PART 3 • 3.3 Hydrology • 3.3.3 Groundwater Hydrology 333

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Ventura Data Sources: CDWR Bulletin 118, Kear Groundwater, Ventur a River Ventura County Watershed Protection District, Estuary ¤£101 Ojai Basin GMA, Daniel B. Stephens & Associates, Inc. Miles Map Created by GreenInfo Network using Esri software, Jan. 2015 www.greeninfo.org ¯ 0 0.5 1 2 3 4 Groundwater Basins

Ventura River Watershed Sq. Shallow Depth Max. Avg. Well Active Approx. Groundwater Basin Acres Mi. to Water (ft.) Capacity Yield Wells Safe Yield Upper Ojai 2,840 4.4 0-40 5,681 AF 50 gpm 95 Unavail.

Ojai Valley 6,471 10.1 0-80 85,000 AF 383 gpm 149 5,026 AF a - Represents unconsolidated alluvium b - Preliminary estimate, based Upper Ventura River 9,360 14.6 0-5 35,118 AF 600 gpm 160 9,482 AF on groundwater balance for water years 1997-2007

6,090 9.5 3-13 8,743 AF a 20 gpm 16 2,130 AF b Source: Daniel B. Stephens & Lower Ventura River Associates, Inc. 2010 & 2013

Figure 3.3.3.2 Groundwater Basins Map Data sources: See Table 3.4.2.1.3 Groundwater Basins Map Data Sources in “3.4.2 Water Supplies” for an explanation of the various data in the table. 1 Oxnard Plain Pressure 2 Fillmore 3 Santa Paula 4 Piru 5 Pleasant Valley 6 Mound 7 East Las Posas 12 8 West Las Posas 9 Oxnard Plain Forebay 10 South Las Posas 31 11 Lower Ventura River 12 Cuyama Valley Cuyama River 13 Mugu Forebay Watershed 14 Simi Valley 19 23 15 Thousand Oaks 16 Tapo Gillibrand 17 Arroyo Santa Rosa 18 Ojai Valley 19 Lockwood Valley 20 Tierra Rejeda Valley 21 Upper Ventura River 22 South Coast 23 Hungry Valley 29 24 Russell Valley 25 Conejo Valley 26 North Coast 28 Upper Ojai Santa Clara 29 Mutau Flat 30 Sherwood River Watershed 31 Little Cuddy Valley Ventura River 32 Las Virgenes Cyn Watershed

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30 24 Malibu Creek Groundwater Basins 13 22 Watershed Boundaries Subwatersheds 22 Sources: Esri, DeLorme, NAVTEQ, TomTom, Intermap, iPC, USGS, FAO, NPS, NRCAN, GeoBase, IGN, Kadaster NL, Ordnance Survey, Esri Japan, METI, Esri China (Hong Kong), and the GIS User Community

0 2 4 8 Miles Ventura County Figure 3-8 Resource Management Agency Disclaimer: this map was created by the Ventura County Resource Management Agency, Mapping Services - GIS, which is designed Information Systems Department Groundwater Basins and operated solely for the convenience of the County and related Map created on 04/07/2014 public agencies. The County does not warrant the accuracy of this map and no decision involving a risk of economic loss or physical É injury should be made in reliance therein WCVC IRWM Region JM 248 VENTURA RIVER WATERSHED MANAGEMENT PLAN

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O Data Source: Hydrologic Data: Ventura Watershed Protection District Map Created by GreenInfo Network using Esri software Jan. 2015 www.greeninfo.org

Figure 3.3.1.1.1 Drainage Network Map