- 35 An Overflow Masonry Dam Is To Be Constructed Across A Stream The Stream Is Estimated To Have A Maximum Flood Discha 1 (94.16 KiB) Viewed 19 times
35. An overflow masonry dam is to be constructed across a stream. The stream is estimated to have a maximum flood discharge of 850 m3/s when the elevation of the water sur- face is 345 m at the dam site. Six sluice gates each 2.5 m high and 2 m wide are to be constructed in the dam with their sills at elevation 342 m. The main overflow weir for which C = 1.45 will be 60 m long with a crest elevation at 360 m. An auxillary weir 180 m long with a crest elevation at 361 m will operate during floods. For this weir C = 1.88. With all the sluice gates open, what will be the surface eleva- tion upstream of the dam when the discharge is 850 m3/s? =