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24230, q230 --_--�` 54 , q230 r r ...- - ' � ��:' ` ]►;,�� it „� • , m i I t �I HYDROLOGIC AND HYDRAULIC ANALYSIS LAKE LA QUINTA TENTATIVE TRACT NO. 24230 LA QUINTA, CALIFORNIA UPDATED NOVEMBER, 1989 AUGUST, 1989 ,, �jV ESS /Q S. S F� s w h 264D rr" civic 9TF OF CA��F�� ,ESP 3�3i%9Z Prepared for: A.G. Spanos Construction, Inc. 9449 Friars Road San Diego, California. 92108 Prepared by: Mainiero Smith /Spiska Engineering a Joint Venture 777 East Tahquitz Way, Suite 301 Palm Springs, California 92262 (619) 320 -9811 TABLE OF CONTENTS A. Project Description B. Hydrology C. On -site Drainage System D.. Off -site Drainage System E. Conclusions and Recommendations Appendix PAGE 1 2 4 7 9 I Rational Method Computations of On -site Storm Runoff - 10 Year Storm II Rational Method Computations of On -site Storm Runoff - 100 Year Storm III Computations for Lake Storage Requirements, Catch Basin Sizing, Pipe Sizing and Swale Capacity IV Rational Method Computations of Off -site Storm Runoff r LIST OF FIGURES FIGURE NO FOLLOWING PAGE: 1. Vicinity Map 1 2. Soil Conservation Service Soils Map 1 3. Portion of F.I.R.M. Panel 2260A :3 4. Runoff Coefficient Curve - Soil Group B 3 5. Intensity - Duration Curve Calculation Sheet 3 6. Time of Concentration Nomograph 3 7. Rainfall Depth Calculation Sheet 3 B. Rainfall Patterns in Percent 3 9. 100 -Year, 24 -Hour Hydrograph 3 I PROJECT DESCRIPTION The proposed development will consist of 281 single - family i residential sites, 10.1 acres of multi - family units and 2.0.4 acres of commercial use on approximately 151 acres. The project s is located in the southeast one quarter of Section 30, T.5S., I R.7E.11 S.B.B.M., in the City of La Quinta, California. It is i I bounded on. the west by Washington Street, on the north by 47th Avenue, on the east by Adams Street, and on the south by 48th Avenue. Figure 1 is a vicinity map showing the project location. Soils at the project site are primarily sand and sandy loam in nature, and have a low to moderate potential for runoff. A soils map, Figure 2, has been taken from the. Soil Survey of Riverside County, California Coachella Valley Area, as prepared .by the Soil Conservation Service, and included for reference. t For the purposes of this analysis, a uniform soil grouping of B has been selected. In its approval of Tentative Tract No. 24230, the City of.La Quinta imposed a condition that the project retain 100 -year storm drainage on -site and /or construct a piped drainage t: system to the La Quinta Evacuation Channel,. including street ( drainage flow from the adjacent one -half width street sections i adjacent to the project. The proposed drainage plan meets this I� condition for Basins A through T and Basin V. Runoff from Basin U, which is tributary to the proposed low point in 48th Avenue will be conveyed to The Pyramids for storage and infiltration. 1 77 74 V-11 ndian Wells \Z-.) co .?Pout'" PP' 80 C> ...... 0 F ....... ........ . ..J . . .... .... . .. ... .............. -p irai-pr 38 V TOJECT sitt ••U I ............ 0 Trailer NUK .... MVIP ............ :::td n *GMA 0 C) �j ..... ............. ..................... .......... all NUE 3 Q 32 C, INI --;I ;4". 5NII Ir C) ........ • :• ;;t11.. G Q: '� .; T�: I1L� 1 II.,::�:.: .. a vo der a so:% • W te Well., 0:4 IZ A VEAIUEj' Well DESIGN BY PREPARED UNDER DIRECT SUPERVISION OF JOB NO. MeNero, Srolth/Splaka Engineer DRAWNSY SIGNATURE R.C.E. NO. SHEET_ Ma CHECKED iq-- I\At-�.'-p OF DATE —SHEETS I ,I .'l. o." -•� y. �I \ - = .vii(: �`•� _,-; •`; • � —�l`,h�YprKM ,.Y�, •s`� mil; • - • ,f r'- • „f - ~_4i. •1', . iar��'• '4� ''.�W�iy 9 � LI.'.' Of.'./• _ yr, rr '::.''” -.., ;. •`•i � I� ��I . t — , s' r..' ,; j. -� � li• — {{a i �. IL•` ©f,�; t,' i�l I �Ici;;�,., — I— _f i Ii [ 'S.,t4 iJyY'V',.•' I - ?� ,� Y• �Lil \,���YClI�iS)ftl�� —,.•R��I����.111"® I�� _ }'1� � �'civr�'' _��• ff�77 !)f ;' \� I . -:'� '- �:.i� -. ���t;l�.•�.