Somewhat controversially, Dad has created a spillway at the back of the dam in order to lower the water levels after the recent torrential rains so the "damhouse" isn't totally flooded. It apparently is going to have rocks added next visit to prevent erosion. Ironically, this is the same spillway that Dad closed up several years ago in order to boost the dam capacity. Dave had wanted it not to be changed but there was a misunderstanding and, well, now we have a spillway again.
This is what it looked like before the spillway was put in... the dam floor was covered but not by as much as I expected, so in the scheme of things the spillway hasn't reduced the capacity by that much because the water had already started to overflow around the dam sides.
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