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Hydraulic Control Monitoring Program
Santa Ana River in the Watershed
Chino Basin Watermaster /
Inland Empire Utilities Agency
The Chino Basin Watermaster (CBWM), a consensus-based organization that facilitates the development and utilization of the Chino Basin, and the Inland Empire Utilities Agency (IEUA), which was originally named the Chino Basin Municipal Water District, are co-permittees for the recharge of recycled water in the Chino Basin. They have obligations codified in the 2004 Basin Plan Amendment that require them to manage the Chino Basin by eliminating groundwater outflow to the Santa Ana River from the main part of the Chino Basin. The elimination of groundwater outflow is referred to as hydraulic control.
WEI developed operating strategies for the Chino Basin that ensure hydraulic control through the construction of new groundwater desalter facilities at strategic points in the basin and the planned lowering of groundwater storage in certain parts of the basin. As part of the Hydraulic Control Monitoring Program (HCMP), WEI used four engineering and scientific showings to corroboratively demonstrate whether hydraulic control is occurring in the southern portion of Chino Basin. These engineering and scientific showings consist of water chemistry, hydrologic balance, piezometric levels, and groundwater modeling. After the initial two years of the HCMP, the data and analyses were used to site and design new groundwater desalter facilities to augment existing facilities in order to ensure complete containment. The HCMP is and will continue to be an ongoing study to ensure that hydraulic control is being achieved in the out years.
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