Answer: The easiest thing to do is to add topsoil to raise the sunken area. Or, to facilitate drainage you may have to install a curtain drain (or French drain) by digging 2' deep trenches along the perimeter of the site, dumping in some gravel, laying a perforated pipe, covering it with more gravel and then the soil you removed from the hole to bring the area up to the right level. The pipes will collect and divert the water and the site should drain faster for you. Hope this helps!
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