Diversion Headworks - 3686 Words

MODULE III DIVERSION HEAD WORKS A hydraulic structure which supplies water to the off taking canal is called a head work. Head works are of two types. 1.Storage head works 2.Diversion head works. 1.Storage head works. It stores water during the period of excess supplies in the river and releases it when demand overtakes available supplies. 1.Diversion head works It serves to divert the required supply in to the canal from the river. A diversion head works serves the following purposes. 1. It raises the water level in the river so that commanded area can be increased. 2. It regulates the intake of water in to the canal. 3. It controls the silt entry in to the canal. 4. It reduces fluctuations in the level of†¦show more content†¦The safety against undermining cannot simply be obtained by considering a flat average gradient but by keeping this gradient well below critical. 4. Bligh makes no distinction between outer and inner faces of sheet piles or the intermediate sheet pile where as according to investigation the outer faces end sheet piles are much more effective than ones. 5. Loss of head does not take place in the same proportion as creep length. Also the uplift pressure distribution is not linear but follows as sine curve. 6. Bligh does not specify the absolute necessity of providing a sheet pile at D/S end whereas it is absolutely essential to have a deep vertical cut off at D/S end to prevent undermining. DESIGN OF VERTICAL DROP WEIR The complete design of vertical drop weir consists of the design calculations for the following. 1. Hydraulic calculations for fixing various elevations. 2. Design of weir well. 3. Design of impervious apron. 4. Design of inverted filter and D/S talus. 1. Hydraulic calculations. Before starting the design calculations the following data must be known. Maximum flood discharge. H.F.L. before construction of weir. D/S bed level. F.S.L. of canal taking off from the river. Allowable afflux. Lacey’s silt factor f. 1. The length of water way (L) is calculated from Lacey’s regime formula L = 4.75 Q 1/2 ---------------------------- (1) Where L = Length of water way in meters. Q =Show MoreRelatedConstruction Process For A Water Irrigation System Essay1201 Words   |  5 Pagesconsiderable energy, corrugated steel pipes offer energy-dissipating advantages. On flat terrains, energy loss through a culvert is undesirable; hence, concrete pipes are more appropriate (Simon, 1997) 2.2.2 Canal At the diversion structure, a headwork controls the flow into a canal. Main canal is the canal that gathers water supplies from the river and usually direct irrigation from the waters of this canal is not carried out (Kharagpur, 2008). This acts as a feeder channel to the branchRead MoreWater as a Source of Future Conflict in Sa26984 Words   |  108 Pageshundred are killed before cease-fire was declared. (e) March 1965 - July 1966. Syria and Israel had exchanged fire over all-Arab plan to pass on the headwaters of the Jordan River, most possibly to prevent Israeli national water carrier, a diversion plan that was out-of-basin from the Sea of Galilee. (f) April - August 1975. A low-flow year next to the Euphrates, as upstream dams were being filled, the Iraqis claimed that the stream reaching its territory was unbearable, and requested