Skip to main content

Types of rainwater harvesting

Short answer

Types include rooftop harvesting (collecting rain from roofs into storage tanks), surface runoff harvesting (collecting from open areas into ponds/reservoirs), and groundwater recharge using recharge pits, trenches, or wells filled with boulders, gravel and sand. Rooftop storage and recharge pits are most common for buildings.

Explain different types of rain water harvesting.

1. Rooftop rainwater harvesting (for storage)

Rain from roofs is collected through gutters and pipes and stored in tanks for use (domestic use, gardening). Suited to houses and apartments.

2. Surface runoff harvesting

Rain flowing over the ground (roads, open land, courtyards) is collected in ponds, tanks or reservoirs. Common in rural Nepal and in towns where open areas exist.

3. Groundwater recharge

Rain is led into the ground to raise the water table, by:

  • Recharge pits and trenches filled with boulders, gravel and sand.
  • Recharge (dug or bore) wells, through which filtered water goes to the aquifers.
  • Percolation ponds and gravel-filled recharge shafts.
  • Permeable pavements and kerb-side recharge.

4. Direct use vs recharge

Storage tanks give an immediate supply; recharge methods are used where space is limited, or where rainfall is seasonal and storage is uneconomical.

Rooftop storage and recharge pits are the two most common methods for buildings.

✓ Answer checked by Claude Opus 5.5 (high effort)

Related questions

All Building Technology chapter 12 questions →