0.148 0 026 0.02 29 435 7.25 1.00 .174 0.423 0148 0.026 0.02 30 450 7 50 1.1 0 191 0.417 0.163 0.029 0 03 31 465 7.75 1.2 0.209 0.412 0.177 0.031 0.03 32 480 8.00 1,3 0.226 0.406 0.192 0.034 0.03 33 495 8.25 1.5 0.261 0.400 0.222 0 039 0.04 r 34 510 8.50 1.5 0.261 0.395 L 0.222 0.039 0.04 35 525 8.75 1.6 0.278 _ _ 0.389 0.237 0.042 0.04 36 540 9.00 1.7 0 296 0.384 0.251 0.044 0.04 37 555 _9.25 1.9 0.331 0.378 0.281 0.050 0.05 36 570 9.50 2,0 0.348 0.373 0.296 0.052 0.05 39 585 9.75 2.1 0.365 0.368 0.311 0.055 _ 0.05 40 600 10.00 2.2 0.383 0.362 0.325 0.020 0.02 41 615 10.25 1,5 0.261 0.357 0.222 0.039 0.04 42 630 10.50 1.5 0.261 0.352 _ _ 0.222 0 039 0.04 43 645 10,75 2.0 0.348 0.347 0.296 0.001 0.00 44 660 11.00 2.0 0.345 0,342 0.296 0.006 0.01 45 675 11.25 1.9 0.331 0.337 0 281 0.050 0.05 46 690 11.50 1.9 0.331 0.332 0.281 0.050 0.05 47 705 11.75 1.7 0.296 0.327 0.251 0.044 _0.04 48 720 12.00 1.8 0.313 0.322 0.266 0.047 0 04 49 735 12.25 2.5 0.435 0.317 0.370 0.116 0.11 50 750 12,50 _ 2.6 0.452 0.312 0.385 0.140 0.13 51 765 12.75 2.8 0.487 0.308 0.414 0.179 016 52 780 13 00 2.9 0.505 0.303 0,429 0.201 0.18 53 795 13.25 3.4 0.592 0.299 0.503 0.293 0 27 64 810 13.50 3.4 0.592 0.294 0.503 0.298 0.27 55 825 13.75 2.3 0.400 0.290 0.340 0.111 0.10 56 840 14.00 2.3 0.400 0.285 0.340 0.115 011 57 855 14.25 2.7 0.470 0.281 0.399 0.189 0.17 58 870 14.50 2.6 0.452 0.277 0.385 0.176 0.16 59 585 14.75 2.5 0.452 0.272 0.385 0.180 0.17 60 900 15.00 2.5 0.435 0.268 0.370 0.167 015 61 915 15.25 2.4 0 418 0.264 0.355 0.154 0.14 Plate E-2.2 24 Hour Storm Page 8 of 9 RCFC & WCD G{]1`7DGOO I OO I2V AAAI°.b JLR= SYNTHETIC UNIT HYDROGRAPH METHOD SHORTCUT METHOD 24-HOUR STORM PROJECT: OWENS RESIDENCE Job No.: 1684 DATE: BY: SMS 12/23/15 UNIT HYDROGRAPH and EFFECTIVE RAIN CALCULATION FORM (DRAINAGE AREA -ACRES 0.910 UNIT TIME -MINUTES 15 !LAG TIME - MINUTES 0 33 UNIT TIME -PERCENT OF LAG 4510.5 TOTAL ADJUSTED STORM RAIN -INCHES 4.35 CONSTANT LOSS RATE-in/hr n/a VARIABLE LOSS RATE (AVG) in/hr 0.3415 MINIMUM LOSS RATE (for var. loss) - in/hr 0.171 LOW LOSS RATE - DECIMAL 0.85 C 0.00316 Unit Time Period Time Minutes Hours Pattern Percent (Plate E-5.91 Storm Rain in/hr Loss Rate in/hr Effective Rain Flood Hydrograph Flow cfs Max Low in/hr 62 930 15.50 2.3 0.400 0.260 0.340 0.140 0.13 63 945 15.75 19 0.331 0.256 0,281 0.075 0.07 64 960 16.00 1.9 0.331 0.252 0.281 0.079 0 07 65 975 16.25 0.4 0,070 0.248 0.059 0.010 0.01 66 990 16.50 0.4 0.070 0.244 0.059 0.010 0 01 67 1005 16,75 0.3 0,052 0 241 0.044 0 008 0,01 68 1020 17.00 _ 0.3 0.052 0.237 0,044 0.008 0.01 69 1035 17.25 0.5 0.087 0.234 0.074 0.013 0.01 70 1050 17.50 0.5 0.087 0.230 0.074 0.013 0.01 71 1065 17.75 0.5 0.087 0.227 0.074 0.013 0.01 72 1080 18.00 0.4 0.070 0.223 0.059 0.010 0.01 73 1095 18.25 0.4 0.070 0.220 0.059 0.010 0.01 74 1110 18.50 0.4 0,070 0.217 0 059 0.010 0.01 75 1125 18.75 0 3 0.052 0.214 0.044 0.008 0.01 76 1140 19,00 0.2 0,035 0.211 0.030 0 005 0.00 77 1155 19.25 0.3 0.052 0.208 0,044 • 0.008 0 01 78 1170 19.50 0.4 0.070 0.205 0.059 0 010 0.01 79 1185 19.75 0.3 0.052 0.202 0.044 0.008 0.01 80 1200 20.00 0.2 0.035 0.199 0.030 0.005 0.00 81 1215 20.25 0.3 0.052 0,197 0 044 0.008 0.01 82 1230 20.50 