- ca. :�'�nMAIIJ.i,�yA :t Ih �•� "�� ,: 77k. cluill • t HYDROLOGY The Flood Insurance Rate Map (FIRM), prepared by the Federal Emergency Management Agency for unincorporated portions of f Riverside County designate the project site as Zone C. Zone C r designation indicates that the site .will be free of inundation from off -site sources during a 100 -year runoff event. A copy of r a -portion of FIRM Panel 2260A is included as Figure 3 for reference. The Riverside County Flood Control and Water Conservation District (RCFC & WCD) Hydrology Manual has been used as the basis of this analysis and report. The project site was divided into basins and sub - basins, as shown on the Drainage Plan, based on �I seventeen points at which runoff could conveniently be t transported to the - drywells for infiltration or to the. lake for storage. The Rational Method was used to determine the peak runoff for both the 10 year and the 100 year storm event for each sub -basin and basin. Values for C for each type of development were taken from D -5.2 of the Manual, which has been included as Figure 4 for reference. None of the tabulated intensity charts ' 'of Plate D -4.1 are applicable to this project. Therefore, a set of intensity- duration curves was prepared on Plate D -4.7 of the �( Manual for use in the analysis and is included as Figure 5. 2 The 24 hour duration storm has been used as the basis for i t. . determination of required storage volume for both the 10 -year and i the 100 -year event. The 100 -year rainfall depth,was taken from , Plate. E -5.6 of the Manual.. The 10 -year rainfall depth was determined using Plate E -5.7 and the data on Plates E -5.5 and E- r ( 5.6. Figure 7 shows the results of that determination. The time distribution of the rainfall during a 24 -hour storm has been taken from Plate E -5.9 of the Manual which tabulates the percentage of the total 24 -hour rainfall volume by increments of time. The percentages have been plotted in Figure 9 to produce a hydrograph of the 24 hour storm. This hydrograph shape is t equally valid for both 100 -year and the 10 -year storm events. This hydrograph has been used to determine required lake storage volumes and to determine the volume of water to be released to �. The Pyramids. As a matter of convenience, Plates D -5.5 and D -5.7 of the Manual have been used to determine street flow depth and ! velocity. While these plates vary slightly from the actual proposed street cross - sections, they produce conservative results. 1 ( 3 j� uuuL--,� 'I I i . ails UDED f f JI I 1 \ .l' i F I M Z Prz.a,e:c-T S Z `� AV ZONE A EC ZONE C 0 a 0 w ty of Indi AREA NOT INCLUDED ZONE C: DNE A-;� City of Indio AREA NOT INCLUDED ZONE CU of A EA INCLU J a �F b 2 O 0 cc Z LL U. ty of Indi AREA NOT INCLUDED ZONE C: DNE A-;� City of Indio AREA NOT INCLUDED ZONE CU of A EA INCLU ■muff.m1 MENIIM1 ■ENFIN1 ■ommal ■■ff.■ ■1 ■■ /1■ ■1 ■M11■ ■I ■EMEW ■■ ■ ■II ■llmord ■11M■III M'IMAI ■1 i /ERM1 ■Effi ■1 FINE /INI II■NIFIM1 .Imuma1 /NN OM1 ■mffImm1 ■o11■ ■1 ■■IAMMI ON ■■ ■1 ■11■ ■II■ MIME ��n f 1 r t t I t i ) ( 1 L 1000 TC' . 100. 90 LIMITATIONS: 1. Maximum length =1000' 2. Maximum area = 10 Acres C 3 900 130 70 /6 800 ... c� Q� v O u 60 6 700 L It Zoo 7 O M o iV O c m Ea 0 E 50 so .. ° o 8 o V500 SO c �p / E .00 30 m c 0 ° c 20 $ 9 0 0 35 il) a 0 & s a 10 A 'E ® = 6 tr' 400 30 K AL C Undaveleped Good Cover 0 2 350 25- d a X0 . C Fair Cover .-. 300 0 :� 2 c 29 Poor Geyer � ,2 116 I7 Single //Faamily 50 2 230 6- 16 Acre) c Is - Canrnercia c 14 % 0 200 Q.- 13 o J 12 8 11 ° 25 m KEY 150 9 L- H- Tc -K -Tc o 30 EXAMPLE: .E / 7 (1) L =550'9.H =5.0, K = Single Family(1 /4 Ac.) 35 Development , Te =12.6 min. as (2) L 5150, H =5.01 K = Commercial !00 Development, Tc = 9.7 min. . 