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Line 158:
Line 158: − |- − |Over-sized underdrain||Moderately sized underdrain (or no underdrain)
→Design
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|No pretreatment||Pretreatment provided as part of inlet design
|No pretreatment||Pretreatment provided as part of inlet design
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|Filter bed < 0.5 m||Filter bed > 0.75 m
|Filter bed < 0.5 m||Filter bed > 0.75 m