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Name:	Elsinore Valley Municipal Water District
Address:	31315 Chaney Street
City:	Lake Elsinore	Zip:	92530
Phone(Work):	(951) 674-3146	Phone(Cell):
Email:	gkrishnamurthy@evmwd.net	Fax:

Name:	Ganesh Krishnamurthy
Address:	31315 Chaney Street
City:	Lake Elsinore	Zip:	92530
Phone(Work):	(951) 674-3146	Phone(Cell):
Email:	gkrishnamurthy@evmwd.net

General information regarding potential basin boundary modification process is posted or will be posted.

• http://www.evmwd.com/about/departments/water_resources/elsinore_basin_boundary_revision.asp

• The Elsinore Valley Municipal Water District (EVMWD) has long managed the groundwater resources of the Elsinore Valley, including most of the DWR-designated Elsinore Basin. The DWR description of the Elsinore Basin identifies the alluvial material mapped by the USGS. However, the area of the basin mapped by DWR is not well-aligned with the alluvium currently represented in USGS maps. EVMWD is coordinating with the City of Corona (City) and Temescal Valley Water District (TVWD) (formerly Lee Lake Water District) to explore a potential basin boundary modification request from DWR to realign the existing Elsinore Basin boundaries to match the alluvium of the Elsinore Valley and Temescal Wash areas. This boundary modification request would also include creation of a new groundwater basin covering the northwestern portion of the Elsinore Basin from which Corona and EVMWD pump groundwater. This area is within the Temescal Wash watershed, locally referred to as the Bedford-Coldwater area. Notification of the intent to explore a basin boundary modification request is being submitted to DWR in accordance with the requirements of the Sustainable Groundwater Management Act of 2014 (SGMA). EVMWD, Corona, and TVWD plan to submit a single request for boundary modifications, as required by DWR. The basin boundary modification request will document the benefits and need for the Elsinore Basin boundary modifications and creation of the new Bedford-Coldwater Basin. The Elsinore Basin and proposed new Bedford-Coldwater Basin boundaries would be modified to align with the alluvial deposits as mapped by the USGS, resulting in better correlation between the description in DWR Bulletin 118 and the mapped basins. Groundwater within Elsinore Basin and the proposed Bedford-Coldwater Basin is hydraulically connected primarily beneath a narrow channel of the Temescal Wash, and to a limited extent through shallow upland alluvial material. This limited connection provides a natural break for a basin boundary in a location that general separates two regional groundwater flow regimes. Although some groundwater flow occurs across this boundary towards the Bedford-Coldwater area, most of the groundwater in the Elsinore Basin flows towards the basin center. Groundwater flow north of this boundary is primarily towards the northwest and the center of the proposed Bedford-Coldwater Basin. The canyon contains shallow bedrock and thin alluvial sediments, which restrict the volume of subsurface inflow across the boundary. Recharge within the both the Elsinore Basin and the Bedford-Coldwater area occurs primarily from runoff in adjacent hills east and west of the area rather than from flow between these distinct groundwater areas. The Elsinore Basin south of the Bedford-Coldwater area is within the service area of the EVMWD, but the Bedford-Coldwater area is outside of EVMWD. The TVWD and City service areas cover almost all of the Bedford-Coldwater area; those portions outside of these service areas are not within the service area of any local water agency. EVMWD, the City, and TVWD will coordinate with Riverside County for these currently unmanaged areas as required under SGMA. EVMWD, in coordination with the City and TVWD, has long been responsible for managing groundwater conditions in the Bedford-Coldwater area in accordance with legal agreements with the City of Corona for managed withdrawals from the Coldwater area. Creation of this new basin would allow the area to be managed separately from the remainder of the current Elsinore Basin. This arrangement would facilitate activities for sustainable management of the groundwater within the Bedford-Coldwater area. The modified basin boundary will be more consistent with both the hydrogeologic structure and historical and ongoing management of this shared groundwater resource. A map that shows the current and proposed basin boundaries can be accessed below.

• 8-004 ELSINORE

Uploaded document: Elsinore Basin Boundary Modification Map 2-11-16.pdf