Combining LiDAR and stormwater infrastructure to delineate sub-neighborhood scale watersheds

Eric E. Castle, Assistant Professor, University of Minnesota Crookston

MECA Annual Conference, Nisswa, MN 3/8/2012

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Sediment Nutrients (nitrogen, phosphorous) Pathogens Pesticides Heavy metals Petroleum products Organic solvents Thermal

Image source: http://extension.oregonstate.edu/streaming/transcripts/after_the_rain/sect3.php

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As of 2002:

40% of U.S. streams, rivers, lakes and estuaries are not clean

enough for basic use.

Urban areas are responsible for 40% of non-point source pollution (leaving 60% due to

agricultural areas)

http://www.epa.gov/iwi

40/40 Rule

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Shallow planted depression that retains and infiltrates stormwater

Improve water quality Reduce flooding Provide habitat for wildlife and increase biodiversity Visually and psychologically attractive Are good for play!

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Dietz and Clausen (2006) paired watershed study: • only 0.8% overflowed • mixed results for N and P

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Clean water for future generations Dr. Svedarsky: “How can we do more…with less?” As budgets get tighter, how can communities

inventory stormwater infrastructure and assess community contributions to stormwater?

Progression of offline systems from a demonstration

and novelty, to one of targeted and prioritized approach

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1. Collect/create campus base map data

2. Delineate campus watersheds

3. Identify natural resources found on campus

4. Establish baseline water quality & quantity data

5. Identify, evaluate and prioritize areas that could impact campus stormwater.

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Light Detection And Ranging

http://www.wy.nrcs.usda.gov/wygis/lidar.html

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67B Bearden silt loam 2-6% slope

935 Hegne-Fargo complex

1280 Gunclub silty clay loam

1304A Glyndon very fine sandy loam 0-2% slopes

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Field test 6”* per hour infiltration, Hegne-

Fargo Complex 0.06 to 0.20 in/hr

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Light Detection And Ranging

http://www.wy.nrcs.usda.gov/wygis/lidar.html

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1. Field verify the catchments

2. Field verify LiDAR vegetation returns

3. More detailed soil surveys of potential BMP sites

4. Use technology to leverage knowledge