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y minimize flooding: The study- includes a_ 'computer:: backwater analysis of- large .trunk. storm sewers acting as pond outlets in order . to identify - excess or deficient capacity and surcharging problems. The TR-20 analysis includes both ditch and pipe routing, 100 .lakes, ponds and wetlands, numerous outlet structures and s-torm water pumping stations. f The final report, complete with recommendations, a five=year ICapitol Improvements Program and the TR-20 data will allow the City to input changing watershed conditions and monitor the water resources as development progresses. i Oakdale, Minnesota SEH is working with both the Valley Branch and the Ramsey- Washington Metro Watershed Districts to satisfy the 509 Surface Water Management requirements. In addition, we are using the TR- 20 program to analyze existing and' fully developed conditions of • the City to make recommendations for regional detention areas, storm water conveyance system improvements (ditch and trunk storm sewer) and to set 100 year flood elevations, peak discharge rates and required storage volumes. The report will -also address water quality and erosion and sedimentation control. Plymouth, Minnesota In conjunction with ;the two-mile reconstruction of Dunkirk Lane, a 1, 650 acre urban watershed was analyzed using TR-20 modeling for storm routing. A two mile long ditch .system, winding through numerous roadway culverts, detention basins and trunk storm sewer was analyzed using the HEC-2 program to predict the water surface profiles. The program results were used to design a. .new ditch alignment, cross section and a non-erosive channel lining. r Wausau, Wisconsin SEH provided the,- City with hydrologic analysis of rural and urban ` • watersheds totaling 15 square miles. Each watershed had the majority of its area outside the . city limits, and drained through