That is it. Well done evansb -You have control.
I had several more hints ready, but you were too good. I guess the area reserved for the water tanks was a dead giveaway.
- The fenced off area was kept by a water supply authority and now contains several large water tanks.
- The airfield was expanded to the south in 1935 and 1943, and to the north in 1947.
- Housing development has surrounded the airfield now and, as usual, residents are clamoring for the airfield to be closed, even though it was there first!
Here is what it looks like now.