We have a 14" space between our garage and our neighbor's block wall.
It leads to an alley in the back of our house. It's just wide enough for someone to fit through if they want to enter from the alley.
This little opening was, I believe, originally intended to allow water drainage away from our backyard. So, our backyard I kind of graded so that water exits via this side opening, and I need the ground area to still help with this function.
How do I secure this gap so that it prevents intruders from coming in AND allow me to access this area to remove debris and weeds?