Conditioning your crawl space is the best way to remove the dampness and flooding. It will also lower your heating and cooling bills by sealing and conditioning your crawl space. More importantly if you have return ductwork in your crawl space that leaky ductwork will pull in the musty crawl space air and circulate it throughout your house. By conditioning, sealing up with heavy mill plastic sheeting for floor and foaming/foam board the walls you will remove the musty smell and any water or mold.