Stormwater Control
Group | Practice | Description | |
|---|---|---|---|
Preservation of Natural Resources | Preservation of undisturbed areas | Delineate and place into permanent conservation easement undisturbed forests, native vegetated areas, riparian corridors, wetlands and natural terrain. | |
Preservation of buffers | Define, delineate and place in permanent conservation easement naturally vegetated buffers along perennial streams, rivers, shorelines and wetlands. | ||
Reduction of clearing and grading | Limit clearing and grading to the minimum amount needed for roads, driveways, foundations, utilities and stormwater management facilities. | ||
Locating development in less sensitive areas | Avoid sensitive resource areas such as floodplains, steep slopes, erodible soils, wetlands, mature forests and critical habitats by locating development to fit the terrain in areas that will create the least impact. | ||
Open space design | Use clustering, conservation design or open space design to reduce impervious cover, preserve more open space and protect water resources. | ||
Restore the original properties and porosity of the soil by deep till and amendment with compost to reduce the generation of runoff and enhance the runoff reduction performance of practices such as downspout disconnections, grass channels, filter strips and tree clusters. | |||
Reduction of Impervious Cover | Roadway reduction | Minimize roadway widths and lengths to reduce site impervious area. | |
Sidewalk reduction | Minimize sidewalk lengths and widths to reduce site impervious area. | ||
Driveway reduction | Minimize driveway lengths and widths to reduce site impervious area. | ||
Cul-de-sac reduction | Minimize the number of culs-de-sac and incorporate landscaped areas to reduce their impervious cover. | ||
Building footprint reduction | Reduce the impervious footprint of residences and commercial buildings by using alternate or taller buildings while maintaining the same floor-to-area ratio. | ||
Parking reduction | Reduce imperviousness on parking lots by eliminating unneeded spaces, providing compact car spaces and efficient parking lanes, minimizing stall dimensions, using porous pavement surfaces in overflow parking areas, and using multistoried parking decks where appropriate and allowed. |
Group | Practice | Description | |
|---|---|---|---|
Runoff Reduction Techniques | Conservation of natural areas | Retain the pre-development hydrologic and water quality characteristics of undisturbed natural areas and stream and wetland buffers by restoring and/or permanently conserving these areas on a site. | |
Sheetflow to riparian buffers or filter strips | Undisturbed natural areas such as forested conservation areas and stream buffers or vegetated filter strips and riparian buffers can be used to treat and control stormwater runoff from some areas of a development project. | ||
Vegetated open swale | The natural drainage paths, or properly designed vegetated channels, can be used instead of constructing underground storm sewers or concrete open channels to increase time of concentration, reduce the peak discharge and provide infiltration. | ||
Tree planting/tree box | Plant or conserve trees to reduce stormwater runoff, increase nutrient uptake and provide bank stabilization. Trees can be used for applications such as landscaping, stormwater management practice areas, conservation areas and erosion and sediment control. | ||
Disconnection of rooftop runoff | Direct runoff from residential rooftop areas and upland overland runoff flow to designated pervious areas to reduce runoff volumes and rates. | ||
Stream daylighting for redevelopment projects | Stream daylight previously culverted/piped streams to restore natural habitats, better attenuate runoff by increasing the storage size and promoting infiltration, and help reduce pollutant loads. | ||
Rain garden | Manage and treat small volumes of stormwater runoff using a conditioned planting soil bed and planting materials to filter runoff stored within a shallow depression. | ||
Green roof | Capture runoff by a layer of vegetation and soil installed on top of a conventional flat or sloped roof. The rooftop vegetation allows evaporation and evapotranspiration processes to reduce volume and discharge rate of runoff entering conveyance system. | ||
Stormwater planter | Small landscaped stormwater treatment devices that can be designed as infiltration or filtering practices. Stormwater planters use soil infiltration and biogeochemical processes to decrease stormwater quantity and improve water quality. | ||
Rain tank/cistern | Capture and store stormwater runoff to be used for irrigation systems or filtered and reused for noncontact activities. | ||
