21. "' Tekez?Dam "'is a double-curvature arch dam in the northern Tigray region of Ethiopia. 22. The Mongols also built arch dams in modern-day Iran. 23. The dam is an early arch dam constructed by the outlet system for its time. 24. In 2013, China completed an arch dam , Jinping 1 Dam, which is world's tallest at. 25. Two types of single-arch dams are in use, namely the constant-angle and the constant-radius dam. 26. In the arch dam , stability is obtained by a combination of arch and gravity action. 27. The "'Shapai Dam "'is an arch dam on the Caopo River in Sichuan Province, China. 28. Arch dam designs would continue to test new limits and designs such as the double-and multiple-curve.29. An "'arch dam "'is a solid dam made of concrete that is curved upstream in plan. 30. The structure is the world's largest multiple-arch dam .
