Subtopic: Leaching requirement and salinity control
Question Statement:
The gridiron pipe drainage system is more economical than the herringbone pipe drainage system because
Options:
(A) it is adopted in the fields which do not require complete drainage
(B) the number of main or sub-main lines is reduced
(C) the number of junctions and the double-drained area are reduced
(D) it has only main or sub-main lines
Official Answer Key:
C
Step-by-Step Solution & Explanation
In the herringbone layout, lateral drains join the main/sub-main from BOTH sides at an angle, converging near the main — this creates more junctions and areas that are effectively drained twice (double-drained area), both of which add unnecessary pipe capacity/cost. The gridiron layout has laterals joining the main from one side only (perpendicular, non-converging arrangement), reducing the number of junctions and eliminating double-drained areas — making it more economical for fields requiring complete/systematic drainage. Answer: (C).
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