Porous pavement | Pervious types of pavements that provide an alternative to conventional paved surfaces, designed to infiltrate rainfall through the surface, thereby reducing stormwater runoff from a site and providing some pollutant uptake in the underlying soils. |
Group | Practice | Description | |
|---|---|---|---|
Pond | Micropool extended detention pond (P-1) | Pond that treats the majority of the water quality volume through extended detention, and incorporates a micropool at the outlet of the pond to prevent sediment resuspension | |
Wet Pond (P-2) | Pond that provides storage for the entire water quality volume in the permanent pool | ||
Wet extended detention pond (P-3) | Pond that treats a portion of the water quality volume by detaining storm flows above a permanent pool for a specified minimum detention time | ||
Multiple pond system (P-4) | A group of ponds that collectively treats the water quality volume | ||
Pocket pond (P-5) | A stormwater wetland design adapted for the treatment of runoff from small drainage areas that has little or no baseflow available to maintain water elevations and relies on groundwater to maintain a permanent pool | ||
Wetland | Shallow wetland (W-1) | A wetland that provides water quality treatment entirely in a shallow marsh | |
Extended detention wetland (W-2) | A wetland system that provides some fraction of the water quality volume by detaining storm flows above the marsh surface | ||
Pond/wetland system (W-3) | A wetland system that provides a portion of the water quality volume in the permanent pool of a wet pond that precedes the marsh for a specified minimum detention time | ||
Pocket wetland (W-4) | A shallow wetland design adapted for the treatment of runoff from small drainage areas that has variable water levels and relies on groundwater for its permanent pool | ||
Infiltration | Infiltration trench (I-1) | An infiltration practice that stores the water quality volume in the void spaces of a gravel trench before it is infiltrated into the ground | |
Infiltration basin (I-2) | An infiltration practice that stores the water quality volume in a shallow depression before it is infiltrated into the ground | ||
Dry well (I-3) | An infiltration practice similar in design to the infiltration trench, and best suited for treatment of rooftop runoff | ||
Filtering practices | Surface sand filter (F-1) | A filtering practice that treats stormwater by settling out larger particles in a sediment chamber, and then filtering stormwater through a sand matrix | |
Underground sand filter (F-2) | A filtering practice that treats stormwater as it flows through underground settling and filtering chambers | ||
Perimeter sand filter (F-3) | A filter that incorporates a sediment chamber and filter bed as parallel vaults adjacent to a parking lot | ||
Organic filter (F-4) | A filtering practice that uses an organic medium such as compost in the filter in place of sand | ||
Bioretention (F-5) | A shallow depression that treats stormwater as it flows through a soil matrix, and is returned to the storm drain system | ||
Open channels | Dry swale (O-1) | An open drainage channel or depression explicitly designed to detain and promote the filtration of stormwater runoff into the soil media | |
Wet swale (O-2) | An open drainage channel or depression designed to retain water or intercept groundwater for water quality treatment |
Whereas, the Village of Irvington ("Municipality") and the __________ ("facility owner") want to enter into an agreement to provide for the long term maintenance and continuation of stormwater control measures approved by the Municipality for the below named project, and | |
Whereas, the Municipality and the facility owner desire that the stormwater control measures be built in accordance with the approved project plans and thereafter be maintained, cleaned, repaired, replaced and continued in perpetuity in order to ensure optimum performance of the components. Therefore, the Municipality and the facility owner agree as follows: | |
1. | This agreement binds the Municipality and the facility owner, its successors and assigns, to the maintenance provisions depicted in the approved project plans which are attached as Schedule A of this agreement. |
2. | The facility owner shall maintain, clean, repair, replace and continue the stormwater control measures depicted in Schedule A as necessary to ensure optimum performance of the measures to design specifications. The stormwater control measures shall include, but shall not be limited to, the following: drainage ditches, swales, dry wells, infiltrators, drop inlets, pipes, culverts, soil absorption devices, stormwater ponds and wetlands, bioretention and rain gardens, tree boxes, green roofs, stormwater planters, rain tanks and cisterns, and porous pavement. |
