Lord Herbert wrote on Sep 22
nd, 2014 at 11:56am:
The labour force would have been composed of allied prisoners of war, Jewish slave labour on a starvation diet, and old men and teenage Germans from the local area.
The same sweatshop labour force could have been used to build more fighters, bombers and tanks.
There was an
opportunity cost to diverting this labour.
The important question is what it cost the British. Did the Germans lose more than the British? If so, and it set the Germans back, then the bombing raid was worth it.
http://en.wikipedia.org/wiki/Operation_Chastise#After_the_raid Quote:A few mines were flooded; 11 small factories and 92 houses were destroyed and 114 factories and 971 houses were damaged. The floods washed away about 25 roads, railways and bridges as the flood waters spread for around 50 miles (80 km) from the source.
Looks like the damage was quite extensive.
Even if the Germans quickly rebuilt or repaired the dams, the British could have continued bombing the dams over and over again, leaving the Germans without electricity for months and maybe years. Blame it on Arthur Harris and his fixation with area bombing for the RAF not attempting bombing raids on these dams again. If it forced the Germans to build anti-aircraft batteries around the dams, that was even better.