---
title: "Benefits of rainwater harvesting"
subject: "Building Technology"
chapter: 12
key: "semester_6/building_technology:rwh-benefits"
source: https://www.bctengineer.com/q/semester_6/building_technology/rwh-benefits
site: BCT Engineering
---

# Benefits of rainwater harvesting

Building Technology · Chapter 12: Other services in building

- Asked in: 2081 Chaitra, 1 marks
- Video: [💧 Why is a Rainwater Harvesting System Important?](https://www.youtube.com/watch?v=drvvLyx1LvQ) — NEOTEQUE  Design and Trade
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_6/building_technology/rwh-benefits
- Whole chapter: https://www.bctengineer.com/md/semester_6/building_technology/chapter-12

## Question

What are the benefits of rainwater harvesting?

## Short answer

Rainwater harvesting supplements water supply, reduces dependence on piped/tanker water, recharges groundwater, lowers stormwater runoff and urban flooding, provides soft, low-salt water for washing and gardening, and is simple and cheap to install and maintain. It saves water and energy costs.

## Answer

- Supplements the water supply, reduces dependence on piped supply and tanker water, and cuts water bills.
- Recharges groundwater and raises the water table.
- Reduces storm runoff, urban flooding and soil erosion.
- Rainwater is soft and low in salts, so it is good for washing and gardening and, after treatment, for drinking.
- Simple, cheap and easy to maintain; can be used anywhere.

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. RWH benefit for groundwater:
   A. Recharges it and raises water table
   B. Lowers it
   C. No effect
   D. Contaminates it
   Answer: A. Recharge pits and wells. (Key point: Groundwater)

2. RWH reduces:
   A. Storm runoff, urban flooding and erosion
   B. Rainfall
   C. Roof area
   D. Soil permeability
   Answer: A. Less runoff. (Key point: Flooding)

3. Rain water is:
   A. Hard and salty
   B. Soft and low in salts
   C. Always contaminated
   D. Fluoride-rich
   Answer: B. Good for washing, gardening, treated drinking. (Key point: Water quality)

## Related in Building Technology

- [Short note: Rainwater harvesting](https://www.bctengineer.com/question.md?key=semester_6%2Fbuilding_technology%3Arainwater-harvesting-note) — Building Technology, chapter 12, asked 5×
- [Rainwater harvesting and its treatment](https://www.bctengineer.com/question.md?key=semester_6%2Fbuilding_technology%3Arwh-treatment) — Building Technology, chapter 12, asked 3×
- [Components of rainwater harvesting](https://www.bctengineer.com/question.md?key=semester_6%2Fbuilding_technology%3Arwh-components) — Building Technology, chapter 12, asked 2×
- [Types of rainwater harvesting](https://www.bctengineer.com/question.md?key=semester_6%2Fbuilding_technology%3Arwh-types) — Building Technology, chapter 12