Page 31 - Beaumont Basin Watermaster - 2015 Annual Report

Section 3
Status of the Basin and Administration of the Judgment

At the end of 2014, an overall total of 96,575 ac-ft of water were stored in the Basin for future
use; this total was reduced in CY 2015 by 946 ac-ft to a cumulative total of 95,629 ac-ft. The
amount of water in storage has decreased over the last two years due to the expiration of the
Temporary Surplus allocation at the end of FY 2013. As of the end of CY 2015 the amount
of water in storage for each party with a storage account is as follows:

City of Banning 47,887.48 ac-ft
BCVWD 25,567.57 ac-ft

City of Beaumont 0.00 ac-ft
South Mesa Water Company 8,198.43 ac-ft

Yucaipa Valley Water District 13,976.43 ac-ft
Morongo Band of Mission Indians 0.00 ac-ft

TOTAL in storage 95,628.92 ac-ft

3.6 Changes in Groundwater Levels in the Beaumont
Basin

3.6.1 Analysis of Groundwater Level Changes
Changes in groundwater flow and groundwater levels between 2014 and 2015 were
evaluated using a calibrated groundwater flow model that was previously developed to
reevaluate the safe yield of the Beaumont Basin (TH&Co, 2015). For this analysis, the
existing calibrated model was updated with groundwater pumping, recharge, and
groundwater levels through the end of 2015. A model-generated groundwater contour map
was created for Fall 2015 and compared to the model-generated Fall 2014 groundwater
contour map in order to evaluate changes in groundwater flow patterns and basin-wide
changes in groundwater levels. The model-generated groundwater contour maps for 2014
and 2015 are shown on Figures 3-5 and 3-6, respectively.

Groundwater flow within the Beaumont Basin generally depends on location with respect to a
groundwater flow divide which occurs in the center of the basin approximately coincident with
the Noble Creek drainage. West of the Noble Creek drainage, groundwater generally flows
to the northwest and ultimately towards San Timoteo Wash. East of the Noble Creek
drainage, groundwater flows to the southeast towards the City of Banning. The groundwater
flow directions did not change significantly between 2014 and 2015.

Basin-wide groundwater level trends in the Beaumont Basin were evaluated based on
hydrographs from eights key wells and the groundwater level change map developed by
subtracting the 2014 groundwater surface from the 2015 groundwater surface. In the
northwest portion of the basin (YVWD 34 and Singleton Ranch 7), groundwater levels have
remained stable in YVWD 34, but have increased since November 2014 in Singleton Ranch
7. At Tukwet Canyon Golf Club C, groundwater levels have been steadily declining each

Beaumont Basin Watermaster 2015 Annual Report – Final – December 2016 3-10