You need three measures: length, breadth and depth to find a volume. The question gives only two and so there cannot possibly be an answer.
You haven't told us how long the trough is, or how deep the water is in it. If it's full to the rim ... 2-ft deep ... then there's 44.88 gallons for every foot of the trough's length.
359 gallons for every inch the water is deep.
7615 Gallons
2513.45 gallons.
One cubic foot of water contains: 7.48 gallons.
You haven't told us how long the trough is, or how deep the water is in it. If it's full to the rim ... 2-ft deep ... then there's 44.88 gallons for every foot of the trough's length.
181,248 gallons.
359 gallons for every inch the water is deep.
7615 Gallons
A maximum of 2,019.74 US gallons of water.
2513.45 gallons.
One cubic foot of water contains: 7.48 gallons.
Up to 4,318.26 US gallons of water.
About 3,983 gallons.
approximately 4,440 gallons.
2 244.15583 US gallons
Up to 168.3 gallons of water.