Hydro Power Workshop WS of the Sector Network

Hydro Power Workshop (WS) of the Sector Network Energy Sub. Sahara Africa and En. Dev Challenges GTZ-ECO –Access to Modern Energy –Electricity(AMES-E/ HYDRO Stone Breaking Background In the endeavor to provide access to During laying of the penstock in Ererte electrical energy to the rural dwellers MHP, we encounter a hard basaltic rock in Ethiopia, GTZ-ECO, AMES- E/HYDRO intends to contribute to that can not easily excavate. Then using the community participation, some experienced labours, and using the locally the development of the hydropower available materials such as burning an old sector in the country by developing car tyre an 11 m and a depth of 37 cm pilot sites to generate electricity for basaltic rock is excavated lighting and other productive uses in the different regions of the country. Some common challenges and remedial action taken is listed below. Land Sliding Piping In Hagra-Sodicha the washed away of the The Erete MHP canal around the intake left bank of the canal was happed due to is situated near to the river. During the not installing the intake gate on time. The rainy season, the water is coming under last 30 m of the canal was not excavated at the canal foundation and it creates piping. the time when the river water is coming The main reason for this case is through the intake gate. The water couldn’t shallow foundation of canal. The action get a way to flow towards the downstream taken is to providing retaining wall that direction. Then it breaches the left bank of increases seepage length. due the canal. The remedial action taken is backfilling (520 cubic meter) of soil and plantation. Deep Excavation Retaining wall In the Hagra –Sodicha MHP the forbay Due to rolling stone from up hill 3. 92 cubic area is situated in the hilly area. It needs meter of masonry retaining wall is broken an excavation of 750 cubic meter to get down. the required forbay and canal elevation. Theis retaining wall protects the power In this site the community participation is house from hitting by the rolling stone. remarkable.