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0309-049 (SFD) Hydrology CalcsHYDROLOGY CALCULATIONS �o FOR THE ESTANCIAS - TRACT 26524, LOT 8 79 33 �* iei��D r PREPARED BY: PETER G. RINGEIS DATED: AUGUST, 2003 v Ppo�cssl� CITY OF LA QUINTA N0.1-3515 BUILDING & SAFETY DEPT. EXP. 3-3:i-0 APPROVED CIVIL FOR CONSTRUCTION Qt, �►�� �,z CALlf DATE - --7— BY �6 TRISTATE drllO % ZOD 3 LAND SURVEYORS & CIVIL ENGINEERS 78-120 CALLE ESTADO, SUITE 102, LA QUINTA, CALIFORNIA (760) 564-0271 TRI-STATE • Land Surveyors & Civil Engineers 78-120 Calle Estado Suite 102 La Quinta, California 92253 (760) 564.0271 FAX (760) 564-0279 JOB Lar _ TTzhcr NG, 21,524 SHEET NO. OF CALCULATED BY �1 K I K1670 S DATE CHECKED BY SCALE Noa . DATE TO. P. AYC-...h.R Frs...:... :. .. ; ... FRvur............. .............. :...................... :....................... ..... .. I ►.. z .� .. . l.1.....: ............................ :............ 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PP"I204.1 IS Je SAee61205-1 IPaWW) -TI �&CiMLWOJ —522 j FTI i I Q- �-T U771 ih .c21_Zc 1-1 -T- -1 1 -LLD5;�Ll 0 C, :z 1 I 0,12-6 A-1- I i ;z r4 P :Z1 ks I Ll IF I j I 1 i I J I T7-1 FF 1 5H -r 3 A B_ c D 1 RCFCD SYNTHETIC UNIT HYDROGRAPH 2 DATA INPUT SHEET 3 4 WORKSHEET PREPARED BY: P' RINGEIS'-'. i4_1 —5 6 PROJECT NAME TRACTlNO.26524 7 JOB NO. 03-1551 8 9 CONCENTRATION POINT DESIGNATION 10 AREA DESIGNATION LOT 8"FRONTtYARD.-., 11 12 TRIBUTARY AREAS' ACRES 13 14 COMMERCIAL 15 PAVING/HARDSCAPE 0.06 16 SF - 1 ACRE - 17 SF - 1/2 ACRE 0.28 18 SF - 1/4 ACRE 19 MF CONDOMINIUMS 20 MF - APARTMENTS 21 MOBILE HOME PARK 22 LANDSCAPING 23 RETENTION BASIN 24 GOLF COURSE ai 25 MOUNTAINOUS 26 LOW LOSS RATE (PERCENT) 27 28 LENGTH OF WATERCOURSE (L) 70 29 LENGTH TO POINT OPPOSITE CENTROID (Lca) 30 31 ELEVATION OF HEADWATER 32 ELEVATION OF CONCENTRATION POINT 47:75 33 34 AVERAGE MANN] NGS'N'VALUE , ,0.2 35 36 STORM FREQUENCY (YEAR) 37 38 POINT RAIN 39 :2 40 6 -HOUR 'X2:5 41 24-HOUR 42 43 BASIN CHARACTERISTICS: ELEVATION AREA 44 45 46 47 48 7, 49 50 51 52 PERCOLATION RATE (in/hr) = .1 .53 54 DRYWELL DATA 55 NUMBER USED 56 PERCOLATION RATE (cfs) 0 Swr 4 RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: BASIC DATA CALCULATION FORM JOB NO. SHORTCUT METHOD BY TRACTNO.26524 03-1551 P. RINGEIS DATE 8/5/03 3 -HOUR 6 -HOUR PHYSICAL DATA EFFECTIVE RAIN (in) 0.88 0.81 III CONCENTRATION POINT FLOOD VOLUME (cu -ft) (acre -ft) 1,087 0.02 1 960 0.02 2 AREA DESIGNATION 1,078 0.02 987 0.02 LOT 8 FRONT YARD PEAK FLOW (cfs) 3 AREA - ACRES 0.43 0.09 0.340 4 L -FEET 70 5 L -MILES 0.013 6 La -FEET 35.00 7 La -MILES 0.007 (81 ELEVATION OF HEADWATER 48.5 9 ELEVATION OF CONCENTRATION POINT 47.75 10 H -FEET 0.75 (1 11 S-FEET/MILE 56.6 12 S^0.5 7.52 13 L'LCA/S^0.5 0.000 1141 AVERAGE MANNINGS'N' 0.2 15 LAG TIME -HOURS 0.06 (161 LAG TIME -MINUTES 3.8 [171100% OF LAG -MINUTES 3.8 [181200% OF LAG -MINUTES 7.7 [191 UNIT TIME -MINUTES 100%-200% OF LAG 5 [241 TOTAL PERCOLATION RATE (cfs) L 0.00 RAINFALL DATA (11 SOURCE (2) FREQUENCY -YEARS 100 (3) DURATION: 3 -HOURS 6 -HOURS 24 -HOURS (4) [5) (6) (77) POINT AREA AVERAGE RAIN POINT INCHES RAIN Plate E-5.2 INCHES (8) POINT RAIN INCHES Plate E-5.4 191 [101 AREA [11] AVERAGE POINT RAIN INCHES (12) (131 POINT AREA RAIN INCHES Plate E-5.6 [14) 115) AVERAGE POINT RAIN INCHES 