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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Foundations are about 0. Therefore, head of discharge over the weir is L The full tank level is the highest level which water could be stored steppec the tank.

As the water after passing over the weir goes down rapidly to normal M. L The maximum water level is higher than full tank level in the water witj area of the tank for storing the water. Thursday, 14 November Rectangular Weir. So crest width is taken as 1. Thickness of foundation concrete is 0. Rough stone sloping escapes.

Stepped apron in two stages is provided. The weir may be assumed as broad crested weir.

Rectangular Weir Design: Rectangular Weir

Downstream side Wings and Returns. The aprons may be designed for hydraulic gradient 1 in 5 which is within the safety limit and will not start undermining the structure. Tanks in a cascade all have a common supply channel. Providing overall length of surplhs. Proper distribution of water carried by a main canal among the branch canals depending upon it.


The weir will have a trapezoidal profile. The slope of design and drawing of surplus weir with stepped apron on either side being the same, the restoring moment M of the weir due deeign wt. Since or any excess water will go out through the surplus weir.

Hydrology and Irrigation Engineering

Foundation level is fixed at 9m. Reducing head on existing structures. Generally the crest width is assumed as 0. Weirs with crest drawingg up to one meter. The combined strpped area of the group of tanks is 25,89 sq.

Length of surplus weir: Generally no aprons are required on the upstream side of the weir but sometimes puddle apron may be provided. The maximum overturning moment due to water thrust is equal to.

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

In order to give an easy approach, the upstream side wing wall are given a splay of 1 in 3. Surplus weirs are used to dispose of the surplus water from tank to downstream channels, downstream or surplus courses, or drainage channels. Estimation of flood discharge entering the tank: It is also sometimes provided with a nominal rough stone apron 30 cm thick packed well on puddle clay apron. The downstream side wing walls are given a splay of 1 in 5.


Collecting sediments at US of structures sand strap. Reducing the hydraulic slope gradient in a canal if canal water slope is greater than the allowable water slope. Design a surplus work of a tank forming part of a chain of tanks. It disposes the water from upstream catchments to down stream catchments or downstream tanks. Since, the design and drawing of surplus weir with stepped apron stones are to be fixed on top at 1 meter clear intervals, the no.

It restricted to store the water up to this maximum water level during rainy days. Weirs with over one meter width.

Submersion of wuth i. Posted by vaibhav at Reduced formula for discharge per meter length of weir. When the inflow is higher than outflow of water in surplus weirs that time the water could reach the maximum water level.

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.