Posted by Astro
I can't speak for all of them, but I also needed to know. When I measured one in Houston, it was about 5.5 feet deep. I remember this so well because that's how tall I am head to toe. We used a rope tied to a brick, knotted at every foot.
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Sediment pits are usually only used with catch basins (aka street drains).
Posted by NotQuiteHuman That flooded part is almost certainly by design. I looks like a plunge pool (often called a sump) to me. Water from up the shaft falls into the pool where it's energy is dissipated. If the falling water were to land directly on bare concrete, it would quickly erode it away.
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I agree with the
plunge pool hypothesis.
Posted by Aran Hard to say just based on the pictures but it could have been a flooded drop shaft to a deeper system. I've seen ones in drains that easily surpass 100 feet deep.
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That sounds like an exfiltration weir which allows water to flow directly into an aquifer. If the rate of inflow exceeds the percolation rate into the aquifer, the weir would overfill and the excess water would go to the outflow.
An exfiltration weir could be hundreds of feet deep in order to reach the aquifer. Although these would not appear to be
full in normal circumstances and the water level in the weir would be at or close to the water table.