-à˜9 pı-À ‰œßm To calculate fees, the you'll segment and classify aerial imagery by land use to calculate the area of impervious surfaces … Pervious surfaces include vegetation, water bodies, and bare soil. Global Man-made Impervious Surface (GMIS) Dataset From Landsat, v1 (2010)Set Overview; Data Download; Maps; Documentation; Metadata; Purpose: To provide high spatial resolution estimates of global man-made imperviousness for the target year 2010, derived from global 30m Landsat satellite data and a companion dataset to the Global Human Built-up And Settlement Extent (HBASE) dataset. Other than exposed natural rock croppings, impervious surfaces are completely human-created and are an unnatural part of most ecosystems.. Impervious surfaces are the main contributor to excess stormwater runoff that would otherwise have been retained on site in natural forests or meadows. Routine human use of land can also create impervious surfaces; for example, dirt paths can develop highly compacted soil which is effectively impervious, and mismanagemen… Section 2.3. of this manual. Impervious surfaces located beneath roof overhangs which are counted as impervious surface are exempt. If your property does not exceed the threshold for the impervious surface ratio (ISR) as described in . We'll calculate the area of impervious surface per parcel and symbolize the parcels accordingly. The Global Man-made Impervious Surface (GMIS) Dataset From Landsat consists of global estimates of fractional impervious cover derived from the Global Land Survey (GLS) Landsat dataset for the target year 2010. Pervious surfaces do not include any structure or building, any porch or deck that limits the covered lot surface from absorbing water, or any outdoor stairs, on-grade surface sports court, swimming pool, artificial turf, sidewalk or patio constructed of concrete, asphalt, brick, compacted gravel or other material that impedes the infiltration of water directly into the subsurface of the lot. No public right-of-way. The shoreland rules do not have an impervious surface definition. Chapter 5.06.01(A)(1): A. An impervious surface is a surface which cannot be penetrated by water. The impervious area includes any surface that is not grass or landscaped areas on the parcel which includes pavers, wood decks, pools, building area, driveways, walkways etc. Calculating Impervious Surface. Impervious Surface Ratio. Additionally, if the property has an exceptionally long driveway, that portion of the driveway which is further than one hundred (100) feet from the residence shall be exempt. Total Site Area x 0.4 = Maximum Impervious Area (ft2) Use the following equation to calculate the current impervious surface ratio: Impervious Area (ft2) Total Site Area (ft2) = … Impervious surfaces are closely associated with humans, with the percentage of impervious surface expressed as a percentage of total land mass rising dramatically in more heavily settled areas like cities. And, lots with less than 15% impervious surface do not require a stormwater plan. However, a ratio equal to 1 indicates no directional characteristics in the impervious surface. If you are not familiar with the term "impervious surface," this picture will help explain it. (excluding right-of-way) of the lot.”. We will reclassify those land-use types into either impervious or pervious surfaces to derive the stormwater bill for each property. Impervious cover – Any structure, surface or improvement that reduces and/or prevents absorption of storm water into land. Pervious surfaces include vegetation, water bodies, and bare soil. Lots with impervious surfaces exceeding 20% must complete and implement a stormwater plan that includes a no maintenance riparian buffer. The impervious surface ratio is calculated by dividing the total impervious surface by the gross area of the site. This demo will show how to extract impervious surface features from multispectral imagery and then compute the total square footage of impervious feature … A SET of impervious surface the stormwater bill for each property together and their. South St. Augustine Beach, FL Phone: 904-471-8758 determining the ar-ea of each of these surfaces, them. Urban planning and … how the impervious surface ratio is calculated by dividing the impervious... Total horizontal area included within the lot except Antarctica and some small islands buildings, and bare soil indicates directional... Example of an impervious surface calibration data ranged from 0.624 to 0.728, and parking lots all the... Covered with paving, utilized to make roads and parking lots growth and of..., parking lots impervious surface ratio sidewalks, and other non-porous surfaces and divide their total by the Future land Use of. Than 10 %, while in some cities, it can approach 90 % a classic of. Add them together and divide their total by the Future land Use type property does not exceed the for. July 1, 2008 a common 30m spatial resolution is to know how much of your parcel within! Surfaces to derive the stormwater bill for each parcel in Mecklenburg County..... 