Mica Creek Experimental Watershed

 
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Water Flow

Abstract - Results

Streamflow data from water years 1991 through 2005 were used to assess variations in water yield due to afore mentioned treatments. Annual, seasonal, and monthly water yields were assessed. The change in hydrologic yield was assessed using linear regression and analysis of covariance (ANCOVA). Water yield increased in excess of 254 mm/yr (p < 0.01) following clearcut harvesting, and by more than 124 mm/yr (p < 0.01) following partial cut harvesting. Monthly and seasonal analyses revealed the largest impacts of harvest practices on hydrologic yield during the snow deposition and melt season from November through June. Dry season analyses (July through October) indicated negligible water yield increases following treatments. Evapotranspiration was reduced by 5% following road construction, and by 35% and 14% following clearcut and partial cut harvest, respectively.

Primary Contacts: Jason Hubbart (web page), Tim Link (web page)
 
Figure 1. Hydrographs reflecting water yield for 7 catchments before, and following road construction and harvest treatments within the confines of the Mica Creek Experimental Watershed located in northern Idaho. C1 = clearcut, C2 = partial cut, post roads monitoring = 1998-2001, post harvest monitoring = 2002-2005.
Figure 2. Double mass plots of water yield following road construction and harvest treatments in the Mica Creek Experimental Watershed, located in northern Idaho. Where C = catchment.
Figure 3. Regression relationships between Catchments at the MCEW prior to, and following road construction and timber harvest. Where C = Catchment, c = calibration, r = roads, t = treatments, and rm = reduced ANCOVA model.
 
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