40 3 t- 4 Reference: Bibliography item No. 35. R C FC W C O TIME OF CONCENTS Hymoww MANUAL PLATE D -3 I i i { r I { t. I' I i 15 14 15 14 13 12 13 12 11 11 10 Cn 10 9 U z 9 z 5 T a w ° s J J Cr- 4 3 s 7 - s 4 3 Pool i 2 2 l i 0 0 2 5 10 25 50 100 RETURN PERIOD IN YEARS NOTE: I. For intermediate return periods plot 2-yaw and 100 -year values from maps for a specific duration, then connect points and reed value for desired return period. For example given 2 -year 24 -hour = 3.50 and 100 -year 24 -hour =10.40 , 25-year 24 -hour = T.80 Reforeace:ftOAA Atlas 2,Vaiume =- California,1973. RAINFALL DEPTH VERSUS "RUC"' &WOD RETURN . PERIOD FOR HYDROLOGY MANUAL PARTIAL DURATION SERIES PLATE E-5.T v r m M I co i0 r K 0 RAINFALL PATTERNS IN PERCENT i 24-HOUR STORM 71ME S -MIN TIME 1S�MIN 70 -M[N 60 ;MIN TIME Ul PERIOD PERIOD 3 -HOUR STORM PERIOD 6 -HOUR MMIN PEPl00. STOF 1.7 1 .2 .S 1.2 49 2.S SO 1.0 2 .7 .7 1.7 59 TIME PERIOD 5-MIN PERIOD 10 -MIN PERIOD 15 -14IN PERIOD 30 -MIN PERIOD TIME PERIOD 5-MIN PERIOD I MIN PERIOD IS -MIN PERI00 30 -M(N PERIOD 2.0 .4 1 1.3 L.0 ].7 0.S 1 .S 1.1 l.7 3.6 ,> 57 ! I.] 1.1 2.0 3.3 4.0 5.1 10.0 17.9 2 3 .6 1.2 1.3 l.9 2.1 4.7 4.B ?.2 7 ] 1.0 ].0 5S 2.3 56 .6 0 .4 1.1 C 56 4 1.5 3.] 4.0 17.6 0 .6 1.4 2.2 6.9 2.5 11 S 1•5 7.! 6.6 Lp.9 S .6 1.6 !.4 S.3 TJ 0 1.0 3.6 1.3 26•] 6 .1 1.5 2.6 S.a r- 16 7 t.S 4.4 0.6 2.] 7 .1 1,6 2.6 6.0 10.♦ 67 0 1.0 4.2 9.0 •6 0 .7 1.6 2.3 0.0 4,7 lT 9 1.0 S.3 12.3 .• 9 .7 1.6 2,6 11.6 1.9 - 10 .1.5 4.1 17.6 .1 l0 .1 1.0 2.7 16.6 20 11 1.6 6.6 16.1 .3 11 .1 1.6 2.0 25.1 I,l 69 l2 1.0 S.9 4.2 ./ 12 .a I,T 3.0 4.4 ' 27 1] !.L 1.] 11 .S 17 .BI .T ].2 3.4 .0 12 1• !.! O.S 2S .9 14 .0 1•a 3.6 26 IS 2.! 16.1 14 •6 IS .0 1.0 4.3 6.0 75 16 !.0 16.1 20 1.0 16 .0 1.0 4.1 29 11 x.e 1.s 17 .] It .a 2.0 s.4. S.1 10 is 2.1 2.6 71 1.2 10 .0 2.0 6.2 3 2 19 2.4 00 .2 19 .G 2.1 6.9 .0 O1 20 2./ 34 1, 20 •0 2.2 7.S - 's 21 3.3 03 .3 21 .0 2.5 10.6 .9 04 . E2 7.1 37 1.9 22 .0 2.0 16.5 38 23 2.9 06 .2 23 .0 3.B 7.6 .7 01 24 ]..0 60 2.2 24 .9 3.2 1.0 41 25 3.1 a9 .7 2S .0 3.5 1.S .S 90 16 4.2 - 63 2.0 26 .9 3.9 .2 - 44 27 5.0 92 •2 21 .9 4.2 l.9 .S q] 20 ].s ' 46 1.9 20 .9 6.4 .2 47 29 6.a 95 .2 29 .9 4.0 1.0 .6 M 31 3 3' ]1 0.2 31 ,9 6.7 ' 32 S:9 32 .9 0.1 33 2.0 33 1.0 10.] 36 1.0 ]4 1.0 2.0 3S 1.0 ]s 1.0' 1.1'� ]6 •6 76 1.0 .5 ]1 1.9 P- 3a 1.1 r 39 1.1 40 •1 1.1 1.2 �0 42 1.3 4/ 43 1.4 44 1.4 44 1.5 46 1.1 J �I 60 1.6 tM 24-HOUR STORM 71ME S -MIN TIME 1S�MIN 70 -M[N 60 ;MIN TIME PERIOD PERIOD PERIOD PERIOD PERIOD PERt00 PERIOD MMIN PEPl00. 4p 1.7 1 .2 .S 1.2 49 2.S SO 1.0 2 .7 .7 1.7 59 2.0 SI 1.p ] .3 .6 1.0 51 2.0 52 2.0 .4 .4 .7 2.1 S2 2.9 53 2.1 5 .3 .0 2.0 57 7.6 56 2.1 6 .3 1.0 2.9 S6 3.4 ss ?.2 7 .] 1.0 ].0 5S 2.3 56 2.3 0 .4 1.1 4.6 56 2.3 51 56 2.6 2.4 9 10 .4 .4 1.7 1.3 6.3 0.2 51 50 2.7 2.6 59 2.5 11 •S 1.1 1.0 S9 2.6 12 ,S 1.6 TJ 25 61 3.1 17 .S 1.0 I0.0 '61 2 .60 4 62 7.0 16 :S 2.0 11.4 62 2.] is .s 2,1 10.♦ 67 1.9 66 ♦.2 10 •6 2.S 0.5 66 1.9 6S 4,7 lT .6 3.a l,♦ 6S .• 66 4,6' 1a .7 7.7 1.9 60 •4 67 l.9 19 .1 3.9 1.3 67 .7 60 20 .0 4.3 1.2 66 .3 69 .9 21 •6 ].0 I,l 69 .S 70 .0 ,S 22 ./ 4.0 1.0 10' .5 7l .] 27 .0 ].0 .9 11 .S 12 •2 24 ,0 3.4 .0 12 2S .9 S.1 13 ,4 26 .9 1.1 14 •6 21 1.0 6.0 75 .] 20 1.0 4.6 16 .! 29 1.0 5.] 17 .] 30 l.t S.1 10 .4 71 1.2 4.7 19 ' 3 3 2 1.] / ].0 00 .2 ]] I.S .0 O1 .7 34 1, .6 02 .3 's 1 6 1.0 03 .3 36 1.7 .9 04 .2 37 1.9 .0 as .3 38 2.0 .S' 06 .2 ]9 2.I .7 01 .3 60 2.2 .s 0a .2 41 I.1 .6 a9 .7 42 1.S .S 90 .2 - 63 2.0 .S 91 .2 44 2.0 .S 92 •2 es l.9 .S q] ,2 ' 46 1.9 .6 94 .2 47 1.1 .4 95 .2 40 1.0 .6 96 .2 NOTES: I. 3 and 6 -hour patterns based on the Indio area thunderstorm of September 24,1939. 2.'24-hour patterns based on the general storm of March 2 & 3,1938. t i Mainiero, Smith /Spiska Engineerin A J O I N T V E N T U R CIVIL LAND DEVELOPMENT, AND ENVIRONMENTAL ENGINEERING • SURVEVI 4DIP Bank of Palm Springs Centre 777 East Tahquit: Telephone (619) 320 -9811 / FAX (619) 323 -781 Way SUBDIVISION_ LAIC L.A QLJIh1TA., PROJECT SUBJECT Y2 - 2¢ N2 1�Yt�R.oG2AP>a - Pu=; f ED FaciA Pv-aTE S - 5.9 .... ::. . lli f' 0 2 01 2 Z l O d) .�...,_..- .......... __... _... -V ..:._ ..._._.— ,- ........ - , .....- _•.- __.. -_.. �`:. =.: '. .. ... _..... ,- ..,..._, �...