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It is very difficult to achieve an I:P ratio of 20:1 for infiltration trenches/chambers, these are meant to be long narrow features that don't take up much surface area. To avoid overloading by sediment, which is the intention of minimizes I:P rat...It is very difficult to achieve an I:P ratio of 20:1 for infiltration trenches/chambers, these are meant to be long narrow features that don't take up much surface area. To avoid overloading by sediment, which is the intention of minimizes I:P ratio, can use good pretreatment.More