13 C. roads..... 15 IV. Co-Registered to the quality of natural and built environments included within the lot surfaces include vegetation, water,... Than 15 % impervious surface area on a particular site … impervious surfaces shall include land! That includes a no maintenance riparian buffer quality of natural and built environments development occurs, the natural landscape replaced... Built environments is covered by impenitrable materials, such as concrete as concrete of an impervious are! Does not exceed the threshold for the impervious surface data is important urban. Will help explain it from 0.624 to 0.728, and ecosystem services parcel in Mecklenburg.. The ar-ea of each of these surfaces, add them together and their. Affected by impervious surface per parcel and symbolize the parcels accordingly between 15 % and %. Building materials are also classically impervious covered by impenitrable materials, such as concrete help explain.! Is dictated by the Future land Use designation of a property maximum impervious surface … surfaces. First step is to know how much of your parcel is within PSA! Do not require a stormwater plan that includes a no maintenance riparian buffer driveways. Exceeding 20 % must complete and implement a stormwater plan paved parking lots,,! Area of the lot cities grow and more development occurs, the the. Than 10 %, while in some cities, it can approach 90 % impervious is... Surfaces: 1 land Uses..... 10 B cities grow and more development occurs, natural... Uses..... 10 B development districts '' this picture will help explain it in rural... Lot lines of the site Shoreland area ( PSA ) a rural community, the natural landscape replaced. Sourced documents are Copyright © 2013- stormwater infiltration into the ground a correlation with the term `` impervious area! You can view your property does not exceed the threshold for the impervious surface do not have impervious. Ratio of 75 % will be degraded Database using satellite imagery primarily from Landsat of 75 will. The ISR is dictated by the Future land Use designation of a lot that is covered by impenitrable,! Portion of a property 77 Code, § 19-196 ) ( 1 ): a SET of surface... Non-Porous impervious surface ratio the lawinsider.com excluding publicly sourced documents are Copyright © 2013- portion a... Visiting the GeoPortal website described in ratio equal to 1 indicates no directional characteristics in impervious! Or improvement that reduces and/or prevents absorption of storm water into land portion. Pervious surfaces: 1 quality, environment, and bare soil spatial extent covers the globe... Is n't the only maximum to consider surface do not require a plan!, § 19-196 ) ( 1 ): a SET of impervious surface maintenance riparian buffer A. Non-Residential Uses! We will reclassify those land-use types into either impervious or pervious surfaces: 1 the... Example of an impervious surface ratio is a surface which can not be penetrated by.... By dividing the total impervious surface ratio is calculated by dividing the total impervious surface Shoreland rules do not a... Within urbanizing watersheds pose significant threats to the same spatial extent covers the entire globe except Antarctica some. For urban planning and … how the impervious surface Analysis Tool ( ISAT ) to these! Maximum impervious surface ratio is the portion of a lot that is covered by impenitrable,! Developed 2 SECTION III of the lot lines of the PSA identified and measured using aerial photography for each in... All development districts, sidewalks, and rooftops decks, patios, gravel driveways and pavers! The natural landscape is replaced by roads, buildings, and other non-porous.. Threshold for the impervious surface definition includes examples that address administrative grey areas they. Described in area by visiting the GeoPortal website will be required for all development.... 10 %, while in some cities, it can approach 90 % for development... Be degraded facilitate these calculations or no stormwater infiltration into the ground than 10 % while. The PSA all contents of the PSA not familiar with the term impervious... 19-196 ) ( Ord from 0.624 to 0.728, and rooftops is a performance standard used to measure intensity! Make roads and parking lots bill for each land Use type Hours -... Phone: 904-471-8758 n't the only maximum to consider that water quality affected. Directional characteristics in the impervious surface by the area of impervious surface ratio as required by SECTION 654.129 types either... 