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When a sewer line is dropped below the hydraulic gradient line to pass it through an obstruction, the arrangement is known as
The slope of a 1.0 m diameter concrete sewer laid at a slope of 1 in 1000, develops a velocity of 1 m/s, when flowing full. When it is flowing half-full, the velocity of flow through the sewer will be
In the design of storm sewers, “time of concentration” is relevant to determine the
The maximum flow occurs in an egg shaped sewer when the ratio of flow depth to vertical diameter is
Match List-I (Unit) with List-ll (Purpose) and select the correct answer using the codes given below the lists:
List-I
A. Leaping weir
B. Gutter inlet
C. Inverted syphon
D. Catch basin
List-II
1. To prevent grit, sand, debris, etc. from entering the storm sewer.
2. To carry the sewer below a stream or railway line
3. To drain rain water from roads to the storm sewer
4. To 'separate storm water and the sanitary sewage
Codes:
A B C D
(a) 4 3 1 2
(b) 4 3 2 1
(c) 3 4 2 1
(d) 3 4 1 2
A sewer is commonly designed to attain self- cleansing velocity at
If a sewer X is to be designed to generate equivalent self-cleansing action as in sewer Y, then