A bleed valve (dam block under levees) for regulating deep reservoirs.
A lot of people have asked about this feature in one way or another. Some ask for the ability to put levees on top of dam-blocks. Some ask for ways to stack floodgates for a 6 levee deep water reservoir.
I've made a mock-up of a "reverse dam"-piece, a bleed valve, capable of being put under levees. It occupies a 3x1x1 volume and the center block is solid.
The idea is that this block allows you to drain water from the BOTTOM of a dam.
I assume it will be possible to do this with the same in-engine features as the pump station and dump site (water buildings).
The flow through one of these can be Q = (p1-p2) * C * S
-where p1 and p2 are the water depth on back-side and front-side of valve,
and C is a constant set by developers after testing,
and S is the setting of the slider where the player adjusts the flow of the water.
I think it's a good idea to allow the player to fully close the valve, because one can not block the valve on either side.
Thank you for your consideration.