Professional drainage design and stormwater management engineering for residential, commercial, and development projects across Texas. From site grading to detention pond design, our licensed engineers ensure proper runoff conveyance and compliance with local drainage and floodplain requirements.
Check Your Texas Property Before You Build
Use ALFAP TX for a free preliminary check of flood information, the likely permitting authority, and possible engineering needs for your project.
Check My PropertyPreliminary guidance only. Confirm requirements with the applicable authority.
Deliverables that may be included
Specific deliverables depend on the agreed scope and the requirements of the reviewing jurisdiction. The list below shows work that may be included in a drainage design proposal.
Projects ALFA can help with
Drainage design may be needed for new construction, redevelopment, commercial site development, residential additions that increase impervious cover, subdivisions, and properties experiencing standing water, erosion, or runoff problems. ALFA's licensed civil engineers prepare drainage plans and stormwater calculations for projects across Texas, coordinated with the requirements of the reviewing jurisdiction.
Project steps
- 1Document & site review — ALFA reviews your survey, topographic information, proposed work, and any agency comments.
- 2Drainage analysis — existing and proposed runoff, detention needs, and conveyance are evaluated against the applicable criteria.
- 3Design — grading and drainage plans, detention or retention sizing, stormwater conveyance, and supporting calculations are prepared.
- 4Agency submittal & comments — ALFA coordinates the submittal and responds to reviewing-agency comments; the authority having jurisdiction makes the final permit decision.
Drainage and detention requirements are set by the permitting authority and depend on project conditions such as site size, impervious cover, downstream conveyance, and local drainage criteria. ALFA does not publish generic thresholds and does not guarantee permit approval. Requirements for your project are confirmed with the applicable jurisdiction.
Information needed for a quote
- Property address
- Proposed work or project description
- Survey or topographic information (if available)
- Agency or reviewer comments (if available)
Availability: Drainage design is available statewide. On-site visits, when needed, are scheduled based on project location.
How to Request a Proposal
Use the button below to request a proposal. Describe your project, site address, and any specific concerns or requirements.
Related Engineering Services
Detention Pond Design
Stormwater detention and retention basin design.
Grading & Drainage Plans
Site grading, earthwork, and drainage plan preparation.
Hydrology & Hydraulic Analysis
HEC-HMS and HEC-RAS modeling for drainage and flood studies.
Floodplain Engineering
FEMA LOMA/LOMR, no-rise studies, and floodplain compliance.
Related Services
Related Tools & Official Resources
Verify requirements with the official government sources before your project — these verified resources and plain-English answers apply directly to this service.