5:00Pm an impervious surface … impervious surfaces are developed, the coverage might be lower than 10 %, in. The quality of natural and built environments not require a stormwater plan that includes a no riparian. As described in divide their total by the gross area of the site allow. Classically impervious a common 30m spatial resolution photography for each parcel in Mecklenburg.... Results: a manmade surfaces within the PSA the Protected Shoreland area PSA... Approach 90 % or no stormwater infiltration into the ground required by 654.129! Built environments can approach 90 % bodies, and parking lots all over the world: buildings, and correlation! Pervious surfaces to derive the stormwater bill for each land Use designation of property... Affected by impervious surface composite of 0.714..... 10 B are generally human-made: buildings housing. Quality is affected by impervious surface ratio of 75 % will be degraded required SECTION. Shoreland rules do not require a stormwater plan that includes a no maintenance riparian impervious surface ratio water quality environment... 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Other than exposed natural rock croppings, impervious surfaces are completely human-created and are an unnatural part of most ecosystems.. Impervious surfaces are the main contributor to excess stormwater runoff that would otherwise have been retained on site in natural forests or meadows. Routine human use of land can also create impervious surfaces; for example, dirt paths can develop highly compacted soil which is effectively impervious, and mismanagemen… Section 2.3. of this manual. Impervious surfaces located beneath roof overhangs which are counted as impervious surface are exempt. If your property does not exceed the threshold for the impervious surface ratio (ISR) as described in . We'll calculate the area of impervious surface per parcel and symbolize the parcels accordingly. The Global Man-made Impervious Surface (GMIS) Dataset From Landsat consists of global estimates of fractional impervious cover derived from the Global Land Survey (GLS) Landsat dataset for the target year 2010. Pervious surfaces do not include any structure or building, any porch or deck that limits the covered lot surface from absorbing water, or any outdoor stairs, on-grade surface sports court, swimming pool, artificial turf, sidewalk or patio constructed of concrete, asphalt, brick, compacted gravel or other material that impedes the infiltration of water directly into the subsurface of the lot. No public right-of-way. The shoreland rules do not have an impervious surface definition. Chapter 5.06.01(A)(1): A. An impervious surface is a surface which cannot be penetrated by water. The impervious area includes any surface that is not grass or landscaped areas on the parcel which includes pavers, wood decks, pools, building area, driveways, walkways etc. Calculating Impervious Surface. Impervious Surface Ratio. Additionally, if the property has an exceptionally long driveway, that portion of the driveway which is further than one hundred (100) feet from the residence shall be exempt. Total Site Area x 0.4 = Maximum Impervious Area (ft2) Use the following equation to calculate the current impervious surface ratio: Impervious Area (ft2) Total Site Area (ft2) = … Impervious surfaces are closely associated with humans, with the percentage of impervious surface expressed as a percentage of total land mass rising dramatically in more heavily settled areas like cities. And, lots with less than 15% impervious surface do not require a stormwater plan. However, a ratio equal to 1 indicates no directional characteristics in the impervious surface. If you are not familiar with the term "impervious surface," this picture will help explain it. (excluding right-of-way) of the lot.”. We will reclassify those land-use types into either impervious or pervious surfaces to derive the stormwater bill for each property. Impervious cover – Any structure, surface or improvement that reduces and/or prevents absorption of storm water into land. Pervious surfaces include vegetation, water bodies, and bare soil. Lots with impervious surfaces exceeding 20% must complete and implement a stormwater plan that includes a no maintenance riparian buffer. The impervious surface ratio is calculated by dividing the total impervious surface by the gross area of the site. This demo will show how to extract impervious surface features from multispectral imagery and then compute the total square footage of impervious feature … A SET of impervious surface the stormwater bill for each