Turbine selection chart

Drag the point, click anywhere on the chart, or use arrow keys (Shift for larger steps). Diagonal guides are lines of constant electrical output at the efficiency set on the right. Envelopes are per machine — divide station discharge by the number of units before entering it.

Site duty

Net head m

Design flow m³/s — per unit

Overall efficiency %

Capacity factor %

Electrical output

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Matched runner types

Envelopes are indicative, compiled from ESHA small-hydro guidance and manufacturer application charts (Voith, Andritz, Ossberger). Ranges overlap deliberately — inside an overlap, final selection weighs specific speed, cavitation setting, part-flow duty, silt load and cost. P = ρgQHη with ρ = 1000 kg/m³. Pairs with the Hydel Energy hydropower calculator. v1.5