§ 165-201.09
Extracted standards
5 individual requirements pulled out of this section’s prose, each with the sentence it came from.
Other
- Conveyance 100-year storm100 year
Conveyance systems for such developments shall be designed to convey a storm with a one-hundred-year frequency within a controlled spillway.
- Conveyance 10-year storm10 year
Storm drainage conveyance systems for developments requiring site plan approval shall be designed to convey a storm with a ten-year frequency without surcharging inlets.
- Drainage easement
Whenever a development requiring site plan approval is traversed by a watercourse, drainageway, channel or stream, a drainage easement shall be provided.
- Runoff rate
All developments requiring site plan approval shall limit the rate of stormwater runoff so that no greater rate of runoff from the site is permitted than that occurring prior to development for storms with a two-, ten- and twenty-five-year frequency.
- Stormwater storage25 year
Where necessary, a stormwater storage system shall be provided to accommodate a postdevelopment storm with a twenty-five-year, twenty-four-hour frequency, to be released at a rate not to exceed the predevelopment discharge for a storm with a ten-year, twenty-four-hour frequency.
From the ordinance
All development in Frederick County shall meet the requirements of Chapter 79, Erosion and Sediment Control. All developments requiring site plan approval shall limit the rate of stormwater runoff so that no greater rate of runoff from the site is permitted than that occurring prior to development for storms with a two-, ten- and twenty-five-year frequency. Storm drainage conveyance systems shall be designed to convey a storm with a ten-year frequency without surcharging inlets. Conveyance systems shall be designed to convey a storm with a one-hundred-year frequency within a controlled spillway. Stormwater storage system shall be provided to accommodate a postdevelopment storm with a twenty-five-year, twenty-four-hour frequency.