Los angeles county hydrology manual

Project Site is not within a flood protection district as designated by Los Angeles County, or 108 City of Los Angeles Storm Drain Design Manual. 109 National Flood Insurance Program Flood Insurance Rate Maps 060137-0046 C, dated May 4, 1999 and 065043-0810 B, dated December 2, 1980. A. Surface Water Hydrology County of Los Angeles Hydrology Manual The City of Burbank refers to the Los Angeles County Department of Public Works Hydrology Manual as its basis of design for storm drainage facilities. The Hydrology Manual requires that a storm drain conveyance system be designed for a 25- year storm event and that The methodology described in the Los Angeles County Hydrology Manual was used to compute stormwater run-off discharge and volume rates from the project site and from any off-site areas Rainfall data pertaining to the 50-year storm event, as obtained thru Los Angeles County GIS Data portal, and runoff and Time of Concentration LOS ANGELES COUNTY DEPARTMENT OF PUBLIC WORK HYDROLOGY MANUAL E N G I N E E R S I N C QUALITY Alhambra Orange County 1041 S. Garfield Avenue, Suite #210 2151 Michelson Dr. # 242, Irvine, CA 92612 Alhambra, CA 91801 Tel: 949-679-0870(x102) Fax: 949-679-9370 Tel: 323-729-6098 Fax: DRAFT HYDROLOGY AND WATER QUALITY TECHNICAL MEMORANDUM LOS ANGELES ZOO VISION PLAN ENVIRONMENTAL IMPACT REPORT Prepared By: 3371 Glendale Blvd, Ste 208 Los Angeles, California 90039 Jennifer J. Walker, Principal PE, DWRE, ENV SP, CFM, QSD PE License #C77079 Angeles County Department of Public Works Hydrology Manual 50-year Capital Storm event days 1-4 to size the basin and the 25-year Urban Storm Event day 4 to size the storm drain system. 2. The State of California Regional Water Quality Control Board Los Angeles Region Waste the storm events, based on factors from the LA County Hydrology Manual in Table 5.3.1, are as listed: 5-Year 24-Hour: 4.32-inches 10-Year 24-Hour: 5.28-inches 25-Year 24-Hour: 6.49-inches 50-Year 24-Hour: 7.40-inches 4 100-Year 24-Hour: 8.30-inches Discharges within the Coastal Watersheds of Los Angeles County, Except those Discharges Originating from the City of Long Beach MS4 (CAS004001, Order No. R4-2012-0175). November 8, 2012. County of Los Angeles. Hydrology Manual, January 2006. City of Claremont Stormwater and Runoff Pollution Control Ordinance, Chapter 8.28. Structural Design Manual. Construction Manual. Project Delivery Manual. Stormwater Pollution Abatement Handbooks and Publications. Approved Products and Materials Lists. Injury and Illness Prevention Program. Sewer Design Manual. Survey Manual. Los Angeles County Hydrology & Sedimentation Manuals. the LA County Hydrology Manual in Table 5.3.1, are as listed: • 5-Year 24-Hour: 3.33-inches • 10-Year 24-Hour: 4.07-inches Soils: The soil of the watershed is classified as Type 012, as shown in the Hydrology Map from the Los Angeles County Department of Public Works (LACDPW) website (see section 6.0 for map). If you see a County storm drainage system in need of maintenance, contact the County Department of Public Works Field Operations staff at (619) 443-1260 weekdays or contact the Stormwater Hotline at 1 (888) 846-0800. For after-hours emergencies contact (858) 565-5262. COUNTY OF SAN DIEGO.