Landscaping at the Water s Edge: An Ecological Approach
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1 Landscaping at the Water s Edge: An Ecological Approach "Innovative Landscaping to Protect Water Quality: Reigning in runoff" Jeff Schloss Extension Professor and Water Resources Specialist UNH Cooperative Extension UNH Center for Freshwater Biology Lake Wicwas Association Annual Meeting August 6, 2011 Center Meredith, New Hampshire
2 NH Lakes Some of the cleanest and clearest lakes in the country However: Many lakes are showing signs of stress Cyanobacteria blooms are becoming more prevalent Nutrients (phosphorus and nitrogen) play a large role UNH studies suggest as TP and TN increase so do toxins
3 THE WATER CYCLE Snow Pack Evaporation Transpiration Evaporation & Transpiration Precipitation Runoff Snowmelt & Surface Runoff Infiltration Stream Flow Wetland Storage Ocean Ground Water Movement to Streams, Lakes, Wetlands & the Oceans
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5
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7 Development Impacts on the Water Cycle 10% 50% 55% 15%
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9 5x 7x 18x
10 Carving Up the Landscape Courtesy of UCONN Cooperative Extension
11 Buffer Width Affects Water Quality
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13 Importance of Layered Vegetation Transpiration Evaporation Infiltration through forest duff Forest duff and soils act as a sponge Roots stabilize soils preventing erosion and allow plants to pump up water back into the atmosphere (transpiration)
14 High shrubs/grasses will also discourage geese from coming on shore
15 Trees, tall plants and shrubs can discourage invasive species from spreading by shading
16 Let s Change the Approach! Landscaping does not have to be the problem
17 Let s Change the Approach! Landscaping can be the solution
18 Dealing With Home-Site Runoff Potential Contributing Waters Sources From Off-site Roads, Neighboring Properties From Your Site Driveways, Boat ramps, Foot paths, Compacted surfaces, Patios Roof Line, Gutters, Sump Pumps Seeps
19 Assessment & Inventory Site Drawing Wet areas Seeps/Springs Paved Areas Compacted Areas Point Sources Culvets Drains Sumps Paths/Trails Concentrated Flows Flat Areas Sloped Areas Following the Flow
20 Dealing With Home-Site Runoff Diversion -away from steep areas into vegetated areas Interruption- break up the flow so it can t build up velocity Spread the flow over a flat vegetated area Increase groundwater recharge through infiltration Protect shore area with riparian buffer
21 Infiltration (Drip) Trench Photos: AWWA
22 Rain barrels
23 Rain gardens Captures and soaks up storm water runoff Plants that tolerate temporary ponding
24 Photos: AWWA Rain gardens
25 Road, Driveway, or With a curb (curb cut needed) Parking Lot Scenario Photo Credit: Barr Engineering, Minneapolis, MN
26 Contributing Area From Road Photo Credit: Rusty Schmidt Drainage Area
27 Infiltration Steps
28 Waterbars Photo: AWWA Photo: AWWA
29 Waterbar Series Photo: AWWA
30 Plunge Pool/Dry Wells Photo: AWWA
31 Swales and Berms
32 Swales and Berms
33 Swales Can Promote Detention and Infiltration Check Dam Infiltration Trench
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35 Minimize Imperviousness, Use Vegetation Photo: AWWA
36 50 ft Forested Buffer 1, X 5x 2 X 7x <3 X 18x Infiltration Trenches Previous Example with Best Practices
37 Contact Information and Resources Jeffrey Schloss UNH Cooperative Extension 133 Spaulding Hall, 38 Academic Way Durham, NH (603) Publications: Extension.unh.edu/resources
38 Resources Links Landscaping at the Water s Edge: an ecological approach hard copy $20 Pdf version (free): NH DES- A Shoreland Homeowner s Guide to Stormwater Management nts/nhdes-wd-10-8.pdf For design guidance refer to Portland Water District/ Maine DEP environmental and conservation factsheet series:
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