Comparative Study of Hydraulic Design of Orifice Spillway between IS 6934:1973 & IS 6934 (Draft Code 2010)

Spillways, generally the ogee-crested type, are sometimes provided with a breast wall from various considerations. This spillway is widely used in Hydro power generation scheme. The hydraulic design of such spillway includes Profile of the spillway crest including the upstream and downstream quadrants, and Profile of the bottom surface of the breast wall. For the purpose of preliminary design, Bureau of Indian Standard had introduced IS 6934 in year 1973. The standard was then revised to incorporate the latest practices being followed in the field, the major changes being in dealing with ogee profile for spillway with breast wall. This research is an attempt to strike out the difference in the design between the IS 6934:1973 and Draft Indian standard (2010).For this purpose two Dams namely Nimoo Bazgo (Jammu & Kashmir) & Sewa II (Jammu & Kashmir), situated in India were examined and conclusions were then made.