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that relies not on a single number for the pumping will vary depending on the
sustainable yield, but rather on the measurable measureable objectives and minimum
objectives and minimum thresholds defined in thresholds adopted, the projects implemented,
the GSP. The 5-year updates will be used to and the management strategies employed.
reduce uncertainty throughout the 20-year Initial results of the future model scenarios will
implementation period. be used to inform subsequent model runs to
optimize the beneficial use of groundwater and
The Past Is Not the Key to the minimize impacts to the sustainability
Present (Or the Future) indicators. This process is likely to take several
iterations before the final minimum thresholds
Although a determination of the historical safe and measureable objectives are incorporated
yield is a required component of the GSP, this into the GSP.
determination will not be used to manage the Advisory Committees Require a
Basin moving forward. Rather, the Basin
management strategies will derive from the Clearly Defined Role
determination of the sustainable management
criteria and local definitions of significance and The GSA will establish a technical advisory
unreasonableness for each sustainability indicator. committee (TAC) to provide technical expertise
and insight to the development of the GSP. The
Defining the Sustainable GSA should retain the final authority to approve
Management Criteria is an decisions related to the GSP, and the role of the
TAC should be clearly defined as solely advisory.
Iterative Process In the absence of a clear delineation of
authority and mandate, the TAC can become a
Local determination of sustainability hinges on roadblock to completing the project.
understanding the impacts of the GSP on
beneficial uses and users of the Basin. These
impacts and the amount of sustainable
Develop Groundwater Sustainability Plan for the Yucaipa Basin Area Page 2
Yucaipa Sustainable Groundwater Management Agency - August 9, 2018 - Page 80 of 208
