Thanks for the reply. Answers to you questions:
Step 1: Battling rising ground water from underground springs. The water bubbles up to the surface through sand when it encounters a large seam of clay and other less permeable soils.
Step 2: Providing limited surface water drainage because I...
See attached detail for proposed design for section of French Sub-Drain.http://files.engineering.com/getfile.aspx?folder=f3bc14f9-d924-4a86-be92-ddb9f9a6836e&file=French_Sub-Drain_Detail.jpg
I have read with great interest thread193-290956 and thread158-162089 where the design of combined french sub-drains/surface drains are discussed.
Past Solution for context:
Over a dozen years ago I had to replace an old clay tile drain system that had still been functioning decades later...
