Welcome to Pond Boss Grant and congratulations on your upcoming pond project. I am far from an expert but will share some opinions of mine to your questions below...
1)What size of dozer should I get for pushing dirt approx. 100 ft. - I will rent for 40 hrs. - I have no idea about dozer size requirements and would recommend at least having an expert excavator look at your project. I'm sure a consultation would be well worth the cost in the long run.
2)Do I have to use a sheeps ft. to construct the keyway in the center of the dam & or all banks? - Compaction of the core and dam overall is very important, Again, I would ask an expert.
3)What size of overflow pipe is needed/I have 30 acres that flow over me from a valley? - Your water shed sounds very similar to mine in size and I used an 8" pipe, however soil types differ so your needs may be different also.
4) Can I simply use a spillway instead of a overflow pipe? - You can do that but most pond builders recommend a pipe.
5)How do i size an emergy. spillway if i use overflow pipe? - Your local Natural Resources Conservation Service (NRCS) agency should be able to help you with coming up with that information.
6)What is the best panfish to stock? - It really depends on your goals and I'm sure others will answer with recommendations for your area of the country.
7)Should I stock w/ SMB orLMB? - Again, it depends on your goals but you can always start with SMB and transition to LMB, but you can't do it the other way around.
