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Los Angeles County Watershed Model Configuration and Calibration—Part I: Hydrology

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Los Angeles County Watershed Model Configuration and Calibration—Part I: Hydrology Los Angeles County Watershed Model Configuration and Calibration—Part I: Hydrology Submitted to: County of Los Angeles Department of Public Works Watershed Management Division 900 South Fremont Avenue, 11th Floor Alhambra, CA 91803-1331 Submitted by: Tetra Tech, Inc. 3475 East Foothill Boulevard Pasadena, CA 91107 August 6, 2010 Los Angeles County Watershed Model Configuration and Calibration – Part I ii Los Angeles County Watershed Model Configuration and Calibration – Part I Contents Introduction .......................................................................................................................................... 1 Scope of This Report ..............................................................................................................................................3 Expected Outcomes ...............................................................................................................................................4 Model Selection ................................................................................................................................... 5 Modeling Approach ............................................................................................................................. 7 Watershed Segmentation .......................................................................................................................................7 Hydrologic Response Units Development ........................................................................................................... 11 Hydrologic Soil Group and Slope ........................................................................................................................ 17 Meteorological Data ............................................................................................................................................. 27 Hydrologic Modifications .................................................................................................................. 41 Spreading Grounds .............................................................................................................................................. 41 Reservoirs ............................................................................................................................................................ 45 Point Sources..................................................................................................................................... 53 Hydrology Data Review ..................................................................................................................... 56 Ballona Creek Summary ...................................................................................................................................... 58 Dominguez Channel Summary ............................................................................................................................ 59 Los Angeles River Summary ............................................................................................................................... 59 Malibu Creek Summary ....................................................................................................................................... 59 San Gabriel River Summary ................................................................................................................................ 59 Santa Clara River Summary ................................................................................................................................ 59 Hydrology Calibration ....................................................................................................................... 60 Location 1: Elderberry Canyon above Castaic Creek (Vacant Steep Slope D) .................................................. 61 Location 2: Fish Creek above Castaic Creek (Vacant Steep Slope C) ............................................................... 67 Location 3: Castaic Creek above Fish Creek (Vacant Steep Slope A & B) ........................................................ 74 Locations 4 and 5: Whittier Narrows Dam (Irrigation and Hydromodification) .................................................... 79 Locations 6: Los Angeles River above Long Beach, California, (Validation and Point Source Influence) .......... 86 Summary of the Hydrology Calibration and Validation Process .......................................................................... 91 Next Steps .......................................................................................................................................... 94 References ......................................................................................................................................... 95 Appendix A – Quality Control Process Summary for Precipitation Data ....................................... 96 NCDC Hourly Precipitation Gages ...................................................................................................................... 96 NCDC Summary of the Day Precipitation Gages .............................................................................................. 104 LACDPW Daily Precipitation Gages .................................................................................................................. 116 LACFCD Daily Precipitation Gages ................................................................................................................... 119 Appendix B – Quality Control Process Summary for Pan Evaporation Data .............................. 171 Appendix C – Precipitation Station Inventory ................................................................................ 179 iii Los Angeles County Watershed Model Configuration and Calibration – Part I Appendix D – Point Source Data Review ....................................................................................... 184 Tapia Water Reclamation Facility ...................................................................................................................... 184 Burbank Water Reclamation Plant .................................................................................................................... 184 Malibu Mesa Wastewater Reclamation Plant .................................................................................................... 184 West Basin Municipal Water District .................................................................................................................. 185 Joint Water Pollution Control Plant .................................................................................................................... 185 La Cañada Water Reclamation Plant ................................................................................................................ 185 Long Beach Water Reclamation Plant ............................................................................................................... 186 Los Coyotes Water Reclamation Plant .............................................................................................................. 186 Pomona Water Reclamation Plant .................................................................................................................... 186 San Jose Water Reclamation Plant ................................................................................................................... 187 Whittier Narrows Water Reclamation Plant ....................................................................................................... 187 Saugus Water Reclamation Plant ...................................................................................................................... 187 Valencia Water Reclamation Plant .................................................................................................................... 188 Hyperion Treatment Plant .................................................................................................................................. 189 Terminal Island Water Reclamation Plant ......................................................................................................... 190 Donald C. Tillman Water Reclamation Plant ..................................................................................................... 190 Los Angeles-Glendale Water Reclamation Plant .............................................................................................. 191 Appendix E – Inventory of Hydrological Monitoring Stations ...................................................... 192 Appendix F – Hydrology Calibration Graphs and Tables .............................................................. 198 iv Los Angeles County Watershed Model Configuration and Calibration – Part I Tables Table 1. Summary of model authors and models .......................................................................................................3 Table 2. Summary of watershed segmentation and land use data source ................................................................3 Table 3. Numbering convention blocks for each of the major regional watersheds ................................................ 11 Table 4. Land use and average percent imperviousness distribution in LA County regional watersheds .............. 12 Table 5. Land use and percent HSG area distribution in LA County regional watersheds ..................................... 18 Table 6. Land use and average slope (less
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