Orestimba Creek Hydrology - Stanislaus County

Orestimba Creek HydrologyA Reevaluation Based on Updated Peak and Volume Frequency CurvesTABLE OF CONTENTS1. Purpose and Scope ................................................................................................................. 32. General Drainage Area: Stream Descriptions and Climate ................................................... 53. Flow Frequency Curves ......................................................................................................... 7Del Puerto Creek near Patterson................................................................................ 8Orestimba Creek near Newman.................................................................................12Salado Creek above I-5..............................................................................................184. Flood Hydrographs ................................................................................................................21Concurrent Flows.......................................................................................................315. Summary and Recommended Use of Flood Frequency Analysis and Flood Hydrographs ..326. References..............................................................................................................................34List of Tables1. Summary of FFA Results, Del Puerto Creek near Patterson................................................. 92A. Del Puerto Creek near Patterson, Flow Duration, Peak through 7-Day ................................102B. Del Puerto Creek near Patterson, Flow Duration, 10-Day through 30-Day ..........................113. FFA Statistical Output before Screening Input for Orestimba Creek....................................134. FFA Results for Orestimba Creek..........................................................................................145A. Orestimba Creek near Newman, Flow Duration, Peak through 7-Day .................................165B. Orestimba Creek near Newman, Flow Duration, 10-Day through 30-Day ...........................176. FFA Results, Salado Creek above I-5....................................................................................197. Salado Creek at Damsite, Flow Duration ..............................................................................208. Report Hydrograph Names and Drainage Areas ...................................................................239. 1 Percent 30-Day Flood Series for Orestimba and Crow Creeks, Ratios of MainWaves Used to Develop 30-Day Series.................................................................................2810. Orestimba Creek 1 Percent Flood Hydrograph Flows...........................................................2811. Orestimba Creek at the Damsite, 30-Day Flood, 6-Wave 5-Day Flood Series Ratios..........2912. 1 Percent 30-Day Flood Series for Orestimba Creek Subareas, Ratios of Main WaveUsed to Develop 30-Day Series.............................................................................................3113. Orestimba Creek near Newman, Comparison of 2001 West Stanislaus Feasibility StudyFlow Values with the 2008 Updated Flows...........................................................................33List of Figures1. General Map........................................................................................................................... 42. Del Puerto Creek near Newman, Means versus Standard Deviations................................... 93. Orestimba Creek Statistics, Means versus Standard Deviation.............................................144. Translation of average natural flows from frequency curves to synthetic rain floodhydrographs. The 5-day pattern obtained from the 96hour storm is repeated to form a30-day series ..........................................................................................................................225. Subarea Map ..........................................................................................................................246. Orestimba Creek HMS Model Routing Diagram ..................................................................257. Orestimba Creek Flood Volume Mass Curves and Tabulation .............................................261