Were I to undertake such a task ....
Here's how I would go about it :
Find out if it's legal, first ;) ... and if so ---
Procure myself some 5gal plastic buckets (free ones !! )
Place buckets in bed of pickup & head to the lake
Stop alongside of the highway, where the road has been blasted thru a hill
Fill buckets with rocks/gravel that has fallen from the rock cliffs
Launch boat with rock filled buckets aboard
Drop handleless buckets in the shallow areas I want "stumps" in
Drop buckets with handles still attached, in the deeper areas
To insure that the deeper buckets sit upright, when they reach the bottom ... I would use a length of ski rope or anchor rope, with a large S hook attached ... hook the S hook to the handle and lower the bucket to the bottom ... jiggle the rope to free the S hook from the handle.
If I were so inclined ... I could also place some small branches down into the buckets, or even thru holes in the sides of the buckets, just for added cover effect. Also, having cleaned the buckets of any residue of its former contents (esp if bleach is used) .... scarring the outer surface with sandpaper or file, would allow the algae to build up faster.
Out of pocket cost should be minimal, if there even is any cost :p
That's how I would go about it ...so, feel free to copy or tweak the method as you wish ;)
... cp :cool: