I've been monitoring the water that I pump from a natural spring under my house into my 1/2 acre pond and have found that it is about 60 gallons per hour unless its been raining. Currently the water empties into the pond about a foot below the surface and the water from the spring is 59 degrees. Assuming the spring water stays roughly that temperature throughout the Summer, I'm wondering whether it would be better to run a length of PVC into the bottom of the pond to inject the new water into the bottom of the pond. Which would be most likely to reduce the possibility of stratification?