10 GA Wire is good for a 30 amp circuit with a 1 ohm resistance at 100' of wire he should be good to run several pumps. They only pull about 5-7 amps right? I have 10 ga ran about 100' to my pond. I have never checked the amp draw but i do know i ran a 3/4hp septic pump and a 1/4 hp septic pump at the same time with no overheating issues ( on a 20 amp breaker) .

Last edited by Krystofer; 07/24/17 08:50 AM.
Just an average guy trying to keep up two ponds.
Main pond 9000 sq ft with 1700 sq ft island 5.5ft avg depth
Second pond 2400 sq ft 4ft avg depth