The back tire of the tractor is 2 inches away from a 100 foot drop off.... 

We had to curve around a rock about the size of a VW. 

This is a good French drain. The grade has a very good pitch. The trench is 2 feet deep by 22 inches wide.  The bottom of the trench has 2 to 4 inches of drain rock, then the perf pipe [this one has a sock over it]. Then 14 more inches of drain rock, with the same fabric as the perf pipe sock, and its 36 inches wide, and that is covered up to the finished grade with drain rock. The bottom end where the water drains out meets day light  [exposed] and is not buried so water can flow out. This French drain will work and flow a good amount of water. It helps so much to have the rock come all the way up to the finished grade and not covered  with dirt or lawn. It is best to have the end where the water comes out[meets day light] not buried.....

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