Salt Lake Valley Groundwater Management Plan State of Utah


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Salt Lake Valley Groundwater Management Plan

  • State of Utah

  • Department of Natural Resources

  • Division of Water Rights


Objectives

  • Give a Hydrogeologic overview of the water resources in Salt lake Valley

  • Familiarize the water user with work that the USGS has done since the Interim Management Plan was implemented.

  • Propose a management plan to replace the existing Interim Plan

  • Get comments from the water users



Hydrogeology of Salt Lake Valley



United States Geological Survey Studies

  • Chemical composition of groundwater, hydrologic properties of basin-fill material, and groundwater movement in Salt Lake Valley Utah

  • Numerical simulation of groundwater flow in basin-fill material in Salt Lake Valley, Utah

  • Particle-tracking analysis of time-related capture zones for selected public-supply wells in Salt Lake Valley, Utah

  • Numerical simulation of the movement of sulfate in groundwater in southwestern Salt Lake Valley, Utah



Salt Lake Valley



Analysis of the Aquifer System

  • The USGS models were run with no changes

  • The USGS models were run with modifications to simulate various pumping scenarios

  • The USGS model output was analyzed to determine aquifer response to various pumping scenarios



Valley Wide Problems

  • Areas of concentrated groundwater withdrawals

  • Movement of poorer quality water to areas of good quality water

  • Localized large drawdowns

  • Variations in water quality across the valley



Groundwater Issues East of the Jordan River

  • Quantity

    • gradient change
  • Quality

    • migration of poor quality water


Potential Withdrawal and Groundwater Flow



Groundwater Issues West of the Jordan River

  • Quantity

    • localized withdrawals
  • Quality

    • localized areas of poor quality water


Objectives of the Plan

  • Allow maximum utilization of the groundwater resource while:

    • protecting the aquifer
    • protecting existing water rights


Salt Lake Valley Groundwater Management Plan

  • Groundwater Withdrawal Limits

  • Change Applications

  • Proof of Appropriation/Change

  • Well Spacing and Flow rate

  • Applications to Appropriate Water and Segregation Applications

  • Extensions of Time for Applications to Appropriate Water

  • Metering and Annual Reporting of Groundwater Withdrawals

  • Monitoring Activities and Aquifer Status Update



Regional Groundwater Withdrawals from the Principal Aquifer

  • West region

    • Based on a 5 year moving average the maximum withdrawal is 70,000 acre-ft/year
    • Maximum withdrawal in any one year is 90,000 acre-ft


Sub-Regional Groundwater Withdrawals from the Principal Aquifer

  • An Area of dense withdrawals is located in Township 1S, Township 2S, and sections 1-18 of Township 3S.

  • Based on a 5 year moving average the maximum withdrawal is 85,000 acre-ft/year





Localized Groundwater Withdrawals from the Principal Aquifer

  • The management grid is based on the U.S. Public Land Survey’s system

  • One management square consists of four sections, in a 2 by 2 configuration



Localized Groundwater Withdrawals from the Principal Aquifer

  • West Region

    • Changes will not be allowed into a management square that currently has withdrawals of 2,000 acre-ft/year or more


Example of Potential Diversions



Groundwater Withdrawals from the Shallow Aquifer

  • Additional withdrawals will be allowed if:



Groundwater Withdrawals from Restricted Areas

  • There are 2 areas with restricted pumping because of contamination:

    • Vitro Tailings Site
    • Sharon Steel Site
  • Purpose of restriction is to prevent

    • change in vertical gradient
  • New restricted areas may be added



Applications to Change the Point of Diversion, Place of Use, or Purpose of Use

  • Change applications will be evaluated based upon their own merits

  • The evaluation may include:



Change Applications that will not be Approved

  • Changes from shallow to deep aquifer

  • Changes from west region to east region

  • Changes in the East Region that would put a management square over the limit

  • Changes into the East Sub-Region from any other part of the valley

  • Changes in the West Region that would put a management square over the limit

  • Changes determined to have a negative impact on the aquifer system



Change Application Limits



Proof of Appropriation / Change

  • Volume of water to be certified must be fully developed and placed to beneficial use

  • The State Engineer will review the operation of the system



Well Spacing and Flow Rate

  • A well will not cause more than 12 feet of drawdown on any well with an earlier priority date

  • Users may enter into an agreement to provide a variance from this requirement on the conditions that:

    • it does not interfere with third party rights
    • it has been approved by the State Engineer


Applications to Appropriate /Segregate Water

  • Applications will be considered for single family uses where no public supply system is currently available

  • Maximum diversion of these rights shall be 1.0 acre-foot per year

  • The rights will be approved as fixed time for a 10 year period

  • Users will connect to a system when it becomes available



Extensions of Time for Applications to Appropriate Water

  • Extensions will be critically reviewed

  • Unjustified delays or lack of due diligence may cause requests to be denied in full or may be granted:

    • with a reduction in diversion quantity
    • a reduced priority date
    • denied extension of time


Metering and Annual Reporting of Groundwater Withdrawals

  • Wells with a right to pump >50 acre-feet/year shall be equipped with a meter

  • Annual report of monthly diversions shall be submitted to the State Engineer by March 1 of each year

  • Wells with the right to pump >250 acre-feet/year shall be sampled and analyzed for total inorganics every 3 years



Monitoring Activities and Aquifer Status Update

  • The Division of Water Rights will:

    • monitor water quality data
    • provide a water quality update every 5 years
    • provide a withdrawal update report
    • provide current priority lists


Summary of Withdrawal Limits

  • West Region

    • Annual Limit = 70,000 acre-ft
    • Maximum one year Limit = 90,000 acre-ft
    • Management Square Limit = 2,000 acre-ft


Summary

  • Proposed plan is based on the most recent data and reports

  • Purpose of plan is to maximize utilization of the resource while minimizing possible negative impacts

  • This proposed plan will be modified according to comments from the water users





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