We had problems where at the lowest point when it rains the water goes there........We decided to put some rocks down there and then I did soil on top so that created the base for the amended soil of mulch dirt, lime......did that on top..did plant flowers ...added 10 more bags of canadian black mulch and the excess water comes up and keeps the flowers moist. Or if you can use a big pick....the one that has a point on one side and a 3 inch dig on the other side.......you could so a long long 3 inches deep to creat a ditch.....you don't need much to make a run-off