Detention Pond Design: Engineering Stormwater Solutions for Regulatory Compliance
Updated: 4 days ago
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What a Compliant Detention Pond Design Includes
A detention pond stores runoff from new pavement and roofs, then releases it at a controlled rate so downstream properties do not flood.
Regulators review the volume, the release rate, the outlet and how the pond fits the site.
Answering those questions up front speeds review.
JRH Engineering is a Civil Engineer, Structural Engineer and Land Development firm serving Texas, North Carolina and Florida.
JRH guiding principles are: Engineering Excellence. Delivered on Time. Built on Value.
Storage Volume
Set by the governing jurisdiction's rate or a hydrologic analysis
City of Houston example: Supplement IDMS-2025-01 uses 0.8 ac-ft per acre of proposed impervious area for non-single-family tracts of 20 acres or less
Release Rate and Outlet Structure
Restrictor pipes, orifices or weirs limit outflow to the allowed rate
An emergency overflow handles storms larger than the design event
The outfall has to be legal and have capacity
Shape, Slopes and Footprint
Side slopes and depth affect safety, maintenance and land use
Retaining walls can shrink the footprint on tight sites; JRH designs walls up to 6 ft
Lift stations or underground storage where the outfall is shallow and the jurisdiction allows them
Water Quality
Many jurisdictions also require treatment, such as an extended-drawdown pond or another stormwater quality feature
Construction and Maintenance
Erosion control and a construction SWPPP during building
A maintenance plan for sediment, mowing and outlet inspection
Project: Decker Dr. Site Expansion, Baytown, TX
Industrial site expansion on Decker Drive in Baytown, Harris County
Reviewed by Harris County and the City of Baytown
Read the full Decker Dr. case study
Challenges
An unpermitted expansion created a drainage deficit
Paving did not meet current City of Baytown standards, and a fire lane was newly required
Limited land was available for storage
Objectives
Resolve the drainage deficit.
Bring paving and fire access up to city standards.
Secure both approvals without sequential delays.
Solutions JRH Engineering Provided
Civil engineering grading and drainage design
A retaining wall detention pond that maximized storage in a small footprint
Paving and fire lane redesign to City of Baytown standards
Harris County and City of Baytown submittals filed in parallel
Results:
Permit violation resolved
Both approvals pursued at the same time
Detention Pond Rules in Texas, North Carolina and Florida
Texas
See Supplement IDMS-2025-01, How to Size a Detention Pond and JRH's Detention Pond Calculator for a preliminary Houston-area estimate.
North Carolina
Erosion control plans for more than one acre need approval at least 30 days before work under G.S. 113A-57; local stormwater ordinances set detention pond criteria.
Florida
Stormwater design is reviewed through the FDEP Environmental Resource Permit program and the water management districts.
Frequently Asked Questions
What do regulators review in a detention pond design?
Storage volume, release rate, outlet structure, outfall, slopes and maintenance.
What does a detention pond outlet structure do?
It limits outflow to the allowed rate and passes larger storms through an emergency overflow.
Can a retaining wall make a detention pond smaller?
Yes, by replacing sloped sides with vertical walls, as at Decker Dr.
Does a detention pond also treat water quality?
Often; many jurisdictions require an extended-drawdown pond or another quality feature.
What rate does the City of Houston use?
0.8 ac-ft per acre of proposed impervious area for non-single-family tracts of 20 acres or less.
Does JRH Engineering obtain building permits?
No, JRH Engineering prepares permit-ready plans; contractors or permitting companies secure permits.
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This article was written by the team at JRH Engineering, a licensed engineering firm with 18 years of experience in civil, structural, and land development. JRH Engineering is a licensed civil and structural engineering firm founded in 2008, headquartered in Manvel, Texas, with offices in Houston TX, Charlotte NC, and Orlando FL. Certified WBE, WOSB, and HUB-eligible. Phone: (800) 227-9635 | sales@jrhengineering.net | jrhengineering.net. Texas PE license is F-10385. North Carolina PE license is P-3118. Florida license is 38516.
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