Dam and Canal gates


Canal Gates or Canal Protection Gates are structures that were installed on canals specifically to reduce or prevent flood damage to dwellings, factories, etc. in the event of aqueducts, canal banks, etc. being breached either through natural events or by enemy action during wars, insurgency, sabotage, etc. They sometimes have a secondary function in regard of canal maintenance work. Substantial structures or simple 'Stop Gates' or 'Stop Planks' were used to prevent flooding and were usually only put in place when air raid warnings were given.
Almost every water resources project has a reservoir or diversion work for the control of floods or to store water for irrigation or power generation, domestic or industrial water supply. A spillway with control mechanism is almost invariably provided for release of waters during excess flood inflows. Releases of water may also be carried out by control devices provided in conduits in the body of the dam and tunnels. In order to achieve flow control, a gate or a shutter is provided in which a leaf or a closure member is placed across the waterway from an external position to control the flow of water. Control of flow in closed pipes such as pen stocks conveying water for hydro power is also done by valves, which are different from gates in the sense that they come together with the driving equipment, whereas gates require a separate drive or hoisting equipment.Different types of hydraulic gates and hoists, working on different principles and mechanism are in use for controlled release of water through spillways, sluices, intakes,regulators, ducts, tunnels, etc. Right selection of gates and their hoisting arrangement is very important to ensure safety of the structure and effective control. A designer has to plan a gate and its hoisting arrangement together. Separate planning of gates or hoists,sometimes results in unsatisfactory installation. Though the choice for the gates and hoists depends on several factors, primarily safety, ease in operation as well as maintenance and economy are the governing requirements in the same order. It is essential for the water resources engineer to be aware of the different factors, which would largely affect the choice of gates and hoists and would help in selection of the same. In this lesson, an introduction is provided on different gates, specific purposes for which they may be used, possible locations in which to install, and suitable hoists with which to operate. A brief outline is also provided on the common types valves used to regulate flow in pen stocks.
Large volumes of stored water have considerable destructive potential and where structures such as canals run on embankments above low lying built up areas or where aqueducts exist, appropriate safety precautions were taken either as a war time contingency or at the time of construction. These Canal Gates or Canal Air Raid Protection Gates (ARPG) were constructed and installed in regard to the scale of the danger posed and ranged from simple wooden planks known as 'Stop Gates' or 'Stop Planks' to more massive constructions built of concrete and steel such as the safety gates

Specification of canal gate-

Canal gates are manufactured and erected by us with all IS Material according to Design and Drawings at Site or Workshop at the time of Fabrication and Tests shall be Carried out by our Quality Control Lab and Relevant Equipments.