Abstract: Rockfill gabions considered one of important self-spillway hydraulic structures, used as water distributor, regulator and other purposes. An experimental investigation was carried out to note the effect of the change of longitudinal slope and the change of rockfill size on the velocity at downstream side of gabion, all tests carried out under through flow regime type, the monosized of rockfill were used (-76, +64), (-64, +50) and (-50, +37.5) mm with three longitudinal slope 0, 0.014 and 0.028. Wooden frame meshed-side gabion with constant dimensions, 220 cm length of the bottom side 150 cm length of upper side of gabion, 0.3 m width and 0.35 m height. The result showed that the effective of discharge increasing on the value of velocity of downstream by increasing of rockfill size for same longitudinal slope and the effect of discharge decreasing on the velocity at downstream by increasing the longitudinal slope for the same rockfill size, a dimensional analysis concept used and non-linear regression by using IBM SPSS 21 program, to develop an empirical formula to estimate the velocity at downstream.
Marwah Abdullah Shlash, Hayder Sami Mohammed and Taghreed A.Musa, 2019. Determination of Coefficient of Transmissibility for Crushed Rocks. Journal of Engineering and Applied Sciences, 14: 1532-1537.