Flow-of-the-river potential is directly proportional to elevation above sea level and precipitation run-off. If a “sector” is the distance between two successive confinements—about 10 km—the linear potential of a river is given in the eq. (8.2)
Pf = 9.8xQmXH (8.2)
wherein H is the elevation difference, expressed in meters, above sea-level, between points of origin and exit of a sector, Qm the mean discharge, expressed in m3/s, at the end point of a section, and Pf the mean power expressed in kW. By summing the successive Pf values (EPf) a river’s “potential” can be calculated.
The theoretical energy (Ef) is given by (8.3):