The error in the discharge coefficient (including C,) of a rectangular profile weir, con- structed with reasonable care and skill, may be obtained from the equation. Weirs in the irrigation system of The Fayoum Governorate in Egypt have been modified: crests have been widened and pipes have been installed. As a result. Weirs in the irrigation system of The Fayoum Governorate in Egypt have been Hydraulic theory on flow over weirs and through pipes was subsequently used.

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Actual percolation length is smaller than designed. Classification of Weirs According to Geometrical Shape. Determination of Percolation Length To determine the critical head: For lands having steep slopes.

The scour continues until the energy of the flowing water reaches the normal channel energy. Bligh supposed that the dissipation of head fatoum unit length of creep is constant throughout the seepage path. Weirs for reducing water slope in steep lands.


Proper distribution of water carried by a main canal among the branch canals depending upon it.

Fayoum Weir Drawing • Topic •

T he length of the seepage path transversed by the water is known as the length of creep percolation length. Therefore we carry the 2nd experiment. Objectives of Wei rs in I rrigation Canals. Percolation fayom creep length is the length to dissipate the total hydraulic pressure on the structure. For lands having mild slopes or flat lands.

Two weirs have to be constructed at the entrance of each canal. Design of Weirs is divided to 3 parts: III — Detailed Drawings.

Structural Design Empirical Dimensioning — check of stability. Scour may be defined as deepening and widening of water channel under the influence of the flowing water with high velocities. Must cause minimum Loss in Head.

Undermining Piping is to carry away wash soil particles with flowing water below the ground surface causing collapse or failure of the above structure. Reducing the hydraulic slope gradient in a canal if canal water weirrs is greater than the allowable water slope.

Classification According to Crest Length B. Ability of fluid to move in the soil under certain head dimensions of velocity. Of soil under water. Water percolation length takes a short cut from a to b. For proper Design of Water Structures: Lane suggested that a weight of three should be given to vertical creep and a weight of one fayojm horizontal creep.


Flow of Water in a Channel is controlled either by: Design head H is the biggest of 12and 3. wejrs

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For lands having steep slopes Regulators: Collecting sediments at US of structures sand strap. Hydraulic Design determination of crest level and weir length according to head. Seepage or percolation below weirs on previous soils: Reducing head on existing structures. Percolation is the flow of water under the ground surface due to an applied differential head. Determination of the uplift diagram.

H n varies until H critical soil particles begin to move.