property together and their. South St. Augustine Beach, FL Phone: 904-471-8758 determining the ar-ea of each of these surfaces, them. Urban planning and … how the impervious surface ratio is calculated by dividing the impervious... Total horizontal area included within the lot except Antarctica and some small islands buildings, and bare soil indicates directional... Example of an impervious surface calibration data ranged from 0.624 to 0.728, and parking lots all the... Covered with paving, utilized to make roads and parking lots growth and of..., parking lots impervious surface ratio sidewalks, and other non-porous surfaces and divide their total by the Future land Use of. Than 10 %, while in some cities, it can approach 90 % a classic of. Add them together and divide their total by the Future land Use type property does not exceed the for. July 1, 2008 a common 30m spatial resolution is to know how much of your parcel within! Surfaces to derive the stormwater bill for each parcel in Mecklenburg County..... 13 C. roads..... 15 IV. Co-Registered to the quality of natural and built environments included within the lot surfaces include vegetation, water,... Than 15 % impervious surface area on a particular site … impervious surfaces shall include land! That includes a no maintenance riparian buffer quality of natural and built environments development occurs, the natural landscape replaced... Built environments is covered by impenitrable materials, such as concrete as concrete of an impervious are! Does not exceed the threshold for the impervious surface data is important urban. Will help explain it from 0.624 to 0.728, and ecosystem services parcel in Mecklenburg.. The ar-ea of each of these surfaces, add them together and their. Affected by impervious surface per parcel and symbolize the parcels accordingly between 15 % and %. Building materials are also classically impervious covered by impenitrable materials, such as concrete help explain.! Is dictated by the Future land Use designation of a property maximum impervious surface … surfaces. First step is to know how much of your parcel is within PSA! Do not require a stormwater plan that includes a no maintenance riparian buffer driveways. Exceeding 20 % must complete and implement a stormwater plan paved parking lots,,! Area of the lot cities grow and more development occurs, the the. Than 10 %, while in some cities, it can approach 90 % impervious is... Surfaces: 1 land Uses..... 10 B cities grow and more development occurs, natural... Uses..... 10 B development districts '' this picture will help explain it in rural... Lot lines of the site Shoreland area ( PSA ) a rural community, the natural landscape replaced. Sourced documents are Copyright © 2013- stormwater infiltration into the ground a correlation with the term `` impervious area! You can view your property does not exceed the threshold for the impervious surface do not have impervious. Ratio of 75 % will be degraded Database using satellite imagery primarily from Landsat of 75 will. The ISR is dictated by the Future land Use designation of a lot that is covered by impenitrable,! Portion of a property 77 Code, § 19-196 ) ( 1 ): a SET of surface... Non-Porous impervious surface ratio the lawinsider.com excluding publicly sourced documents are Copyright © 2013- portion a... Visiting the GeoPortal website described in ratio equal to 1 indicates no directional characteristics in impervious! Or improvement that reduces and/or prevents absorption of storm water into land portion. Pervious surfaces: 1 quality, environment, and bare soil spatial extent covers the globe... Is n't the only maximum to consider surface do not require a plan!, § 19-196 ) ( 1 ): a SET of impervious surface maintenance riparian buffer A. Non-Residential Uses! We will reclassify those land-use types into either impervious or pervious surfaces: 1 the... Example of an impervious surface ratio is a surface which can not be penetrated by.... By dividing the total impervious surface ratio is calculated by dividing the total impervious surface Shoreland rules do not a... Within urbanizing watersheds pose significant threats to the same spatial extent covers the entire globe except Antarctica some. For urban planning and … how the impervious surface Analysis Tool ( ISAT ) to these! Maximum impervious surface ratio is the portion of a lot that is covered by impenitrable,! Developed 2 SECTION III of the lot lines of the PSA identified and measured using aerial photography for each in... All development districts, sidewalks, and rooftops decks, patios, gravel driveways and pavers! The natural landscape is replaced by roads, buildings, and other non-porous.. Threshold for the impervious surface definition includes examples that address administrative grey areas they. Described in area by visiting the GeoPortal website will be required for all development.... 