- ..._.......e »..... ....... . ... . .. � lli f' 0 2 01 2 Z l O d) ON-SITE-DRAINAGE SYSTEM iIn accordance with the requirements of the City of La Quinta, all storm runoff generated+ within the project boundary i will be retained on -site, with the exception of Basin U which will be conveyed to The Pyramids for storage and infiltration. The project site will be graded to direct storm runoff generated in Basins A through T to the proposed lake. Runoff iwill be collected to the streets by overland flow and routed to low points created along Avenida Del Lago and.in each cul -de -sac. t� An interceptor with a grated opening will be located in the flowline of the curb and gutter. Low flows (car wash and lawn- watering) will enter the interceptor and be infiltrated by the drywell. Where the sidewalk is detached, flows that exceed the capacity of the drywell will flow over a depressed section of curb and along a swale to the lake for storage. The sidewalk �+ will also be.depressed to pass the flows. Where the sidewalk is I attached to the curb, flows in excess of drywell capacity will pass through an under- sidewalk drain to the swale. The t interceptor will remove debris and gravel from the runoff prior to the. drywell unit. When flows exceed the capacity of the drywell unit, runoff will be diverted to the lake-via a swale for temporary storage. The pipe connecting the interceptor to the lake will be sloped to drain from the lake to the interceptor to 4 return stored runoff for infiltration and to prevent stagnant water from standing in the overflow structure. The. interceptor and drywell units will be located in or-immediately behind the attached sidewalk to facilitate access for maintenance. i The drywell units to be incorporated into the project will be the Maxwell IV units, as designed and constructed by McGuckin I Drilling, Inc. of Phoenix, Arizona. These units, which incorporate a deep (20 -100 feet) rock - filled sump, are capable of infiltration rates in the project area of from 0.5 to 3.0 cfs, according to McGuckin representatives. For the purpose of this f report, an infiltration rate of 0.5 cfs has been selected. ,t The runoff from a 100 -year storm. event will follow the same i path as the 10 -year runoff to the curb inlets. Runoff will follow a swale to the lake, where it will be stored for later E infiltration at the'drywells. ( The lake has been sized and graded to provide storage for E 100% of the anticipated runoff from a 100 -year storm. Such an event would-produce about 37.28 acre feet of water which would i raise the lake surface 1.55 feet. It is important to remember that this only occurs if there is no infiltration at any of the seventeen drywells. Assuming normal operation at.a minimum rate of 0.50 cfs per drywell, the lake surface would, rise about b.95 feet. This storage volume would be released through infiltration over a period of about 30 hours after the end of the storm. All of the house pads around the lake have been graded to.be at least 5 2.0 feet above the maximum water surface elevation, with no allowance for infiltration. In addition, Vista Del Lago has been r graded to provide an emergency spillway to the exterior of the project below the lowest pad elevation for runoff from storms which greatly exceed the 100 -year frequency. ( Basins V -1 and V -2, which are located along Washington i Street, could not be graded to drain to the lake due to the very flat existing street grades. Washington Street will be graded to two low points, located near the center of each sub - basin. Water will be taken off the street by a curb opening and stored in a I depression located in the 20' landscape setback adjacent to Washington Street. A drywell unit will be placed in each depression to provide.infiltration. Complete calculations and details of this system will be prepared and provided as a part of the design package for Washington Street. I 6 (i: r r OFF -SITE DRAINAGE SYSTEM As previously noted, the City conditioned approval of the Tentative Map on either retaining storm drainage on -site in the lake 'or providing a piped system to the Evacuation Channel. This j requirement included street drainage flow from the one -half width (. street sections adjacent to the project. As shown on the Drainage Plan, this condition has been met for all of Washington r Street and 47th Avenue, and for a portion of Adams Street. However, this condition could not be met for street drainage flows generated on 48th Avenue and on a portion of'Adams Street. i t Immediately south of the project, The Pyramids, a concurrent i project by others, has begun mass grading operations under a Mass Grading Permit issued by the City. As a part of this grading, �. 