cents.... The downspout on your garage should emptying toward the back - not the side - There are a variety of attachment and extesions to direct the run. I dug a out a basin at the end point and filled the bottom and sides with stone. I notice you have no plants growing in your back yard. You may have build a slight mound to filling the hollow where the pond forms surround it with flowering perenials and a small ornimental tree and the water that destroyed your grass will water your garden.