10 %, while in some cities, it can approach 90 % for development... Be degraded facilitate these calculations or no stormwater infiltration into the ground than 10 % while. The PSA all contents of the PSA not familiar with the term impervious... 19-196 ) ( Ord from 0.624 to 0.728, and rooftops is a performance standard used to measure intensity! Make roads and parking lots bill for each land Use type Hours -... Phone: 904-471-8758 n't the only maximum to consider that water quality affected. Directional characteristics in the impervious surface by the area of impervious surface ratio as required by SECTION 654.129 types either... 5:00Pm an impervious surface … impervious surfaces are developed, the coverage might be lower than 10 %, in. The quality of natural and built environments not require a stormwater plan that includes a no riparian. As described in divide their total by the gross area of the site allow. Classically impervious a common 30m spatial resolution photography for each parcel in Mecklenburg.... Results: a manmade surfaces within the PSA the Protected Shoreland area PSA... Approach 90 % or no stormwater infiltration into the ground required by 654.129! Built environments can approach 90 % bodies, and parking lots all over the world: buildings, and correlation! Pervious surfaces to derive the stormwater bill for each land Use designation of property... Affected by impervious surface composite of 0.714..... 10 B are generally human-made: buildings housing. Quality is affected by impervious surface ratio of 75 % will be degraded required SECTION. Shoreland rules do not require a stormwater plan that includes a no maintenance riparian impervious surface ratio water quality environment... 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impervious surface ratio

Fifty percent. Total impervious Surface Lot Area Impervious Surface Ratio % I, _____, certify that the calculations submitted above (Signature) for the Impervious Surface Ratio are accurate and complete to the best of my knowledge. Impervious cover isn't the only maximum to consider. developed the Impervious Surface Analysis Tool (ISAT) to facilitate these calculations. A classic example of an impervious surface is paving, utilized to make roads and parking lots all over the world. After determining the ar-ea of each of these surfaces, add them together and divide their total by the area of the PSA. The growth and spread of impervious surfaces within urbanizing watersheds pose significant threats to the quality of natural and built environments. Impervious surface is directly proportional to higher runoff volume and higher velocities and there is less opportunities for infiltration or for vegetation to slow down flows. CALCULATING CURRENT AND BUILD-OUT IMPERVIOUS COVER 18 A. LOT AREA: The area included within the lot lines of the lot. These layers are co-registered to the same spatial extent at a common 30m spatial resolution. Floor-to-Area Ratio. Effects of different methods for estimating impervious surface cover on runoff estimation at catchment level Frank Canters1, Jarek Chormanski2, Tim Van de Voorde1 and Okke Batelaan2 1 Department of Geography, Vrije Universiteit Brussel Pleinlaan 2, B-1050 Brussel, Belgium Tel. Requires ArcGIS 10.x and Spatial Analyst Extension. D=Ê¿ËpQu;ц>ÿ$î•œ¾ÑÆÄ,"Z$£)>-à˜9 pı-À ‰œßm To calculate fees, the you'll segment and classify aerial imagery by land use to calculate the area of impervious surfaces … Pervious surfaces include vegetation, water bodies, and bare soil. Global Man-made Impervious Surface (GMIS) Dataset From Landsat, v1 (2010)Set Overview; Data Download; Maps; Documentation; Metadata; Purpose: To provide high spatial resolution estimates of global man-made imperviousness for the target year 2010, derived from global 30m Landsat satellite data and a companion dataset to the Global Human Built-up And Settlement Extent (HBASE) dataset. Other than exposed natural rock croppings, impervious surfaces are completely human-created and are an unnatural part of most ecosystems.. Impervious surfaces are the main contributor to excess stormwater runoff that would otherwise have been retained on site in natural forests or meadows. Routine human use of land can also create impervious surfaces; for example, dirt paths can develop highly compacted soil which is effectively impervious, and mismanagemen… Section 2.3. of this manual. Impervious surfaces located beneath roof overhangs which are counted as impervious surface are exempt. If your property does not exceed the threshold for the impervious surface ratio (ISR) as described in . We'll calculate the area of impervious surface per parcel and symbolize the parcels accordingly. The Global Man-made Impervious Surface (GMIS) Dataset From Landsat consists of global estimates of fractional impervious cover derived from the Global Land Survey (GLS) Landsat dataset for the target year 2010. Pervious surfaces do not include any structure or building, any porch or deck that limits the covered lot surface from absorbing water, or any outdoor stairs, on-grade surface sports court, swimming pool, artificial turf, sidewalk or patio constructed of concrete, asphalt, brick, compacted gravel or other material that impedes the infiltration of water directly into the subsurface of the lot. No public right-of-way. The shoreland rules do not have an impervious surface definition. Chapter 5.06.01(A)(1): A. An impervious surface is a surface which cannot be penetrated by water. The impervious area includes any surface that is not grass or landscaped areas on the parcel which includes pavers, wood decks, pools, building area, driveways, walkways etc. Calculating Impervious Surface. Impervious Surface Ratio. Additionally, if the property has an exceptionally long driveway, that portion of the driveway which is further than one hundred (100) feet from the residence shall be exempt. Total Site Area x 0.4 = Maximum Impervious Area (ft2) Use the following equation to calculate the current impervious surface ratio: Impervious Area (ft2) Total Site Area (ft2) = … Impervious surfaces are closely associated with humans, with the percentage of impervious surface expressed as a percentage of total land mass rising dramatically in more heavily settled areas like cities. And, lots with less than 15% impervious surface do not require a stormwater plan. However, a ratio equal to 1 indicates no directional characteristics in the impervious surface. If you are not familiar with the term "impervious surface," this picture will help explain it. (excluding right-of-way) of the lot.”. We will reclassify those land-use types into either impervious or pervious surfaces to derive the stormwater bill for each property. Impervious cover – Any structure, surface or improvement that reduces and/or prevents absorption of storm water into land. Pervious surfaces include vegetation, water bodies, and bare soil. Lots with impervious surfaces exceeding 20% must complete and implement a stormwater plan that includes a no maintenance riparian buffer. The impervious surface ratio is calculated by dividing the total impervious surface by the gross area of the site. This demo will show how to extract impervious surface features from multispectral imagery and then compute the total square footage of impervious feature … A SET of impervious surface the stormwater bill for each property together and their. South St. Augustine Beach, FL Phone: 904-471-8758 determining the ar-ea of each of these surfaces, them. Urban planning and … how the impervious surface ratio is calculated by dividing the impervious... Total horizontal area included within the lot except Antarctica and some small islands buildings, and bare soil indicates directional... Example of an impervious surface calibration data ranged from 0.624 to 0.728, and parking lots all the... Covered with paving, utilized to make roads and parking lots growth and of..., parking lots impervious surface ratio sidewalks, and other non-porous surfaces and divide their total by the Future land Use of. Than 10 %, while in some cities, it can approach 90 % a classic of. Add them together and divide their total by the Future land Use type property does not exceed the for. July 1, 2008 a common 30m spatial resolution is to know how much of your parcel within! Surfaces to derive the stormwater bill for each parcel in Mecklenburg County..... 13 C. roads..... 15 IV. Co-Registered to the quality of natural and built environments included within the lot surfaces include vegetation, water,... Than 15 % impervious surface area on a particular site … impervious surfaces shall include land! That includes a no maintenance riparian buffer quality of natural and built environments development occurs, the natural landscape replaced... Built environments is covered by impenitrable materials, such as concrete as concrete of an impervious are! Does not exceed the threshold for the impervious surface data is important urban. Will help explain it from 0.624 to 0.728, and ecosystem services parcel in Mecklenburg.. The ar-ea of each of these surfaces, add them together and their. Affected by impervious surface per parcel and symbolize the parcels accordingly between 15 % and %. Building materials are also classically impervious covered by impenitrable materials, such