separate system

combined system

partially separate system

partially combined system

is cheaper in initial cost than dry conservancy system

requires treatment before disposal

creates hygenic problem

all of the above

4 mm/hr

lOmm/hr

20 mm/hr

40 mm/hr

the time taken by rainfall water to run from most distant point of water shed to the inlet of sewer

the time required for flow of water in sewer to the point under consideration

sum of [a] and [b]

difference of [a] and [b]

much greater than 1

slightly less than 1

equal to 1

slightly greater than 1