Rod has some good background on this topic and hits on some good points but I want to add a few of my own.

1. The cost vs value figure to me is something you can only put a number on if it's non-recreational.

2. Water has a funny way of speeding up through narrow passageways so I would stick to the consideration of wider is better for the purpose of slower flow in high rain events which are less likely to erode or "cut" a new channel.

3. For this size of project, (as Rod mentions above) it needs to be very well engineered because money is money.. doing it right once is ALWAYS cheaper than having to go back and redesign.

4. And least important, if I had a 70-75acre pond, I would move to Africa to make it happen... The fact you have this opportunity is nothing short of amazing.


www.aquaticspecialties.info
May God be with the Overton's Family.