Rainwater Harvesting Potential
Harvestable volume, tank sizing and recharge pit capacity.
Inputs
Results
Enter your values, then press Calculate Now to evaluate the output.
Guide — Rainwater Harvesting Potential
The rainwater harvesting calculator below follows standard Indian construction practice and the relevant IS-code conventions. Enter the site dimensions exactly as measured, press Calculate Now, then refine the quantities line by line in the live sheet before you export.
Harvestable volume is catchment area × rainfall depth × runoff coefficient. Use 0.85 for a clean RCC or tiled roof, 0.5–0.6 for paved courtyards and as low as 0.15 for unpaved ground.
Size the storage tank for the yield of one or two heavy months rather than the full annual volume — beyond that, the marginal tank capacity sits empty for most of the year.
Always fit a first-flush diverter to discard the initial 1–2 mm of rainfall carrying roof dust and bird droppings, followed by a filter before either the storage tank or the recharge pit.
Treat every output as an indicative pre-tender estimate. Site conditions, wastage allowances, specification changes and local market rates all move the final figure, so validate against your drawings and approved rate analysis before procurement.
Master Measurement Sheet
| Sr. No. | Description | Unit | NOS 1 | NOS 2 | L | B | D | QTY | Action |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 1.000 |
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About the Rainwater Harvesting Potential
This tool is built for site engineers, quantity surveyors, contractors and property investors who need dependable numbers fast. Every input is reactive — changing a single field instantly recomputes the full output set, so you can run sensitivity checks on dimensions, grades and rates before committing to an estimate.
Keep unit consistency in mind: metric inputs (metres, square metres, cubic metres) produce metric outputs, with imperial and Indian trade units shown alongside where they are commonly used on site.