MICHELLE GERRITS EROSION & SEDIMENT CONTROL SPECIALIST WISDOT 608-264-8417 Dewatering Technical...
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Transcript of MICHELLE GERRITS EROSION & SEDIMENT CONTROL SPECIALIST WISDOT 608-264-8417 Dewatering Technical...
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MICHELLE GERRITSEROSION & SEDIMENT CONTROL SPECIALIST
WISDOT608-264-8417
Dewatering Technical Standard
http://dnr.wi.gov/runoff/stormwater/techstds.htm
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SANITARY AND STORM SEWER LOCATIONS
POTENTIAL CONTAMINATION
SOIL TEXTURE
DEPTH TO GROUND WATER
KARST FEATURES
DISCHARGE OUTFALL LOCATIONS
TOPOGRAPHY & GROUND COVER CONDITION
DISTANCE & CONVEYANCE TO RECEIVING WATERS
What do you need to know before dewatering?
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REUSE AS DUST CONTROL
ONSITE INFILTRATION
TRANSPORT TO SANITARY /TREATMENT FACILITY
GEOTEXTILE BAGS
GRAVITY BASED SETTLING SYSTEMS
PASSIVE FILTRATION SYSTEMS
PRESSURIZE FILTRATION SYSTEMS
POLYMER ADDITION
What are your dewatering options?
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Geotextile BagsType I & Type II
Sized by soil particle size, pumping rate & 50% clogging factor
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Gravity based settling >Portable Sediment Tank>Sediment Trap or Basin >Wet Detention Basin
Rely on gravity settling as primary method, require quiescent conditions
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Passive filtration >Manufactured Filters>Portable Filter Tank>Filter Basin>Vegetative Filter
Relies on filtration as primary method
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Pressurized filtration>Portable Sand Filter>Wound Cartridge Units>Membranes and Micro-filtration
Pressurized systems force water through a media designed to handle higher flow rates and typically have automatic backwash systems.
Most efficient at removing fine sediment.
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FLOW CHART
SOIL TEXTURE
DEWATERING MATRIX
How do you chose the right BMP for your situation?
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Need to know 3
Basic Soil Textures
Clayey - Fine to very fine particles >Snake
Silty - Medium to fine particles >Binds
Sandy - Coarse to medium particle >Falls apart
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USE A FLOATING SUCTION HOSE
PREVENT EROSION AT THE OUTFALL
INFILTRATE WHEN PRACTICAL
POLYMER USE INCREASES EFFICIENCY
REMOVE ACCUMULATED SEDIMENT
COMBINATION OF PRACTICES MAY BE NEEDED
Key issues to remember when dewatering
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