Publications

Nearly 700 million gallons of ground water are withdrawn every day in Minnesota, mostly for public supply, irrigation, and domestic and commercial use. About 94 percent of the public water-supply systems in the State use ground water and 75 percent of all Minnesotans obtain their domestic supplies from ground water. The major issues related to this important resource in Minnesota are:

Abstract not submitted to date

In the control of larval sea lamprey (Petromyzon marinus ) with 3-trifluoromethyl-4-nitrophenol (TFM) in tributaries of the Great Lakes, occasional kills of other fishes have caused concern about the effects of the chemical on non-target organisms. Stream treatment rates have been based on previous application rates, alkalinity measurements, results of on-site toxicity tests, or...

No abstract available.

Abstract not submitted to date

Log-Pearson type III flood-frequency analyses were made of annual series peak-flow records from 246 gaging stations on unregulated streams in Minnesota having watersheds ranging in area from 0.08 to 2,520 square miles. These flood discharges were related to watershed and climatic characteristics by using multiple-regression techniques. On the basis of this preliminary regression analysis...

Water resources data for the 1987 water year for Michigan consists of records of stage, stage and contents of lakes and discharge, and water quality of streams; reservoirs; and water levels and water temperature of ground water. This report contains discharge records for 135 streamflow-gaging stations; stage only records for 15 lake-gaging stations; stage and contents for 5 lakes and...

An analytical procedure is described for determining residues of rotenone in fish muscle, fish offal, crayfish, freshwater mussels, and bottom sediments. Tissue samples were extracted with ethyl ether and extracts were cleaned up by gel permeation chromatography and silica gel chromatography. Sediment samples were extracted with methanol, acidified, partitioned into hexane, and cleaned...

The Apostle Islands National Lakeshore consists of 21 islands, part of the Bayfield Peninsula, and the adjacent waters of Lake Superior. Selected water resources of the Apostle Islands National Lakeshore were assessed to aid the National Park Service in developing and managing the Lakeshore and to provide a data base against which future changes can be compared. This summary of water...

Water levels, locations, depths, and aquifers tapped are given for 112 observation wells. Tabulated data include extremes of water levels for calendar year 1986 and for the period of record, pumpage of most major groundwater users in the State, and water-quality data from selected wells. The largest reported user of ground-water, the city of Lansing, pumped 7.6 billion gallons from the...

Crayfish have long been a nuisance in fishrearing ponds at fish hatcheries. The rusty crayfish (Orconectes rusticus) has displaced endemic species and caused serious declines of aquatic plants in some ponds and lakes in the midwestern USA. We attempted to evaluate the effect of intensive trapping on a crayfish population and to identify a selective chemical control agent and evaluate its

The success of vegetation management programs for waterfowl is dependent on knowing the physical and physiological requirements of target species. Lakes and riverine impoundments that contain an abundance of the American wildcelery (Vallisneria americana ) have traditionally been favored by canvasbacks (Aythya valisineria ) and other waterfowl as feeding areas during migration...