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Protecting Water Quality:
Best Management Practices
Sarah SmithUNH Cooperative ExtensionSarah.smith@unh.edu603‐862‐2647
Water
• Streams• Rivers
• Lakes• Ponds• Wetlands
BMPs• Simple, practical, cost‐effective steps• Designed to prevent or reduce non‐point source pollution
• Protect landowner’s investment
Why Bother?
Using fish as an example
BiologicalChemicalPhysical
When we think about BMPs we think in terms of:
•Goals•Costs•Planning•Construction•Maintenance
Recreational Access is also a NH Tradition
HikingCross Country Skiing
Snowmobiling
Mountain BikingUniversal Access
Equestrian
Dog SleddingATVs
BMPs for Timber Harvesting
• BMPs minimize the risk of sediment and other pollutants getting into waterbodies
• BMPs maintain the natural flow of water in streams and wetlands
• BMPs protect shoreland vegetation
Planning• Determine area and property boundaries• Identify critical areas• Identify where you want to place BMPs• Lay out BMPs on the ground• Choose BMPs that are appropriate• Decide on maintenance plan ahead of time
Construction
• Who is responsible• Legal requirements• Temporary or Permanent• Size and scale• Costs• Installation • Maintenance
Water Bar
Broad‐base Dip
Hay Bales
Silt Fence
Diversion Ditches
Culverts
Culverts
Open‐topped Box Culvert
GeoTextile
Bridge Construction
?
BMP Evaluation
• NH 2005 evaluation of BMP effectiveness demonstrated that BMPs are being used effectively, with soil stability:
• 77% of the time at crossings• 80% at approaches outside 50’ buffer• 76% at approaches inside the buffer• Installation and maintenance were the most common problems
APPROACH A-OUTSIDE THE BUFFER
APPROACH A-INSIDE THE
BUFFERSTREAM CHANNEL
APPROACH B-INSIDE THE BUFFER
CROSSING STRUCTURE
APPROACHB-OUTSIDE THE BUFFER
STREAM CHANNEL
Keep sediment out of streams!
Protecting Water Quality:
Best Management Practices
Sarah SmithUNH Cooperative ExtensionSarah.smith@unh.edu603‐862‐2647
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