Mark the damaged drywall with a pencil after you determine the area of drywall you want to remove. Use a straightedge to mark lines vertically and horizontally on the face of the drywall. Whenever possible, have the lines fall over the centers of the framing members behind the drywall; this will provide backing and a fastening surface for the drywall patch.
In the United States, those individuals who are affected by widescale flooding may have the ability to apply for government and FEMA grants through the Individual Assistance program. On a larger level, businesses, cities, and communities can apply to the FEMA Public Assistance program for funds to assist after a large flood. For example, the city of Fond du Lac Wisconsin received $1.2 million FEMA grant after flooding in June 2008. The program allows the city to purchase the water damaged properties, demolish the structures, and turn the properties into public green space.