48th Avenue is being cut to slope at about 0.50% from Washington. ( Street to a low point approximately 600 feet west of Adams r j Street. This low point of 48th Avenue will be at elevation 50, I or about 6.5 feet below the normal water surface elevation of the lake. Further, the Evacuation Channel, which is approximately t ! 3000 feet east of Adams Street, has a design water surface elevation' of about 50. Therefore it is not.possible to take storm flows from the north half of 48th Avenue and from a portion r� 7 I i of the west half of Adams Street either to the lake or to the Evacuation Channel. The portion of the half width of 48th Avenue and, Adams Street tributary to the low spot is shown on the. Drainage Plan and has.been labeled sub - basins U -1 through U -5. The .tributary area will produce approximately 1.07 acre feet of i runoff at a peak instantaneous rate of 12.8 cfs during a 10 year ..storm, and about 1.92 acre feet at a peak instantaneous rate of 22.6 cfs during a 100 year storm. An agreement, a copy of which has been included for i reference, has been reached with the developers of The Pyramids i whereby any storm runoff from Basin U which cannot be disposed of by infiltration on the north side of 48th Avenue may be passed i under 48th Avenue and routed to a retention/infiltration pond. r: The pond is a site previously designated by The Pyramids for i collection and disposal of - runoff generated within that development. The additional.runoff, about 0.37 acre feet, will (; raise the water surface about 0.3 feet, and be infiltrated by an II I. additional drywell unit. 1 i 8 ) i CONCLUSIONS The storm drainage system for the Lake La Quinta.development will retain all runoff on -site, except runoff generated on 48th Avenue and on a portion of Adams Street. The runoff from the 10 i year storm will be collected to interceptor /drywell units located behind the curb. Flows which exceed the drywell capacity will be { temporarily stored in the lake, which may be expected to vary approximately 0.4 'feet in water surface elevation. The runoff from a 100 -year event will follow the same path as the 10 -year. ( flows, but will surface drain via graded swales from Avenida Del Lago to the lake. A system of pipes will return.stored runoff to the drywell units. The water surface will rise about 1.0 feet during a 100 -year storm. 9 t i r APPENDIX I PEAK RUN -OFF 10 YR FREQUENCY t C z I. t t l 0 N 1 R C F C Sk W C C, HYDROLOGY MANUAL RATIONAL METHOD CALCULATION FORM sheet Na _ of _Sheets PROJECT Lk Q"!'jTA Calculated by_ _ -- FREQUENCY Iy R- Checked by • - - -- • - -- - ��- DRAINAGE AREA • • '' ! • 1. R Ci F `i ik W C® HYDROLOGY MANUAL RATIONAL METHOD CALCULATION FORM PROJECT Q� NTA FREWENCT 1° Sheet Na.— of __Shoots - Calculated by Chocked by •' -"'� -' - '6gy-�-- DRAINA GE AREA __-�:_-_m MEMO v w R C FC W C ® HYDROLOGY MANUAL RATIONAL METHOD CALCULATION FORM PROJECT La. Lam. Q� .► �-A. - FREQUENCY Sheet No.. of _Sheets- Calculated by Checked by •---- •- - --�'— DRAINAGE AREA .. ,' N R C F C IN W C® HYDROLOGY JMANUAL RATIONAL METHOD CALCULATION FORM PROJECT FREQUENCY lc)4 —. .. Sheet Plate of — Sheets Calculated by __._ __1694 Checked by --- ---- -- — 15,n---^ DRAINAGE AREA ��IL R C F C IN W C O HYDROLOGY MANUAL RATIONAL METHOD CALCULATION FORM PROJECT La.��E. Lam.u►�ra FREQUENCY Ion= Shutt No._ of _Shoots _ Calculated by ------== -81[t'� - -- Chocked by • -- -- -- -- — �gy�-- DRAINAGE v I N R C FC fk WC D' HYDROLOGY JMANUAL RATIONAL METHOD CALCULATION FORM PROJECT �A.►-E L�.Qu.,-rr� _ FREQUENCY lC7 Y� Sheet Na._ of - _Shooit_ Calculated bp- _-- -�_ -�� - -- Checaed by --- - - - - -- -� - - -- DRAINA GE AREA,.- • r "' f • b ! 6 RCFC ai WCD HYDROLOGY MANUAL Sheet No. of .,._sheets - RATIONAL METHOD CALCULATION FORM PROJECT Calculated by FREQUENCY 10= Chocked DRAINAGE AREA -goo. MR MR r ' N R C FC & W C ® HYDROLOGY MANUAL RATIONAL METHOD CALCULATION FORM PROJECT FItEQUENCV 1D YR - Sheol Na_ of _Shoats Calculated by __.!x _- IxTit___ Chocked by • -- -- - �-- DRAINAGE I AREA m v N R G F C S W C® HYDROLOGY MANUAL RATIONAL METHOD CALCULATION FORM PROJECT Qu i "TA. FREQUENCY 1° � Sheet No.