Orestimba Creek Hydrology - Stanislaus County

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TABLE 7Salado Creek at DamsiteFlow DurationPeak and daily flow are 34 percent of Del Puerto Creek near PattersonPeak 1-DAY 3-DAY 5-DAY 7-DAY 10-DAY 15-DAY 20-DAY 30-DAYWY Flow Day-cfs Day-cfs Day-cfs Day-cfs Day-cfs Day-cfs Day-cfs Day-cfs1959 612.01960 55.81961 8.81962 232.91963 166.61964 14.31965 35.41966 8.2 6.8 6.1 5.4 4.5 3.6 2.8 2.3 1.71967 401.2 84.0 55.6 43.5 34.0 32.9 24.6 19.2 13.41968 25.5 10.2 4.7 3.3 2.7 2.1 1.6 1.4 1.21969 310.4 135.7 91.0 71.6 64.5 52.9 44.2 40.5 33.71970 61.9 28.9 20.6 18.4 15.7 12.9 10.9 9.0 6.91971 42.5 21.4 13.1 10.0 8.1 6.7 5.3 4.4 4.51972 1.7 1.4 1.2 1.1 1.0 0.9 0.8 0.7 0.61973 166.9 90.8 66.5 55.2 54.2 49.9 38.5 31.2 27.21974 33.7 24.5 18.5 14.8 12.8 10.9 9.0 8.2 6.91975 71.1 40.5 28.7 21.7 17.5 15.4 12.7 12.2 9.61976 1.2 1.1 0.9 0.7 0.7 0.6 0.5 0.4 0.31977 1.7 1.7 0.6 0.4 0.3 0.2 0.1 0.1 0.11978 255.0 86.4 68.0 49.4 40.2 32.0 24.3 20.0 20.81979 53.7 30.3 26.4 20.0 15.8 12.2 9.0 7.5 5.61980 506.6 260.8 208.6 176.9 143.7 109.8 79.3 65.7 48.61981 27.2 12.9 7.8 5.7 4.5 3.5 2.7 2.3 1.91982 438.6 168.0 94.4 60.4 44.7 34.5 34.5 29.2 22.31983 547.4 330.8 258.5 205.4 167.4 135.3 111.6 96.5 80.71984 154.4 107.8 54.3 37.3 29.3 22.7 16.7 14.0 11.51985 25.2 13.3 8.2 6.0 4.7 3.7 2.7 2.3 2.01986 516.8 263.5 214.4 169.9 143.9 108.2 75.4 57.6 46.21987 39.8 18.0 9.3 6.3 4.8 3.6 2.6 2.1 2.21988 27.2 13.3 10.2 6.9 5.3 3.9 2.8 2.3 1.71989 0.6 0.4 0.4 0.4 0.4 0.4 0.3 0.3 0.31990 126.1 33.3 16.7 10.3 7.5 5.3 3.5 2.7 1.81991 241.4 78.2 43.5 31.0 24.6 18.6 13.8 11.1 8.31992 208.8 89.1 37.6 37.3 30.4 23.1 16.7 12.7 9.31993 310.4 200.6 113.4 87.6 74.8 56.6 40.6 35.3 28.71994 13.3 9.9 6.7 5.2 4.3 3.4 2.6 2.5 2.01995 1156.0 418.2 221.0 147.5 112.0 83.5 79.0 66.1 48.71996 211.8 111.5 90.9 72.4 58.3 46.3 36.9 33.1 29.51997 632.4 249.9 143.9 132.9 110.8 85.9 63.3 50.7 45.11998 1791.8 635.8 293.0 241.8 222.0 179.3 143.9 131.4 111.91999 77.2 26.9 19.8 15.2 11.9 9.3 7.4 6.3 4.92000 248.9 97.9 54.6 37.9 28.4 23.0 22.2 19.1 14.72001 110.2 59.5 29.9 20.9 16.1 12.0 9.9 8.0 6.02002 26.9 17.3 10.2 7.9 8.5 7.0 5.3 4.4 3.42003 251.3 74.8 48.1 34.6 29.9 23.0 18.3 16.1 11.62004 100.3 48.6 30.1 20.9 16.1 12.0 8.6 6.7 4.92005 130.6 69.7 52.8 42.4 42.0 34.5 27.1 23.3 17.82006 152.7 58.8 39.3 2001.0 23.5 19.0 15.4 1970.0 10.220
4. FLOOD HYDROGRAPHSThe original flood hydrographs for routing through the dry dam and project area were developedfrom the HEC-HMS model output using a 1 percent 96-hour storm centered above Orestimba Creeknear Newman gage, site of the proposed dam on Orestimba Creek. A concurrent storm wasdeveloped for local areas below the Damsite to derive local flows that would flow into OrestimbaCreek below the Damsite. Figure 4 shows the procedure that translates the average daily flows fromthe frequency curves to the synthetic rain flood hydrographs. The peaks and average volumes ofthese hydrographs were modified to reflect the new peak and volume flow frequency curves. The 96-hour storm produced the 5 days of runoff pattern from the original report. This 5-day hydrographbecame the main wave runoff pattern used to develop a 6-wave 30-day flood (examples showing theuse of the 30-day flood series can be found in References g and h). Its volume was adjusted to matchthe peak, 3- and 4-day volume from its frequency curves. This pattern was then used to compute six5-day waves to produce a 30-day 1 percent probability flood series. The 0.2, 0.5, 2, 10 and 20percent probability floods are ratios of the 1 percent flood series based on ratios of flows from thepeak and volume frequency curves. These floods will be used for sizing the reservoir and definingthe Orestimba Creek floodplain. The flood series for the local areas used the concurrent 5-day waveand determined the other waves using the ratios of the volumes from the Orestimba and Del PuertoCreek frequency curves. See Reference b for the development of the unit hydrographs and routing inthe HMS model.21
Page 1: Orestimba Creek HydrologyA Reevalua
Page 4 and 5: 8. Del Puerto Creek Flood Volume Ma
Page 6 and 7: Figure 1. General Map4
Page 8 and 9: Photo 2. Orestimba Creek, looking s
Page 10 and 11: The current analysis included an ad
Page 12 and 13: TABLE 2ADel Puerto Creek near Patte
Page 14 and 15: Orestimba Creek near NewmanAccurate
Page 16 and 17: Table 4FFA Results for Orestimba Cr
Page 18 and 19: TABLE 5AOrestimba Creek near Newman
Page 20 and 21: TABLE 5BOrestimba Creek near Newman
Page 24 and 25: Figure 4. Translation of average na
Page 26 and 27: Figure 5. Subarea Map. Report hydro
Page 28 and 29: Orestimba Creek Flood Volume Durati
Page 30 and 31: Table 9 shows the ratios of Orestim
Page 32 and 33: Orestimba Creek Near Newman, CA(at
Page 34 and 35: Orestimba Creek Subarea 4ORSUB4Main
Page 36 and 37: 6. REFERENCESa. U.S. Army Corps of
Page 38 and 39: 36Chart 1
Page 40 and 41: 38Chart 3
Page 42 and 43: 40 Chart 5
Page 44 and 45: Table A1Orestimba Creek Flood Hydro
Page 58 and 59: PeriodDay-hrTable A3Crow Creek Loca
Page 70 and 71: Table A5Orestimba Creek Local Flowf
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Table A5Orestimba Creek Local Flowf
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PeriodDay-hrTable A7Orestimba Creek
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Orestimba Creek Hydrology - Stanislaus County

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