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Runoff Pond Design,Lutsen, MN
By Mark Greve
Problem
Poplar River increases in sediment load near Lutsen ski hills
Structure needed to slow flow and settle sediment out
Find a location for structure that does not interfere with ski runs
Computer Modeling
Used LIDAR data in ArcGIS to determine watersheds, slopes, lengths, etc.
Also mapped roads, culverts and other points of interest
Flow paths, culverts and watershed boundaries field-validated
Computer Modeling (cont.)Water Erosion Prediction Project (WEPP)
model used to create slope model
Inputs: climate data (10 yr), slope, land cover and soil types
Outputs: total runoff,sediment load by particle size and areas of erosion
Computer Modeling (cont.)WEPP outputs transferred to Excel
Hydrograph created from flow-routing table
Pond Design
Two-pond system connected by ditch
Trapezoidal cross-sections, 2:1 ratio on sides
Riser pipe in centeras outlet
Emergency spillwayincluded
More Computer ModelingUsed flow equations for both pipe flow
and flow over a weir to determine daily discharge
Determined dimensions of pipe and ponds
Calculated sediment reduction
Questions?
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