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Question
In a design of storm sewers, if the time taken by  rain-water to flow from the farthest point of the watershed to the sewer inlet is 'ti' and the time of flow of water from the sewer inlet to the point in the sewer that is under consideration is 'tf', then the time of concentration will be
A.
ti
B.
tf
C.
ti + tf
D.
ti  or  tf whichever is greater
Answer ( Option C)

ti + tf

Solution

Time of concentration (tc) is the time required for the rain water to flow over the ground surface from the extreme point of the drainage basin and reach the point under consideration It is equal to inlet time (ti) plus the time of flow in the sewer (tf)
Thus,
tc = ti + tf
 

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