0.3 0.052 0.194 0.044 0.008 0.01 83 1245 20.75 0.3 0,052 0,192 0 044 0.008 0.01 84 1260 2100 0.2 0.035 0.189 0.030 0.005 0.00 85 1275 21.25 0.3 0.052 0.187 0 044 0.008 0.01 86 1290 21.50 0.2 0.035 0.185 0.030 0 005 0.00 87 1305 21.75 0.3 0.052 0.183 0.044 0.008 a 0.01 88 1320 22.00 0,2 0.035 0:181 0.030 0.005 0.00 89 1335 22.25 0.3 0.052 0.179 0.044 0 008 0.01 90 1350 22,50 0.2 0 035 0.177 0.030 0.005 0.00 91 1365 22.75 0.2 0.035 0.176 0.030 0.005 0.00 92 1380 23,00 0.2 0 035 0.175 0.030 _ 0.005 0.00 93 1395 23.25 0.2 0.035 0.173 0.030 0.005 0.00 94 1410 23.50 0 2 0.035 0.172 0 030 0.005 0.00 95 1425 23 75 0.2 0.035 0.171 0.030 0.005 0.00 96 1440 24 00 0.2 0.035 0 171 0.030 0.005 0.00 EFFECTIVE RAIN & FLOOD VOLUMES SUMMARY EFFECTIVE RAIN (in) FLOOD VOLUME (acft) FLOOD VOLUME (cuft) PEAK FLOW (cfs) 1.00 0.08 3,317 027 Plate E-2,2 24 Hour Storm Page 9 of 9 PROJECT NAME: OWENS RESIDENCE JOB #: 1684 DATE: December 23, 2015 CONIC METHOD WHERE: V= 3(E,-EZ)(A,+ A2 + JA,A2) BASIN Al BASIN CHARACTERISTICS CONTOUR ELEVATION DEPTH INCR TOTAL (ft) (ft) AREA INCR TOTAL (sf) (sf) VOLUME INCR TOTAL (cuft) (cuft) (acre -ft) 99 0 0.00 1.063 0 0 0.00 100 1 1.00 1,028 2.091 1.548 1,548 0.04 102 1 2.00 2,843 12, 005 10,552 17,550 0.40 BASIN A2 BASIN CHARACTERISTICS CONTOUR ELEVATION DEPTH INCR TOTAL (ft) (ft) AREA INCR TOTAL (sf) (sf) VOLUME INCR TOTAL (cuft) (cuft) (acre -ft) 100 0 0.00 5,038 0 0 0.00 101 1 1.00 4,124 9,162 6,998 6,998 0.16 102 1 2.00 2,843 12, 005 10,552 17,550 0.40 TOTAL VOLUME PROVIDED 19,098 cu -ft 0.44 ac -ft 102 _ P00 RETENTION BASIN 100 P. A-O.34 - "la .99 RETENTION BASIN X1.00 103 MOUNTAIN VIEW LANE 40' NI INI SCALE 1"=40' 80' LEGEND DRAINAGE FLOW TRIBUTARY AREA DRAINAGE SUB- AREA (AC) LAND USE BOUNDARY AREA ID LEGEND HARDSCAPE (IMPERVIOUS AREA) BUILDINGS (IMPERVIOUS AREA) ROCK (IMPERVIOUS AREA) LANDSCAPED AREA Al A-1.12 J DRAINAGE AREA Al PROPOSED LAND USE SUMMARY LAND USE AREA (acres) RI NUMBER AMC II INFILTRATION RATE (in/hr) IMPERVIOUS PERCENT BUILDINGS/PAVING/HARDSCAPE 0.14 56 0.51 100.0 OPEN SPACE 0.20 56 0.51 10.0 TOTAL AREA 0.34 0.60 STORM EVENT SUMMARY PROPOSED CONDITIONS DURATION 1 -HOUR 3 -HOUR 6 -HOUR 24-HOUR EFFECTIVE RAIN (in) 1.07 1.22 1.23 1.17 FLOOD VOLUME (cu -ft) (acre -ft) 1,316 0.03 1,502 0.03 1,513 0.03 1,439 0.03 PEAK FLOW (cfs) N/A 0.60 0.52 0.12 RETENTION BAS N Al VOLUME SUMMARY CONTOUR ELEVATION (ft) BASIN DEPTH (ft) CONTOUR AREA (sf) TOTAL VOLUME (cu -ft) (acre -ft) 99 0.0 1,063 0.00 0.00 100 1.0 2,091 1,548 0.04 DRAINAGE AREA A2 PROPOSED LAND USE SUMMARY LAND USE AREA (acres) RI NUMBER AMC II INFILTRATION RATE (in/hr) IMPERVIOUS PERCENT BUILDINGS/PAVING/HARDSCAPE 0.27 56 0.51 100.0 OPEN SPACE 0.64 56 0.51 10.0 TOTAL AREA 0.91 1.56 STORM EVENT SUMMARY PROPOSED CONDITIONS DURATION 1 -HOUR 3 -HOUR 6 -HOUR 124 -HOUR EFFECTIVE RAIN (in) 1.02 1.09 1.11 1.00 FLOOD VOLUME (cu -ft) (acre -ft) 3,364 0.08 3,611 0.08 3,681 0.08 3,317 0.08 PEAK FLOW fs) N/A 1.56 1.36 0.27 RETENTION BASIN A2 VOLUME SUMMARY CONTOUR ELEVATION (ft) BASIN DEPTH (ft) CONTOUR AREA (sf) TOTAL VOLUME (cu -ft) (acre -ft) 100 0.0 5,038 0.00 0.00 101 1.0 9,162 6,998 0.16 102 2.0 12,005 17,550 0.40 Date: 12/23/2015 M- W 2 X W 1- z 0 1- > W 1 H z 0 0 OC "W'