Thanks for the quick responses-you guys are really great to share your experience. I'm not sure what waterflow and temperature is going to be like throughout the year. The spring that I mentioned before is actually under our house and the sump pumps the water out to the pond 10-12 times per hour (on a dry day)with about 2-3 gallons per shot. Today the water in the sump is 59 degrees and the pond is 52 degrees. A submersible pump in the pond will feed the 15' waterfall. Below are the average high and low temp and preceipitation by month.
High Low Precip
Jan 40.0� F 20.0� F 0.84 in
Feb 47.0� F 25.0� F 1.02 in
March 57.0� F 34.0� F 2.71 in
April 67.0� F 44.0� F 2.57 in
May 76.0� F 54.0� F 4.16 in
June 87.0� F 64.0� F 4.25 in
July 93.0� F 69.0� F 3.31 in
Aug 92.0� F 68.0� F 2.94 in
Sept 82.0� F 59.0� F 2.96 in
Oct 70.0� F 47.0� F 2.45 in
Nov 55.0� F 34.0� F 1.82 in
Dec 43.0� F 24.0� F 1.35 in