Planning the French Drain

Planning, first, for the half-round. I'm thinking that I'll only run it on three sides. I dunno if the backhoe would damage the pipe, rolling in and out of the shelter.

"For best results you need to use these steps. Dig a 14” wide trench and line the trench with the 8 oz. commercial filter fabric. Then put 3 inches of rock at the bottom of the trench. Place the 4” perforated corrugated pipe (without a sock on the pipe) on top of the rock. Next fill in around the pipe with stone on all sides and wrap the filter fabric on top. Now it is fully contained to not allow sediment or solids to contaminate the French drain compromising its performance." French Drain Man

To run along three sides of the half-round, I'll need about 90 feet of trench, 14" wide and averaging 36" deep- it needs to slant down to the cistern.

90*12*14*36=544,320"
544,320/46660= 11.7 cubic yards of crushed #57 rock. I've contacted a gravel company and I expect that this'll cost about $800 - $1000

The filter fabric is about $500 for 10' wide by 100' long
Non-Woven Geotextile Filter Fabric 8 oz - Landscape Fabric - Sandbaggy

The PVC pipe is going to be around $100