River discharge for sampling dates
Sampling dates for 1998 E. coli monitoring in the Mad River watershed are plotted over the daily hydrograph for the Mad River gaging station. Peak, intermediate, and low flow sampling dates were defined from flow duration curves, which are based on an historical record of mean daily discharge for the Mad River, acquired from USGS. Peak flows were defined as flows that are greater than or equal to the discharge at 20% flow exceedence. Intermediate flows were defined as flows that are between 20% exceedence and 50% exceedence , and low flows were defined as flows that are less than or equal to the discharge at 50% exceedence. (The exceedence value of 50% was chosen since the sampling period was a wetter than normal season and only a couple of dates fell under an 80% exceedence.) Peak flow also corresponded to storm events; intermediate and low flows occurred during dry weather. Five sampling dates occurred at peak flows, 12 at intermediate flows, and 10 at low flows.
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| Data and analysis by Deb Sargent under the direction of Dr. Leslie Morrissey, School of Natural Resources, University of Vermont. Cooperator: Friends of the Mad River. Streamflow data: USGS, Mad River gaging station. |
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