Question

1. The maximum Manning’s n for a smooth, clean, unlined, uniform earthen channel is about (based on MSMA):
   1. 0.012
   2. 0.025
   3. 0.033
   4. 0.002

2. The Manning’s n for a straight concrete-lined channel with off-form finished is about (average):
   1. 0.013
   2. 0.016
   3. 0.30
   4. 0.14

3. Water flows in a concrete-lined (n=0.013) rectangular channel of 3m wide at a flow depth of 1.2m and a slope of 0.00 Determine the discharge in the channel using Manning’s formula?
   1. 10.5 m³/s
   2. 11.6 m³/s
   3. 8.5 m³/s

4. In a wide rectangular channel, if the normal depth is increased by 20%, the discharge would increase by:
   1. 20%
   2. 15.5%
   3. 35.5%
   4. 41.3%

5. The normal depth in a wide channel carrying a unit discharge of 2m³/sec/m at of 10cm/km and Chezy Coefficient 60 (metric) is equal to
   1. 2.23m
   2. 2.07m
   3. 1.89m

Answer 1

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