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Ojai Basin Modeling Update and Drought Analysis
Ventura River Watershed CouncilJune 5, 2014
Gregory Schnaar, Ph.D.Stephen J. Cullen, P.G., Ph.D.
Daniel B. Stephens & Associates, Inc.
[email protected]@dbstephens.com
(805) 683‐2409Santa Barbara, CA
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Mission
It is the mission of the Ojai Basin Groundwater Management Agency to preserve the quantity and quality of groundwater in the Ojai Basin in order to protect and maintain the long‐term water supply for the common benefit of the water users in the Basin.
Activities
• Groundwater Management Planning• Documents groundwater extraction from reported pumping• Collects extraction charges from well owners• Coordinates with the County and private entities to monitor Basin conditions• Supports the San Antonio Spreading Grounds Rehabilitation Project (SACSGRP)• Maintains a groundwater model of the Basin• Monitors water levels in the Basin• Performs outreach and education activities • Participates in watershed, County, and State‐wide meetings• Assists individual stakeholders and landowners
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Current Drought Conditions Unprecedented
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Ojai Groundwater Model Updated through December 2013
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Distributed Parameter Watershed Model (DPWM) estimatesgroundwater recharge from precipitation and irrigation
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Recharge Primarily from Precipitation, Focused in Stream Channels
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Recharge ≤ 1,000 ac‐ft/yr when rain is less than 10 inches
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Groundwater model estimates groundwater levels and groundwater balance
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Updated Groundwater Model Calibration ‐Mean Error 21 ft
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Groundwater Balance:
Change in Groundwater Storage = Groundwater Inputs ‐ Groundwater Outputs
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1970 ‐ 2013: Net loss of 111 ac‐ft/yr groundwater in storage
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2009 ‐ 2013: Net loss of 2,532 ac‐ft/yr groundwater in storage
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Groundwater Levels Projected to Remain Relatively Low Even if 2015 is a “Wet” Year (~40 inches precipitation)
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Project
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Questions?