Yucaipa Subbasin Integrated Hydrologic Model
A numerical flow model is needed as a tool that integrates all hydrologic data and understanding developed from previous and ongoing work in the basin. For more information, click here.
Geologic structure of the Yucaipa area inferred from gravity data, San Bernardino and Riverside Counties, California
Open-File Report 2016-1127
Prepared in cooperation with the San Bernardino Valley Municipal Water District
- G.O. Mendez, V.E. Langenheim, Andrew Morita, and W.R. Danskin
- Document: Report (34 MB pdf)
- Additional Report Piece: Video animation (47.3 MB mp4) Land surface, geology, faults, wells, and elevation of the basement rocks in the Yucaipa area, California.
- Download citation as: RIS
The quality of surface water and ground water in the Yucaipa area was evaluated to determine general chemical characteristics and to identify areas of recent groundwater recharge. Water samples, collected from 8 sites on 3 creeks and from 25 wells, were analyzed for general chemistry, nutrients, tritium, and stable isotopes of hydrogen and oxygen. At one production well (1S/2W-25R4), water samples were collected at discrete depths during pumping and a continuous profile of the vertical flow rate inside the well casing was recorded. In addition to general-chemistry samples, tritium and carbon-14 samples were collected at this well to interpret the age of water at different depths.