# Hydrologic Modeling Engine

> Hydrologic modeling skill for rainfall-runoff analysis, flood frequency, and watershed analysis

- Skill: `a5c-ai/hydrologic-modeling-engine` (Agent Skill)
- Install (CLI): `npx skillmds@latest add a5c-ai/hydrologic-modeling-engine`
- Raw SKILL.md: https://api.skillmd.com/api/skills/a5c-ai/hydrologic-modeling-engine/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: a5c-ai (https://skillmd.com/u/a5c-ai)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/a5c-ai/hydrologic-modeling-engine

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# Hydrologic Modeling Engine Skill

## Purpose

The Hydrologic Modeling Engine Skill performs hydrologic analysis including rainfall-runoff modeling, flood frequency analysis, and watershed characterization using established methods.

## Capabilities

- Rational method calculations
- SCS/NRCS curve number method
- Unit hydrograph generation
- Reservoir routing
- Time of concentration calculation
- IDF curve analysis
- Flood frequency analysis
- Watershed delineation

## Usage Guidelines

### When to Use
- Estimating design flows
- Analyzing watersheds
- Designing stormwater facilities
- Evaluating flood risk

### Prerequisites
- Watershed characteristics known
- Rainfall data available
- Land use identified
- Soil types classified

### Best Practices
- Select appropriate method
- Validate with observed data
- Consider climate effects
- Document assumptions

## Process Integration

This skill integrates with:
- Stormwater Management Design
- Flood Analysis and Mitigation
- Hydraulic Structure Design

## Configuration

```yaml
hydrologic-modeling-engine:
  methods:
    - rational
    - scs-curve-number
    - unit-hydrograph
    - reservoir-routing
  outputs:
    - peak-flow
    - hydrograph
    - report
```

## Output Artifacts

- Peak flow calculations
- Hydrographs
- Watershed reports
- Routing analyses