ground water effects of toppenish creek restoration tom elliott yakama nation wildlife
TRANSCRIPT
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Ground Water Effects of Toppenish Creek Restoration
• Tom Elliott
Tom Elliott
Yakama Nation Wildlife
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Project Area-Toppenish Creek on Yakama Reservation
Toppenish Creek 1909
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Historical Context
Drastic land use changes over last 200 years-
• Beaver trapping• Cattle and sheep grazing• Railroad and road
development• Irrigated Agriculture
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Floodplain Disconnection
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LiDAR Elevation Model
2005 channel
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Floodplain Restoration Using Grade Control
Goals:•Reconnect previously active channels and floodplain•Spread flood waters•Raise water table for riparian habitat improvement
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Monitoring Network
Stream gage
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Study Approach
Did the project raise the floodplain water table relative to creek flows?
• Collect and reduce data• Characterize groundwater interactions• Select wells that show creek influence• Compare water levels before and after project
completion for selected wells• Project was completed in fall of 2006
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Water table March 23 2009
Kriged using ArcMap Geostatistical Analyst
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Toppenish Creek vs. Marion Drain
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Well Data
need to reduce!
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Creek Influence on Wells
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Stream Stage Data
project completed
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Graphical analysis
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Water levels before and after
average difference = 0.26 ft
average difference = 1.81 ft
average difference = 0.82 ftaverage difference = -0.17 ft
1.81 ft – 0.26 ft = 1.5 ft
Toppenish Creek at Unit 2Average water levels in
selected wells
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Data Summary
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Channel effects?
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September 2005
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July 2008
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Conclusions
• Grade control structures appear to have raised water table relative to upstream flow by at least 1 foot at low flow
• Project effects vary by well location
• The biological significance is likely to be positive
• Better data collection is necessary for future monitoring efforts
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Questions?
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Works cited
• Reichmuth, D.R., Potter, A.S., and Reichmuth, M.G., 2007, Toppenish Basin Geomorphology, Geomax, P.C.
• Zar, J.H., 1999, Biostatistical Analysis, Fourth Edition: Upper Saddle River, New Jersey, Prentice-Hall, Inc., 798 p.