SCD STORMWATER PROGRAM · State of Delaware Sediment and Stormwater Program Established by Law and...
Transcript of SCD STORMWATER PROGRAM · State of Delaware Sediment and Stormwater Program Established by Law and...
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SCD STORMWATER PROGRAM
PREPARE * PROTECT* PRESERVE*
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State of Delaware
Sediment and Stormwater Program
Established by Law and Regulation Statewide 1991.
❑ Requires all land disturbing activities over 5,000 square ft. to operate under an approved plan.
❑ Program is delegated to local municipalities, conservation districts, and DelDOT.
❑ Delaware Department of Natural Resources and Environmental Control (DNREC) responsible for program performance
statewide.
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In Delaware, you are never very far from water when land is developed. The potential for impacts to ecosystems and natural areas is significant.
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Sediment and Stormwater Delegation
❑ Sediment & Erosion
Control and Stormwater
Management Review
❑ Construction Inspection
❑ Maintenance Inspection
❑ Outreach & Education and
Technical Assistance
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Sediment and Stormwater Plan Review
Conceptual Design Meeting
Pre-application Meeting
Plan Review
Stormwater Management
Erosion & Sediment Control
Downstream Analysis
Pollution Prevention
As-Built Review
Technical Assistance
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Sediment and Stormwater Inspection
Pre-construction Meeting
Routine Site Inspection
Stormwater Maintenance Inspection
Including follow-up inspection
Meetings with contractors/HOA
Technical Assistance
Drainage Complaints
Outreach Education
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Sediment and Stormwater Maintenance
The District is required to
inspect all “closed out”
projects and generate an
inspection report
Approximately 2,000
closed out projects
The District is required to
follow-up on
maintenance reports and
inspect repairs.
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Types of Stormwater Management Facilities
◼ Wet Ponds◼ Dry Ponds◼ Infiltration Ponds◼ Underground Stormwater
Systems◼ Bioswales◼ Bioretention◼ Filter Strips◼ Constructed wetlands◼ Vegetated Roofs
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Wet Ponds Provide Quantity Management
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Wet Ponds: Things that you can do yourself
Routine Maintenance
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Mowing
◼ Mostly landscapers◼ 10’ access path to
pond◼ Mow around inlets
and outlets◼ Leaving buffer is
optional (not required but strongly encouraged)
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Leaving Buffers
◼ “No mow zone”◼ Work with landscaper◼ Must be group
decision◼ Width optional
◼ Benefits:◼ Controls geese◼ Uptakes nutrients◼ Less erosion◼ Better wildlife habitat
Buffer Strip
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Trimming – Maintenance of Vegetation
Remove small saplings ◼ Inlets◼ Outlets◼ Embankment
The longer you wait to remove the tree – the more expensive the cost for removal.
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Stabilizing Banks
◼ Buffers - Reduce erosion of side slopes
◼ Overseed/Stabilize as needed
◼ Major stabilization –hire a consultant◼ Erosion control matting◼ Choosing durable grass
species
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Remove Debris
◼ Remove trash◼ Remove debris from
inlets and outlet structures
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Fencing
◼ Optional◼ Not required◼ Not recommended
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◼ Removal of sediment (Forebay cleanout)
◼ Stabilization◼ Structural (riprap)◼ Vegetative
When to Hire a Professional
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When to Hire a Professional
◼ Mosquito Control (DNREC)◼ Kent & Sussex
422-1512
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When to Hire a Professional
◼ Removal of sediment (forebay cleanout)
◼ Mosquito Control◼ Major vegetation
removal◼ Algae◼ Non-native species?
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When to Hire a Professional
◼ Removal of sediment (Forebay cleanout)
◼ Mosquito Control◼ Major vegetation
removal◼ Cracked or broken
structural components
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Hire a Professional
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Hire a Professional
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Hire a Professional
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Hire a Professional
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Hire a Professional
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Hire a Professional
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I wish I had hired a Professional!
