If D is the depth of scour below original bed, then the width of launching apron is generally taken as

Related MCQs

• When the full supply level (F.S.L.) of the canal is much below the bed level of the drainage trough, then the cross drainage provided is called syphon aqueduct.
• The maximum average depth due to one day storm over an area of 100 km2 is 100 mm. Depth-Area-Duration (DAD) curves indicate that for the same area of 100 km2 the maximum average depth for a 3 hour storm will be
• When the difference in weir crest and downstream river bed is limited into 3 metres, the weir, generally used is
• The width and length of mender as well as width of river, vary approximately with
• If the R.L's of canal bed level and high flood level of drainage are 212.0 m and 210.0 m respectively, then cross drainage work will be
• When the bed level of the canal is higher than the highest flood level (H.F.L.) of the drainage, then the cross drainage work is said to be
• The term balancing depth has the same meaning as the depth of water in canal.
• The ratio of average values of shear stresses produced on the bed and the banks of a channel due to flowing water is
• The bed of a canal is lowered in case of
• For a canal which irrigate the area directly, the fall should be provided at a location where the F.S.L. outstrips the gound level, but before the bed of the canal comes into filling.