Post Construction Storm Water Runoff Control in New Development/Redevelopment
ALTERNATIVE TURNAROUNDS
• The reduction in impervious cover.
• The number of turnarounds modified.
• Whether or not development codes were changed to allow alternative turnarounds.
• The reduction in runoff quantity.
• Changes in the physical characteristics of streams downstream from modified areas.
ALTERNATIVE PAVERS
• Whether or not development codes were changed to allow for alternative pavers.
• The amount of new alternative paver installations added or replaced.
• The number of new development sites that use alternative pavers.
• The reduction in runoff quantity.
• Changes in the physical characteristics of streams downstream from areas with alternative paver installations.
ALUM INJECTION
• Whether or not an inventory of sites where alum injection was used was completed.
• Changes in water quality.
• Changes in biological populations.
BIORETENTION
• The reduction in impervious cover.
• The reduction in runoff quantity.
• Changes in runoff water quality (nutrients, sediments, metals, organics, etc.).
• The number of new bioretention cells installed (both commercial and residential).
• The number of acres that are drained by bioretention cells.
BMP INSPECTION AND MAINTENANCE
• The frequency of inspection and maintenance activities.
• The number of problems that were identified and remedied.
• The change in the proportion of BMPs that are well-maintained as a result of inspection and maintenance.
• Whether or not an inventory of BMPs requiring maintenance was completed and is regularly updated.
• Changes in water quality of effluent from BMPs.
BUFFER ZONES
• Whether or not development codes were changed to require buffer zones.
• The acreage of land conserved as buffers.
• The acreage of land converted to buffers.
• Changes in water quality of runoff leaving buffer areas.
• Changes in the physical characteristics of streams downstream from areas with buffer zones.
• The frequency of inspections and maintenance activities in buffer zones.
• The acreage that drains to buffer zones.
CATCH BASIN
• Whether or not an inventory of catch basins was completed.
• The number of catch basins retrofitted with filtering devices.
• The quantity of sediment removed from catch basins.
CONSERVATION EASEMENTS
• The acreage of land conserved under easements.
• Whether or not an inventory of lands that could be conserved with conservation easements was completed.
DRY EXTENDED DETENTION PONDS
• The reduction in runoff quantity.
• Changes in water quality of effluent from the dry pond outlet.
• The number of new dry ponds installed.
• The acreage of land drained by dry ponds.
ELIMINATING CURBS AND GUTTERS
• Whether or not development codes were changed.
• The reduction in runoff quantity.
• The number of new developments without curbs and gutters.
• The number of curb cuts made in existing developments.
• The number of miles of gutterless streets.
GRASSED SWALES
• The number of new grassed swales installed.
• The miles of streets with grassed swales.
• The reduction in runoff quantity.
• The reduction in runoff velocity.
• Changes in water quality of runoff from areas with grassed swales.
• The number of acres drained by grassed swales.
GRASSED FILTER STRIP
• The number of new grassed filter strips installed.
• The miles of streets with grassed filter strips.
• The reduction in runoff quantity.
• The reduction in runoff velocity.
• Changes in water quality of runoff from areas with grassed filter strips.
• The number of acres drained by grassed filter strips.
GREEN PARKING
• Whether or not development codes were changed to allow green parking.
• The number of new green parking lots installed.
• The reduction in runoff quantity.
• The number of impervious acres served by green parking lots.
• The number of impervious lots converted to green lots.
IN-LINE STORAGE
• The reduction in peak flow of runoff.
• The number of basins retrofitted with flow regulators.
• The acreage drained by in-line storage systems.
INFILTRATION BASIN
• The reduction in runoff quantity.
• Changes in water quality.
• The number of new infiltration basins installed.
• The acreage drained by infiltration basins.
INFILTRATION TRENCH
• The reduction in runoff quantity.
• Changes in water quality.
• The number of new infiltration trenches installed.
• The acreage drained by infiltration trenches.
INFRASTRUCTURE PLANNING
• Whether or not development codes were modified.
• The number of new developments using storm water BMPs.
• The reduction in impervious surface area and infrastructure.
MANUFACTURED PRODUCTS FOR STORM WATER INLETS
• Whether or not an inventory of areas where installation of manufactured products would be appropriate was completed.
• Whether or not a review was conducted to identify which products would be best for each inlet.
• The number of manufactured products installed in storm water inlets.
• Changes in water quality.
NARROWER RESIDENTIAL STREETS
• Whether or not development codes were modified.
• The reduction in impervious surface area.
• The number of new developments that use narrow streets.
• The number of miles of narrow streets.
ON-LOT TREATMENT
• The reduction in runoff quantity.
• The reduction in runoff peak flow.
• The number of lots that use on-lot treatment.
• The acreage of impervious surfaces that drain to on-lot treatment BMPs.
• The number of manufactured products sold to store runoff on-site (i.e., rainbarrels).
• Changes in water quality downstream from areas that use on-lot treatment.
OPEN SPACE DESIGN
• Whether or not development codes were modified to accommodate open space developments.
• The number of new developments that use open space design principles.
• The number of acres of open space preserved with open space design.
ORDINANCES FOR POSTCONSTRUCTION RUNOFF
• Whether or not an ordinance was developed to address post-construction runoff.
• The projected amount of impervious cover reduced under the new ordinance.
• The number of enforcement actions that occur as a result of the new ordinance.
POROUS PAVEMENT
• Whether or not development codes were modified to allow for porous pavement.
• The amount of new porous pavement added or replaced.
• The number of new development sites that use porous pavement.
• The reduction in runoff quantity.
• Changes in the physical characteristics of streams downstream from areas with porous pavement installations.
SAND AND ORGANIC FILTERS
• Changes in water quality.
• The reduction in runoff quantity.
• The number of new sand and organic filters installed.
• The acreage of impervious surface that drains to sand and organic filters.
STORM WATER WETLAND
• Changes in water quality.
• The reduction in runoff quantity.
• The number of storm water wetlands created.
• The acreage of impervious surface that drains to storm water wetlands.
URBAN FORESTRY
• Whether or not development codes were modified to promote urban forestry.
• Whether or not an ordinance was developed to promote urban forestry.
• The number of trees planted as a result of urban forestry initiatives.
• The acreage of treed land.
• The reduction in runoff quantity.
• Changes in water quality.
• The acreage of forest habitat created.
• Aesthetic and shade benefits.
WET PONDS
• Changes in water quality.
• The reduction in runoff quantity.
• The number of wet ponds installed.
• The acreage of impervious surface that drains to wet ponds.
ZONING
• Whether or not development codes were modified.
• The amount of open space protected with new zoning codes.
• The projected number of new storm water treatment areas expected under the new zoning codes.
• The projected number of upgrades to existing storm water facilities expected as a result of changes in expected development density.
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