Sunil I exclude all of the pond within 25 ft of the bank from that calculation as it is the biggest structure of all. I further assume that there will be some shallow bank structure (logs pallets, brush etc) anyway. Most info suggests 1-2 brush piles etc per acre. If the pond is 100 X 100 and you take away the 25 feet both sides you have 50 X 50 with 2 structures. That is enough to concentrate the fish.


http://msucares.com/pubs/publications/p1428.pdf

In ponds of less than one
acre, one brush shelter is enough.
Larger ponds need one or two shelters
per acre.
Select attractor sites that are
accessible to anglers. Good locations
are found in water 5 to 10 feet deep
near creek channels, off points, or at
dropoffs.