RAH I don't think you're numbers are wrong. The reason for the pond filling so fast the lT time, was we got a total of 9 inches of rain over 3 days. We also got 4 more inches the next week. I have frinds that have ponds around me. They say in the heat of somer they have to run there pumps around 24 to 50 hours a week to keep there pond full. One has a 1/2 scre pond, one has a 2.5 acre pond and the third never runs his pump. He is lucky. His pond is spring feed.