County of Los Angeles Department of Public Works

This report discusses hydrologic data relative to Los Angeles County. Precipitation, runoff, water levels and water conservation are detailed in annual reports developed electronically for water years 1996 to 2007.
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2006 HYDROLOGY MANUAL:

The 2006 Hydrology manual serves as a guide for hydrologic studies within Los Angeles County. The manual contains current standards and procedures, examples, runoff coefficient charts, and maps of rainfall isohyets and soil types. (PDF)
View Document	Download Entire Doc. (125 MB)	Download Sections Title Page & TOC (196 KB) Chp. 1-5 (2.5 MB) Chp. 6-10 (1.2 MB) Chp. 11-Index (652 KB) Appendix A (12 KB) Appendix B (36 MB) Appendix C (839 KB) Appendix D (19 KB)

SEDIMENTATION MANUAL, SECOND EDITION:

This manual establishes the Los Angeles County Department of Public Works' policies, standards and procedures for development of the Santa Clara River, calculating debris production, sediment transport, and design of channels influenced by sedimentation. This edition of the Manual contains updated references to the 2006 Hydrology Manual. (PDF)
View Document	Download Entire Doc. (127 MB)	Download Sections Manual (4.5 MB) Appendix A (344 KB) Appendix B (33 MB) Appendix C (2.3 MB) Appendix D (869 KB) Appendix E (17 KB) Appendix F (12 KB)

MODIFIED RATIONAL METHOD HYDROLOGY SUPPORT FILES:

The files contain design storm data, information associated with land use and soil types, and other support files that can be used with approved software. The data included in these files are to be used in accordance with the methods, standards and procedures detailed in the 2006 Hydrology Manual and the Sedimentation Manual, Second Edition. All files are in zip format.

   TC Calculator
   MODRAT Support Files
   Rain Depth
   Soil Types
   Land Use 2005

HYDRAULIC DESIGN MANUAL:

This manual establishes the Los Angeles County Department of Public Works' Hydraulic Design Procedures. Last update March 2002. (PDF)
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WATER SURFACE PRESSURE GRADIENT (WSPG) USERS MANUAL:

WSPG is a hydraulic analysis system that computes and plots uniform and non-uniform steady flow water surface profiles and pressure gradients in open channels or closed conduits with irregular or regular sections. Last update March 2002. (PDF)
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THE 85th PERCENTILE 24-HR RAINFALL:

Spatial Distribution Analysis required selection of gages to represent rainfall throughout the county. (PDF)
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SAN GABRIEL RIVER AND MONTEBELLO FOREBAY WATER CONSERVATION SYSTEM:

Maximizing water conservation capabilities to maintain the County's vital supply of groundwater.
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SEAWATER BARRIER ANNUAL OPERATIONS REPORTS:

Annual operations reports for West Coast Basin Barrier, Dominquez Gap Barrier, and Alamitos Barrier projects.
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