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Western States Water Council Ground Water in the West Conference Amarillo, TX December 3-5, 2003 Hugh Ricci, P.E. State Engineer PowerPoint PPT Presentation


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MANAGING GROUNDWATER. Western States Water Council Ground Water in the West Conference Amarillo, TX December 3-5, 2003 Hugh Ricci, P.E. State Engineer Nevada Division of Water Resources. STAFFING. ~80 people in 3 offices – main office in Carson City ~60 engineers/technicians

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Western States Water Council Ground Water in the West Conference Amarillo, TX December 3-5, 2003 Hugh Ricci, P.E. State Engineer

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MANAGING GROUNDWATER

Western States Water Council

Ground Water in the West ConferenceAmarillo, TXDecember 3-5, 2003

Hugh Ricci, P.E.

State Engineer

Nevada Division of Water Resources


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STAFFING

  • ~80 people in 3 offices – main office in Carson City

    • ~60 engineers/technicians

    • ~20 clerical/support staff

    • Seasonal help for water distribution

  • Hearing Section Chief is an attorney

  • 2 Deputy Attorneys General


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BEAN COUNTING

  • Receive ~100 applications per month

  • ~80% of the applications are changes of existing rights

  • Application No. 70000 was submitted in May 2003

  • An additional ~9400 vested and reserved claims


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WATER LAW IN NEVADA

Prior Appropriation Doctrine

  • First in time, first in right,

  • Beneficial use is the limit of the water right,

  • Use it or lose it

    vs.

    Riparian Doctrine


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S.E. CRITERIA FOR APPROVING AN APPLICATION

  • 4 criteria

    • Water available from proposed source

    • Does not conflict with existing rights

    • Cannot prove detrimental to the public interest

    • Protectible interest in domestic wells - 2001


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OTHER IMPORTANT CONCEPTS

  • Supplemental Rights – two or more rights used together for an intended use.

  • Comingled Rights – where more than one source, e.g. s.w. and g.w. or g.w. and effluent, are used together simultaneously for an intended use

  • Preferred Uses – Manner of uses designated as such by the State Engineer, e.g. Municipal, Commercial etc.


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DOMESTIC WATER WELLS

  • A water right application and permit are not required in order to drill a domestic well

    • Domestic purposes as defined under our statutes extends to culinary and household purposes, in a single family dwelling, the watering of a family garden, lawn and the watering of domestic animals

  • The maximum daily draught is limited to 1,800 gallons per day (2.02 acre-feet per year)


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232 Individual Groundwater Basins of which 119 are Designated or Partially Designated


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232 Groundwater Basins


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Perennial Yield

  • Can be defined as the maximum amount of ground water than can be salvaged each year over the long term without depleting the ground water reservoir


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Perennial Yield

  • Beginning in the early 1950’s, Water Resources and the USGS entered into a series of cooperative agreements whereby the USGS studied every basin and produced a reconnaissance report that estimated the perennial yield of that basin.


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Perennial Yield

  • Original analysis based on the Maxey-Eakin Method using precipitation-elevation data.

  • New method of analysis is called the ‘PRISM’ Method of determining precipitation. Greater perennial yields have been our experience with this method (2 to 3 times greater).


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GROUNDWATER

* 1.7 Million Acre – Feet

232 Groundwater Basins

EFFLUENT

GEOTHERMAL

* Perennial Yield of Valley-Fill Reservoirs


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How Did the Basins get Overdrafted?

  • Some were already over appropriated prior to the USGS data available (keep in mind that P.Y’s are as low as 200 acre-feet).

  • New data changed PY’s

  • Popular thinking that not all rights would be put to their maximum beneficial use.

  • In the case of Las Vegas Valley, purposely allowed to overdraft (revocable) with the hope that infrastructure would eventually be in-place to deliver Colorado River water and the over pumping would be curtailed.


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How Did the Basins get Overdrafted?

  • On paper, some basins are ‘over appropriated’ but that may be due to the issuance of supplemental groundwater to existing surface water sources. Only over drafting in drought years.

  • Additional allocation of the source may be allowed based on the estimated recharge to the basin from irrigation (~30%)


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Artesian Well - Well #3, Circa 1941


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EXAMPLES


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Carson Valley

  • PY is 45,000 AFA

  • GW permits total 100,000 AFA

  • 60,000 AF supplemental to SW (Carson River)

  • Actual pumpage in drought years is ~29,000 AF and ~20,000 in wet years.


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Las Vegas Valley

* PY of Las Vegas ValleyDOES NOTinclude secondary recharge from the 300,000 AF of Colorado River brought into the basin.


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Las Vegas Valley

  • Of the pumpage, ~6000 AF are revocable

  • ~5000 AF are from domestic wells

    Important to Note:

  • SNWA Cooperative Water Project (CWP)

    • Filed 146 applications in 1989 in 27 basins for the appropriation of 180,000 acre-feet of groundwater

    • Four permits have been granted

      • Virgin River – 130,000 afa

      • Garnet and Hidden Valleys – 2200 afa

      • California Wash – 2500 afa

    • Remaining 114 applications have over 3,000 protests


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Truckee Meadows(Reno/Sparks Area)

  • PY is 35,000 AFA

  • Permits issued slightly above PY

  • Sub-basin Problem

    • Mt. Rose Fan Area has ~ 18,000 AF appropriated in that one area.

