If the peak discharge of a storm water drain (S.W. Drain) is expected to exceed 150 cumecs, the free board to be provided, is_________________?

Related Mcqs:

1. If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is___________________?

   A. 2 hours
   B. 4 hours
   C. 6 hours
   D. 8 hours

2. For the open drain (N = 0.025) shown in the below figure, the discharge is________________?

   A. 26.88 cumecs
   B. 27.88 cumecs
   C. 28.88 cumecs
   D. 29.88 cumecs

3. Assertion A.: A free board of 0.3 m is provided above the top sewage line in septic tanks. Reason (R): It helps to accommodate the scum in the septic tank_________________?

   A. Both A and R is true and R is the correct explanation of A
   B. Both A and R is true but R is not a correct explanation of A
   C. A is true but R is false
   D. A is false but R is true

4. 15 cumecs, the depth d and width are related by For drains up to___________________?

   A. d = 0.2 B
   B. d = 0.5 B
   C. B = 0.2 d
   D. B = 0.5 d

5. The rational formula for peak drainage discharge, was evolved by_________________?

   A. Fruhling
   B. Lloyd David
   C. Kuichling
   D. All of these

6. A cylindrical ejector having its height 2 m fills after every 10 minutes with a peak sewage discharge of 0.0157 cumec. The diameter of the ejector chamber, is_____________________?

   A. 2.30 m
   B. 2.40 m
   C. 2.45 m
   D. 2.50 m

7. For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is________________?

   A. 10 cm
   B. 12 cm
   C. 15 cm
   D. 18 cm

8. The most effective arrangement for diverting excess storm water into a natural drainage, is____________________?

   A. Leaping weir
   B. Overflow weir
   C. Siphon spill way
   D. None of these

9. The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is_____________________?

   A. 0.05552 cumec
   B. 0.05554 cumec
   C. 0.05556 cumec
   D. 0.0556 cumec

10. If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is________________?

    A. 2 hours
    B. 3 hours
    C. 4 hours
    D. 5 hours