Question

A fuse plug is a collapsible version of these structures that can increase their capacity. A grout curtain protects the foundations of these structures, where the auxiliary spillway may release flow in excess of the capacity (15[1])of the service spillway. (15[1])They’re not bridges, but the sides of these structures contain (15[1])abutments for support. (15[2])Newer (15[1])versions of these structures may contain a (*) fish ladder (10[1])to (10[1])allow migration (10[1])paths. (10[1])Unlike floodgates (10[1])or levees, these structures are primarily used to retain water. For 10 points, name these often massive barriers that can produce hydroelectric energy from the water they prevent from flowing. ■END■

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