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Permit/Case No. Number: ___Impervious Surface Ratio (ISR) Worksheet Impervious surface means any material that prevents absorption of storm water into the ground. Impervious surface ratio (ISR) means
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How to fill out impervious surface ratio isr

How to fill out impervious surface ratio isr
01
Determine the total area of impervious surfaces on the property.
02
Calculate the total area of the property.
03
Divide the total area of impervious surfaces by the total area of the property.
04
Multiply the result by 100 to get the impervious surface ratio (ISR).
Who needs impervious surface ratio isr?
01
Urban planners
02
Environmental agencies
03
Land developers
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What is impervious surface ratio isr?
Impervious Surface Ratio (ISR) is the ratio of a surface that does not allow water to pass through it, such as asphalt or concrete, to the total surface area.
Who is required to file impervious surface ratio isr?
Property owners or developers who have impervious surfaces on their property are required to file Impervious Surface Ratio ISR.
How to fill out impervious surface ratio isr?
Impervious Surface Ratio ISR can be filled out by providing the total surface area of impervious surfaces on the property.
What is the purpose of impervious surface ratio isr?
The purpose of Impervious Surface Ratio ISR is to assess the impact of impervious surfaces on stormwater runoff and drainage systems.
What information must be reported on impervious surface ratio isr?
The information reported on Impervious Surface Ratio ISR includes the total surface area of impervious surfaces and any relevant calculations or data.
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