08-09-1989 Council Agenda - Laserfiche WebLink

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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. ROSEVILLE, MINNESOTA In September of 1987, SEH was hired by the City of Roseville to study a Section of ditch tributary to McCarron Lake. The ditch had become badly eroded and an existing weir structure had washed out. The study analyzed the 1000 foot ditch section to determine the cause of the ditch instability. The analysis included recommendations for dissipation of energy, ditch stabilization of eroded areas. Upon completion of the study, plans and specifications were prepared and the construction was completed in 1988. Special features of the plan include a riprap preformed scour hole and a gabion drop structure. ROSEVILLE, MINNESOTA A comprehensive drainage plan was prepared by SEH nearly 25 years ago for the City. Based on this overall drainage plan, a city- wide storm water plan was initiated. Numerous projects totaling over 80 storm water detention basins and 60 miles of pipe within the community were designed by and constructed under the guidance of the SEH staff. STILLWATER, MINNESOTA The Stillwater East Industrial Park was the focus of a drainage study completed by SEH in February, 1987. TR 20 hydraulic modeling assisted in the preparation of recommendations for improvements to the 153 -acre area. SEH is now in the process of designing two drainage facilities. Because the drainage area is Page .1 1 - 13 -