District of Columbia
Green Infrastructure and Rain Garden Design
Design of rain gardens, bioswales, permeable pavement and infiltration systems to meet stormwater rules or reduce runoff.
What the work involves
Green infrastructure manages runoff close to where it falls using infiltration and vegetation. Engineers check soil infiltration rates, size practices, design overflows and coordinate planting with landscape architects. Many municipal stormwater rules now prefer or require these practices, and some offer stormwater fee credits.
Local conditions we plan for
- Riverine flooding (Potomac and Anacostia) and urban stormwater
- Combined sewer infrastructure
- Dense urban sites with historic structures
- High groundwater near rivers
Building code: 2015 IBC/IRC listed as adopted district wide, as amended by the DC Construction Codes (ICC adoption chart, April 2026).
When you need it
- Stormwater rules require runoff reduction
- Stormwater utility fee credit program
- Limited space for a detention pond
- Homeowner wants to reduce yard runoff
Frequently asked questions
How much does green Infrastructure and Rain Garden Design cost?
Across the US, green Infrastructure and Rain Garden Design usually costs $1,500 to $25,000. Estimate. Residential rain gardens are at the low end; commercial permeable pavement and bioretention at the high end.
How long does green Infrastructure and Rain Garden Design take?
Plan on 2 to 8 weeks from signed proposal to stamped deliverables, longer if a site visit, soil testing or a permit review cycle is involved.
Do I need a licensed PE for green Infrastructure and Rain Garden Design?
In most US jurisdictions, yes. When the work needs a permit, the plans, calculations or report usually must be sealed by a Professional Engineer licensed in the state where the project is located. Every deliverable we issue for permit is sealed that way.
How do I verify an engineer's license in District of Columbia?
Engineers practicing in District of Columbia are licensed by the District of Columbia Board of Professional Engineers. You can confirm a license number and its status in the board's public license search before you sign a contract.
Which building code applies in District of Columbia?
2015 IBC/IRC listed as adopted district wide, as amended by the DC Construction Codes (ICC adoption chart, April 2026). Cities and counties can add local amendments, which is one reason to hire an engineer who works in your area.
What site problems do engineers see most in District of Columbia?
Common issues include riverine flooding (Potomac and Anacostia) and urban stormwater, combined sewer infrastructure, dense urban sites with historic structures and high groundwater near rivers.