SRL The Self-Reliance Library
C01.S1.N05

The Self-Reliance Library · Water Security

RAINWATER

Roof Catchment Field Guide

Collect roof runoff into covered storage for backup utility water.

Core rule: Keep it screened, covered, routed away from the foundation, and treat before drinking.

1 System Cutaway

roof gutter downspout screen covered barrel overflow away

Roof runoff moves through the gutter, passes through a screened inlet, fills covered storage, and exits through overflow.

2 First Flush + Screen

first dirty runoff first-flush drop screen cleaner water in

The first dirty runoff should be diverted or flushed away before cleaner water enters storage.

3 Use Ladder

Garden / washing / flushingCovered storage
Cleaner utility useScreen + filter
DrinkingFilter + disinfect first

Untreated roof water is backup utility water. Treat before drinking.

4 Do This / Avoid This

Do this

  • Screened inlet.
  • Covered barrel.
  • Overflow away.
  • Raised spigot.
  • Clean path.

Avoid this

  • Open barrel.
  • Mosquito access.
  • Overflow at foundation.
  • Drinking untreated.
  • Dirty roof runoff.

5 Build Steps

  1. Check roof and local rules.
  2. Clean gutter and downspout.
  3. Add first-flush path.
  4. Screen the inlet.
  1. Use covered storage.
  2. Add overflow away.
  3. Add spigot or outlet.
  4. Treat before drinking.