Orestimba Creek Hydrology - Stanislaus County

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Table 9 shows the ratios of Orestimba Creek’s(ORES1) and Crow Creek’s (CROW1 andCRSUB2) 5-day main wave used to produce the 1percent 30-day series. Orestimba Creek’s 5-dayvolume was a little less than the frequency curve’s5-day volume, so the second 5-day wave ratio wasincreased to make the 10-day volume match thefrequency 10-day event. The same was done on theremainder of the main wave ratios so that theresulting volumes matched the Orestimbafrequency curve. Orestimba Creek’s ratios to themain wave are listed in Table 10. Crow Creek’smain wave is the product of a concurrent 1 percentstorm over its basin. The main wave is less than aspecific centering over the same area. Ratios inTable 9 are derived from Del Puerto Creek’svolume flow frequency curves without any furtheradjustment.StartDayTable 91 Percent 30-Day Flood Seriesfor Orestimba and Crow CreeksRatios of Main WavesUsed to Develop 30-Day SeriesRelative WaveSizeORES1LocationCROW1 &CRSUB21 6 0.166 0.1736 4 0.188 0.19111 2 0.438 0.29816 1 1.000 1.00021 3 0.184 0.23626 5 0.166 0.173Note: Wave 1, the largest wave, occurs as the fourthwave. Wave 6 is the smallest wave.The main 5-day wave for each of the additional five floods, 0.2, 0.5, 2.0, 10, and 20 percent, areratios of their 5-day volumes to that of the 1 percent (100-year) 5-day volume, as shown below, andat the top of Table 11 as the “Main Wave Ratios to the 1 Percent Probability Flood.”The main wave for each frequency floodis computed first and then ratios of thatmain wave are computed to fill in theremaining 5 of the six waves. Table 11shows the entire Orestimba Creek 30-day flood, 6-wave 5-day flood seriesratios. Figure 9, Orestimba Creek nearNewman, CA, (at the damsite) showsthe main 5-day waves for the 20, 10,2.0, 1.0, 0.5, and 0.2 percent probabilityflood. An example of the six 5-daywaves (the Orestimba Creek nearNewman (ORES2) 1 percent 30-dayflood series) is shown in Figure 10. Thesame floods for Crow Creek (CROW1)are shown in Figures 11 and 12,respectively.Table 10Orestimba Creek 1 Percent Flood Hydrograph FlowsDurationUnitsFrequencyCurveFlowsAdjustedHydrographFlowsPercent ofFrequencyValuesPeak cfs 13,831 13,831 1003-day (72-hr) day-cfs 3,250 3,194 984-day (96-hr) day-cfs 2,498 2,586 1045-day (120-hr) day-cfs 2,498 2,213 897-day day-cfs 2,052 1,962 9610-day day-cfs 1,591 1,591 10015-day day-cfs 1,196 1,199 10020-day day-cfs 1,001 1,001 10025-day day-cfs 875 875 10030-day day-cfs 790 790 10028
Table 11Orestimba Creek at the Damsite30-Day Flood, 6-Wave 5-Day Flood Series RatiosMain Wave Ratios to the 1 Percent Probability FloodPercent Flood Probability 0.20% 0.5% 1.0% 2% 10% 20%Common Flood Designation 500 yr 200 yr 100 yr 50 yr 10 yr 5 yrFlood Main 5-Day Wave Ratio 1.500 1.210 1.000 0.810 0.410 0.2705-Day Wave Ratios to Their Main WaveHydrograph Ratios of main wave of the given frequency to compute the remaining 5 wavesWave WaveOrder Size* 0.20% 0.5% 1.0% 2% 10% 20%1 6 0.164 0.159 0.166 0.164 0.154 0.1412 4 0.127 0.165 0.188 0.184 0.166 0.1473 2 0.396 0.418 0.438 0.443 0.459 0.4274 1 1.000 1.000 1.000 1.000 1.000 1.0005 3 0.189 0.189 0.184 0.206 0.248 0.2476 5 0.164 0.165 0.166 0.164 0.154 0.141* Wave volumes are ranked from the largest volume to the smallest. Wave 1 is the largest waveand wave 6 is the smallest.Figure 9. Orestimba Creek near Newman, Main 5-Day Wave Flood Frequency Series29
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 22 and 23: TABLE 7Salado Creek at DamsiteFlow
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 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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