you've got a gravity fed watershed pond system on your farm: your upper ponds hold water for your aquaculture ponds further down the hill. you are filling a few ponds for catfish fry that you bought from a supplier down the road. you've got 5 fry ponds that are 1/2 acre in size and 3 feet deep each. your water holding ponds up the hill have been collecting rainwater all winter and you know from past experience that they hold around 8,500 metric tons (m3) of water. how many of your fry ponds can you fill from your watershed? (you don't want any half-filled ponds)