3. | The facility owner shall be responsible for all expenses related to the maintenance of the stormwater control measures and shall establish a means for the collection and distribution of expenses among parties for any commonly owned facilities. |
4. | The facility owner shall provide for the periodic inspection of the stormwater control measures, at the frequency recommended in the Design Manual, to determine the condition and integrity of the measures. Such inspection shall be performed by a professional engineer licensed by the State of New York. The inspecting engineer shall prepare and submit to the municipality, within 30 days of the inspection, a written report of the findings, including recommendations for those actions necessary for the continuation of the stormwater control measures. |
5. | The facility owner shall not authorize, undertake or permit alteration, abandonment, modification or discontinuation of the stormwater control measures except in accordance with written approval of the Municipality. |
6. | The facility owner shall undertake necessary repairs and replacement of the stormwater control measures at the direction of the Municipality or in accordance with the recommendations of the inspecting engineer. |
7. | The facility owner shall provide to the Municipality within 30 days of the date of this agreement, a security for the maintenance and continuation of the stormwater control measures in the form of (a Bond, letter of credit or escrow account). |
8. | This agreement shall be recorded in the Office of the County Clerk, County of __________ together with the deed for the common property and shall be included in the offering plan and/or prospectus approved pursuant to __________ |
9. | If ever the Municipality determines that the facility owner has failed to construct or maintain the stormwater control measures in accordance with the project plan or has failed to undertake corrective action specified by the Municipality or by the inspecting engineer, the Municipality is authorized to undertake such steps as reasonably necessary for the preservation, continuation or maintenance of the stormwater control measures and to affix the expenses thereof as a lien against the property. |
10. | This agreement is effective __________. |
Stormwater Control
Group | Practice | Description | |
|---|---|---|---|
Preservation of Natural Resources | Preservation of undisturbed areas | Delineate and place into permanent conservation easement undisturbed forests, native vegetated areas, riparian corridors, wetlands and natural terrain. | |
Preservation of buffers | Define, delineate and place in permanent conservation easement naturally vegetated buffers along perennial streams, rivers, shorelines and wetlands. | ||
Reduction of clearing and grading | Limit clearing and grading to the minimum amount needed for roads, driveways, foundations, utilities and stormwater management facilities. | ||
Locating development in less sensitive areas | Avoid sensitive resource areas such as floodplains, steep slopes, erodible soils, wetlands, mature forests and critical habitats by locating development to fit the terrain in areas that will create the least impact. | ||
Open space design | Use clustering, conservation design or open space design to reduce impervious cover, preserve more open space and protect water resources. | ||
Restore the original properties and porosity of the soil by deep till and amendment with compost to reduce the generation of runoff and enhance the runoff reduction performance of practices such as downspout disconnections, grass channels, filter strips and tree clusters. | |||
Reduction of Impervious Cover | Roadway reduction | Minimize roadway widths and lengths to reduce site impervious area. | |
Sidewalk reduction | Minimize sidewalk lengths and widths to reduce site impervious area. | ||
Driveway reduction | Minimize driveway lengths and widths to reduce site impervious area. | ||
Cul-de-sac reduction | Minimize the number of culs-de-sac and incorporate landscaped areas to reduce their impervious cover. | ||
Building footprint reduction | Reduce the impervious footprint of residences and commercial buildings by using alternate or taller buildings while maintaining the same floor-to-area ratio. | ||
Parking reduction | Reduce imperviousness on parking lots by eliminating unneeded spaces, providing compact car spaces and efficient parking lanes, minimizing stall dimensions, using porous pavement surfaces in overflow parking areas, and using multistoried parking decks where appropriate and allowed. |
Group | Practice | Description | |
|---|---|---|---|
