Feb 27, 2004 · Groundwater generally converges toward the Santa Ana River in the southwestern part of the subbasin and discharges over the San Jacinto fault at Colton Narrows (USGS 1989).
USGS Fact Sheet 2012–3037: Groundwater Quality in the Upper Santa Ana …
The Santa Ana River, with its headwaters in the San Bernardino Mountains, is the longest river in Southern California and flows southwestward through the Upper Santa Ana Valley. Streamflow in the Santa Ana River varies seasonally; the highest flows are generally in the winter and spring.
Jan 20, 2006 · San Antonio Creek and Cucamonga Creek drain the surface of the subbasin southward to join Santa Ana River. Annual mean precipitation ranges from 13 to 29 inches across the surface of the subbasin and averages about 17 inches. The water-bearing units in the Chino Subbasin includes Holocene and Upper Pleistocene alluvium. Holocene Alluvium.
Upper Santa Ana Valley Groundwater Basin, San Timoteo Subbasin • Groundwater Basin Number: 8-2.08 • County: Riverside, San Bernardino • Surface Area: 73,100 acres (114 square miles) Basin Boundaries and Hydrology . The San Timoteo Subbasin underlies Cherry Valley and …
Upper Santa Ana Valley – Chino – Groundwater Exchange
Located in California’s South Coast hydrologic region, the Upper Santa Ana Valley – Chino is 153,762 acres in size. This Very Low priority basin is home to an estimated 910,806 people (2010 value). It has approximately 1551 wells, of which approximately 164 are water supply wells.
Basin Plan | Santa Ana Regional Water Quality Control Board
The Santa Ana Region covers parts of southwestern San Bernardino County, western Riverside County, and northwestern Orange County. The Basin Plan establishes water quality standards for the ground and surface waters of the region.
Upper Santa Ana Valley – Yucaipa – Groundwater Exchange
Located in California’s South Coast hydrologic region, the Upper Santa Ana Valley – Yucaipa subbasin is 22,219 acres. This High priority basin is home to an estimated 56,527 people (2010 value). It has approximately 246 wells, of which approximately 37 are water supply wells.
Feb 27, 2004 · • Groundwater Basin Number: 8-2.04 • County: Riverside, San Bernardino • Surface Area: 30,100 acres (47 square miles) Basin Boundaries and Hydrology . The Rialto-Colton Subbasin underlies a portion of the upper Santa Ana Valley in southwestern San Bernardino County and northwestern Riverside County.
Upper Santa Ana Valley – San Timoteo – Groundwater Exchange
Located in California’s South Coast hydrologic region, the Upper Santa Ana Valley – San Timoteo subbasin is 158,534.44 acres. This Very Low priority basin is home to an estimated 50,453 people (2010 value). It has approximately 390 wells, of which approximately 38 are water supply wells.
The Santa Ana River, with its headwaters in the San Bernardino Mountains, is the longest river in Southern California and flows south-westward through the Upper Santa Ana Valley. Streamflow in the Santa Ana River varies seasonally; the highest flows are generally in the winter and spring. In the dry season, most streamflow in the Santa