University of Minnesota Duluth Stormwater Features on the UMD Campus

Transcription

1 University of Minnesota Duluth Stormwater Features on the UMD Campus Erik Larson - Senior Engineer University of Minnesota Duluth Facilities Management Northland Innovative Stormwater Management Conference November 17, 2010

2 Stormwater Tour of the UMD Campus Wet Ponds Filtration Ponds Modified Soils RG / Bio-retention Hydrodynamic MH Underground Tank Swale Pervious Surfaces Green Roof Alternative Plantings

3 UMD Campus Three Watersheds Two Trout Streams Total Area 10,520,000 Sq. Ft. Impervious Area 3,100,000 Sq. Ft. Treated Impervious Area 1,000,000 Sq. Ft.

4 Stormwater Tour of the UMD Campus Wet Ponds

5 Rock Pond / Eric Clarke / Fire Hall Ponds Wet Ponds Year round standing water. Constructed 1960 s Dredged 1980 s / 2002 Mid Depth Outlets 2004 / 2009 Pro Simple Minimum Maintenance Con PAH s Mosquitoes Invasive Species Beavers Thin Ice Water Temperature Increase

6 Swenson Science Research Pond Swenson Science Research Pond Roof and foundation drain water captured in shallow reflecting pond for wild rice research. Constructed 2005 Pro Research Aesthetic Con Algae Ducks Start Up / Shut Down of Pumping System

7 Stormwater Tour of the UMD Campus Filtration Ponds

8 Filtration Ponds Filtration Ponds Sand filtration medium with sand or grass surface Constructed Filter Reconstructed 2010 Pro Simple Design / Construction Potentially Multi Use Minimum Maintenance Con Invasive Species Potentially Unattractive

9 Stormwater Tour of the UMD Campus Swale

10 Swales Swales Rock or grass ditches often with rock check dam. Pro Simple Design / Construction Minimum Maintenance (with the exception of rock check dams) Con Low Volume Required for Treatment Potentially Unattractive Mowing problems Rock Check Dams are Maintenance Intensive

11 Field 5 Infiltration Swale Infiltration Swale Underground sand channel to slowly move water away from area. Pro Simple Design / Construction No Infrastructure Spring 2003 Con Damaged by Outside Contractor 2006 Swale Design Summer 2005

12 Stormwater Tour of the UMD Campus Modified Soils

13 Modified Soils Modified Soils Modifying soil surface by adding geo-grids, mesh, sand or rock to stabilize surface and prevent ponding or rutting. Uses Stabilizing Edges of Sidewalks Cow Paths Pro Reduced Impervious Surface Reduced erosion Con Difficult Construction Winter Grass Kill When Plowed Often Doesn t Hold Up to Loads

14 Rock Hill Road Rock Hill Road Gravel road surface replaced with Geoweb mesh, and crushed rock/topsoil mixture to stabilize surface and prevent rutting. Pro Reduced Impervious Surface Reduced erosion Con

15 Stormwater Tour of the UMD Campus RG / Bio-retention

16 Rain Garden / Bio-retention Ponds Rain Garden / Bio-retention Ponds Sand/soil/compost medium with planted surface Pro Aesthetic Outreach / Educational Con Difficult Construction Maintenance

17 Stormwater Tour of the UMD Campus Hydrodynamic MH

18 Hydrodynamic Hydrodynamic Devices Separate oils and solids from moving stormwater by gravity. Pro Pre-built Construction Minimum Maintenance Con Low Volume Required for Treatment Potential PAH Issues

19 Stormwater Tour of the UMD Campus Underground Tank

20 Underground Tanks Underground Tanks Temporary storage of stormwater for slow release back to the system. Pro Standard Pipe Construction Minimum Maintenance Con Leaks Hard to Inspect

21 Stormwater Tour of the UMD Campus Pervious Surfaces

22 Pervious Surfaces Pervious Surfaces Paver, concrete or asphalt that allows water to pass through it Pro Aesthetic Outreach / Educational Recycled Materials (some) Con Difficult Construction Maintenance Life Span (some)

23 Stormwater Tour of the UMD Campus Green Roof

24 Green Roofs Green Roof Roof surface covered with planting material. Pro Aesthetic Outreach / Educational Insulation Value Con Hard to Fix Leaks

25 Roof Top Vegetable Garden Roof Top Vegetable Garden Roof surface covered with raised bed vegetable garden. Pro Outreach / Educational Cooler Roof Deck Less Impervious Surface Con Maintenance

26 Stormwater Tour of the UMD Campus Alternative Plantings

27 Alternative Plantings Alternative Plantings Replacing troubled areas with an alternative to sod. Pro Aesthetic Con Annual Planting

28 University of Minnesota Duluth Stormwater Features on the UMD Campus Erik Larson - Senior Engineer University of Minnesota Duluth Facilities Management Northland Innovative Stormwater Management Conference November 17,