Canal Head Regulator Assignment Help
Construction in the head of canal taking off from a reservoir may contain number of spans controlled by gates and separated by piers.
Regulators are normally aligned at 90degree to theweirupto 10″ are considered preferable
for smooth entry into canal. These are used for diversion of flow. Silt reduces carriage capacity of flow.
- Still pond regulation:
- Open flow regulation
Still Pond Regulation:
Water is drawn by canal from still pond.
Water in excess of canal requirements is not permitted to escape below the clean gates. Rate of water in the pocket is very much reduced; silt is deposited in the pocket
Flow Open regulation
Sluice gates are opened and let excess of the canal necessity
For scouring the silt canal is not shut
Entrance of silt to canal may be controlled by:
Providing a divide wall
Develop pocket or a trap
Create scouring capacity of under sluices
By concentrating the currents towards them
Paving the underside due to disturbance sediment remains in suspension the approach channel to reduce disturbance
Making entry of topclear water by:
Supplying lifted silt in the canal
Lower silt degree of scouring sluices
Wide head regulator reduces velocity of water at intake
Smooth entrance to prevent unsteady flow
Handling careful weir’s regulation
Designed the bottom and top layers of flow are separated with the least potential disturbance
The tunnel near the head regulator being of same length as that of the width of head regulator tunnel of different length
Ability of tunnel is all about 20% of canal discharge
Minimal rate is 2 to 3m/s to avert deposit in tunnel is kept the same as sill degree of head regulator
From scouring and discharge rate, the complete waterway required for under water tunnels may be discovered
Silt ejector or extractor:
System by which the silt, thrown out or after it is entered the canal is taken out.
Constructed on the canal some space
There ought to be no disturbance of flow at the entrance.
Sediment – laden are diverted by curved vanes
The streamlined vane passageway quicken the flow through them, hence averting deposit decreasing the velocity flow is increased by section area
The tunnel discharge by gate in the outlet end
A suitably designed regulator at the head of a canal is offered to control silt entrance into the canal as well as to regulate the supplies entering the canal. The setting of alignment of the head regulator particularly in case of distributors canals vis-a-vis the alignment of the branch canal or a sub distributor from a distributors canal as the case may be needs to be given special attention.
Notwithstanding the fact that head regulator in the rehabilitation process’ design is confined to branch canals taking off from main canal or the distributor canal heads. Designs both structural and hydraulic including the gate and hoist attributes of the existing head regulators are of interest regarding the job region. Location special details shall have to be decided on the basis of other relevant standards / references. The following process shall be adopted for design / redesign of head regulators.
During the course of redesign of the project region canal system, it was seen the existing arrangement of the left side U/S return wing of the head regulator of Haidergarh branch and right U/S return wing of Dih distributary are causing adverse flow conditions resulting in varied discharge intake through the different bays of the head regulator. The Department of WRD&M, IIT Roorkee undertook model studies suggest modifications and to check the flow states. Predicated on the observations in the model, it has been seen that the U/S left return wing wall of Haidergarh division in its present geometric configuration is causing variable flow velocities across the width of the regulator through the various bays and excessive siltation is brought towards the first two bays from the left side.
Also the head regulator with its current five bays of 8 meters clear opening is insufficient to drive the plan release into the division canal. The model study has shown that 145.0 cumec stream can pass the head regulator under the present running parameters. A modified geometry of the wing was proposed silt distribution of the head regulators and to ensure almost uniform flow. The outcomes of findings along with the details of model studies are presented.
Minor canal heads are designed as open flume. This sort of intake for minor canal is the most widely adopted layout. The setting of the crest is at least 0.1 times of the complete supply depth of parent canal above bed. The crest is also above the degree of d/s canal bed of the away taking minor. No control work is generally needed in the parent canal includingpaving of the bed section opposite the intake.
Canal Head sluices or Head Regulator
A construction is assembled in the head of the canal to modulate flow of water. Itbreaks up the complete width of the canal into several spans known as bays. The piers contain amount grades on which the flexible gates are placed. The gates are controlled form the top by appropriate mechanical device. A platform is offered on the top of the piers of using the gates for the facility. Again some piers are built on the downstream side of the canal head to support the roadway.
Functions of Canal Head Regulator:
- It modulates the supply of water entering the canal
- It controls the entrance of silt in the canal
- It prevents the river-floods from going into the canal
The water from the under-sluice pocket is made to enter the regulator bays in order to pass the full supply discharge into the canal. The maximum height of these gated openings, named head sluices will probably be equal to the difference of Pond Level and Crest Level of the regulator.
If a silt-excluder is supplied, the regulator crest is further lifted by about 0.6 to 0.7 meter.
The deposited silt is easily scoured outside occasionally and removed through the under-sluice openings.