This nice article reminds me of the intake. It is a most horrible thing, sucking in everything. You can even see with Google Maps that it is right in the littoral drift, which is a permanent river of silt. We did geophysics out in the lake, and you could see these giant Sahara-like dunes of silt migrating along the bottom.
As I have written in my fanciful earthquake scenario, these mountains of silt will become greatly disturbed in an earthquake. We will leave it to your imagination.