Scientific Investigations Report 2007–5041

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5041

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Table 2. Estimated ground-water budget for the Spokane Valley-Rathdrum Prairie aquifer for average conditions 1990–2005, Spokane County, Washington, and Bonner and Kootenai Counties, Idaho.

[Abbreviations: ft3/s, cubic foot per second]

Component Rate (ft3/s) Subcomponent or description Rate (ft3/s) Source
Inflow to aquifer
Spokane River 718 Spokane River near Coeur d’Alene Lake to Flora Road 606 Aug. 27–Sept. 1, 2005 streamflow measurements
      Spokane River below Greene Street at Spokane gage 112
Lakes 287 Hayden 62 L. Murray (University of Idaho, written commun., March 3, 2006)
      Pend Oreille 50 Frink (1964), Pluhowski and Thomas (1968), McQueen and Nace (1970), Drost and Seitz (1978), Painter (1991)
      Spirit 48 L. Murray (University of Idaho, written commun., March 3, 2006)
      Coeur d’Alene 37 Sagstad (1977)
      Twin 35 L. Murray (University of Idaho, written commun., March 3, 2006)
      Newman 20    
      Hauser 17    
      Fernan 13    
      Liberty 5    
Areal recharge 233 Total B.A. Contor (Idaho State University, written commun., April 20, 2006 and July 19, 2006); P.A. Hsieh (U.S. Geological Survey, written commun., December 6, 2006); Bartolino (2007)
Tributary recharge 112 Total Hortness (this volume)
Infiltration of ground water applied at land surface 77 Landscape irrigation 54 B.A. Contor (Idaho State University, written commun., January 15, 2007)
      Septic systems 23
Spirit Valley 44 Total L. Murray (University of Idaho, written commun., March 3, 2006)
Total inflow: 1,471            
Outflow from aquifer
Spokane River 861 Spokane River at Flora Road to below Greene Street 593 Aug. 27–Sept. 1, 2005 streamflow measurements
    Spokane River at Spokane gage to below Nine Mile Dam 268
Pumpage 318 Public supply 205 M.A. Maupin (U.S.Geological Survey, written commun., January 4, 2006),
      Self-supplied Industrial 34
      Irrigation (outside purveyor service areas) 51 B.A. Contor (Idaho State University, written commun., January 15, 2007)
      Domestic supply wells (outside purveyor service areas) 28
Little Spokane River 232 Little Spokane R. below “At Dartford” gaging station       Aug. 27–Sept. 1, 2005 streamflow measurements
Subsurface outflow 55 Flow to Long Lake       Drost and Seitz (1978)
Infiltration of ground water into sewers 2.3 Total       L. Brewer (City of Spokane, written commun., February 8, 2006)
Total outflow: 1,468                  
Totals
Total inflow: 1,471                  
Total outflow: 1,468                  
Difference: -2.7 0.2 percent            

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