Cooperator: Wisconsin
Department of Natural Resources
Project Chiefs: David J. Graczyk; Steven R. Corsi
Location: Statewide
Project Number: BQY32
Period of Project: October 2005–September 2007
updated 2/20/07
Problem
The distribution of daily constituent loading throughout the year is important
for design and evaluation of best-management practices. Is most of the annual
constituent load generated by snowmelt runoff during a few days in the spring
of the year or is most of the annual constituent load generated by intense thunderstorms
during the summer? How much does the distribution of daily constituent load vary
from year to year and from site to site? Does the portion of the annual constituent
load vary seasonally from year to year and from site to site?
Objective
The objectives of the study are to: (1) determine the cumulative distribution
of daily constituent loadings and examine the differences over time and between
sites and (2) determine the seasonal distribution of annual loads.
Approach
Daily constituent loads from the evaluation monitoring sites
will be used as the data set. Loads have been calculated at 8 rural evaluation
monitoring sites with 6-8 years of data at each site. The cumulative distribution
of daily constituent loadings will be determined for each site and for each year.
The portion of annual load attributed to seasons selected will be determined
and compared over time and between sites.
Progress (January 2006 to June 2006)
Data were compiled for the eight rural evaluation-monitoring sites. Cumulative
distribution of daily constituent loadings for each site and year was determined.
Plans (July 2006 to December 2006)
Analyses will continue and preparation of a report will begin.
Results will be published as a U.S. Geological Survey Open-File Report.
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