Minnesota Water Resources Conference - Water Resources Center ...
Minnesota Water Resources Conference - Water Resources Center ... Minnesota Water Resources Conference - Water Resources Center ...
BOOK OF ABSTRACTS Tuesday, Monday, October 27 23 Concurrent Sessions I 10:00–11:30 Track B: Managing Water Quantity and Quality in the Minnesota River Basin Rush River Hydrologic Study and Watershed Assessment Project Bob Barth, Bonestroo, bob.barth@bonestroo.com; Emily Resseger, Bonestroo Recently, there has been heightened interest in the hydrologic and water quality impacts of intensive agricultural land use in the Minnesota River basin. Increased agricultural production is made possible by draining wetlands and historic lakes. However, these drainage systems contribute to degraded water quality and increased bank erosion in the Minnesota River and its tributaries. Specifically, increased hydrologic variability leads to more flooding, causing bridge washouts, sedimentation, changes in stream alignment, and greater nutrient transport. As part of a larger Clean Water Partnership project, a hydrologic study of the approximately 400 square mile Rush River watershed focused on surface and tile drainage processes to identify opportunities for volume reduction. A detailed hydrologic and hydraulic XP-SWMM model of the Rush River watershed was calibrated to monitored flow rates collected near the mouth of each of the Rush River’s four main tributaries and in the River itself prior to joining the Minnesota River. The model identified and assessed potential storage areas and their ability to reduce flow in the Rush River. One of the most compelling findings of this study was how subsurface tile drainage affected the timing and magnitude of outflow hydrographs. By characterizing the surface hydrograph separate from the hydrograph of subsurface tile drainage, the total basin hydrograph closely matched the monitored flows. The study concluded that a comprehensive program to restore key lakes and wetlands throughout the watershed is required in order to provide adequate storage and reduce peak flows to more sustainable levels. Evaluating Different Strategies for Reducing Nonpoint Source Pollution in Seven Mile Creek Watershed Brent Dalzell, University of Minnesota, bdalzell@umn.edu; David Mulla, University of Minnesota Water quality models are routinely applied to assess the feasibility of alternative management practices or land use scenarios for the purpose of achieving improvements for stream water quality. One shortcoming of this approach is that alternative scenarios are often applied to the watershed in a uniform manner and the relative sensitivity of different portions of the landscape is not taken into consideration. In this study, we evaluate different land cover and land management scenarios in Seven Mile Creek watershed, a predominatelyagricultural watershed located in the Minnesota River Basin. A suite of alternative management scenarios was developed based on historic land cover data (e.g., location of pre-settlement wetlands) as well as topographic characteristics. Further, we assess how decisions about identifying sensitive landscape components are influenced by input data by comparing results obtained from digital elevation models of varying resolution. The performance (and shortcomings) of different approaches for designing alternative management scenarios will be presented. 19 Minnesota Water Resources Conference, October 27–28, 2008
Concurrent Sessions I 10:00–11:30 BOOK OF ABSTRACTS Tuesday, Monday, October 27 23 Track B: Managing Water Quantity and Quality in the Minnesota River Basin, continued Effects of Restored Perennial Vegetation- Wetlands Complexes on Stormflow, Sediment, and Nutrient Loading from Small Watersheds in Southern Minnesota Greg Fransen, University of Minnesota, frans025@umn.edu; Kenneth Brooks, University of Minnesota; Christian Lenhart, Kestrel Design Group, Inc.; Joe Magner, Minnesota Pollution Control Agency This paper discusses the hydrologic and water quality changes over four years following restoration of two wetlands with accompanying plantings of perennial vegetation in Martin County, south central Minnesota. These wetlands are situated in small catchments that consist of native perennial grasses and trees surrounding the wetlands. These perennial vegetation-wetland complexes intercept tile drainage and surface runoff from corn-soybean fields before emptying into the Blue Earth River tributary, Elm Creek. Tile flow and gully flow into wetlands, and outflow from wetlands, have been measured along with total phosphorus (P), soluble P, nitrate-N, and total suspended solids (TSS). The perennial vegetation-wetland complexes have reduced stormflow peaks and nitrate-N loading to Elm Creek. The effects on loading of soluble P, total P, and TSS are more variable, and are attributed in part to characteristics of the restored wetlands which were formally croplands. Management implications are discussed in the context of Total Maximum Daily Loads (TMDLs). Minnesota Water Resources Conference, October 27–28, 20078 20
- Page 1 and 2: Final Program and Book of Abstracts
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Concurrent Sessions I 10:00–11:30<br />
BOOK OF ABSTRACTS<br />
Tuesday, Monday, October 27 23<br />
Track B: Managing <strong>Water</strong> Quantity and Quality in the <strong>Minnesota</strong> River Basin, continued<br />
Effects of Restored Perennial Vegetation- Wetlands Complexes on Stormflow, Sediment, and Nutrient<br />
Loading from Small <strong>Water</strong>sheds in Southern <strong>Minnesota</strong><br />
Greg Fransen, University of <strong>Minnesota</strong>, frans025@umn.edu; Kenneth Brooks, University of <strong>Minnesota</strong>; Christian Lenhart,<br />
Kestrel Design Group, Inc.; Joe Magner, <strong>Minnesota</strong> Pollution Control Agency<br />
This paper discusses the hydrologic and water quality changes over four years following restoration of two<br />
wetlands with accompanying plantings of perennial vegetation in Martin County, south central <strong>Minnesota</strong>.<br />
These wetlands are situated in small catchments that consist of native perennial grasses and trees surrounding<br />
the wetlands. These perennial vegetation-wetland complexes intercept tile drainage and surface runoff from<br />
corn-soybean fields before emptying into the Blue Earth River tributary, Elm Creek. Tile flow and gully flow into<br />
wetlands, and outflow from wetlands, have been measured along with total phosphorus (P), soluble P, nitrate-N,<br />
and total suspended solids (TSS). The perennial vegetation-wetland complexes have reduced stormflow peaks<br />
and nitrate-N loading to Elm Creek. The effects on loading of soluble P, total P, and TSS are more variable, and<br />
are attributed in part to characteristics of the restored wetlands which were formally croplands. Management<br />
implications are discussed in the context of Total Maximum Daily Loads (TMDLs).<br />
<strong>Minnesota</strong> <strong>Water</strong> <strong>Resources</strong> <strong>Conference</strong>, October 27–28, 20078 20
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