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Streamflow and water-quality data for lake and wetland inflows and outflows in the Twin Cities metropolitan area, Minnesota, 1981-82

Open-File Report 83-543

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Abstract

A study of runoff to selected lakes was done in the Twin Cities, Minnesota, metropolitan area from July 1981 to December 1982. The purpose of the study was to determine differences in nutrient loading characteristics for lakes with and without wetlands and settling ponds. The study also quantified nutrient loading to lakes on a storm, seasonal, and annual basis, complementing an in-lake water quality study done by the Metropolitan Council. Discharge and water quality data were collected periodically during 1981 and continuously during 1982 at 22 sites located in seven lake watersheds--Bryant Lake, Lake Elmo, Fish Lake, Lake George, Lake Riley, Spring Lake, and Square Lake. Basin characteristics and land use were determined for each watershed. Recording instruments provided continuous discharge records at 13 sites and continuous rainfall records at six sites. Automatic water quality samplers were used at lake inlets, collecting samples at 1- to 2-hour intervals during storms. Lake outlet samples were collected manually on a weekly basis during flow. Samples were analyzed for suspended solids and nutrients. Atmospheric input data were collected at eight sites from September 23 to November 1, 1982. Discharge and water quality data were used to calculate storm, seasonal, and annual loads of total suspended solids, volatile suspended solids, total phosphorus, dissolved phosphorus, nitrite-plus-nitrate nitrogen, and ammonia-plus-organic nitrogen. All data collected during the study are documented in tables and graphs that contain: (1) watershed characteristics and land use; (2) storm concentrations; (3) storm, seasonal, and annual loads; (4) storm hydrographs; (5) atmospheric-input concentrations and loads; (6) storm, seasonal, and annual precipitation totals; and (7) results of quality-assurance tests. (Author 's abstract)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Streamflow and water-quality data for lake and wetland inflows and outflows in the Twin Cities metropolitan area, Minnesota, 1981-82
Series title:
Open-File Report
Series number:
83-543
Edition:
-
Year Published:
1983
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
ix, 192 p. :ill., maps ;28 cm.