— of — Shoots - Calculated by Chocked by - ----- - -- -�-e- r q: _ sue■■ ®e����■■�■■ u. 0 N R C F C IS W C® HYDROLOGY MANUAL RATIONAL METHOD CALCULATION FORM PROJECT fIlEOUEgeY 1 °Y'z Sheet No._ of — Shoots Calculated 8K —•.. Checked by •-- - - - - -- —Bg-- DRAINAGE ARKA_ - p too v N R C FC & W C ® HYDROLOGY MANUAL RATIONAL METHOD CALCULATION FORM PROJECT LakE LAQu�►� rte FREQUENCY ►o rz Shoat No.— of ._Shasta Calculatad by .5jryl _ Chocked by - -- -- - - -• — BM - --- DRAINAGE AREA v N R C F.0 W C D HYDROLOGY h11ANUAL RATIONAL METHOD CALCULATION FORM sheet No.. of .._sheet- PROJECT L,ov—s LA Q�,,jTA - Calculates by ISK Y19 FREQUENCY =Y= Checked by "'• "-- '''std__ DRAINAGE AREA_ OWNS mmm _ ®� �mamm� ®mmmm�� a-Mm mmmmmm� ®mmmmm� mmm 0 N Sheet No.— of _Sheen Iculoted by 8c:__ acked by --- - - - - -- -�- DRAINAGE AREA .. p N R C FC fk W C ®, HYDROLOGY MANUAL RATIONAL METHOD CALCULATION FORM sheet Na_ of _sheet: PROJECT L-AY-e u'^'Tt— , Calculated b a-� FREQUENCY lo`r� Checked by •••-••--• —�•— DRAINAGE AREA logo 0 �., mmffl� 0. I M10 MA v N R C F C W C D HYDROLOGY MANUAL RATIONAL METHOD CALCULATION FORM PROJECT La4E FREQUENCY Sheet No.._.. of _.Shoots Calculated by __. -E)? Chocked by•-------- -�- -- DRAINAGE AREA 0 am. ,. 8 N I R C F C a W C O HYDROLOGY NJANUAL RATIONAL METHOD CALCULATION FORM PROJECT Qu I "TA- FREQUENCY Shoot Na_ of Sheets. Calculated by Checked by • -- -- - - -• - �• -- DRAINAGE moommom u{ 7 N R C FC a W C o HYDROLOGY NIANUAL RATIONAL METHOD CALCULATION FORM i PROJECT A. fNEQUENCV la Ye- Sheet No.— of — Sheoto- Colculated by Chocked by jar*--- AREA i C APPENDIX II PEAK RUN -OFF 100 YR FREQUENCY I rl v N R C FC & W C D HYDROLOGY MANUAL RATIONAL METHOD CALCULATION FORM PROJECT LAY-E L... �utiTA FNEQUENCY loo �P Sheet No.. of — sheet& Colculoted by Checked by DRAINAGE- AREA �... I v w R C FC 1k W C D HYDROLOGY MANUAL RATIONAL METHOD CALCULATION FORM PROJECT L.A.QuitiTA, FREQUENCY 1QQ YP. Sheet Na_ of — Sheets - Calculated by __._a _- '31tyl___ Checked by •-- - - - - -- - BIM - -- DRAINAGE ARE-A. Mal 'immom m -,,,MEMO 0 . 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Calculated by 1SET11 Checked by •-- -•-- -- — �j- - -_ DRAINAGE AREA _ 0 N R C FC 01 W C D HYDROLOGY MANUAL RATIONAL METHOD CALCULATION FORM PROJECT LAS La C�� tiTA FREQUENCY Sheet No.— of — Sheela Calculated Checked by - ---- - - -- —�- -- DRAINAGE OEM Ii- hm,m.mm� REMARKS 0, R C FC a W C® HYDROLOGY MANUAL RATIONAL METHOD CALCULATION FORM PROJECT �-a� LtaQ„�►�Tta FREQUiNcy _ loo 1 p— Shoot No.— of ...Sheets Calculated SEA9 " Checked by ••�•••��• ��•-- RAINAG AREA - MERM mmmm mmmmmm mmmm®mmmmmm mmmmmmmmmmm mmmmmm mmm�mmm.mm m A v N R C F C IN W C® HYDROLOGY NIANUAL RATIONAL METHOD CALCULATION FORM PROJECT L.AK..E L� Qu« T4, FREQUENCY ICO YR-- Shoot No.— of — Shoots Calculated by Chocked by by --- ---- -- —�- -- RAINAGE - . _ 'Ma. � I'mmin ME mmmmm mmmmm mm mm �■mm.m mmmmmm mm mm ul N R C+ F Ci & W C ® HYDROLOGY MANUAL RATIONAL METHOD CALCULATION FORM PROJECT Lam Lam. 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(sZ%A1.1'Txh - Calculated by FREQUENCY loo`( Chocked by•------- - -�- -� DRAINAGE AREA 177=1m • • •J REMARKS r r APPENDIX III LAKE STORAGE COMPUTATIONS INLET & PIPE SIZING AM Mainiero, Smith /Spiska Engineering owl A J O 1 N T V E N T U R E I CIVIL. -NDDEVELOPMENT. AND ENVIRONMENTAL ENGINEERING • SURVEYING Bank of Palm Springs Centre 777 East Tahquitz Way Suite 301 Palm Springs, CA 92262 - Telephone (619) 320 -9811 / FAX (619) 323 -7893 SUBDIVISION LL V­5 LA QuIhJZA_ PROJECT SUBJECT T��-rAt_ iZu►.1oF�• . 1� = �2 Ro��Fa►� -t_- RUF.IbFF A x C i, (4-;rJ'' /12� -72 . s CD 4.30 ,! .. _...._�......_- _..._.. _..°>_•6>2. _..._..,.. ._•-- .....,_...- .,:....,.....,. S.D. .......:_... • � : :.,... ....._.. � .__.._.. Sb .. O • X04.5.. . ( L 5.41 .�.. 0.5� 110.. . �o�.: ": 2.42..5'._,. 2 • 0 B9:. ` l_ I 0.`5'.9 .... ......... . CIL 7.84 .. :..... .90 , t o • 1�4•?�.: � .._';.:' .:. :::::= N:y -:';. ^�.rr9b . ... 3.21 �F� ' ` W tTN ►.Ip . 