Bissoy.com
Doctors Medicines MCQs Q&A

The downstream apron of the ogee spillway is found to have a negligible effect on the coefficient of discharge when the value of ________________

The downstream apron of the ogee spillway is found to have a negligible effect on the coefficient of discharge when the value of ________________ Correct Answer (Hd + d) / He exceeds 1.7

The d/s apron is found to have a negligible effect on the coefficient of discharge when the value of (Hd + d) / He exceeds 1.7. where d is the tailwater depth, Hd is the design head and He is the Design head including the velocity head. There can be a decrease in the coefficient due to tailwater submergence.

Related Questions

Statement (I): The ogee spillway is a control weir having an S-shaped crest profile which provides a high discharge coefficient without causing cavitations. Statement (II): The crest profile of ogee spillway conforms to the lower nappe of flow over a ventilated sharp-crested weir and ensures a constant discharge coefficient for all heads.
An ogee spillway of a concrete gravity dam having FRL of 328 m and MWL of 340 m is provided with vertical gates between piers erected on the spillway. The effective length of the spillway is 60 m. The discharge through the spillway when gates are opened up to the actual reservoir level of 331.0 m will be_____________
The discharge passing over an ogee spillway is given by (where, L is effective length of spillway crest and H is the total head over the spillway crest including velocity head.)
The W.E.S downstream profile of an ogee spillway can be represented by an equation: Xn = K Hd n-1. Y Where x and y are the coordinates of the points on the crest profile and K and n for a vertical upstream spillway would respectively be___________________
When the TWC lies below the JHC at all discharges, the problem can be solved by which of the following provisions? i. Constructing a sloping apron above the river bed ii. Provision of roller bucket type of energy dissipator iii. Provision of a ski-jump bucket iv. A sloping apron below the river bed v. Construction of a subsidiary dam vi. A sloping apron partly above and partly below the river bed
Two centrifugal pumps P and R are available for use in a pipe flow system and their head-discharge characteristics are as follows. Pump P Pump R Discharge (cumecs) Head (m) Discharge (cumecs) Head (m) 0 40 0 45 0.12 35 0.14 40 0.2 28 0.24 35 0.3 18 0.3 28   The following statements (S1, S2, and S3) pertain to the head and discharge values during actual operation. Neglect losses in the system. Which of the following statements are correct? S1: When the two pumps P and R are connected in parallel, the discharge is 0.36 cumecs corresponding to a head of 35 m. S2: When the two pumps P and R are connected in parallel, the discharge is 0.36 cumecs corresponding to a head of 70 m. S3: When the two pumps P and R are connected in series, the discharge is 0.3 cumecs corresponding to a head of 46 m.
The suction pressure on an ogee spillway is caused when the head on the spillway is:
When the gated sluices are provided through the body of the dam spillway then the ogee spillway structure shall normally be of Corbel type.
Coefficient of discharge of an ogee spillway
Consider the following measuring structures. A. Submerged broad-crested weir B. Free broad-crested weir C. Free sharp-crested weir D. Free ogee spillway Which is the correct sequence of the discharge coefficient of these structures in increasing order?