as high and as deep as you like....
it'll still be cheaper than allowing illegals to stay here...
FOR EVEN ONE MORE YEAR!
and if you are reeeeely interested (which I doubt) in the cost, depth, height of the wall/s ; I can refer you to the U.S. Army Corps of Engineers who will be glad to accommodate you.
You think a wall is the answer.
I think it will help in some places, but it is not the answer.
I've been "reeeally" interested a long time since my involvement with this matter since pre-Prop 187 and my involvement with Prop 187.
Obviously, from the tone of your posts, we'll just not have to discuss, you and I.