18 Dec design of surplus weir design and drawing of irrigation structures when flood dischrge is known. 14 Nov Surplus weirs are used to dispose of the surplus water from tank to downstream Ø Design of weir. Type D: weir with stepped aprons. Irrigation Design –Drawing. Design and Drawing with all the three views of: Surplus weir with stepped apron; Tank sluice with tower head; Notch type canal drop.

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Reduced formula for discharge per meter wiyh of weir. When the inflow is higher than outflow of water in surplus weirs that time the water could reach the maximum water level.

Foundation level is fixed at 9m. Since or any excess water will go out through the surplus weir. Estimation of flood discharge entering the tank: The weir may be assumed as broad crested weir.

Hydrology and Irrigation Engineering | H K E Society’s SLN college of Engineering, Raichur

Generally no aprons are required on the upstream side of the weir but sometimes puddle apron may be provided. The slope of weir on either side being the same, the restoring moment M of the weir due to wt.

Submersion of foreshore i. The maximum overturning moment due to water thrust is equal to.

Reducing the hydraulic slope gradient in a canal if canal water slope is greater than the allowable water slope. Thursday, 14 Surplks Rectangular Weir. The downstream side wing walls are given a splay of 1 in 5. As the water after passing over the weir goes down rapidly to normal M.

Generally the crest width is assumed as 0. Proper distribution of water carried by a main canal among the branch canals depending upon it. The weir will have a trapezoidal profile. Collecting sediments at US of structures sand strap.

Hydrology and Irrigation Engineering

It restricted to store the water up to this maximum water level during rainy days. It disposes the water from upstream catchments to down stream catchments or downstream tanks. Rough stone sloping escapes. Design and drawing of surplus weir with stepped apron weirs are used to dispose of the surplus water from tank to downstream channels, downstream or surplus courses, or drainage channels.

Reducing head on existing structures. Length of surplus weir: The aprons may be designed for hydraulic gradient 1 in 5 which is within the safety limit and will not start undermining the structure. Providing overall length of 75meters. L The full tank level is the highest level which water could be stored in the tank.

Rectangular Weir Design: Rectangular Weir

It is also sometimes provided with a nominal rough stone apron 30 cm thick packed well on puddle clay apron. So crest width is taken as 1. The combined catchment area of the group of tanks is 25,89 sq. Design a surplus work of a tank forming part of a chain of tanks. Weirs with over one meter width.

Thickness of foundation concrete is 0. Stepped apron in two stages is provided. Foundations are about 0.

Tanks in a cascade all have a common supply channel. Since, the dam stones are to be fixed on top at 1 meter clear intervals, the no. Therefore, head of discharge over the weir is Weirs with crest width up to one meter. Since, temporary regulating arrangements are to be made on top of the weir, to store water at times of necessity, grooved dam stones 15cms x 15 cms, will be fixed in the centre of the crest at one meter interval with top at MWL.

In order to give an easy approach, the upstream side wing wall are given a splay of 1 in 3. L The maximum water level is design and drawing of surplus weir with stepped apron than full tank level in the water spread area of the tank for storing the water. Posted by vaibhav at Downstream side Wings and Returns.