Patrick Moseley
New User
- Location
- Fort Worth, TX USA
Guidance needed on replacing a cable in navigable waters.
I need to provide a design to replace a 480V feeder to a fixed raw water pump station 4100’ away from shore in a large man-made lake. The load at the pump station is roughly 30 amps. The pump station is a vertical steel can with screened inlets. The station has two raw water pumps at 20hp each; only one pump can run at a time. The pumps are located inside the steel can. A work platform is mounted on top of the steel can with the pump starters, RTU and mini-power center. The pump station is located in the shallow end of the lake with normal water surface being 18’ deep.
The lake is primarily used for water supply and flood protection but does also allow recreation use. The lake is considered navigable waters by the state. The AHJ has no guidance on the cable or installation methods; the AHJ may not have any other installation like this on his lakes.
I find it very difficult to apply the definition of 682.2 to this size of body of water, that is not directly used for industrial or commercial purposes and is open to the public. But it also does not fit articles 553 or 555 very well either.
The existing submersible pump cable was installed twenty years ago and has failed several times requiring splicing. The first 350’ feet was buried, then the last 3750’ was laid on top the lake bottom to the pump station. During the normal 10/12 year wet/dry cycles, the cable is exposed during the drought conditions.
I am trying to provide a standard of care in the design, but without input from the AHJ or guidance from other entities, I am having to defend not just doing it like they did twenty years ago.
I have found a simple document from the Corps that says to protect the underground/water feeder as it enters the water. The document was for a single residence floating dock.
Any advice?
I need to provide a design to replace a 480V feeder to a fixed raw water pump station 4100’ away from shore in a large man-made lake. The load at the pump station is roughly 30 amps. The pump station is a vertical steel can with screened inlets. The station has two raw water pumps at 20hp each; only one pump can run at a time. The pumps are located inside the steel can. A work platform is mounted on top of the steel can with the pump starters, RTU and mini-power center. The pump station is located in the shallow end of the lake with normal water surface being 18’ deep.
The lake is primarily used for water supply and flood protection but does also allow recreation use. The lake is considered navigable waters by the state. The AHJ has no guidance on the cable or installation methods; the AHJ may not have any other installation like this on his lakes.
I find it very difficult to apply the definition of 682.2 to this size of body of water, that is not directly used for industrial or commercial purposes and is open to the public. But it also does not fit articles 553 or 555 very well either.
The existing submersible pump cable was installed twenty years ago and has failed several times requiring splicing. The first 350’ feet was buried, then the last 3750’ was laid on top the lake bottom to the pump station. During the normal 10/12 year wet/dry cycles, the cable is exposed during the drought conditions.
I am trying to provide a standard of care in the design, but without input from the AHJ or guidance from other entities, I am having to defend not just doing it like they did twenty years ago.
I have found a simple document from the Corps that says to protect the underground/water feeder as it enters the water. The document was for a single residence floating dock.
Any advice?
