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ditch retaining wall construction
Sounds like you've got a real problem to solve. I'd have to agree with Blizzard especially on the PT plywood, a mid sized city would'nt let me build my Grandkids a playhouse with PT 4x6 skids under it. Not seeing your ditch has me shooting in the dark a bit, but my feeling would be two to four inch crushed limesotne on the bare ditch walls first then topped off by big riprap six to ten inch would outlast any wood structure and cost less too. Sealing off the side of your plywood wall with plastic is only going to cause excess water to seek it's exit on the side of the wall where you don't want any water flow and cause erosion behind your wall where as the crushed limestone covered with heavy riprap will let the subsurface water find its way to the stream thru the stone and not erode behind it. Just my thoughts, best of luck, Frank.
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ditch retaining wall construction
Trbomax; As Blizzard said, surely others up and down strem are having the same problem caused by the parking lot drainage. Who was there first, you or the parking lot? Around here we have lots of pond construction using existing creeks as a water source. By law you cannot when building a pond back water onto public right of way or another persons property or submerge a pre esisting tile outlet. So common sense tells me that the pond backup issue should also work in reverse that if the parking lot has caused the problem then the owners of the lot or lots should have documents on file somewhere at the courthouse stating that code was followed regarding drainage from their lot no matter who was there first. There is a similar issue in a nearby city here where housing developments were built leagaly above the floodplain 25 yrs ago, but since then the old downtown busineses have been starved to death by the superstores going to the suburbs. The superstores and the streets required to get to them have since paved over God only knows how many acres of land thwe now drain into the creek thru the 25 yr. old development to the point now where a 2 inch rain is a major flood problem. I really haven't kept up on that situation enough to tell you how it's going, but it has been dragging on for years. Best of luck. Frank.
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