I'm in the process of getting a new pond permitted. The DEP in concerned that the warm water overflow will adversely effect the temperature of the receiving stream which is designated as a "High Quality; Cold Water Fishery". As a mitigation measure I will propose a bottom discharge standpipe.

Does anyone have info on the summertime temp differential from top to bottom? The pond will be about 14' deep and approx. 1 acre in area. Location is south western PA.

I have a call in to the Conservation Service but no reply so far.