Is there a way to repair the broken seal on a penstock that controls a storage basin which cannot be drained?
The seal on a penstock that controls a storage basin was improperly installed and has broken. As it cannot be drained for several more months, I am looking for either a way to repair it and limit leaking or a mechanism/method by which to isolate the opening of the penstock.
In the meantime, the faulty section of the seal is replaced on a regular basis to control leaking as much as possible.
The first thing that comes to mind is to use a thick (10 mil) poly sheet as an impermeable barrier on the wet side, think of a shower curtain, with a chain or cable in a fold at the bottom, giving us double thickness on our curtain. roll the sides up in tubing or 2" schedule 80 PVC pipe to allow for placement and control.
Make certain the sides of the curtain overlap the wall by at least 1/2 the width of the penstock, position it over the offending gate, and lower away, hopefully the chain pulls it down, the water flow pulls it toward the leak and the folks holding the tubing don't fall in. :-)
The general idea is that this will isolate / reduce the leak until a repair can be performed.
Good luck, be safe, if you want, we can figure out a way for you to post pictures so we can save several thousand words. :-)
If you can replace a section of the seal, I deduce that the penstock is located downstream (outside the storage basin itself). If this is the case and the wall is thick and the opening to the penstock is accessible, have you considered installing a plug?
Hi Breizheau and thanks for your answer. Unfortunately plugging the penstock is not an option. I will continue looking into this.