replying to phelps, Var wrote:
Don't know what the length of the arc of your window well is, but what I did for
raising mine about 4 to six inches taller was to get a length of garden/lawn
edging and attach it to the window well -- on the outside -- with self-tapping
screws and silicone the inside edge where they meet. If I had to raise it more,
I would buy a large plastic trash can and cut it to get a band of hard plastic
the depth I needed and do the same. 10 inches might be too much dirt for plastic
to hold back, but six would be no problem.