stormwater bmp maintenance · 2017. 7. 25. · bmp water quality credits neuse and tar river basins...
TRANSCRIPT
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Stormwater BMP Maintenance & Inspection
Stormwater BMP Maintenance
Background and Definitions
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Stormwater BMP Maintenance & Inspection
What is Stormwater Runoff?
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Stormwater BMP Maintenance & Inspection
Stormwater
• Stormwater is the result of precipitation that flows overland to streams and other bodies of water
• Stormwater collects pollutants as the water flows overland
• Stormwater is typically not treated• The amount of runoff is increased by hard,
impervious, or compacted surfaces
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Stormwater BMP Maintenance & Inspection
Convincing Property Owners to “Buy Into” Stormwater
Inspection & Maintenance
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Stormwater BMP Maintenance & Inspection
Do you like to…Swim
Fish
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Stormwater BMP Maintenance & Inspection
Had you rather swim in
This
Or This
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Stormwater BMP Maintenance & Inspection
Had you rather fish in…This
Or This
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Stormwater BMP Maintenance & Inspection
Is water related recreation important to North Carolina?
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Stormwater BMP Maintenance & Inspection
Is there a connotation to clean water in our culture?
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Stormwater BMP Maintenance & Inspection
Tourism and Water ???
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Stormwater BMP Maintenance & Inspection
Where does your drinking water come from?
Does it come from here?
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Stormwater BMP Maintenance & Inspection
Is Flooding a Serious Issue in North Carolina?
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Stormwater BMP Maintenance & Inspection
Is erosion a serious issue in North Carolina?
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Stormwater BMP Maintenance & Inspection
What’s the difference?
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Stormwater BMP Maintenance & Inspection
The difference is…Storm sewers lead to…
Streams
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Stormwater BMP Maintenance & Inspection
The difference is…Sanitary sewers lead to…
Waste water treatment plants
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Stormwater BMP Maintenance & Inspection
Watersheds and Land Use• Watershed is that
geographic area that drains into a stream or river
• Watershed = catchment = drainage area
• Urbanization of watersheds increases stormwater flows
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Stormwater BMP Maintenance & Inspection
Managing Stormwater
• Stormwater is directly related to land use– ‘generally, the more the land is used
(developed) the more stormwater will be generated’
• Best Management Practices (BMPs) are installed to treat, slow, and reduce stormwater runoff
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Stormwater BMP Maintenance & Inspection
Stormwater Management vs. ‘Drainage’
• Agriculture and Engineering have emphasized drainage for centuries – get the water off-site ASAP
• Stormwater management is fundamentally different… from previous slide:
• “Best Management Practices (BMPs) are installed to treat, slow, and reducestormwater runoff”
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Stormwater BMP Maintenance & Inspection
Best Management Practice/ SCM
• Structural, vegetative, or management practices used to protect and improve our surface and groundwater
• The new term for this is “Stormwater Control Measures” (or SCMs)
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Stormwater BMP Maintenance & Inspection
Stormwater Control Measures
• Also known as ‘BMPs’• SCMs are expensive to design and install
so they should be maintained to:• 1. LOOK GOOD• 2. FUNCTION PROPERLY• 3. BE SAFE
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Stormwater BMP Maintenance & Inspection
Please be aware….
• All BMPs need maintenance• We will show many examples of BMPs
that need maintenance• BMPs that are well maintained should
have a life span of 30+ years• We are learning as we go, designs have
improved, construction has improved, maintenance has improved….
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Stormwater BMP Maintenance & Inspection
Why Are We Here?Cary Stormwater BMPs 2008
• Approximately 425 BMPs in Cary • According to one of Cary’s inspectors:
Timothy Grady, RLA:• 95% of BMPs fail initial inspection as they
require repairs• Most repairs are maintenance related:
erosion, trash removal, tree removal
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Stormwater BMP Maintenance & Inspection
Why Are We Here?Cary Stormwater BMPs 2010
• Approximately 600 BMPs in Cary • Cary has digital tracking system for BMPs• Strong educational program for
contractors, has 2 inspectors• Must pass initial inspection to get C/O• ~ 95% pass first annual inspection now
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Stormwater BMP Maintenance & Inspection
BMP Water Quality CreditsNeuse and Tar River Basins
N P• Wet pond 25 40• Wetland 40 40• Bioretention 40 45• Grass Swale 20 20• Veg Strip w/LS 20 35• 50’ rip buff w/LS 30 30• Permeable Pavements 40-60* 40-60*
* Coastal Plain & Sandhills Only
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Stormwater BMP Maintenance & Inspection
Wet Detention Basins
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Stormwater BMP Maintenance & Inspection
Stormwater Wetlands
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Stormwater BMP Maintenance & Inspection
Bioretention or Rain Garden
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Stormwater BMP Maintenance & Inspection
Dry Detention Basins
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Stormwater BMP Maintenance & Inspection
Riparian Buffers
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Stormwater BMP Maintenance & Inspection
Level Spreaders
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Stormwater BMP Maintenance & Inspection
LS + Engineered Filter Strips
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Stormwater BMP Maintenance & Inspection
Grassed Swales
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Stormwater BMP Maintenance & Inspection
Green Roofs
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Stormwater BMP Maintenance & Inspection
Infiltration Devices
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Stormwater BMP Maintenance & Inspection
Cisterns/ Water Harvesting
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Stormwater BMP Maintenance & Inspection
Permeable Pavement
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Stormwater BMP Maintenance & Inspection
Sand Filter
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Stormwater BMP Maintenance & Inspection
Manufactured BMP Systems
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Stormwater BMP Maintenance & Inspection
Pollutants
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Stormwater BMP Maintenance & Inspection
Pollutants• Nitrogen
– From atmosphere (car exhaust, etc.)
– From fertilizer– Water soluble– Feeds algal blooms– Contaminates shallow
groundwater
• Phosphorus– Associated with
sediment– 1/3 soluble, 2/3
insoluble in water– Feeds algal blooms
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Stormwater BMP Maintenance & Inspection
Pollutants• Total Suspended
Solids– A.K.A. sediment– # 1 water pollution
problem in NC
• Heavy Metals– Lead, zinc, cadmium– Sources: cars, truck,
industrial processes
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Stormwater BMP Maintenance & Inspection
Pollutants• Hydrocarbons
– Oil, gas, grease, etc. from cars/trucks
• Bacteria– Specified as fecal
coliform– Pest waste one source– Dumpsters, diapers,
etc.