When pressure distribution systems are installed for mounds, at-grades or pressurized shallow trenches, they are installed (or should be installed) with accessible clean-outs to facilitate regular maintenance and checking of pressures at the distal end of both the manifold and each individual pressure lateral.
When I started working in the industry about the only time you saw a pressure distribution system was in the bed of above-grade mound systems. In Minnesota and Wisconsin, a lot of these have been designed and installed over the years due to the large percentage of areas with high...
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