1 N F1LjF A.'� 10►.1.) �b I...A: �G Pa•RCi. =- .. . 55 o = ; .... :...... Q ' t 44•. 21 � a � X��-� S� = 18,25 cry::: - C� 24 ) : �-t5." -twt,. Z = -1 °� � °�.. =.: cog - -:�_.. ,- �C 3.20 IT 1 13 Mainiero, Smith /Spiska Engineering I A J O I N T V E N T U R E Li IV CIVIL LANDDEVELOPMENT, ANDENVIRONMENTAI ENGINEERING •SURVEYING Bank of Palm Springs Centre 777 Fast TahclWtz Way Suite 301 Telephone(619)320-9811 /FAX(619)323-7893 i SUBDIVISION LAS QLl1 W- TA- PROJECT Mainiero, Smith /Spiska Engineering A J O 1 N T V E N T U R E ' DiiD=B I VIL, LANODEVELOPMENT, AND ENVIRONMENTAL ENGINEERING • SURVEYING ank of Palm Springs Centre 777 East Tahquitz Way Suite 301 Palm Springs, Telephone (619) 320 -9811 / FAX (619) 323 -7893 SUBDIVISION Ls-Y-e Ld Q,3 e g-z& PROJECT I' SUBJECT l�B�MI tJa-rlbtJ OF STbt31�GE 1oD Y� 1✓VEe.IT S- PP_AGE_ = Wix.- FtL. W OFF ._: P_QWcFF.:. :.lt�1F1t_'tRA.: - I1.►Ftt_"rP�. ..:.. _..- . TINE % of " '5: % DF_.. '/0 60... Mt % or-. I►.1ce kAF_vAT,' tc > -%(PL' .. tcc - e._..::` too `(� too.�(ta 4. t.o.. , 4.3 -T I , o. 5.3 . . 520 .o. __.. ........ . . tq._ __. _. _ . ..._......... _, 9. CIS 4.05.,' _. _... f 12..x_.:._' - :.: MIS 14.10. -.. 11. 1 .. I`.�.._:.: 14.10 _..:.. 36.0 : ::.. ,_ M; So 22' ' 4.0. _. -.. :_. 42,e 24 3 S. . • :,. _._..._ 22 .'b0. _ 32 ,1 c' -. .. tea . :. S•1.. : :.: `b. 1. :_..._. .... :.... .:.. 23.25 ". 3�. SS: ". :: -_ :. - :.. � ..... 6 2'I `.a :: �L.`i !.... - _ _., .. . _ 24.2fl ; .. 42,."10. : ...... _...'... - 28 :: 4:c ... _. �ia5 : :.: 25. 15 ... 46.. 5. ___.__ _...- ._.�.._..s.,.i__ -• 81.9 s._._....9.._� .vh 2'j.o5 °__: . 54:�s.... 31 4.7� 95�: :: :: :"''a`.:• 28.95 °�: ��. : `! • 45. ::.*_ - LAS:• : :...: . ot5.. :. 2q.90 16.: :. ....A...,._...a...- I 316 .9 _ 93..'t ...: "_"a..:.._...95 : :: :.:: 32. "fS :....: X0.95.._ .`.. - ..:. . .:..... . 3"7 .8 : :...... R4•.5::_ : ::. . 9S:.. " ^' :.:. 33.-70 I , - - ._.Clvl.•. 45 _ %.e,_.,C3Z...2l�Ac. FT�;.:..._.... 22.9.0.8T, .- ,.- FT�__�.- :- �_:.:_,_,.�_. .._,_.. �: :._.� :- - _ _ AG Foy. /2_A-.t o A:. POIJQ: L all� AM Mainiero, Smith /Spiska Engineerin AF H A J O 1 N T V E N T U R ( — IV IL, -AND DEVELOPMENT, ANDENVIRONMENTAL ENGINEERING •SURVEYI l Bank of Palm Springs Centre 777 East Tahquit Telephone (619) 320 -9811 / FAX (619) 323 -785 SUBDIVISION �-a� -E L- &Qu,oT A PROJECT ({ SUBJECT -(,z 5 x /12)..... E�SIIJ....-. : -» d�FJs; ..: :.:.. . _._ C..:�.• : :..., RuNOFF•..: ::. : ":-- :.:. -. :__ -.: � - .._..- .__._._; - -' - -•- - - _. :.: Z" .1:14 30 __.....,:..�.:_.___. : :. :_ :;_._ 9._ ��__. .:....._:..�.:_..__....., - "_._. �'� _ .So'v,.:.� :: • . :..1... "0.02.- ;".:�.,- .. :.._.�„ti. :," -w� :--- ...._ :�:.:;.�..� r-.. . _ . S oa : : ". , .. � • '358 _:� :. -..... .. �... .. 5, 4-L: "�• - .500_ :. :. • f , - i -- •...N : ::.- • - -. �'° •�?•sa�. ....... Y �•_�:.,,`,-.... ., 500_._ '_• .c�•2�9.. :_ . :�._ : : :��: _ ; -_ . :_: - L12 r. R� ... ._......_l i.l ' ,E.. c 1 Ac�. _..... 20. 1 .1, l� �. -.: __.. C.�.�i�o-?. -10C, �= _ ._V ': (9 ,99-c � - a e- ... (24. 19., BL.:': - �� -=_ , . :'7 << _ •� O.84=; IWC-P_EASE..IWOEPTVA IF,- ._.T14M(t•>✓: :..._':...'; t 2.4.0_. 4c Polr.tD =.. . _..... ...._ .aS:.._.►a0 . INFIt_- ['R.�4TIO�t °: :. :`: - :.::...., _;.. - _.... ::_ :.:. :.::.: • • __: J i f 11 tE Mainiero, Smith /Spiska Engineering A J 0 6 N T V E N T U R E CIVIL LAND DEVELOPMENT. AND ENVIRONMENTAL ENGINEERING • SURVEYING Bank of Palm Springs Centre 777 East Tahquitz 1 Telephone (619) 320 -9811 / FAX (619) 323 -7893 SUBDIVISION K-6 i WA PROJECT SUBJECT RutiaFF ys �►J�1LTP�aTlO1J 1- �YOP�C� 1�. �O YP_ �la6n: IA _ . ..... .... , �. U ..a _.. _.. ... _ , ...... _ .. _. _........... - , I Jn 5) w J 4 Z Q f^ ttL' 1 IL 0 Q N 4 Mainiero, Smith /Spiska Engineering A J O 1 N T V E N T U R E CIVIL. LAND DEVELOPMENT. AND ENVIRONMENTAL ENGINEERING • SURVEYING Bank of Palm Springs Centre 777 East Tahquitz Way Suite 301 Palm Springs, CA 92262 -7066 Telephone (619) 320 -9811 / FAX (619) 323 -7893 SUBDIVISION LAS �-= �L PROJECT SUBJECT n���- 1`�I��T1otJ �FpR�.C^�� to - `�t? �yE►JT lNF- IL�'P.:�,Tloµ�- _ .... ._. �:. _..... ' RJ.►NOFF : RLiI.10F �.:r- I►- 1FIgt&. :. IwrIL- TP.L+•,: 7 1VAIG °% o1r �l .