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◼ Ponds are designed to drain 48 hours after a rain event
◼ Maintenance Challenges◼ Invasive Plant Management◼ Soggy pond bottoms –
difficult to mow◼ If the pond is holding water
◼ Possible blockage◼ Downstream obstruction◼ Seasonal groundwater
Dry Ponds
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Infiltration Basin
◼ Ponds typically do not have a discharge outlet
◼ Rely on permeable soils for infiltration
◼ Low groundwater table
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Infiltration Basin Maintenance
◼ Crust forms over time◼ Scrape topsoil surface to
encourage/revitalize infiltration ◼ Failure due to poor drainage and
improper soils◼ Hire a professional◼ $$$
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Green Technology: Bioswale
•Provides Water Quality Treatment by removing sediment and nutrients
•Low Maintenance
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Bioswale Maintenance
◼ Provide routine maintenance
◼ Inspect for drainage obstructions/holding water
◼ Maintain grass height 6-8 inches –for increased water quality
No-Mowing in the swale flow line
Bioswale Enhancement with
native plants
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Rain Garden/Bioretention Cell
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Bioretention Maintenance
◼ Maintain as a landscape feature◼ Provide routine maintenance◼ Inspect for erosion and reseed as needed◼ Management of vegetation (No large trees)◼ Remove trash & debris◼ Add triple shredded hardwood mulch as needed
◼ If facility does not drain within 48 hours◼ Removal of accumulated sediment◼ Replace biosoil mix (every 15-20 years)◼ Must use DNREC certified soil media supplier
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Maintenance Inspection
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Maintenance Inspection Report
POND COMPONENTS
Embankment and Emergency spillway
1. Vegetation and ground cover
adequacy
2. Embankment erosion
3. Animal burrows
4. Unauthorized plantings
5. Cracking, bulging or sliding of dam
6. Slope protection or riprap failures
7. Emergency spillway clear of
obstructions and debris
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Maintenance Inspection Report
Riser and Principal Spillway
Low flow orifice obstructed
Weir trash rack maintenance
debris removal necessary
Excessive sediment accumulations inside riser
Pipe condition
Outfall channels functioning
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Maintenance Inspection Report
DRY PONDS
Adequacy of vegetation
Undesired vegetative growth
Woody vegetation
Low flow channels clear of
obstructions
Standing water or wet spots
Sediment and or trash accumulation
Erosion problems
Forebay – status of sediment
Pond functionality
Encroachments on pond
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Maintenance Inspection Report
INFILTRATION PONDS
Adequacy of vegetation
Undesired vegetative growth
Woody vegetation
Infiltrating between storms
Sediment and or trash
accumulation
Erosion problems
Forebay – status of sediment
Pond functionality
Encroachments on pond
Upstream areas stabilized
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Maintenance Before and After
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Maintenance Before & After
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Debris & Cleanout
Maintenance Inspection
Pond is overgrown with vegetation including invasive species and woody vegetation
Overgrown vegetation can obstruct drainage
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Maintenance Inspection
Occasionally, temporary sediment and erosion controls
get left on catch basins therefore restricting drainage
Grass clippings or lack of maintenance can restrict
drainage causing temporary flooding
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Maintenance Inspection
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Trash racks and
low flow orifices
are blocked by
debris and
overgrown
vegetation
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Erosion of Stormwater
Facilities
• Riprap outlet is designed to convey 100-year storms non-erosively. Events that exceed “design storms” have the potential to erode.
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Erosion of Stormwater Facilities
Change in upstream watershed Highly erodible soils Improper installation Significant rain event
EROSION
1. Can Compromise the storage capacity2. Added maintenance costs3. Creates instability around the outlet
structure4. Down stream impacts
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Sediment-Laden Runoff into
Stormwater Pond increases
future maintenance costs
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Successful Maintenance
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Homeowner Technical Resources
Sussex Conservation District Website:
Sussexconservation.org
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District Shop – Plants/Signage
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Jessica L. Watson
Program Manager
302-856-2105
Email:
Sussexconservation.org
PREPARE * PROTECT* PRESERVE*