Re: Corrugated Drainage - French Drain
Ditto Houston's suggestions.
In addition, with the use of solid pipe, there is not need for gravel nor plastic around the pipe. You will want to grade the bottom of the trench to be as flat as possible from end to end with a fall of 1/4" per foot.
By flat, I mean that you want the trench to be an even grade from end to end, you do not want hills or valleys where water and debris can get clogged. By 1/4" per foot fall, that is for every linear foot of travel, you want the grade to deepen by 1/4", for example, a 20' trench will be 5" shallower at the inlet end than at the outlet end.
If you were going to use perforated pipe, then the gravel gives the water a place to go until it can seep into the ground, again, you would not use plastic in the trench in this instance either. At most you would lay landscape fabric over the gravel layer, which will help to keep the dirt from polluting the gravel drainage.
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