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From page 85... ... 85 Tables D1 and D2 provide general descriptions of several common structural stormwater BMPs, along with brief examples of benefits, challenges, and costs. For more detailed information, please see the references cited. Read the entire page →
From page 86... ... 86 Benefit–Cost Analyses Guidebook for Airport Stormwater GSI Types General Description Benefits Challenges Costs References/ Sources of Information Harvesting and Reuse Rain barrels and cisterns A holding device that collects rainwater from roofs; water can then be used for irrigation, washing hangars and airplanes, or other purposes Reduces total runoff volume up to 100%, peak-flow attenuation or elimination, stores anywhere from 200– 25,000 gallons of water for use, can be located underground, lasts 20 years or more, savings in potable water use Potential for gutters or downspouts to clog, potential for roofing materials to leach into water, local laws may prohibit rainwater capture Construction: Cistern costs range from $0.50 to $4 per gallon of storage capacity. Additional: O&M for checking gutters and gutter guards, annual cistern cleaning, initial costs and O&M associated with treatment systems Jolley et al., 2017; North Carolina Department of Environment and Natural Resources (NCDENR) Read the entire page →
From page 87... ... Stormwater BMPs 87 GSI Types General Description Benefits Challenges Costs References/ Sources of Information Bioswales Vegetated and grassy swales A concave, gently sloping, vegetated channel that transports water and allows it to infiltrate soils below Moderately removes pollutants, potentially effective total runoff volume control, lasts indefinitely, functions as a stormwater transport device Sediment buildup can cause pooling and can potentially attract hazardous wildlife, requires some maintenance depending on the vegetation New construction: $19,500 per acre for <3 acres $2,300 per acre for >3 acres Retrofit: $37,500 per acre for <3 acres $4,400 per acre for >3 acres Jolley et al., 2017; NCDENR, 2012; WSDOT, 2008 Sand Filters Sand and media filters A sand-filled basin that collects water from the first flush of stormwater runoff and filters it into underlying soil or an underdrain piping system Removes sediments and pollutants effectively, potentially effective total runoff volume control, highly adaptable, lasts approximately 50 years Potential for standing water to attract hazardous wildlife, potential to clog from high sediment loads, requires frequent maintenance, possible export of nitrogen, mobilization of existing groundwater pollutants possible if BMP is poorly sited New construction: $88,000 per acre for <3 acres $48,100 per acre for >3 acres Retrofit: $113,800 per acre for <3 acres $62,300 per acre for >3 acres Jolley et al., 2017; NCDENR, 2012; FAA, 2013; WSDOT, 2008 Filter Strips Vegetated filter strips A shallowly sloped area containing vegetation that allows sheet flow of water across its surface; typically located adjacent to runways and taxiways Removes sediments and pollutants effectively, controls 50%–100% of total runoff volume, can be used airside along runways, lasts indefinitely Depressions in the strip that collect water or vegetation could potentially attract hazardous wildlife, requires frequent mowing Cost neutral since runway safety requirements typically create one naturally (only maintenance requirements) Jolley et al., 2017; NCDENR, 2012; WSDOT, 2008 Porous Pavement Permeable pavement, porous asphalt, pervious concrete, and pavers A type of pavement that allows water to pass through; typically lies on top of an underlying drain system or gravel to facilitate percolation into the ground Allows permeability in surfaces that typically prevent infiltration, reduces total runoff volume up to 100%, removes pollutants, life span of 20 to 40 years Limited load-bearing capacity, potential source of FOD, should not be used in areas prone to spills (loading docks, fueling areas, etc.) Read the entire page →
From page 88... ... 88 Benefit–Cost Analyses Guidebook for Airport Stormwater GSI Types General Description Benefits Challenges Costs References/ Sources of Information Wetland Treatment Systems Constructed wetlands and conventional stormwater wetlands A manmade water collection system that facilitates the growth of marsh and wetland plant species either above or below ground Removes sediments and pollutants highly effectively, controls total runoff volume highly effectively, uses natural processes to filter water, lasts 20– 30 years Potential to attract hazardous wildlife given water and vegetation, high functionality requires careful design and construction New construction: $32,800 per acre for <3 acres $13,700 per acre for >3 acres Retrofit: $52,300 per acre for <3 acres $21,900 per acre for >3 acres Jolley et al., 2017; Shi et al., 2015 Table D1. (Continued) Read the entire page →

From page 85...

