Waterfall Power Calculator
Power and annual energy from head × flow × efficiency — natural waterfall presets.
Every waterfall is an unbuilt powerhouse — this calculator says how big. 40 m of drop at 150 L/s is ~38 kW around the clock. The hard part isn't the math; it's the penstock route and the monsoon-to-March flow ratio.
Natural waterfall: every metre of head and every litre per second is power — 10 m × 100 L/s at 65% efficiency ≈ 6.4 kW, day and night. Hydro's magic is the availability: unlike solar's ~20%, a good stream runs 60–90% of the year.
Engineering estimate from published standards and typical equipment data. Site conditions, equipment datasheets and measured data govern the real result — confirm with a qualified engineer.
Use the free Waterfall Power Calculator online — Power and annual energy from head × flow × efficiency — natural waterfall presets. Runs instantly in your browser: no signup, no upload, mobile-friendly.
About Waterfall Power Calculator
Every waterfall is an unbuilt powerhouse — this calculator says how big. 40 m of drop at 150 L/s is ~38 kW around the clock. The hard part isn't the math; it's the penstock route and the monsoon-to-March flow ratio.
How to use Waterfall Power Calculator
- 1Enter net head and the dependable (dry-season) flow.
- 2Set system efficiency and a realistic availability factor.
- 3Read kW, annual kWh and the energy's value.
Why use Waterfall Power Calculator?
- ✓P = ρgQHη — transparent physics with site-class presets
- ✓Availability-weighted annual energy, not nameplate dreams
- ✓Dependable-flow guidance: dry-season numbers decide
- ✓Homes-powered framing for community projects
Frequently asked questions
How much power can my stream generate?+
P(kW) = 9.81 × flow(m³/s) × head(m) × efficiency. Ten metres of drop with 100 L/s at 65% efficiency makes ~6.4 kW — continuously, day and night. Hydro's edge over solar is the hours: 60–90% availability versus ~20% — small kW, huge kWh.
What's more important — head or flow?+
They multiply, but head is the better friend: high head means small water, small pipes, small turbines (cheap Pelton wheels), while low-head sites need big flows and big civil works per kW. The classic rule: find the drop first, then measure the water.
Which flow measurement should I use for design?+
The dependable dry-season flow — the stream's worst honest month — not the monsoon spectacle. Design flow above dependable flow buys capacity that idles most of the year. The flow-measurement tools on this site (bucket, float, weir) make the measurement a weekend job.
What does micro hydro cost compared to solar?+
Site-dependent: ₹1.5–4 lakh/kW installed for good micro sites (vs solar's ~₹0.5/kW) — but hydro's 3–4× capacity factor and 30+ year civil life flip the per-kWh economics at decent sites. Run this tool's annual kWh against solar's for your location and the comparison settles itself.
Embed Waterfall Power Calculator on your website
Want Waterfall Power Calculatoron your own site? Paste this snippet into any HTML page — it's free, with no API key or sign-up. The tool loads in an iframe and keeps working exactly as it does here.
<iframe src="https://tooljolt.com/tools/waterfall-power-calculator" width="100%" height="640" style="border:1px solid #e5e7eb;border-radius:12px;max-width:680px" title="Waterfall Power Calculator — ToolJolt" loading="lazy"></iframe>Related Energy tools
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