Stormwater Compliance & Design Analyzer
Analyze stormwater designs against regulatory requirements and size detention basins
What You Can Do
Verify stormwater designs against MS4 permits, local ordinances, and environmental standards in minutes rather than hours. Calculate detention basin volumes using SCS and rational methods, evaluate water quality treatment requirements, and identify specific design deficiencies with actionable recommendations. Generate technical justifications for variance requests and produce compliance documentation ready for regulatory submission.
Features
Cross-references proposed designs against federal, state, and local stormwater ordinances and MS4 permit requirements
Applies SCS and rational methods to compute required detention volumes for multiple storm events (2-yr, 10-yr, 25-yr, 100-yr)
Evaluates BMP selection and pollutant removal requirements based on jurisdictional standards
Flags design deficiencies with specific regulatory citations and remediation pathways
Analyzes permanent stormwater management features for long-term performance and maintenance requirements
Evaluates multiple design scenarios against the same regulatory framework to support value engineering
Develops technical rationale for requested design waivers or non-standard approaches
Computes runoff volumes and discharge rates across multiple design storms
Example Output
Example 1: Detention Basin Compliance Check
Project: 8-acre commercial development in King County, WA
- 2-yr storm volume required: 2.1 acre-feet (per local ordinance)
- Proposed detention basin: 2.3 acre-feet
- ✅ Compliant — Exceeds minimum by 9.5%
- Water quality treatment: Bioretention filter recommended
- MS4 permit alignment: Meets flow control standard of 0.05 cfs/acre
Example 2: Compliance Gap Report
Project: Mixed-use redevelopment in Harris County, TX
- ❌ Gap #1: Proposed basin lacks redundant outlet structure (Harris County Flood Control requirement)
- ❌ Gap #2: Water quality treatment BMP not sized per TCEQ standards for parking lot runoff
- ✅ Recommendation: Add secondary weir outlet; incorporate 0.5-inch treatment depth in sediment forebay
- Timeline to compliance: Design modification required before permitting
Example 3: Alternative Comparison
Alternative A (surface detention): 3.1 acre-feet, 2.2% site coverage Alternative B (subsurface infiltration): 1.8 acre-feet, 0% visible footprint
- Both meet 25-yr storm volume requirement (2.0 acre-feet)
- Alternative B superior for dense urban context; requires infiltration test approval
- Cost implications and maintenance burden documented for selection decision
What's Included
- SKILL.md instruction file with regulatory framework mapping:
- Detention basin sizing calculator (SCS, rational method, multiple storm events):
- Regulatory requirement checklist template (federal, state, local tiers):
- Water quality BMP selection and sizing worksheet:
- Compliance gap report template with remediation tracking:
- Design alternative comparison matrix:
- Variance justification outline with citation library:
Who It's For
- Environmental Engineers — Site-level stormwater design and regulatory compliance verification
- Civil Design Professionals — Stormwater system layout and detention basin sizing for development projects
- Permitting Specialists — Pre-submission compliance review and gap analysis before agency submittal
- Project Managers — Cost and schedule impact assessment of design alternatives and compliance pathways
- Water Resources Consultants — Technical support for complex stormwater designs and regulatory negotiations
Best For
- New development and redevelopment stormwater management design reviews
- Detention and retention basin sizing calculations across multiple storm events
- Regulatory compliance verification against MS4 permits and local ordinances
- Design alternative evaluation for value engineering and site optimization
- Variance request justification and technical documentation for regulatory agencies
- Post-construction BMP assessment and long-term performance evaluation
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