... 85 Tables D1 and D2 provide general descriptions of several common structural stormwater BMPs, along with brief examples of benefits, challenges, and costs. For more detailed information, please see the references cited.

Read the entire page →

From page 86...

... 86 Benefit–Cost Analyses Guidebook for Airport Stormwater GSI Types General Description Benefits Challenges Costs References/ Sources of Information Harvesting and Reuse Rain barrels and cisterns A holding device that collects rainwater from roofs; water can then be used for irrigation, washing hangars and airplanes, or other purposes Reduces total runoff volume up to 100%, peak-flow attenuation or elimination, stores anywhere from 200– 25,000 gallons of water for use, can be located underground, lasts 20 years or more, savings in potable water use Potential for gutters or downspouts to clog, potential for roofing materials to leach into water, local laws may prohibit rainwater capture Construction: Cistern costs range from $0.50 to $4 per gallon of storage capacity. Additional: O&M for checking gutters and gutter guards, annual cistern cleaning, initial costs and O&M associated with treatment systems Jolley et al., 2017; North Carolina Department of Environment and Natural Resources (NCDENR)

Read the entire page →

From page 87...

... Stormwater BMPs 87 GSI Types General Description Benefits Challenges Costs References/ Sources of Information Bioswales Vegetated and grassy swales A concave, gently sloping, vegetated channel that transports water and allows it to infiltrate soils below Moderately removes pollutants, potentially effective total runoff volume control, lasts indefinitely, functions as a stormwater transport device Sediment buildup can cause pooling and can potentially attract hazardous wildlife, requires some maintenance depending on the vegetation New construction: $19,500 per acre for <3 acres $2,300 per acre for >3 acres Retrofit: $37,500 per acre for <3 acres $4,400 per acre for >3 acres Jolley et al., 2017; NCDENR, 2012; WSDOT, 2008 Sand Filters Sand and media filters A sand-filled basin that collects water from the first flush of stormwater runoff and filters it into underlying soil or an underdrain piping system Removes sediments and pollutants effectively, potentially effective total runoff volume control, highly adaptable, lasts approximately 50 years Potential for standing water to attract hazardous wildlife, potential to clog from high sediment loads, requires frequent maintenance, possible export of nitrogen, mobilization of existing groundwater pollutants possible if BMP is poorly sited New construction: $88,000 per acre for <3 acres $48,100 per acre for >3 acres Retrofit: $113,800 per acre for <3 acres $62,300 per acre for >3 acres Jolley et al., 2017; NCDENR, 2012; FAA, 2013; WSDOT, 2008 Filter Strips Vegetated filter strips A shallowly sloped area containing vegetation that allows sheet flow of water across its surface; typically located adjacent to runways and taxiways Removes sediments and pollutants effectively, controls 50%–100% of total runoff volume, can be used airside along runways, lasts indefinitely Depressions in the strip that collect water or vegetation could potentially attract hazardous wildlife, requires frequent mowing Cost neutral since runway safety requirements typically create one naturally (only maintenance requirements) Jolley et al., 2017; NCDENR, 2012; WSDOT, 2008 Porous Pavement Permeable pavement, porous asphalt, pervious concrete, and pavers A type of pavement that allows water to pass through; typically lies on top of an underlying drain system or gravel to facilitate percolation into the ground Allows permeability in surfaces that typically prevent infiltration, reduces total runoff volume up to 100%, removes pollutants, life span of 20 to 40 years Limited load-bearing capacity, potential source of FOD, should not be used in areas prone to spills (loading docks, fueling areas, etc.)

Read the entire page →

From page 88...

... 88 Benefit–Cost Analyses Guidebook for Airport Stormwater GSI Types General Description Benefits Challenges Costs References/ Sources of Information Wetland Treatment Systems Constructed wetlands and conventional stormwater wetlands A manmade water collection system that facilitates the growth of marsh and wetland plant species either above or below ground Removes sediments and pollutants highly effectively, controls total runoff volume highly effectively, uses natural processes to filter water, lasts 20– 30 years Potential to attract hazardous wildlife given water and vegetation, high functionality requires careful design and construction New construction: $32,800 per acre for <3 acres $13,700 per acre for >3 acres Retrofit: $52,300 per acre for <3 acres $21,900 per acre for >3 acres Jolley et al., 2017; Shi et al., 2015 Table D1. (Continued)

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