Hmmm... with so many different sources of incoming water it sounds like a tricky thing to manage...
Now if you remove this overflow pipe will there still be some location for water to safely flow out once it goes up the two more feet? (i.e. another overflow or spillway area?) Will all of the bank areas around the pond be capable of handling the extra two feet of water or will it spill out somewhere else or cause erosion not normally experienced? You may find that you won't get the full two feet expected as the banks may not seal all the way around or be high enough all the way around. Oh and do you think the neighbours will notice their diminished inflow? : )
Once again... I will state my extreme jealousy in regards to the size and convenient existance of your water body.
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