foot) of the lowest point of water entry. B. Coarse Same as 5 years - 7 Same as for grained for A. day rainfall A. above semi above. equal to or pervious less than and 250 mm (10 pervious inches). (See Note 2) Water 5 years - 7 Continuous table day rainfall wall; generally equal to or openings may 600 mm (2 less than be provided feet) or 200 mm (8 in trench more below inches). bottom to (See Note 2) point of provide water drainage. entry with not more than 10% of the length of trench system showing water within 600 mm (2 feet) but not closer than 300 mm (1 foot) to lowest point of water entry. C. Swelling Same as Same as for Same as for (See soils for A. A. above. A. above Note 3) plus design of joint spacing and joint details to accommodate movement.
foot) of the lowest point of water entry. B. Coarse grained semi pervious and pervious (See Note 2) Same as for A. above. 5 years - 7 day rainfall equal to or less than 250 mm (10 inches). Same as for A. above Water table generally 600 mm (2 feet) or more below point of water entry with not more than 10% of the length of trench system showing water within 600 mm (2 feet) but not closer than 300 mm (1 foot) to lowest point of water entry. 5 years - 7 day rainfall equal to or less than 200 mm (8 inches). (See Note 2) Continuous wall; openings may be provided in trench bottom to provide drainage. C. Swelling soils (See Note 3) Same as for A. Same as for A. above. Same as for A. above plus design of joint spacing and joint details to accommodate movement.
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