| United
World College of South East Asia. Full slitdrain (photo A), sand
carpet field and training area (photo B). Trenching main drain. |
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A.

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B.
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| Trenching
lateral drains at 90 degree to main drain across field (photo C).
Trenching slitdraiins at 2mtrs centers (1st pass) across lateral drains
(photo D). |
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C.
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D.

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| Backfilling
gravel and sand into slit drains (photo E). After slitdrain installation
and 50mm of sand spread (photo F). |
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E.
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F.
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