Here are some answers and my thoughts.
The head or total fall is 20 ft top of dam to the mean water level of the brook
June measurement is 22 ft/sec2 - that is the low period flow. The majority of the time the flow will be higher.
Tther info: the brook is the sole drainage for 24 square miles.
The state has it permitted at 32Kw
A crossflow turbine (JLA 59?) charts the flow and head for an output of 30+kw Some other charts rate the potential at only 16kw max. So, something is not right.
Distance from the dam where the 24 inch pipe is stubbed in, to the power house is 40-45 feet. (Pipe is stubbed in under the flume)
There is a turbine bay poured into the power house. the right hand side of the power house has a 16ft steel overshot wheel in it right now - hooked up to a 5KW generator. Worst case is that I regen it for a 10 kw generator - there is enough torque there I'm sure. Calculated torque of the wheel is 7,253 ft lbs.
While the wheel is nice, I think a penstock and crossflow or other turbine will provide a huge increase in power output.
here is a pic, let me know if you want more info.