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3/3/2022

RETENTION vs. DETENTION BASIN

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​In order to effectively manage stormwater for an increasing population (and therefore impervious cover), engineers design sites with retention or detention basins for more storage. Before an area is disturbed or developed, the land is classified as an permeable surface meaning water can infiltrate into the subsurface. Roads, sidewalks, houses, and other structures prevent infiltration, and to accommodate for the quantity of water that is no longer able to infiltrate we build storm sewers that direct water to basins for storage.  In addition to accommodating runoff, basins provide many other benefits including treatment by allowing for settling time and regulating the amount of water being released preventing erosion down a watershed.
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Detention Basin
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Retention Basin
A detention pond does not contain a permanent pool of water and is designed to store water temporarily before leaving the outfall structure and releasing to a stream. Detention ponds are constructed for flood events and have shorter settling and retention times than retention basins. A retention basin stores water year-round, and the outfall structure contains an orifice at a higher elevation compared to a detention pond. In Ohio, we primarily see retention ponds surrounding developments due to the higher amounts of precipitation we receive compared to out west.
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Many variables are considered when determining size and location of these stormwater control measures. Properties include rainfall intensity in the geographic location, soil type(s), land cover, distance to creek, and total impervious area after development. To learn more about basin sizing & structure requirements you can read through the Ohio EPA Construction General Permit Parts III.G.2.d.ii. and III.G.2.e.

Questions? Contact our office at (513) 695-1337 for more information from your local basin experts! Is there a basin on your property in Warren County? You can view the latest inspection report on its functionality here.

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1 Comment
Bronson Funke
3/8/2022 04:44:20 pm

I think you mean pervious or permeable instead of impervious in the second sentence.

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  • Home
    • About
    • Contact Us
    • Board Supervisors
    • Staff
    • NRCS
    • Volunteer Opportunities
  • Events
    • EQUIPMENT NEEDS SURVEY
    • Urban Chat: Runoff Reduction Methods
    • Earth Day Tree Planting
    • Pond Clinic
    • Rain Barrel Workshop
    • Mental Health First Aid
  • Services
    • Agriculture >
      • Land Preservation
      • Cover Crops
    • GIS/Mapping
    • Property Owner Assistance >
      • Drainage, Erosion & Pond Assistance
      • Soil Testing
      • Water Testing
      • Stormwater Basin Inspections
      • Backyard Conservation >
        • Ohio Native Plants
        • Rain Gardens
        • Rain Barrels
        • Composting
      • Illicit Discharge Detection Program
  • PERMITS
    • Earth Disturbing in Warren County >
      • Earth Disturbing Permit Application
    • Floodplain Management >
      • Floodplain Determination Request Form
      • Flood Applications, Forms & Documents
  • Education
    • Education Ambassador
    • Programs >
      • Classroom Programs
      • Youth Programs
      • Community Outreach
    • Virtual Classroom
    • Program Loan Portal
    • HS Envirothon >
      • Envirothon Grant Program
    • Educator Workshops
  • Caesar Creek Collaborative
    • Meet the Collaborative
    • Our Work
  • Blogs
    • Conservation Connection
    • Education Connection
    • Development Digest
  • Camp Canopy Scholarship