% OF; -; a�o oM' :'' ..' 16 IIJC2EMENT.. -. ►g- R'� :_ .. 10 : =..'. 1b -Y�, :. .... ID- 12 � - 1:�.: � 12...► :.._.: 1•r,.:::.:. :.: 12,1.::...,...._ c . - - -- - - 14 VI 20.5 I I-1:: 3. D 23.5 :;- : ::::;: 1 .-► .. 2o:(d :. :.� 2.90 .... ' .:. 18. I 3,3 2L.8 :::..: _. .1 .'► 22:3_ ..: 4•50 .. h 3,9 . 30.E : :: ::. 24,0 21 3.0 .. 22... 12,90... 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(•— � « .__._..__..._ —. � .__ .— • ____ 1. . 1 i , � _.._.— �__ i_ _.._... _ __L- ._�— _._ - -�_' _ l W 0 kv f- 4 i- W u Z 1 c i Mainiero, Smith /Spiska A J O 1 N T V E Bank of Palm Springs Centre 777 East Tahquitz Way Suite 301 Palm Springs, CA 92262- Telephone (619) 320 -9811 / FAX (619) 323 -7893 SUBDIVISION PROJECT SUBJECT DET�F2M1t�lA'jlbN of StORAG� . �PSIt�1 i�/l-I I��L1TI0l�l� 1►•iFILj- P�.'�'lOt.�... �F,�LD .. ... __ ......... .. •_,. _ ... . TIME' R�NOFF� °,6 (2ut.ioFF - I►iFtL�AT101.1 IWF=IL:. 0IFF's IWc_P_EM5wT.. aF IOOYR -.. �c+ ., ._ . �° of IO�Yi'— �. :. : :.. 10.5 . IZ I, c� t2. t....:_ �_ _.._ ... l •` 12.1. .: ....." ... .. - t3 l•a- :. - t�.9 :.�.." :.._:._ I ;s � 13.9:: -.. _ ... -- - - 14. 2.0 ... 22.:. � .: 4•D: ::�:_: .. 42.ti "��:e ::.�:.: �.. : ". 35.5 �-: - ... �.5 .. � 23 . :.. 3s..:. - .. 45:aY__�__... �." • � - X3.0 •. 1,a • ' . _. 2. to .. 5.7._... .... 25 ." 4.to - . :. -Tt•5.::.y ::..: :_ :.. ... 5D.5.::: :._. 21.0 - : ::.::.. :.:. 29.: 513 : - ::... lio.8 " :: _ ::.:. ": 5�.0 ._ . ...._.. ( ... 5.1: :._.........: • E1:9 ..__w g2 3•�►. ":. 90.4'_:: :...::: �.5:.. 2919: _ 33. .13..... :; 91.2_ :::.: e 0.. _...,..:'. 21.5.. - .._.__ .. :._ :.... R�i D: :� T� T :..... 1 _......r_�_T_ Mainiero, Smith /Spiska Engineering A J O 1 N T V E N T U R E CIVIL, LAND DEVELOPMENT, AND ENVIRONMENTAL ENGINEERING • SURVEYING qlvidD Bank of Palm Springs Centre 777 East Tahquitz Way Suite 301 Palm Springs, Telephone (619) 320 -9811 / FAX (619) 323 -7893 SUBDIVISION -PROJECT SUBJECT 1 till_,_ :. 10�t_' q, W . Peglo w _ p 9 , torn . 3.�f, 4.0 _ .... F: $.3t. 3.2 ¢.o _.. 4.0 � 2 •- -1:0 ' :: - C.S�N.jIN0005 .GRaDI� �'Qloe, Y� 2:::.: 13.3-1 i S.g - -1.0 2 3 4.55.x`" . ;.... I - `� 4.0 .... _ .. _ ... _ _..... ..: 4. _. cr 39. 4. 4 3 a f /2— Fig. B -4 i l i I INLET CONTROL NOMOGRAPH FOR SQUARE-EDGED ENTRANCE IN A HEADWALL 300 200 100 a, 80 0 60 50 y 40 30 o• 10 8 6 5 4 3 (6) square -edged entrance Appendix B 5.5 5.0 4.5 4.0 2D, 1.5 HW D 1.0 09 0.8 0.7 .M '935 168 156 144 132 120 108 96 84 72 r 60 c ` .01 48 I � E 0 v C O 36 l 24 C f /2— Fig. B -4 i l i I INLET CONTROL NOMOGRAPH FOR SQUARE-EDGED ENTRANCE IN A HEADWALL 300 200 100 a, 80 0 60 50 y 40 30 o• 10 8 6 5 4 3 (6) square -edged entrance Appendix B 5.5 5.0 4.5 4.0 2D, 1.5 HW D 1.0 09 0.8 0.7 .M '935 r Am Mainiero, Smith /Spiska Engineering "wiD D A J O 1 N T V E N T U R E CIVIL LAND DEVELOPMENT, AND ENVIRONMENTAL ENGINEERING • SURVEYING Bank of Palm Springs Centre 777 East Tahquitz V Telephone (619) 320 -9811 / FAX (619) 323 -7893 SUBDIVISION �► Q u ►� TA PROJECT Suite 301 Palm Mainiero, Smith /Spiska Engineering A J O I N T V E N T U R E I CIVIL. LAND DEVELOPMENT. AND ENVIRONMENTAL ENGINEERING • SURVEYING Bank of Palm Springs Centre 777 East Tahquitz Way Suite 301 Palm Springs, CA Telephone (619) 320 -9811 / FAX (619) 323 -7893 SUBDIVISION PROJECT I, Alffltbl U_1% Mainiero, Smith /Spiska Engineering A J O 1 N T V E N T U R E CIVIL. LAND DEVELOPMENT. AND ENVIRONMENTAL ENGINEERING • SURVEYING Bank of Palm Springs Centre 777 Fast Tahquitz Way Telephone (619) 320 -9811 / FAX (619) 323 -7893 SUBDIVISION PROJECT_ SUBJECT 4 ico 4.55..... _ Foy h = . 51 ci - _ Q 301 Palm Springs, CA 92262= ...19)52C> Gu Ej':`: Cl:�O 11J.F.ILTJ 140.:__. ;.._:_.... ::: -_..✓ j ...:: :..: ". "_ :._'..� Mainiero, Smith /Spiska Engineerin A J O I N T V E N T U R' CIVIL LAND DEVELOPMENT. AND ENVIRONMENTAL ENGINEERING • SURVEY! qDqv Bank of Palm Springs Centre 777 East Tahquit2 Telephone (619) 320 -9811 / FAX (619) 323 -785 1 t I, 1. SUBDIVISION PROJECT 301 : f i i r • a Mainiero, Smith /Spiska Engineering A J O 1 N T V E N T U R E CIVIL. LAND DEVELOPMENT. 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