Discussion
From the following, select the option which is not considered the functional part of surface drainage system.
Answer: C
The option that is not a functional part is the Storage system.
A surface drainage system removes excess water from the land surface. Functionally it has three parts: the collection system (field drains and ditches that gather the water), the disposal system (larger channels that carry it away) and the outlet (the point where it is discharged into a stream or natural channel).
Storing water is the opposite of what a drainage system is for. Storage belongs to water harvesting structures such as farm ponds, so it is not a functional part of surface drainage.
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