Get the free impervious surface calculations - Wake County Government

IMPERVIOUS SURFACE CALCULATIONS Driveway(s), i.e. concrete, pavers, gravel or other compacted area Parking pads(s), concrete, pavers, gravel or other compacted area Walkway(s), concrete, pavers, gravel

How to fill out impervious surface calculations

How to fill out impervious surface calculations:

1. Begin by gathering the necessary data and information about the area you are calculating. This includes measurements of the paved or hard surfaces, such as roads, parking lots, and buildings, as well as any additional impervious surfaces like concrete or asphalt.
2. Calculate the total area of impervious surfaces by summing up all the individual measurements you have collected. Ensure that you are consistent with units of measurement, such as square feet or square meters.
3. Determine the total amount of impervious surface area that needs to be accounted for in the calculations. This can include both existing impervious surfaces and any proposed or planned additions.
4. Next, calculate the runoff coefficient for each impervious surface type. The runoff coefficient is a value assigned to different surfaces based on how much rainwater is likely to run off from each surface. For example, a paved road may have a higher runoff coefficient than a grassy field. Assigning these coefficients accurately is crucial for accurate calculations.
5. Multiply each impervious surface area by its corresponding runoff coefficient to determine the "weighted impervious area." This calculation accounts for the varying impact different surfaces have on stormwater runoff.
6. Sum up all the weighted impervious areas to calculate the total impervious area for the site.
7. If necessary, adjust the calculations for any factors that might affect the site's hydrology, such as steep slopes, drainage patterns, or existing stormwater management practices.
8. Finally, consider the purpose of the impervious surface calculations. They are typically used for stormwater management, urban planning, environmental impact assessments, or compliance with regulations. Ensure that the calculations are performed in accordance with any relevant guidelines or standards set by the governing authority.

Who needs impervious surface calculations:

1. Engineers and urban planners use impervious surface calculations to design and assess stormwater management systems. These calculations help determine the amount of runoff that needs to be managed and design appropriate infrastructure to handle it.
2. Municipalities and local authorities may require impervious surface calculations as part of development permit applications or environmental impact assessments. These calculations enable them to evaluate the potential impacts of new construction on stormwater management and make informed decisions.
3. Environmental organizations and researchers use impervious surface calculations to study the impact of urbanization and development on water resources. These calculations help assess the effectiveness of existing stormwater management practices and identify areas requiring improvement.
4. Property owners or developers may need impervious surface calculations to understand the potential stormwater impacts of their projects and to comply with regulations or permit requirements.

Overall, anyone involved in land development, water management, or environmental planning may benefit from impervious surface calculations to understand the effects of impermeable surfaces on stormwater runoff and implement appropriate mitigation measures.

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What is impervious surface calculations?

Impervious surface calculations refer to the process of determining the amount of surface area that does not allow water to penetrate into the ground.

Who is required to file impervious surface calculations?

Property owners, developers, or municipalities may be required to file impervious surface calculations depending on local regulations and ordinances.

How to fill out impervious surface calculations?

Impervious surface calculations can be filled out by measuring the area of hard surfaces such as pavement, rooftops, and driveways to determine the total impervious area on a property.

What is the purpose of impervious surface calculations?

The purpose of impervious surface calculations is to assess the impact of development on water runoff, drainage systems, and water quality in a given area.

What information must be reported on impervious surface calculations?

Impervious surface calculations typically include the total area of impervious surfaces, methods used for calculation, and any mitigation measures taken to reduce runoff.