Liberty Lake Watershed Analysis

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Presentation transcript:

Liberty Lake Watershed Analysis Brian E. Drake The University of Texas at Austin April 24, 2007 CE394K.2 - Hydrology

Outline Geologic Formation and Background Vegetative Zone of Influence HEC-HMS

Geologic Formation Creek dammed by ice sheet Lake Missoula flood deposits http://nwcreation.net/articles/missoulaflood.htm

Lake Missoula Present roughly 12,000 years ago Covered much of western Montana Volume = 530 mi3 Ice Dam = 2500 ft http://www.glaciallakemissoula.org/story.html http://www.pbs.org/wgbh/nova/megaflood/lake.html

http://www.uwsp.edu/geo/projects/geoweb/participants/dutch/VTrips/LkPendOr.HTM

The Floods Likely multiple floods Peak flow = 386 x 106 cfs Velocity = 30-50 mph http://www.uwsp.edu/geo/projects/geoweb/participants/dutch/VTrips/Scablands0.HTM http://pirlwww.lpl.arizona.edu/~turtle/photos/PTYS594A_Wash030.html

Liberty Lake Deposits

Lake and Watershed Characteristics Lake = 708 acres Watershed = 14 mi2 15 miles east of Spokane, WA

Outline Geologic Formation and Background Vegetative Zone of Influence HEC-HMS

Motivation Coupling hydrological/biological processes Example: Transpiration causing diel streamflow fluctuations Improve process interactions and water balance accuracy (Bond et al. 2002)

Data Collection Stilling well Hourly depth records Calibrated to flow

Vegetative Water Use

Width of Influence, W (ft) Zone of Influence Transpiration Rates 2.4 – 330 ft3/acre/hr Used 120 ft3/acre/hr for computations Month Width of Influence, W (ft) May 12 June 29 July 24 W

Outline Geologic Formation and Background Vegetative Zone of Influence HEC-HMS

Goals Gain exposure to HEC-HMS Define storm capable of causing lake property damage Adjudicated lake elevation = 2049.51 Flooding at 2054’

Results to Date 2 yr – 6 hr Storm Peak Flow = 24.4 cfs Volume = 4.9 acre-ft 100 yr – 24 hr Storm Peak Flow = 6376 cfs Volume = 871 acre-ft

Conclusions Past changes may give insight to future Diel streamflow fluctuations can be used to quantify vegetative zone of influence Very dependent on transpiration rates MODIS Leaf Area Index (LAI) HEC-HMS is a powerful tool for rainfall-runoff modeling Still need to determine storage-elevation relationship

Questions?