Working on a project where we have limited depth to the point where storm sewers lack typical cover and are even not fitting into catch basin structures. The client wants to have a retention basin as an aesthetic feature on site. One way to remedy the storm sewer elevations would be to lower the pipes that discharge into the catch basin and therefore that lowers my storm sewers but submerges them below the normal water surface. If we did that, what are the pros and cons of doing so. I know I've seen it done from place to place but have not been comfortable enough to do it on one of my projects. I guess my biggest concerns would be freezing and siltation within the storm lines. It seems like this could have an adverse effect on the pavement over time also because I would think the trenching would stay wet also (maybe clay bulkheads could remedy wet trenches). Thanks for any insight in advance.
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