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Basin Conceptual Model for Centro and
Relevant Experience:
Baja Management Subareas, Mojave
 Hydrogeologic conceptual model for two
management subareas River Groundwater Basin, Mojave
 Evaluation of hydrogeologic data for Water Agency, San Bernardino County
8,000+ study area wells
 Analysis of surface water‐groundwater Mojave Water Agency (MWA) is responsible for managing
interaction the adjudicated Mojave River Groundwater Basin. Since
 Development of subarea‐wide water the 1950s, groundwater levels in the basin have declined
budgets covering 80 years due to historical overproduction. Although a physical
 Application of regional USGS solution was developed in 1995, water level declines have
groundwater flow model continued in downgradient portions of the basin, where
 Evaluation of existing recharge groundwater use exceeds the natural supply. In 2010,
operations using SWP water MWA selected Todd Groundwater to develop a basin
conceptual model of the Centro and Baja management
Active Dates: 2010‐2013
subareas, which represents the lower Mojave River Basin
Budget: $435,000 region. These two subareas cover over 2,500 mi and
2
Reference: include the cities of Barstow, Lenwood, and Newberry
Mr. Lance Eckhart Springs and communities such as Hinkley.
Director of Basin Management and The project involved the synthesis of documents and data
Resource Planning compiled over more than 80 years. Data sets included over
Mojave Water Agency 10,000 water level measurements, 75,000 water quality
760.946.7015
leckhart@MojaveWater.org records, 150,000 streamflow measurements, production
records for more than 250 wells, and 8,000 lithologic logs.
Key Staff: Detailed geologic cross sections, aquifer parameter
Edwin Lin, Phyllis Stanin estimation, streamflow and water level trend analyses,
water quality source diagramming, and subarea water
budgets were completed and documented in a final project report. Meetings with Subarea Advisory
Groups were held to ensure key issues were addressed. Water budgets from the regional USGS Mojave
River Basin model were compare with independent analyses. The study has provided MWA with the
technical foundation needed to manage these subareas within the context of the physical solution
identified in the Mojave Basin Area Adjudication.
Phyllis Stanin was the Project Manager with Edwin Lin as Lead Hydrogeologist.

TODD GROUNDWATER

Yucaipa Sustainable Groundwater Management Agency - August 9, 2018 - Page 172 of 208