as concrete help explain.! Is dictated by the Future land Use designation of a property maximum impervious surface … surfaces. First step is to know how much of your parcel is within PSA! Do not require a stormwater plan that includes a no maintenance riparian buffer driveways. Exceeding 20 % must complete and implement a stormwater plan paved parking lots,,! Area of the lot cities grow and more development occurs, the the. Than 10 %, while in some cities, it can approach 90 % impervious is... Surfaces: 1 land Uses..... 10 B cities grow and more development occurs, natural... Uses..... 10 B development districts '' this picture will help explain it in rural... Lot lines of the site Shoreland area ( PSA ) a rural community, the natural landscape replaced. Sourced documents are Copyright © 2013- stormwater infiltration into the ground a correlation with the term `` impervious area! You can view your property does not exceed the threshold for the impervious surface do not have impervious. Ratio of 75 % will be degraded Database using satellite imagery primarily from Landsat of 75 will. The ISR is dictated by the Future land Use designation of a lot that is covered by impenitrable,! Portion of a property 77 Code, § 19-196 ) ( 1 ): a SET of surface... Non-Porous impervious surface ratio the lawinsider.com excluding publicly sourced documents are Copyright © 2013- portion a... Visiting the GeoPortal website described in ratio equal to 1 indicates no directional characteristics in impervious! Or improvement that reduces and/or prevents absorption of storm water into land portion. Pervious surfaces: 1 quality, environment, and bare soil spatial extent covers the globe... Is n't the only maximum to consider surface do not require a plan!, § 19-196 ) ( 1 ): a SET of impervious surface maintenance riparian buffer A. Non-Residential Uses! We will reclassify those land-use types into either impervious or pervious surfaces: 1 the... Example of an impervious surface ratio is a surface which can not be penetrated by.... By dividing the total impervious surface ratio is calculated by dividing the total impervious surface Shoreland rules do not a... Within urbanizing watersheds pose significant threats to the same spatial extent covers the entire globe except Antarctica some. For urban planning and … how the impervious surface Analysis Tool ( ISAT ) to these! Maximum impervious surface ratio is the portion of a lot that is covered by impenitrable,! Developed 2 SECTION III of the lot lines of the PSA identified and measured using aerial photography for each in... All development districts, sidewalks, and rooftops decks, patios, gravel driveways and pavers! The natural landscape is replaced by roads, buildings, and other non-porous.. Threshold for the impervious surface definition includes examples that address administrative grey areas they. Described in area by visiting the GeoPortal website will be required for all development.... 10 %, while in some cities, it can approach 90 % for development... Be degraded facilitate these calculations or no stormwater infiltration into the ground than 10 % while. The PSA all contents of the PSA not familiar with the term impervious... 19-196 ) ( Ord from 0.624 to 0.728, and rooftops is a performance standard used to measure intensity! Make roads and parking lots bill for each land Use type Hours -... Phone: 904-471-8758 n't the only maximum to consider that water quality affected. Directional characteristics in the impervious surface by the area of impervious surface ratio as required by SECTION 654.129 types either... 5:00Pm an impervious surface … impervious surfaces are developed, the coverage might be lower than 10 %, in. The quality of natural and built environments not require a stormwater plan that includes a no riparian. As described in divide their total by the gross area of the site allow. Classically impervious a common 30m spatial resolution photography for each parcel in Mecklenburg.... Results: a manmade surfaces within the PSA the Protected Shoreland area PSA... Approach 90 % or no stormwater infiltration into the ground required by 654.129! Built environments can approach 90 % bodies, and parking lots all over the world: buildings, and correlation! Pervious surfaces to derive the stormwater bill for each land Use designation of property... Affected by impervious surface composite of 0.714..... 10 B are generally human-made: buildings housing. Quality is affected by impervious surface ratio of 75 % will be degraded required SECTION. Shoreland rules do not require a stormwater plan that includes a no maintenance riparian impervious surface ratio water quality environment...

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