Page - 1547 - in Book of Full Papers - Symposium Hydro Engineering

Closing of river diversion: For diversion tunnels, it is necessary to close the flow through diversion tunnel to start filling the dam or divert the tributary flow through definitive structures that are completed. The temporary diversion closure can be permanent or temporary (Pinheiro, 2002). In temporary closure, it is common to use a gate. For permanent closing it is implanted a concrete plug inside the diversion structure. The planned temporary diversion closure must be programmed according to a study of local flow conditions and the closing of the river coincide with the dry season. The type of diversion structure influences naturally provisional closing. In the case of the structure consist of two diversion tunnels it is possible to make the closing of one of the tunnels continuing the flow to be diverted by other tunnel (ICOLD, 1986)[5]. REFERENCES [1] BIS 4880 (Part III, Hydraulic design)-2000, Code of practice for design of tunnels conveying water. [2] Balkrishna Shankar Chavan (2017), Unified Equation for Estimation of Friction Factor, Proceedings of 37th IAHR World Congress, Aug13-18, held at Kuala Lumpur, Malaysia Pages 5885-5893 [3] Bureau of Reclamation (BUREC) 1987, Design of Small Dams, 3rd edition, Bureau of Reclamation, Water Resources Technical Publication, Denver. [4] EM 1110-2-2901, A Tunnels and Shafts in Rock Bureau of Reclamation, Water Resources Technical Publication, Denver [5] ICOLD. 1986. River Control during Dam Construction, bulletin 48a, Paris. Manzanares, A.A. 1980. [6] MMRDA, MCGM, (2006) Development plan for Greater Mumbai. 1547