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Appendix C
Production Estimation for Un-metered Overlying Producers
Production Estimation for Un-metered
Overlying Producers
Introduction
The Water Duty Method is a method used to estimate groundwater production for individual
Overlying Users whose wells do not have water meters. The method was initially developed by
Wildermuth Environmental Inc. (WEI) during the preparation of the 2005-06 Annual Report for the
Watermaster. This method was later updated by WEI and it has been used since.
This appendix presents a list of un-metered Overlying Users, a summary of the Water Duty Method,
and updated production estimates.
Unmetered Overlying Users
The Water Duty Method was applied to the following un-metered Overlying Users:
Merlin Properties
Roman Catholic Bishop of San Bernardino County
Leonard M. and Dorothy D. Stearns
Sunny-Cal Egg and Poultry Company
Albor Properties III, LP
Nick Nikodinov
Ronald L. McAmis
Nicolas and Amalia Aldama
Hector Gutierrez, Luis Gutierrez, and Sebastian Monroy
Boris and Miriam Darmont
Water Duty Method
The following is a summary of the main elements of the water duty method.
The method is used to estimate groundwater pumping for indoor, outdoor, and
agricultural use.
Indoor water use is estimated based on the number of dwelling units on each producer’s
property. From historical water sales records in the BCVWD’s service area, indoor water
used was estimated 0.35 ac-ft/yr per dwelling unit. This consumption rate was applied to
each Overlying User based on the number of dwelling units in their property.
Outdoor water uses the Crop Water Requirement approach to estimate, based on the
acreage of irrigated landscape, the volume of water pumped on each producer’s
property. This approach uses evapotranspiration records from the CIMIS Station 44,
located at the University of California, Riverside, and crop type to determine the amount
Beaumont Basin Watermaster 2015 Annual Report – FINAL – December 2016 C-1
