pic2.png
pic3.png
PDF Print E-mail
  

Columbia Basin GWMA
 Subsurface Geologic Mapping and Hydrogeologic Assessment Project Progress Report
 
Groundwater Geochemistry

Dimitri Vlassopoulos

SS Papadopulos and Associates
Portland, Oregon
Presented at GWMA Board Meeting, Othello, WA
January 22, 2009
  • Major ion chemistry
        • –Changes along flow path
        • –Relative age
        • –Recharge sources
        • –Mixing
  • Stable Isotopes
      • –Water sources (precipitation/runoff, surface water)
      • –Ancient (glacial) versus modern recharge
  • Atmospheric tracers (groundwater age-dating)
      • –Radiocarbon, tritium, CFCs, SF6
      • –Groundwater “age” (time since recharged)
      • –Mixing of old and young water (pumping effects)

GWMA Well Sampling 2008

GWMA Well Sampling 2008

 

Groundwater Geochemistry, Age and Recharge

Groundwater Geochemistry, Age and Recharge

 

Apparent Groundwater Age (Radiocarbon years)

Royal City

Wells #1, #2

  • Shallow-cased water supply wells completed in Wanapum
  • Static water levels steady
  • Mixture of older and “young” water (recharged  since 1950s)
  • Recharge from Frenchman Hills sufficient to sustain withdrawals

Royal City Well Sampling


Moses Lake

Well #18

  • Supply well completed in Wanapum (Frenchman Springs)
  • Static water levels stable
  • Mostly “young” water (post-1950’s)
  • Direct connection to East Low Canal  through Roza/Upper Frenchman Springs flow zones

 Moses Lake Well #18


Moses Lake 

Well #17

  • Supply well completed in upper Grande Ronde (Sentinel Bluffs)
  • Static water levels declining
  • Mixture of old and “young” water (average recharge age ~6,000 years)
  • Recharge from “young” water component (<20 %) is too small to offset withdrawals
  • Limited connection to surface recharge

 Moses Lake Well #17


Odessa

 

Irrigation well 20 miles east of Moses Lake
  • Well completed in Lower Grande Ronde (Umtanum and Ortley)
  • Static water levels declining
  • Old water (recharge age >10,000 years)
  • No present-day surface recharge sources

Odessa Well


Horseshoe Bend

 

Irrigation Wells
  • Shallow (132’) well in use since 1948 (Roza/Alluvium)
  • Deeper (605’) well in basalt (Wanapum and uppermost Grande Ronde)
  • Static water levels stable
  • Predominantly young water in shallow well, predominantly older water in deeper well
  • Relatively low groundwater use area
  • Connection to surface recharge (Sprague Lake) sufficient to recharge shallow well

 Well

 

However

 

This document is available as a PowerPoint Presentation, to view the presentation click here!     (This file is large and will load slowly for some viewers)

Last Updated ( Wednesday, 18 March 2009 )
 
Download GWMA Documents Here !
Home
Current Projects
Municipality Reports
Groundwater Modeling
Subsurface Mapping/Aquifer Assmt
Nitrate Programs
About Us
Client Mail Login
Contact Us:
Columbia Basin Ground
Water Management Area
170 N. Broadway
Othello, WA.  99344
509.488.3409
This e-mail address is being protected from spam bots, you need JavaScript enabled to view it                   

www.cbgwma.org