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BEAUMONT BASIN WATERMASTER
MEMORANDUM NO. 17-09
Date: February 1, 2017
From: Thomas Harder, Thomas Harder and Company
Subject: Presentation of Methodology for Estimating Groundwater Storage
Losses Associated with Supplemental Water Recharge
Recommendation: That the Watermaster Committee provides direction and feedback
to the ALDA/TH&Co team based on the presentation and
discussion.
One of the findings from the 2013 Reevaluation of the Beaumont Basin Safe Yield was
that there are groundwater underflow losses out of the basin and that the amount of loss
is sensitive to pumping and recharge from both within and outside the Beaumont Basin.
Furthermore, as the San Gorgonio Pass area is a groundwater flow divide, underflow
losses appear to occur in multiple locations along the southern portion of the basin. The
calibrated groundwater flow model developed for the Safe Yield reevaluation was used
to estimate the amount and location of losses in the basin, based on existing data.
The 2015 Beaumont Basin Watermaster annual report recommended that the
Watermaster Committee consider developing a methodology to account for groundwater
storage losses from the Beaumont Basin.
The purpose of this agenda item is to review a presentation of our current understanding
of groundwater losses out of the basin, the impacts of supplemental water recharge on
losses, and considerations for developing a methodology to account for losses associated
with storage of water in the basin.
