runoff pond design, lutsen, mn by mark greve. problem poplar river increases in sediment load near...
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![Page 1: 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](https://reader036.vdocuments.us/reader036/viewer/2022080905/56649e805503460f94b8478e/html5/thumbnails/1.jpg)
Runoff Pond Design,Lutsen, MN
By Mark Greve
![Page 2: 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](https://reader036.vdocuments.us/reader036/viewer/2022080905/56649e805503460f94b8478e/html5/thumbnails/2.jpg)
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
![Page 3: 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](https://reader036.vdocuments.us/reader036/viewer/2022080905/56649e805503460f94b8478e/html5/thumbnails/3.jpg)
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
![Page 4: 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](https://reader036.vdocuments.us/reader036/viewer/2022080905/56649e805503460f94b8478e/html5/thumbnails/4.jpg)
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
![Page 5: 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](https://reader036.vdocuments.us/reader036/viewer/2022080905/56649e805503460f94b8478e/html5/thumbnails/5.jpg)
Computer Modeling (cont.)WEPP outputs transferred to Excel
Hydrograph created from flow-routing table
![Page 6: 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](https://reader036.vdocuments.us/reader036/viewer/2022080905/56649e805503460f94b8478e/html5/thumbnails/6.jpg)
Pond Design
Two-pond system connected by ditch
Trapezoidal cross-sections, 2:1 ratio on sides
Riser pipe in centeras outlet
Emergency spillwayincluded
![Page 7: 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](https://reader036.vdocuments.us/reader036/viewer/2022080905/56649e805503460f94b8478e/html5/thumbnails/7.jpg)
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
![Page 8: 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](https://reader036.vdocuments.us/reader036/viewer/2022080905/56649e805503460f94b8478e/html5/thumbnails/8.jpg)
Questions?