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WWRC 88-01
Fiscal Year 1987 Program Report: WWRC


Six research projects were funded under the FY87 program, as well as an information transfer program. A short statement identifying each project follows:

A field lysimeter study near Laramie, Wyoming was conducted to measure phreatophyte transpiration utilizing porometry and a weighing lysimeter. Data collected indicated that seasonal evapotranspiration estimates were in close agreement between porometry and weighing lysimeter data.

Four techniques were evaluated for measuring intragravel water velocity (IWV) in five different compositions of salmonid substrate material. It was found that none of the four techniques could be recommended for field measurement of IWV in these substrate materials.

A Paleozoic Aquifer of the Casper Formation was identified as a potential untapped groundwater source in Laramie County, Wyoming. Recharge investigations were conducted along a possible recharge boundary of the aquifer to try and quantify the recharge amount. It was found that the study area is hydraulically severed by a thrust zone from the rest of the aquifer, but a possible area of recharge was identified north of the study area.

The impact of sedimentation and resulting spring flushing flows on the sediment were evaluated as to their effects on aquatic macroinvertebrates of a high mountain stream. The results indicated that a significant sediment impact on a high mountain stream did not adversely affect the aquatic microinvertebrate population for any significant time period.

Factors influencing upland sediment and runoff production were studied on a north-central Wyoming watershed which produces approximately 75 percent of the suspended sediment load to the Bighorn River. The factors found to be most important were slope gradient, vegetation-density and soil texture.

A multiobjective decision-making approach was utilized to develop a waste load allocation management model for a stream. The use of multiobjective analysis revealed that useful information can be gained for effective water quality management decision making.

Information transfer was accomplished through field tours, professional papers, a newsletter, law journal publications, seminars and updating data and bibliographic information sources for the State of Wyoming on regional and state water issues.

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