To provide a power recovery hydroelectric system capable of improving power generation efficiency in a sewerage facility by directly introducing sewage water pumped from a manhole pump of a manhole pump station into a generator at a place of discharge.

The present invention improves power generation efficiency by directly introducing hydraulic pressure of sewage water into a hydraulic turbine 23 when sewage water pumped from a manhole pump of a manhole pump station at an upstream side is discharged through a force feed pipe outlet 8. Upper drawings illustrate one state where a whole system is installed in one manhole. Lower drawings illustrate other state where a generator is separately installed in a new manhole additionally provided beside an existing manhole in the case that one manhole cannot install the whole system. In the other state, a narrow slit screen 20, a screen residue breaker 21, and the hydraulic turbine 23 are installed in the existing manhole and the generator 16 is installed in the new manhole. Rotational power of the wind mill type hydraulic turbine 23 is transferred to the hydraulic generator 16 through a generator drive axis 15 and the hydraulic generator 16 generates power.