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This worksheet quantifies disturbances and impervious areas associated with existing and proposed construction on a site, specifically for building permit applications within critical areas.
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How to fill out impervious area and disturbance
How to fill out Impervious Area and Disturbance Calculations
01
Gather all necessary site data, including topographic maps and soil information.
02
Identify and mark the total area of the site that will remain undisturbed.
03
Calculate the area of all impervious surfaces (e.g., buildings, roads, parking lots) on the site.
04
Sum the areas of impervious surfaces to obtain the total impervious area.
05
Assess the area of any disturbed land (cleared, graded, or otherwise altered) during construction or development.
06
Document the calculations and provide any supporting evidence or maps as necessary.
Who needs Impervious Area and Disturbance Calculations?
01
Property developers who are planning new construction projects.
02
Environmental consultants conducting impact assessments.
03
Local government agencies requiring compliance with land-use regulations.
04
Civil engineers designing drainage systems and infrastructure.
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People Also Ask about
How to calculate area of disturbance?
Impervious area is a term used to refer to hard surfaces on a property that do not allow rain to soak into the ground. Roofs, garages, carports, storage sheds, commercial buildings and concrete, gravel, or asphalt driveways, sidewalks, parking lots, and patios are all considered impervious areas.
What is the impervious area of a site?
Impervious area is a term used to refer to hard surfaces on a property that do not allow rain to soak into the ground. Roofs, garages, carports, storage sheds, commercial buildings and concrete, gravel, or asphalt driveways, sidewalks, parking lots, and patios are all considered impervious areas.
What is an impervious area?
Pervious refers to the ability of a surface to absorb water. Conversely, impervious surfaces cannot absorb water. For example, the gutters on your home collect the rain water from your impervious roof. The downspouts from the gutters carry the water to a point in your pervious yard.
How to calculate the impervious area?
Calculating Impervious Surface Impervious surface areas include all the hard top manmade surfaces within the Protected Shoreland Area (PSA). After determining the ar- ea of each of these surfaces, add them together and divide their total by the area of the PSA.
What percentage of land cover is impervious?
Impervious surfaces account for 20% to 49% percent of total cover. These areas most commonly include single-family housing units. Developed, Medium Intensity -areas with a mixture of constructed materials and vegetation.
How do you calculate impervious area?
Total impervious area (TIA) = all impervious area in catchment. Effective impervious area (EIA) = impervious area in catchment that is directly connected to stream channels (i.e., precipitation falling on that area is effectively transported to stream).
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What is Impervious Area and Disturbance Calculations?
Impervious Area and Disturbance Calculations refer to the process of quantifying the areas in a specific location that cannot absorb rainfall, such as roofs, roads, and parking lots, as well as any disturbances to natural land, which may impact the environment and water quality.
Who is required to file Impervious Area and Disturbance Calculations?
Typically, developers, property owners, or contractors who are undertaking construction or land alteration activities are required to file Impervious Area and Disturbance Calculations as part of compliance with local or state environmental regulations.
How to fill out Impervious Area and Disturbance Calculations?
To fill out Impervious Area and Disturbance Calculations, one must measure the total areas of impervious surfaces, assess any land disturbances associated with the project, and provide accurate documentation and calculations according to the format required by local authorities.
What is the purpose of Impervious Area and Disturbance Calculations?
The purpose of these calculations is to assess the impact of development on drainage patterns, water quality, and to ensure compliance with environmental regulations designed to protect natural resources and manage stormwater.
What information must be reported on Impervious Area and Disturbance Calculations?
The information that must be reported includes the total area of impervious surfaces, details of any land disturbances, the type of vegetation changed, and any measures being taken to mitigate environmental impacts.
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