Local Hazard Mitigation Plan.pdf - Sonoma County Water Agency ...

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• The draft hazard mitigation plan presented to the Agency’s contractors for review and comment as follows: o City of Santa Rosa, October, 2007 o City of Sonoma, October, 2007 o City of Petaluma, October, 2007 o Town of Windsor, October, 2007 o City of Rohnert Park, October, 2007 o City of Cotati, October, 2007 o North Marin Water District, October, 2007 o Valley of the Moon Water District, October, 2007 • The draft hazard mitigation plan presented to the Agency’s Board of Supervisors on January 8, 2008 for review, comment and formal adoption. No comments on the Plan were received from the public. Several minor comments were received from the Agency’s contractors which were incorporated into the Plan. 1.4 PLAN ADOPTION This plan was formally adopted by the Sonoma County Water Agency Board of Supervisors on January 8, 2008. The formal resolution of adoption is included in Appendix B. 6 Local Hazard Mitigation Plan 1-18-08.doc
2.0 SONOMA COUNTY WATER AGENCY FACILITIES 2.1 WATER SUPPLY SYSTEM The Agency’s water system is shown in Figure 1 and Figure 1a. The primary source of water for the Agency’s water supply system is a ground water aquifer located in the Mirabel Park area just north of the town of Forestville. The aquifer is located adjacent to the Russian River and receives water from the river by natural filtration through an approximately 60 feet thick sand and gravel riverbed. Water from the aquifer is pumped by six Ranney type collector wells and released into 83 miles of large diameter pipelines (aqueducts) that transmit water throughout the Agency’s service area. Three out of the six collectors are located along the eastern bank of the river in the Wohler area and are referred to the Wohler collectors, while the remaining three are located along the western bank of the river in the Mirabel area and are known as the Mirabel collectors. On the average, the Mirabel and Wohler collectors can provide a sustained flow of approximately 15 mgd each. In addition to the collector wells, the water supply system has ten conventional wells (with an average sustained flow of 7 mgd) that supplement the water supply from the collectors. Seven of these wells are located along the Russian River in the general vicinity of the collectors, while the remaining three are located in the Laguna De Santa Rosa area near Sebastopol. The transmission system has eight booster pump stations that provide the necessary head to move the water through the system. Water storage is provided by 18 steel storage tanks with a collective storage capacity of 128.8 million gallons. The Agency also maintains two major reservoirs impounded by two large dams (heights of 319 feet and 160 feet), an inflatable rubber dam, a system of ditches, infiltration ponds and a dike, three water treatment facilities, an electric power substation, a hydroelectric plant, and several emergency power generators. The key facilities that constitute Agency’s water supply system are summarized below: • Russian River system – includes the Russian River, the Russian River aquifer and the Warm Springs and Coyote Valley dams (319 feet high and a 164 feet high earth-fill embankment dams). • Diversion system – includes collector wells, inflatable dam, River Diversion Structure (RDS), Mirabel well field, dikes and diversion channels in the Wohler-Mirabel area and infiltration ponds. • Transmission system – includes all of the Agency’s aqueducts that transport water from the Agency’s diversion system facilities to storage and to its contractors. • Storage system – includes 18 storage tanks that provide 128.8 million gallons of storage. 7 Local Hazard Mitigation Plan 1-18-08.doc
Page 2 and 3: TABLE OF CONTENTS ii Page 1.0 INTRO
Page 4 and 5: TABLES Table 1 Table 2 Table 3 Tabl
Page 6 and 7: contractors maintain some local sou
Page 8 and 9: 1.3.1 Water System Reliability Stud
Page 12 and 13: • Pumping facilities - includes 8
Page 14 and 15: The Agency provides maintenance ser
Page 16 and 17: 3.1 EARTHQUAKE HAZARD 3.0 HAZARD AS
Page 18 and 19: ooster stations. The fault is well
Page 20 and 21: the County are exposed to long dura
Page 22 and 23: 1 February 18, 1986 48.56 2 January
Page 24 and 25: fluids within the soil. These facto
Page 26 and 27: Table 3 shows some of the major fir
Page 28 and 29: prior to 1900 are minimal. Multi-ye
Page 30 and 31: Blowing Dust November 2, 1994 5:21
Page 32 and 33: Risk to the Agency’s facilities f
Page 34 and 35: 4.1.1 Russian River System The prim
Page 36 and 37: strap joints. Most river and stream
Page 38 and 39: 4.1.7 Supplementary Water Sources I
Page 40 and 41: • Facilities at the Sea Ranch San
Page 42 and 43: Based on the insights obtained from
Page 44 and 45: Objective 1.6: Improve the Agency
Page 46 and 47: 6.0 IMPLEMENTATION STRATEGY For the
Page 48 and 49: grants program (HMGP), Agency’s m
Page 50 and 51: of the elected Councils and Boards
Page 52 and 53: 18 Local Hazard Mitigation Planning
Page 54 and 55: 43 The Tornado Project http://www.t
Page 56 and 57: S. No Name of the File Year 13. Spe
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