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Calleguas Creek US Army Corps Of Engineers Los Angeles District Ventura and Los Angeles Counties, California CALLEGUAS CREEK WATERSHED FEASIBILITY STUDY HYDROLOGY APPENDIX Prepared by: U.S. Army Corps of Engineers Los Angeles District February 2003 CALLEGUAS CREEK, VENTURA & LOS ANGELES COUNTIES, CA WATERSHED STUDY CALLEGUAS CREEK WATERSHED FEASIBILITY STUDY HYDROLOGY APPENDIX February 2003 Table of Contents Section Page 1. Introduction................................................................................................................................. 1 2. Purpose and Scope ...................................................................................................................... 1 3. Prior Studies and Reports............................................................................................................ 1 4. Description of the Drainage Area ............................................................................................... 4 4.1. General......................................................................................................................... 4 4.2. Calleguas Creek at Pacific Coast Highway ................................................................. 5 4.3. Mugu Lagoon............................................................................................................... 5 4.4. Runoff Characteristics ................................................................................................. 5 4.5. Existing Water Related Structures............................................................................... 6 4.6. Vegetation.................................................................................................................... 6 4.7. Land Use ...................................................................................................................... 7 4.8. Geology........................................................................................................................ 7 4.9. Soils.............................................................................................................................. 8 5. Precipitation and Runoff............................................................................................................. 8 5.1. Precipitation Records................................................................................................... 8 5.2. Streamflow Records..................................................................................................... 9 5.3. Climatology and Meteorology ..................................................................................... 9 5.3.1. Storms ........................................................................................................... 9 5.3.1.1. General Winter Storms .................................................................. 9 5.3.1.2. Local Storms .................................................................................. 9 5.3.1.3. General Summer Storms................................................................ 9 5.3.2. Storms and Floods of Record........................................................................ 9 6. Discharge-Frequency Analysis ................................................................................................. 14 7. Rainfall-Runoff Analysis.......................................................................................................... 16 7.1. Subarea Delineation................................................................................................... 17 7.2. Precipitation ............................................................................................................... 17 7.3. Precipitation Loss Rates............................................................................................. 17 7.4. Impervious Cover....................................................................................................... 18 7.5. Unit Hydrographs....................................................................................................... 18 7.6. S-Graph...................................................................................................................... 19 7.7. Base Flow................................................................................................................... 19 7.8. Flood Routing ............................................................................................................ 19 ii Calleguas Creek Watershed Study U.S. Army Corps of Engineers Hydrology Appendix.doc FINAL November 2002 Table of Contents Section Page 8. Future Conditions ..................................................................................................................... 19 9. Natural Conditions.................................................................................................................... 19 10. Summary and Results ............................................................................................................. 20 List of Tables Table 1. Pertinent Data for Las Llajas Canyon Dam and Sycamore Dam 2. VCFCD Facilities in the Calleguas Creek Watershed 3. Precipitation Gages in and around Calleguas Creek Watershed 4. Stream Gages in and around Calleguas Creek Watershed 5. Discharge-Frequency Results for Gaged Locations 6. Preliminary Statistics for Gaged Locations in Calleguas Creek Watershed 7. Final Statistics for Gaged Locations in Calleguas Creek Watershed 8. Subarea Characteristics for HEC-HMS Models 9. Point Precipitation Frequency for Calleguas Creek Watershed 10. Loss Rates and Percent Impervious Cover - Calleguas Creek Watershed 11: Routing Parameters for HEC-HMS Models 12: Discharge Frequency Results at Selected Locations in the Calleguas Creek Watershed 13: Comparison of Discharge Frequency Results at Selected Locations in the Calleguas Creek Watershed iii Calleguas Creek Watershed Study U.S. Army Corps of Engineers Hydrology Appendix.doc FINAL November 2002 List of Figures Figure 1: Location Map – Calleguas Creek Watershed, Ventura and Los Angeles Counties, CA Figure 2: Location Map – Mugu Lagoon, Calleguas Creek Watershed, CA Figure 3: Precipitation and Stream Gage Locations - Calleguas Creek Watershed, CA Figure 4: Average Annual Precipitation – Calleguas Creek Watershed Figure 5: Discharge-Frequency Curves – Calleguas Creek Mainstem Figure 6: Discharge-Frequency Curves – Conejo Creek and Revolon Slough Figure 7: Discharge-Frequency Curve – Arroyo Simi above White Oak Figure 8: Discharge-Frequency Curve – Arroyo Simi at Royal Ave. Figure 9: Discharge-Frequency Curve – Arroyo Simi at Madera Rd. Figure 10: Discharge-Frequency Curve – Arroyo Simi at Moorpark Figure 11: Discharge-Frequency Curve – Calleguas Creek above Highway 101 Figure 12: Discharge-Frequency Curve – Calleguas Creek at CSUCI Figure 13: Discharge-Frequency Curve – Arroyo Conejo above Ventu Park Rd. (South Branch) Figure 14: Discharge-Frequency Curve – Arroyo Conejo below Conejo Blvd. Figure 15: Discharge-Frequency Curve – Conejo Creek above Highway 101 Figure 16: Discharge-Frequency Curve – Revolon Slough at Laguna Rd. Figure 17: Schematic Diagram – HEC-HMS Model – Lower Portion of Calleguas Creek Watershed Figure 18: Schematic Diagram – HEC-HMS Model – Upper Portion of Calleguas Creek Watershed Figure 19: Subarea Boundaries – HEC-HMS Model - Lower Portion of Calleguas Creek Watershed Figure 20: Subarea Boundaries – HEC-HMS Model - Upper Portion of Calleguas Creek Watershed iv Calleguas Creek Watershed Study U.S. Army Corps of Engineers Hydrology Appendix.doc FINAL November 2002 List of Figures (cont.) Figure 21: Depth-Area-Reduction Curve Figure 22: Lag Relationship – for HEC-HMS Models – Calleguas Creek Watershed Figure 23: S-Graph Used In HEC_HMS Models – Calleguas Creek Watershed Figure 24: 100-year hydrographs on Calleguas Creek at Mugu Lagoon (CP-141) for Existing, Future, and Natural Conditions Figure 25: 100-year hydrographs on Conejo Creek above Calleguas Creek (CP-28) for Existing, Future, and Natural Conditions List of Exhibits A. Calleguas Creek Stream Gage Photographs B. Calleguas Creek Watershed Photographs v Calleguas Creek Watershed Study U.S. Army Corps of Engineers Hydrology Appendix.doc FINAL November 2002 Calleguas Creek Watershed Feasibility Study 1. Introduction. The hydrology presented in this appendix is intended to be a part of the overall Calleguas Creek Feasibility Study, which is prepared in part by the Corps of Engineers, Los Angeles District, Ventura County Watershed Protection District (formerly Ventura County Flood Control District), Dr. Howard Chang, and Nolte Engineers. The primary focus of the Calleguas Creek Watershed Feasibility Study is to determine the impact of sediment entering Mugu Lagoon and what environmental restoration measures might be implemented to minimize the impact. The challenge of determining the impacts of sediment entering Mugu Lagoon can best be accomplished using a watershed approach. The watershed approach is used because it considers all activities within the watershed that may or may not have an impact on sedimentation and the transport of this sediment to and through Mugu Lagoon. The focus of this study is to develop discharges for that area of Calleguas Creek from Hitch Blvd. to Mugu Lagoon, as well as the lower portion of Conejo Creek. The hydrologic work effort for this study included a review of previous studies on the watershed. Streamgage data from the United States Geological Survey (USGS) and Ventura County was analyzed to
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