Author(s): Er. SV Baria, Dr. ML Gaur, NS Damor and RM Satasiya

Abstract: The flow over a drop-inlet spillway has a complex nature, and its characteristics are remarkably different from other spillways. This study conducts experimental investigations and numerical simulations on the flow behaviour of water in drop-inlet spillways. The drop-inlet spillway is the most effective hydraulic structure for dissipating energy downstream of the spillway crest. This work evaluates the hydrologic and hydraulic functioning of a prototype hydraulic structure as used in natural channels of small agricultural watersheds, by generating some of the basic information & other relevant parameters for the area under study. The overall values of key flow parameters (h, v, E, n, Fr, Re) have been suitably worked out and analysed, which altogether gave a broad range under hydraulic structures with varied configurations in regards to discharges and the channel bed slopes. Physical model study plays a vital role in the planning and designing of hydraulic structures. A vast review was done on updated progress on the hydraulic structure and their relevant monitoring and evaluations in hydraulic flume as well as real channel flow conditions. The avenged values of v under low discharge conditions remains 0.192 m/s, moreover when the channel bed slope enhanced form 0.5 to 2% it enhanced to 0.317 m/s. Under high discharge conditions it was found to 0.534 to 0.682 m/s. Efforts are made to derive the real limits of flow conditions all along the channel with in-depth evaluations of flow parameters, flow regimes, and all associated flow conditions. Also, the values of Cd for specific Drop inlet spillway hydraulic structures are attempted here with an effort to further extend its applicability to similar ungauged situations. The Cd values for the drop inlet spillway were found the be in the range of 0.004 to 0.107 and alternate predictive equations in this regard too also synthesized in this study.

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