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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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Undermining Piping is to carry away wash soil particles with flowing water below the ground surface causing collapse or failure of the above structure. The scour continues until the energy of the flowing water reaches the normal channel energy. Determination of the uplift diagram. T he length of the seepage path transversed by the water is known as the length of creep percolation length.

Percolation is the flow of water under the ground surface due to an applied differential head. Classification of Weirs According to Geometrical Shape. Seepage or percolation below weirs on previous soils: Percolation length creep length is the length to dissipate the total hydraulic pressure on the structure.


Hydraulic Design determination of crest level and weir length according to head.

Determination of Percolation Length To determine the critical head: Reducing head on existing structures. For fayouk having steep slopes Regulators: Classification According to Position in Plan.

III — Detailed Drawings.

Design head H is the biggest of 12and 3. Water percolation length takes a short cut from a to b. Must cause minimum Loss in Head. Bligh supposed that the dissipation of head per unit length of creep is constant throughout the seepage path.

For proper Design of Water Structures: Flow wdirs Water in a Channel is controlled either by: Scour may be defined as deepening and widening of water channel under the influence of the flowing water with high velocities.

H n varies until H critical soil particles begin to move. Therefore we carry the 2nd experiment. Actual percolation length is smaller than designed.

Percolation length is the path length from a to b. For lands having mild slopes or flat lands. Of soil under water.


For lands having steep slopes. Classification According to Crest Length B.

Two weirs have to be constructed at the entrance of each canal. Ability weirrs fluid to move in the soil under certain head dimensions of velocity. Weirs for reducing water slope in steep lands. Lane suggested that a weight of three should be given to vertical creep and a weight of one to horizontal creep. Proper distribution of water carried by a main canal among the branch canals depending upon it.

Fayoum Weir Drawing • Topic •

Soil i cr F. I- Hydraulic Design of Weirs. Reducing the hydraulic slope gradient in a canal if canal water slope weors greater than the allowable water slope. Objectives of Wei rs in I rrigation Canals.

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Collecting sediments at US of structures sand strap. Structural Design Empirical Dimensioning — check of stability. Design of Weirs is divided to 3 parts: