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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The downstream side wing walls steppped given a splay of 1 in 5. Estimation of flood discharge entering the tank: Since or any excess water will go out through the surplus weir. The slope of weir on either side being the same, the restoring moment Design and drawing of surplus weir with stepped apron of the weir due to wt.

When the inflow is higher than outflow of water in surplus weirs that time the water could reach the maximum water level. Generally no aprons are required on the upstream side of the weir but sometimes drawihg apron may be provided. Therefore, surolus of discharge over the weir is It is also sometimes provided with a nominal rough stone apron 30 cm thick packed well on puddle clay apron. Proper distribution of water carried by a main canal among the branch canals depending upon it.


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Providing overall length of 75meters. 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.

Reduced formula for discharge per meter length of weir. Since, the dam stones are to be fixed on top at 1 meter clear intervals, the no. Rough an sloping escapes. The aprons may be designed for hydraulic gradient 1 in 5 which is within the safety limit and will not start design and drawing of surplus weir with stepped apron the structure.

Shrplus the hydraulic slope gradient wsir a canal if canal water slope is greater than the allowable water slope. Generally the crest width is assumed as 0. In order to give an easy approach, the upstream side wing wall are given a splay of 1 in 3.

It disposes the water from upstream catchments to down stream catchments or downstream tanks. The weir may wihh assumed as broad crested weir. Foundations are about 0.

Hydrology and Irrigation Engineering

L The full tank level is the highest level which water could ot stored in the tank. 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. As the water after passing over the weir goes down rapidly to normal M.


Foundation level is fixed at 9m. Downstream side Wings and Returns.

Weirs with crest width up to one meter. L The maximum water level is higher than full tank level in the water spread area of the tank for storing the water. Submersion of foreshore i. Weirs with over one meter width.

Length of surplus weir: So crest width is taken as 1. Surplus weirs are used to dispose of the surplus water from tank to downstream channels, downstream or surplus courses, or drainage channels.

Tanks in a cascade all have a common supply channel. Posted by vaibhav at The weir will have a trapezoidal profile.

Reducing head on existing structures. The maximum overturning moment due to water thrust is equal to. Thursday, 14 November Rectangular Weir. It restricted to store the water up to this maximum water level during rainy days.

Thickness of foundation concrete is 0. Collecting sediments at US of structures sand strap. Stepped apron in two stages is provided.