Before taking a shot at your questions could you answer one for a dumb eastener? What's a 'swale'?
1)Yes. Search this site for pertinent information ie: species of fish, stocking rates, feeding, water quality, water plants, built in structure, ect. It's all here!
2)Since it will be a dug pond (no dam) your main concern reguarding flooding will be the spillways. If it is indeed good clay/soil then a good covering of grass may suffice on the emergency spillway. I would probably rent a small compactor to use on the spillways just to be sure. Note: Emergency spillway should be 1' below primary spillway. Read some of Cecil Bairds post re. spillways.
3) 150' x 50' .. Yes!
4)Subscribe to "Pond Boss" magazine! Just click on the icon in the upper right hand corner of this forum.

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If you can read this ... thank a teacher. Since it's in english ... thank our military!
Ric