2022 18 ORDINANCE - Laserfiche WebLink

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ORDINANCE NO. 2022-18 Page 20 percentage, select the 24-hour Critical Storm from Table 3. Table 3: 24 -Hour Critical Sto E. Stormwater Management for Previously Developed Areas SCMs on previously developed sites must meet the criteria in the Construction General Permit. 1128.10 ALTERNATIVE ACTIONS A. When the Village determines that site constraints compromise the intent of this regulation, off-site alternatives may be used that result in an improvement of water quality and a reduction of stormwater quantity. Such alternatives shall meet the standards in the Construction General Permit and shall achieve the same level of stormwater quantity control that would be achieved by the on-site controls required under this regulation. The Village Engineer may require proof of Ohio EPA review and approval for any alternative action proposed. If the Percentage of Increase in Volume of Runoff is: The Critical Storm will be: Equal to or Greater Than: and Less Than: ---- 10 1 year 10 20 2 year 0 50 5 year 50 100 10 year 100 250 25 year 50 500 50 year 500 --- 100 year For example, if the percent increase between the pre- and post -development runoff volume for a 1 -year storm is 35%, the Critical Storm is a 5 -year storm. The peak discharge rate of runoff for all storms up to this frequency shall be controlled so as not to exceed the peak discharge rate from the 1 -year frequency storm under pre -development conditions in the development drainage area. The post -development runoff from all less frequent storms need only be controlled to meet pre -development peak discharge rates for each of those same storms. E. Stormwater Management for Previously Developed Areas SCMs on previously developed sites must meet the criteria in the Construction General Permit. 1128.10 ALTERNATIVE ACTIONS A. When the Village determines that site constraints compromise the intent of this regulation, off-site alternatives may be used that result in an improvement of water quality and a reduction of stormwater quantity. Such alternatives shall meet the standards in the Construction General Permit and shall achieve the same level of stormwater quantity control that would be achieved by the on-site controls required under this regulation. The Village Engineer may require proof of Ohio EPA review and approval for any alternative action proposed.