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Sacramento County Appendix G Watershed

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Sacramento County Appendix G Watershed Appendix G WATERSHED MANAGEMENT PLAN Sacramento County Appendix G.1 Local Hazard Mitigation Plan Update August 2011 SACRAMENTO COUNTY WATERSHED MANAGEMENT PLAN 2011 TABLE OF CONTENTS OVERVIEW ..................................................................................................................................................................... 4 SACRAMENTO COUNTY CRS ACTIVITY 450 – PREREQUISITE RESPONSE ..................................................................... 4 County CRS Activity 450- Prerequisites ..................................................................................................................... 6 County Watershed Master Plan (WMP) .................................................................................................................... 8 CITY OF SACRAMENTO CRS ACTIVITY 450 – PREREQUISITE RESPONSE ....................................................................... 10 City of Sacramento Watershed Master Plan (WMP) ............................................................................................... 11 SITE CONDITIONS SACRAMENTO COUNTY, CALIFORNIA ............................................................................................. 13 Average Sacramento Precipitation (inches) [www.weather.com] .......................................................................... 13 Soil Type .................................................................................................................................................................. 13 Weather History and Extremes ............................................................................................................................... 14 STANDARDS FOR DEVELOPMENT ................................................................................................................................ 14 Design Standards and Review ................................................................................................................................. 14 Hydrology Standards ............................................................................................................................................... 15 FUNDING...................................................................................................................................................................... 17 Sacramento County Funding ................................................................................................................................... 17 City of Sacramento Funding .................................................................................................................................... 18 WATERSHEDS ............................................................................................................................................................... 19 Sacramento County ................................................................................................................................................. 19 City of Sacramento .................................................................................................................................................. 20 Originating Outside Sacramento County ................................................................................................................. 21 ZONE 11A, 11B, AND 11C ............................................................................................................................................ 21 Zone 11A Drainage Master Plans ............................................................................................................................ 21 Watersheds in the Morrison Creek Stream Group: ............................................................................................. 22 Drainage studies for Zone 11A (Developing areas) ............................................................................................. 23 Drainage studies for Zone 11A (City of Elk Grove) ............................................................................................... 25 Zone 11B Drainage Master Plans ............................................................................................................................ 27 Page 2 Watersheds in the Natural Stream Group (Zone 11B) ......................................................................................... 27 Drainage studies for Zone 11B (Infill Development and Capital Improvement) .................................................. 29 Zone 11C Drainage Master Plans ............................................................................................................................ 31 Watersheds in the Dry Creek Stream Group ....................................................................................................... 31 Drainage studies for Zone 11C (Developing Areas, and Areas in Need of Improvement) ................................... 32 LIMITED LAND USE AREAS ........................................................................................................................................... 33 Natomas .................................................................................................................................................................. 33 South County Agricultural Areas ............................................................................................................................. 34 Drainage Studies .................................................................................................................................................. 35 COOPERATIVE TECHNICAL PARTNERSHIPS AND WATERSHED AGREEMENTS ............................................................. 35 Sacramento County and Placer County ................................................................................................................... 35 Sacramento County and City of Sacramento .......................................................................................................... 36 Sacramento County and City of Rancho Cordova ................................................................................................... 36 Sacramento County and City of Elk Grove .............................................................................................................. 37 County of Sacramento and City of Citrus Heights ................................................................................................... 37 City of Folsom .......................................................................................................................................................... 37 City of Galt ............................................................................................................................................................... 38 City of Isleton .......................................................................................................................................................... 38 CITY OF SACRAMENTO ................................................................................................................................................. 38 Natomas Area .......................................................................................................................................................... 38 Drainage Studies ..................................................................................................................................................... 39 STORMWATER AND WATERSHED MANAGEMENT ...................................................................................................... 40 ATTACHMENTS ............................................................................................................................................................ 41 Page 3 SACRAMENTO COUNTY NFIP COMMUNITY 060262 WATERSHED MANAGEMENT PLAN OVERVIEW Sacramento County lies mostly in the trough of the Sacramento Valley in the northern portion of the Central Valley of California. The county is bound on the east by the Sierra Nevada foothills and extends to the southwest into the Sacramento Delta. The county totals 994 square miles and has seven incorporated cities. Herein, unincorporated Sacramento County and the Zone 11 drainage shed areas including the cities of Elk Grove, Rancho Cordova, and Citrus Heights, and Sacramento County Water Agency Zone 11 will simply be referred to as County, There are seven incorporated cities in the County of Sacramento including: Sacramento Isleton Folsom Galt Citrus Heights Elk Grove Ranch Cordova The total population of Sacramento County (2010) is 1,418,788. And, there are two adjacent counties that have creek watersheds draining into Sacramento County. Sacramento County Flood Insurance Rate Maps were first issued March 15, 1979 and the county has continuously been a community in good standing with the National Flood Insurance Program. Each city has a FEMA NFIP community number and an independent relationship with the NFIP. The FEMA Community Rating System (CRS), under the insurance services office recommends watershed management planning that is not limited to corporate boundaries. Under CRS Activity 450, a participating community may receive points toward improved rating and lowered flood insurance premiums for preparing a plan such as this and updating that plan every five years. SACRAMENTO COUNTY CRS ACTIVITY 450 – PREREQUISITE RESPONSE Stormwater and Floodplain Management Planning has been County policy since March
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