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BOOK OF ABSTRACTS Tuesday, October 28 Concurrent Sessions V 1:15–2:45 Track E: Storm Water Monitoring, continued Stormwater Particle Size Distribution and Composition Greg DeGroot, University of Minnesota, degro048@umn.edu; and John Gulliver, University of Minnesota A sampling methodology has been developed to accurately sample stormwater particle characterization and size distribution. This methodology is currently being evaluated for its effectiveness, as well as its ability to be transferred to engineering and environmental practice. Emphasis is being placed on ensuring the methodology is scalable in scope and cost, allowing a method of particle sampling which fits specific users and their projects. 75 Minnesota Water Resources Conference, October 27–28, 2008
Concurrent Sessions VI 3:00–4:30 Track A: TMDL BOOK OF ABSTRACTS Wednesday, Tuesday, October 24 28 23 Water Quality Data for Lake Nutrient TMDLs: How Much is Enough Rebecca Kluckhohn, Wenck Associates, Inc., rkluckhohn@wenck.com; Merle Anderson, Clearwater River Watershed District; Diane Spector, Wenck Associates, Inc. Current approaches to setting lake nutrient TMDL’s involve expensive data collection modeling efforts. This paper compares implementation plans developed for lakes using large and small data sets and asks the question: How different is a $5,000 Implementation Plan from $50,000 plan Due to pressure from lakeshore residents concerned over rapidly declining water quality in Cedar Lake, we used an Implementation Strategy Ranking System (ISRS) in conjunction with a small but robust set of data and tools to draft an implementation plan for the lake. The ISRS was used to understand the relative costs and uncertainty associated with each implementation strategy. Additional data was collected to reduce the uncertainty and refine the implementation plan; however the differences between the draft and final plans resulted mostly from stakeholder input and logistical limitations, not from a reduction in uncertainties afforded by the additional data. Lessons learned have implications for all TMDLs in Minnesota. Integrating Geomorphologic Field Assessment and Watershed Modeling for Turbidity TMDL Greg Johnson, Minnesota Pollution Control Agency, gregory.johnson@state.mn.us; Troy Naperala, URS Corporation; Karen Evens, Minnesota Pollution Control Agency, Julianne Socha, USEPA The Poplar River turbidity TMDL was developed using total suspended sediment (TSS) as a numeric target. Sediment sources were quantified by analyzing water quality data, a physical channel assessment and computer modeling. Results of the data analysis indicated that: 68% to 85% of the TSS was originating in the lower Poplar River watershed; 73% of the turbidity exceedances occurred during high flow, and; 55% of the TSS reached the stream during April and May. The results of the physical channel assessment and WEPP computer modeling showed that: ■■ ■■ ■■ ■■ ■■ Near stream land slides contributed 428 to 1,024 tons/ year; Gullies and ravines contribute 50 to 400 tons/ year; Disturbed lands (ski runs, roads, trails) contributed 330 to 990 tons/ year; Forest land contributed 140 to 421 tons/ year and; Other sources (channel incision, golf courses, and developed areas) contributed 38 to 140 tons/ year. Minnesota Water Resources Conference, October 27–28, 2008 76
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Final Program and Book of Abstracts
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2008 Water Resources Planning Commi
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Program Schedule - Tuesday, October
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Program Schedule - Tuesday, October
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Developing Aquatic Life Benchmarks
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Minnesota Water Resources Conferenc
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