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detention-pond-designer skill

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This skill designs detention and retention pond systems by calculating storage, sizing outlets, and creating stage-storage-discharge and routing analyses.

npx playbooks add skill a5c-ai/babysitter --skill detention-pond-designer

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SKILL.md

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---
name: detention-pond-designer
description: Detention/retention pond design skill for storage, outlet structures, and emergency spillways
allowed-tools:
  - Read
  - Write
  - Glob
  - Grep
  - Edit
  - Bash
metadata:
  specialization: civil-engineering
  domain: science
  category: Water Resources
  skill-id: CIV-SK-024
---

# Detention Pond Designer Skill

## Purpose

The Detention Pond Designer Skill designs stormwater detention and retention facilities including storage volumes, outlet structures, and emergency spillways.

## Capabilities

- Storage volume calculation
- Outlet structure sizing
- Stage-storage-discharge relationships
- Multi-stage outlet design
- Emergency spillway sizing
- Sediment storage calculation
- Water quality volume
- Routing analysis

## Usage Guidelines

### When to Use
- Designing detention basins
- Sizing outlet structures
- Meeting regulatory requirements
- Evaluating water quality treatment

### Prerequisites
- Inflow hydrographs available
- Release rate requirements known
- Site constraints identified
- Regulatory criteria established

### Best Practices
- Size for multiple storms
- Include freeboard
- Plan for maintenance access
- Consider downstream impacts

## Process Integration

This skill integrates with:
- Stormwater Management Design

## Configuration

```yaml
detention-pond-designer:
  design-types:
    - detention
    - retention
    - extended-detention
  outlets:
    - orifice
    - weir
    - riser
    - multi-stage
  routing:
    - modified-puls
    - storage-indication
```

## Output Artifacts

- Storage calculations
- Outlet sizing
- Stage-storage-discharge curves
- Routing summaries

Overview

This skill designs stormwater detention and retention facilities including storage volumes, outlet structures, and emergency spillways. It produces stage-storage-discharge relationships, sizes multi-stage outlets, and calculates sediment and water quality volumes. The outputs support regulatory submittals and site-level design decisions for detention, retention, and extended-detention basins.

How this skill works

Provide inflow hydrographs, release-rate targets, site constraints, and regulatory criteria. The skill computes storage requirements, develops stage-storage-discharge curves, sizes orifices/weirs/risers and multi-stage outlets, and performs routing (modified Puls or storage-indication). It also sizes emergency spillways and estimates sediment and water-quality storage.

When to use it

Designing new detention, retention, or extended-detention basins
Sizing outlet structures (orifice, weir, riser, multi-stage)
Evaluating performance against regulatory release-rate or volume criteria
Preparing stage-storage-discharge curves for hydraulic analysis
Developing emergency spillway capacity and freeboard checks

Best practices

Run analyses for multiple storm events and design storms relevant to the jurisdiction
Include freeboard and surcharge allowances for inflow uncertainty and debris
Provide maintenance access and sediment forebays in the layout
Assess downstream impacts and check routing under blocked orifice scenarios
Document assumptions, inflow hydrographs, and regulatory references in outputs

Example use cases

Calculate required storage and size a riser with an orifice outlet for a municipal detention basin
Produce stage-storage-discharge curves and routing summary for hydrologic modeling submittal
Design a multi-stage outlet to meet peak release limits while providing water-quality volume
Estimate emergency spillway dimensions and freeboard for a retention basin on a development site
Compute sediment storage and recommend forebay sizing for long-term maintenance planning

FAQ

What inputs are required to run a design?

You need inflow hydrographs (or design storm), target release rates, site topography/constraints, and applicable regulatory criteria.

Which routing methods are supported?

The skill supports modified Puls routing and storage-indication routing for stage-storage-discharge based analyses.