Rims

[Gravdigr]

Originally Posted by glatt

Did they ever figure out the cause of the sinkhole?

Just some facts:

1. There is a large drainage pond adjacent to the museum.

2. The basin the pond is in is about 30 feet deep.

C. The sinkhole caved in about a week and a half after some sustained low single digit temperatures (0-5 degrees).

I don't know where the drain lines for the pond run.

Here is a GooglEarth snip:

The asterisk marks what I think is the approximate location of the sinkhole inside the dome. It's either where I marked it, or, on the opposite side of the red spire.



And StreetView:

[xoxoxoBruce]

Originally Posted by Gravdigr

Just some facts:

1. There is a large drainage pond adjacent to the museum.

2. The basin the pond is in is about 30 feet deep.

C. The sinkhole caved in about a week and a half after some sustained low single digit temperatures (0-5 degrees).

I don't know where the drain lines for the pond run.

Around here those retention ponds are require for all major construction projects. They're designed to hold the rain/snow running off all the impermeable surfaces in the project. That's all the roof area, parking lots, and pavement. Once that water is collected it's supposed to be released at a slow enough rate that it won't overwhelm local creeks/brooks flooding people downstream. Some evaporates, some sinks into the soil (although not much because the retention ponds are usually lined), some may be connected to storm water systems(never sewer), but usually they're drain to naturally occurring water courses.