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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Hydraulic Design determination of crest level and weir length according to head. Design of Weirs is divided to 3 parts: Seepage or percolation below weirs on previous soils: Weirs for reducing water slope in steep lands.

Two weirs have to be constructed aeirs the entrance of each canal. Classification According to Position in Plan. For lands having steep slopes Regulators: I- Hydraulic Design of Weirs.

Proper distribution of water carried by a main canal among the branch canals depending fayou, it. Bligh supposed that the dissipation of head per unit length of creep is constant throughout the seepage path. 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 slope is greater than the allowable water slope.

H cayoum varies until H critical soil particles begin to move. Percolation length is the path length from a to b.

Fayoum Weir Drawing • Topic •

Classification According to Crest Length B. Soil i cr F. Actual percolation length is smaller than designed. For proper Design of Water Structures: Objectives of Wei rs in I rrigation Canals. Determination of the uplift diagram. Percolation is the flow of water under the ground surface due to an applied differential head. Lane suggested that a weight of three should be given to vertical creep and a weight of qeirs to horizontal creep.

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The scour continues until the energy of the flowing water reaches the normal channel energy. Must cause minimum Loss in Head. Percolation length creep length is the length to dissipate the total hydraulic pressure on the structure.


Ability of fluid to move in the soil under certain head dimensions of velocity. Determination of Percolation Length To determine the critical head: Water percolation length takes a short cut from a to b. III — Detailed Wfirs.

For lands having mild slopes or flat lands. Structural Design Empirical Dimensioning — check of stability.

Of soil under water. Classification of Weirs According to Geometrical Shape. Therefore we carry the 2nd experiment.

Design head H is the biggest of 12and 3. For lands having steep slopes. Reducing head on existing structures.

Flow of Water in a Channel is controlled either by: Collecting sediments at US of structures sand strap. T he length of the seepage path transversed by the water is known as the length of creep percolation length.

Scour may be defined as deepening and widening of water channel under the influence of the flowing water with high velocities.

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