Detention Pond vs Retention Pond vs Underground Systems Explained
Updated: Sep 29
Why Choose JRH Engineering
Why Developers, Contractors & Property Owners Choose JRH
Most engineering firms talk about technical capability. We focus on what actually matters to your project: speed, cost, communication, and results.
Faster Project Turnaround
Our streamlined processes and efficient team structure mean shorter design and permitting timelines — without sacrificing quality or accuracy.
Clear & Responsive Communication
You work directly with engineers who keep you informed. No long delays or unanswered emails — just straightforward updates and quick responses.
Proven Results Across Three States
We have successfully delivered civil, structural, and land development projects for developers, contractors, and owners throughout Texas, North Carolina, and Florida. Check out JRH's case studies.
Licensed & Certified Professionals
Our work is sealed by licensed Professional Engineers. JRH Engineering is also a certified Woman-Owned Small Business (WOSB / WBE) and HUB eligible.
Choosing a Detention Pond, Retention Pond or Underground System
The stormwater system you pick can decide how much of your site stays buildable.
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.
Key Differences
Detention pond: holds stormwater temporarily and releases it slowly to control peak flow; often dry between storms
Retention pond: holds a permanent pool of water and focuses on water quality and infiltration
Underground system: stores water below grade in pipes, vaults or chambers, keeping the surface usable
Pumped or backfill systems: reduce or replace a dedicated pond where gravity drainage or space is limited
Project: Castle Road Self-Storage Complex, Waller, TX
Multi-building self-storage complex in Waller, Harris County
Drainage approval through Harris County
Read the full Castle Road case study
Challenges
An existing drainage channel ran through the middle of the site
The channel created dead zones between building rows
A traditional gravity detention pond would have taken rentable land
Objectives
Clear the interior of the site for storage buildings.
Shrink the detention pond footprint.
Maximize unit count across the full site width.
Solutions JRH Engineering Provided
Full site civil engineering: building layout, grading, paving and access
Rerouted the drainage channel to the property perimeter
Designed a pumped detention pond system in place of gravity detention pond storage
Coordinated utility, stormwater and well permitting
Results:
Interior site fully cleared for storage buildings
Smaller detention pond footprint and more rentable square footage
No sanitary sewer permit needed, since self-storage requires no sewer connection
Stormwater Rules in Texas, North Carolina and Florida
Texas
Houston-area requirements vary by city, county and drainage district.
Get a quick preliminary estimate with JRH's Detention Pond Calculator, then have a licensed Texas civil engineer confirm it.
On the 42-acre Parkside Trails subdivision in Alvin, a regional detention pond credit purchase replaced an on-site pond.
North Carolina
The NCDEQ Stormwater Design Manual covers 12 stormwater control measures, including wet ponds, dry ponds and infiltration systems.
Its design criteria match NC stormwater rules effective January 1, 2017.
JRH has no published North Carolina stormwater case study yet.
Florida
Florida stormwater permitting generally runs through the Environmental Resource Permit (ERP) program, with a strong focus on water quality (Florida DEP).
That focus is why retention ponds and treatment-based designs are common in Florida.
Frequently Asked Questions
What is the difference between a detention pond and a retention pond?
A detention pond temporarily holds and slowly releases stormwater, while a retention pond keeps a permanent pool for water quality.
When does an underground detention pond system make sense?
When surface space is limited, such as on commercial sites, parking lots and dense residential projects.
Can a pumped system reduce a detention pond footprint?
Yes, JRH Engineering used a pumped detention pond system on the Castle Road self-storage complex in Waller, TX.
Can I buy detention pond credit instead of building a pond?
In some areas, yes; the Parkside Trails subdivision in Alvin, TX used a regional detention pond credit purchase.
Does JRH Engineering have a detention pond calculator?
Yes, it gives preliminary Houston-area estimates that a licensed Texas civil engineer should review.
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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