The optimal head and flow rate for hydropower, are determined based on axiomatic and analytical considerations by Pelz in 2011. Due to ecologic and economic reasons it is necessary to optimize the relation of the gained energy to the edificial effort and impact on nature. Therefore machines have to be designed for optimal operating conditions consistent with the constitutional boundary conditions. Considering all this, the present paper gives a method for the design of type series for small hydropower, based on the axiomatic considerations of Pelz.

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