    • Large concentration of domestic wells.

    • Only pumping ~4000 AF and experiencing severe declines in the water table.


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Mine Dewatering

  • Groundwater must be pumped in order to mine the ore body at great depths

    • Consumptive Use + Dewater was

      ~279,000 ac-ft in 2000


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Gold Mining

Nevada ranks 3rd in the world in gold production behind Australia and South Africa.

Nevada’s gold reserves are over 75% of the total known U.S. Gold resources.

April of 2002, Nevada Mining

celebrated the production

of the 50 millionth troy ounce

of gold produced from the

Carlin Trend.


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Management Tools


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Tools

  • Designate ground water basins

    • Preferred uses

    • Allows the State Engineer to impose additional conditions and restrictions on water use e.g. well depths, meters, sanitary seals

    • A water right permit is required to drill a well (other than domestic) in a designated basin.

  • Forfeiture and Abandonment

  • Grant changes of irrigation use for consumptive portion only.

  • Permit Terms and S.E.’s Orders requiring meters on diversions.

  • Substitutive uses in the case of mine dewatering.

  • Exchange of treated effluent for potable water


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Tools

  • T-Finite Term

  • Conjunctive Use through banking (TMWA)

  • Recharge

  • Have the ability to regulate pumping based on priorities

  • Monitor the Basins

    • Pumpage inventories

    • Groundwater level measurements

    • Public Input


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CARBONATE AQUIFER


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Nevada

Salt Lake

Utah

Las Vegas

Arizona


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Carbonate Pre-pumping


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Carbonate Post-pumping


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CARBONATE AQUIFER

  • Approximately 50,000 square miles in extent

  • The carbonate-rock sequences are believed to contain significant, but undetermined, quantities of ground water.

  • In 1984, the USGS proposed a 10-year investigation of the entire Carbonate Terrain.

  • It has been known since 1984 that to arrive at some reasonable understanding of the carbonate-rock aquifer system, substantial amounts of money would be required to develop the science, a significant period of study would be required, and that without some understanding development of ground water from the carbonate-rock aquifer system would be risky and the resultant effects could be detrimental to existing water rights and the environment.


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CARBONATE AQUIFER

  • In 1985, the Nevada Legislature authorized a program for the study and testing of the carbonate-rock aquifer system of eastern and southern Nevada. The program was a cooperative effort between the State of Nevada and the Federal Government. The overall plan for the program was to study the carbonate-rock aquifers of southern, east-central, and northeastern Nevada as separate phases of work, with a summary of findings to be prepared at the end of each phase. A summary report brought together results from more than 20 technical reports produced during the study.


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CARBONATE AQUIFER

  • Investigation of the carbonate-rock aquifer system is additionally complicated by factors including that:

  • Basic hydrologic data such as ground-water levels in the basin-fill aquifers and the carbonate-rock aquifers, reliable flow measurements for important springs and major streams are scarce or infrequently obtained in much of the area;

  • Secondary hydrologic and other data, such as hydraulic parameters, geophysical and geochemical, are lacking in many areas;

  • The geometry, properties, and boundaries of the carbonate-rock and basin-fill reservoirs are generally unknown, and definition of these properties can be expensive and difficult;

  • Climatic conditions today are inadequately defined (particularly at higher altitudes) and conditions during the development of the flow paths within the deep-rock aquifers and flow paths are even more uncertain;


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CARBONATE AQUIFER

  • Uncertainties and inaccuracies exist in current methods of estimating precipitation;

  • Uncertainties and inaccuracies exist in current methods of estimating ground-water inflow and recharge;

  • Uncertainties and inaccuracies exist in current methods of estimating ground-water outflow and evaporative discharge;

  • Only a small number of wells tap the deep carbonate-rock aquifer system;

  • Because there has been no significant historical pumping of ground water from the carbonate-rock aquifer system, ground-water models can only be used as a limited predictive tool for estimating the principle location and magnitude of the impacts of pumping ground water from the system;

  • Limited stresses on the water resources of the area under current development conditions allow hydrologists information only on the narrow band of system responses to natural conditions; and

  • The relationship between geothermal systems and the deep carbonate-rock aquifers and ground-water flow systems is not well understood.


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CARBONATE AQUIFER

  • S.E. issued Order 1169 on March 8, 2002

    • Stated that all applications pending and any new filings for water from the carbonate in the 6 basins in question, will be held in abeyance until further information is obtained by stressing the aquifer by those water right permits already issued from the carbonate.

    • Ordered a 5-year hydrologic study to be conducted during which at least 50% of the currently permitted water rights (~16,000 acre-feet) are pumped for at least 2 consecutive years. The cost of the study will be paid for by the 5 entities currently pumping from the carbonate aquifer.


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CARBONATE AQUIFER

  • S.E. issued Order 1169 on March 8, 2002

    • The S.E. will facilitate meetings between his office and the 5 entities concerning the scope of the study.

    • Requires each entity to exchange with each other on a quarterly basis, the rate at which water was diverted, total acre-feet diverted per month and monthly water levels measurements.

    • Within 180 days after the study period, a report must be filed with the S.E. as to the information obtained and any impacts seen to the groundwater or surface water resources of the carbonate or alluvial aquifers.

    • After the S.E. reviews the report, he will then make a determination as to whether he has sufficient information to proceed with ruling on the pending applications.


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Thank You,Questions?

http://water.nv.gov


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