2.00 0.340 1.00 2.00 2.50 0.340 1.00 2.50 ----4.501 0.340 1.00 4.50 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 SUM (5) 1 0.34 SUM (7) 2.00 (16) AREA ADJ FACTOR 1.000 (17) ADJ AVG POINT RAIN 2.00 SUM [9] 1 0.34 SUM [11] 2.50 SUM [13] 0.34 SUM [15] 4.50 1.000 4.50 1.000 2.50 STORM EVENT SUMMARY DURATION 3 -HOUR 6 -HOUR 24-HOUR EFFECTIVE RAIN (in) 0.88 0.81 0.78 FLOOD VOLUME (cu -ft) (acre -ft) 1,087 0.02 996 0.02 960 0.02 REQUIRED STORAGE (cu -ft) (acre -ft) 1,078 0.02 987 0.02 952 0.02 PEAK FLOW (cfs) 0.53 0.43 0.09 MAXIMUM WSEL (ft) Plate E-2.1 Page 1 of 1 S ti T- 5 A B C D 1 RCFCD SYNTHETIC UNIT HYDROGRAPH 2 DATA INPUT SHEET 3 4 WORKSHEET PREPARED BY: P. RINGEIS 5 6 PROJECT NAME TRACT N0:26524 7 JOB NO. 03-1551', ' 8 9 CONCENTRATION POINT DESIGNATION 10 AREA DESIGNATION LOT 8 REAR YARD 11 12 TRIBUTARY AREAS ' ACRES 13 14 COMMERCIAL 15 PAVING/HARDSCAPE 16 SF - 1 ACRE 17 SF - 1/2 ACRE 0.28 18 SF - 1/4 ACRE 19 MF - CONDOMINIUMS 20 MF -APARTMENTS 21 MOBILE HOME PARK 22 LANDSCAPING 23 RETENTION BASIN 24 GOLF COURSE 25 MOUNTAINOUS 26 LOW LOSS RATE (PERCENT) 900/0 27 28 LENGTH OF WATERCOURSE (L) 140 29 LENGTH TO POINT OPPOSITE CENTROID (Lca) 70 30 31 ELEVATION OF HEADWATER 48.5 32 ELEVATION OF CONCENTRATION POINT 47 33 34 AVERAGE MANNINGS 'N' VALUE 0.2 35 36 STORM FREQUENCY (YEAR) 100 37 38 POINT RAIN 39 2 40 6 -HOUR '2.5 41 24-HOUR 4.5 42 43 BASIN CHARACTERISTICS: ELEVATION AREA 44 45 46 47 48 49 50 51 52 PERCOLATION RATE (in/hr) 1 53 54 DRYWELL DATA 55 NUMBER USED 56 PERCOLATION RATE cfs 0 5++r c- RCFCD SYNTHETIC UNIT HYDROGRAPH METHOD PROJECT: BASIC DATA CALCULATION FORM JOB NO. SHORTCUT METHOD BY TRACTNO.26524 03-1551 P. RINGEIS DATE 8/5/03 3 -HOUR 6 -HOUR PHYSICAL DATA EFFECTIVE RAIN (in) 0.76 0.69 [11 CONCENTRATION POINT FLOOD VOLUME (cu -ft) (acre -ft) 775 0.02 1 573 0.01 [21 AREA DESIGNATION -;769 0.02 691 0.02 LOT 8 REAR YARD PEAK FLOW (cfs) (31 AREA - ACRES 0.34 0.06 0.280 4 L -FEET 140 5 L -MILES 0.027 6 La -FEET 70.00 La -MILES 0.013 f8l ELEVATION OF HEADWATER 48.5 9 ELEVATION OF CONCENTRATION POINT 47 10 H -FEET 1.5 17 S-FEET/MILE 56.6 [121 S^0.5 7.52 13 L'LCA/S^0.5 0.000 [141 AVERAGE MANNINGS'N' 0.2 [151 LAG TIME -HOURS 0.11 [161 LAG TIME -MINUTES 6.5 [171100% OF LAG -MINUTES 6.5 [181200% OF LAG -MINUTES 13.0 [191 UNIT TIME -MINUTES 100%-200% OF LAG 5 [24] TOTAL PERCOLATION RATE (cfs) 0.00 RAINFALL DATA [1) SOURCE (2) FREQUENCY -YEARS 100 (3] DURATION: 3 -HOURS 6 -HOURS 24 -HOURS [4] (5) [6] (7) POINT AREA AVERAGE RAIN POINT INCHES RAIN Plate E-5.2 INCHES (8) POINT RAIN INCHES Plate E-5.4 [9] (10) AREA [11] AVERAGE POINT RAIN INCHES (12] [13] POINT AREA RAIN INCHES Plate E-5.6 [14) (15] AVERAGE POINT RAIN INCHES 2.00 0.280 1.00 2.00 2.50 0.280 1.00 2.50 4.50 0.280 1.00 4.50 0.00 0.00 1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1 0.00 0.00 0.00 0.00 0.00 0.00 1 0.00 0.00 SUM (5) 0.28 SUM (7) 2.00 (16) AREA ADJ FACTOR 1.000 (17) ADJ AVG POINT RAIN 2.001 SUM [9) 0.28 SUM [11] 2.50 1.000 2.50 SUM (13) 1 0.28 SUM (15) 4.50 1.000 4.50 STORM EVENT SUMMARY DURATION 3 -HOUR 6 -HOUR 24-HOUR EFFECTIVE RAIN (in) 0.76 0.69 0.56 FLOOD VOLUME (cu -ft) (acre -ft) 775 0.02 697 0.02 573 0.01 REQUIRED STORAGE (cu -ft) (acre -ft) -;769 0.02 691 0.02 568 0.01 PEAK FLOW (cfs) 0.42 0.34 0.06 MAXIMUM WSEL (ft) Plate E-2.1 Page 1 of 1