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قوس چاک دار
The simplest arrangement to affect spreading of the flow and dispersion is to construct the bucket with dispersion blocks in the portion downstream of the invert, in a fashion similar to that in a slotted bucket.
Slotted buckets, developed and first used on the 36 m high Angostura dam in 1945, is claimed to be an improvement over the solid bucket.
This design was so popular at that time that the USBR (1977) recommended that a solid bucket should not be used wherever the tail water limitations of the slotted bucket can be met.
Figure 1 shows comparison of hydraulic actions in solid and slotted buckets.
Figure 1 Hydraulic actions in solid and slotted buckets.
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