Runoff Reduction Techniques | Conservation of natural areas | Retain the pre-development hydrologic and water quality characteristics of undisturbed natural areas and stream and wetland buffers by restoring and/or permanently conserving these areas on a site. | |
Sheetflow to riparian buffers or filter strips | Undisturbed natural areas such as forested conservation areas and stream buffers or vegetated filter strips and riparian buffers can be used to treat and control stormwater runoff from some areas of a development project. | ||
Vegetated open swale | The natural drainage paths, or properly designed vegetated channels, can be used instead of constructing underground storm sewers or concrete open channels to increase time of concentration, reduce the peak discharge and provide infiltration. | ||
Tree planting/tree box | Plant or conserve trees to reduce stormwater runoff, increase nutrient uptake and provide bank stabilization. Trees can be used for applications such as landscaping, stormwater management practice areas, conservation areas and erosion and sediment control. | ||
Disconnection of rooftop runoff | Direct runoff from residential rooftop areas and upland overland runoff flow to designated pervious areas to reduce runoff volumes and rates. | ||
Stream daylighting for redevelopment projects | Stream daylight previously culverted/piped streams to restore natural habitats, better attenuate runoff by increasing the storage size and promoting infiltration, and help reduce pollutant loads. | ||
Rain garden | Manage and treat small volumes of stormwater runoff using a conditioned planting soil bed and planting materials to filter runoff stored within a shallow depression. | ||
Green roof | Capture runoff by a layer of vegetation and soil installed on top of a conventional flat or sloped roof. The rooftop vegetation allows evaporation and evapotranspiration processes to reduce volume and discharge rate of runoff entering conveyance system. | ||
Stormwater planter | Small landscaped stormwater treatment devices that can be designed as infiltration or filtering practices. Stormwater planters use soil infiltration and biogeochemical processes to decrease stormwater quantity and improve water quality. | ||
Rain tank/cistern | Capture and store stormwater runoff to be used for irrigation systems or filtered and reused for noncontact activities. | ||
Porous pavement | Pervious types of pavements that provide an alternative to conventional paved surfaces, designed to infiltrate rainfall through the surface, thereby reducing stormwater runoff from a site and providing some pollutant uptake in the underlying soils. |
Group | Practice | Description | |
|---|---|---|---|
Pond | Micropool extended detention pond (P-1) | Pond that treats the majority of the water quality volume through extended detention, and incorporates a micropool at the outlet of the pond to prevent sediment resuspension | |
Wet Pond (P-2) | Pond that provides storage for the entire water quality volume in the permanent pool | ||
Wet extended detention pond (P-3) | Pond that treats a portion of the water quality volume by detaining storm flows above a permanent pool for a specified minimum detention time | ||
Multiple pond system (P-4) | A group of ponds that collectively treats the water quality volume | ||
Pocket pond (P-5) | A stormwater wetland design adapted for the treatment of runoff from small drainage areas that has little or no baseflow available to maintain water elevations and relies on groundwater to maintain a permanent pool | ||
Wetland | Shallow wetland (W-1) | A wetland that provides water quality treatment entirely in a shallow marsh | |
Extended detention wetland (W-2) | A wetland system that provides some fraction of the water quality volume by detaining storm flows above the marsh surface | ||
Pond/wetland system (W-3) | A wetland system that provides a portion of the water quality volume in the permanent pool of a wet pond that precedes the marsh for a specified minimum detention time | ||
Pocket wetland (W-4) | A shallow wetland design adapted for the treatment of runoff from small drainage areas that has variable water levels and relies on groundwater for its permanent pool | ||
Infiltration | Infiltration trench (I-1) | An infiltration practice that stores the water quality volume in the void spaces of a gravel trench before it is infiltrated into the ground | |
Infiltration basin (I-2) | An infiltration practice that stores the water quality volume in a shallow depression before it is infiltrated into the ground | ||
Dry well (I-3) | An infiltration practice similar in design to the infiltration trench, and best suited for treatment of rooftop runoff | ||
Filtering practices | Surface sand filter (F-1) | A filtering practice that treats stormwater by settling out larger particles in a sediment chamber, and then filtering stormwater through a sand matrix | |
Underground sand filter (F-2) | A filtering practice that treats stormwater as it flows through underground settling and filtering chambers | ||
Perimeter sand filter (F-3) | A filter that incorporates a sediment chamber and filter bed as parallel vaults adjacent to a parking lot | ||
Organic filter (F-4) | A filtering practice that uses an organic medium such as compost in the filter in place of sand | ||
Bioretention (F-5) | A shallow depression that treats stormwater as it flows through a soil matrix, and is returned to the storm drain system | ||
Open channels | Dry swale (O-1) | An open drainage channel or depression explicitly designed to detain and promote the filtration of stormwater runoff into the soil media | |
Wet swale (O-2) | An open drainage channel or depression designed to retain water or intercept groundwater for water quality treatment |
Whereas, the Village of Irvington ("Municipality") and the __________ ("facility owner") want to enter into an agreement to provide for the long term maintenance and continuation of stormwater control measures approved by the Municipality for the below named project, and | |
Whereas, the Municipality and the facility owner desire that the stormwater control measures be built in accordance with the approved project plans and thereafter be maintained, cleaned, repaired, replaced and continued in perpetuity in order to ensure optimum performance of the components. Therefore, the Municipality and the facility owner agree as follows: | |
1. | This agreement binds the Municipality and the facility owner, its successors and assigns, to the maintenance provisions depicted in the approved project plans which are attached as Schedule A of this agreement. |
2. | The facility owner shall maintain, clean, repair, replace and continue the stormwater control measures depicted in Schedule A as necessary to ensure optimum performance of the measures to design specifications. The stormwater control measures shall include, but shall not be limited to, the following: drainage ditches, swales, dry wells, infiltrators, drop inlets, pipes, culverts, soil absorption devices, stormwater ponds and wetlands, bioretention and rain gardens, tree boxes, green roofs, stormwater planters, rain tanks and cisterns, and porous pavement. |
3. | The facility owner shall be responsible for all expenses related to the maintenance of the stormwater control measures and shall establish a means for the collection and distribution of expenses among parties for any commonly owned facilities. |
4. | The facility owner shall provide for the periodic inspection of the stormwater control measures, at the frequency recommended in the Design Manual, to determine the condition and integrity of the measures. Such inspection shall be performed by a professional engineer licensed by the State of New York. The inspecting engineer shall prepare and submit to the municipality, within 30 days of the inspection, a written report of the findings, including recommendations for those actions necessary for the continuation of the stormwater control measures. |
5. | The facility owner shall not authorize, undertake or permit alteration, abandonment, modification or discontinuation of the stormwater control measures except in accordance with written approval of the Municipality. |
6. | The facility owner shall undertake necessary repairs and replacement of the stormwater control measures at the direction of the Municipality or in accordance with the recommendations of the inspecting engineer. |
7. | The facility owner shall provide to the Municipality within 30 days of the date of this agreement, a security for the maintenance and continuation of the stormwater control measures in the form of (a Bond, letter of credit or escrow account). |
8. | This agreement shall be recorded in the Office of the County Clerk, County of __________ together with the deed for the common property and shall be included in the offering plan and/or prospectus approved pursuant to __________ |
9. | If ever the Municipality determines that the facility owner has failed to construct or maintain the stormwater control measures in accordance with the project plan or has failed to undertake corrective action specified by the Municipality or by the inspecting engineer, the Municipality is authorized to undertake such steps as reasonably necessary for the preservation, continuation or maintenance of the stormwater control measures and to affix the expenses thereof as a lien against the property. |
10. | This agreement is effective __________. |