I have noticed recently that I have an abundance of green slimy algae coming up from the bottom of the pond in the shallow portions. These portions have been exposed to vegetation growth for the last two years due to the drought. Is the vegetation thats newly under water causing the algae? thanks

No, excess nutrients cause the algae to flourish. Filamentous algae, aka pond scum, actually grows on the bottom and releases its presents to float on top and disgust us folks that like to enjoy our ponds.

How shallow is the areas that have the growth? Algae does start growing from the bottom and because algae lack any stems or vasuclar tissue they don't have the back-bone to grow to the surface in water over about 24" deep, however if you have rooted vegetation like Coontail, Bushy Pondweed or anything like that growing up near the surface then your algae can play leapfrom off of that and grow to the surface. So in most cases if there is algae in water over 2' deep it's becasue there is some rooted vegetation below it and in most of those cases getting rid of the rooted vegetation will get rid of the bulk of the algae. Water clarity also plays a major role, clear water allows more sunlight to penetrate the water and sunlight fuels plant growth.

I dont have to worry about clarity, my pond stays milky, but the fish quality is excellant. I used to worry about the clarity, but as long as the fish seem to be in good health and growing like they should, then I will let nature cure the clarity problem if it is a problem. The algae is growing in very shallow water. 10" and shallower and theres plenty of rooted vegetaion under water now, but shallow.