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State Water Board Drought Year Water Actions

SAN JOAQUIN RIVER UPSTREAM OF MERCED CONFLUENCE ANALYSIS

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July 2014 Update

For updated information, please refer to the Sacramento-San Joaquin Basin Analysis Webpage. No further updates will be made to this page at this time.

The following information on projected water supply, demand and availability, prepared by the Division of Water Rights for the Upper San Joaquin River, is being provided to assist water right holders in planning for water availability in the coming months. These are estimates only and subject to revision and update.

  • Current Watershed Conditions
    • Upper San Joaquin River Seasonal Graph  Adobe PDF logo

  • Curtailment Notices Issued
    • None, due to continuing, intermittent storm events.

  • Curtailment Projections

Notes

  1. This information is the Division of Water Right’s best projection for possible future curtailments of water rights due to drought conditions based on current hydrologic data.
  2. Curtailments can be lifted temporarily or permanently if water supply conditions improve.
  3. The projected water supply for the Upper San Joaquin River was developed using Department of Water Resources (DWR) projected water supply at both a 90% exceedance level and 50% exceedance level. The exceedance level is the likelihood, based on historical data, that the actual flow will exceed the projected amount. To determine which exceedance level best fits actual flow conditions, the Division is tracking the daily flows, in acre-feet per day, and comparing that to the monthly total amount projected by the Department divided by the number of days in the month to show acre-feet per day. The attached graph Adobe PDF logo shows this daily tracking.
  4. The curtailment notice does not affect water delivered by contract from state, federal or local agencies, unless the curtailment prevents an agency's ability to divert water under its water right.  Contracts using water withdrawn from reservoir storage that had been collected prior to the curtailment are not affected.

Upper San Joaquin River Boundary

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