How much of each rolled end should a firefighter turn to create the corners of a basin in a water catchall from a salvage cover?

To effectively create the corners of a basin in a water catchall from a salvage cover, a firefighter should turn 3 inches of each rolled end. This measurement is considered optimal as it allows for sufficient material to be manipulated into the corners to retain water, while also providing good structural integrity. The 3-inch turn creates a secure and stable edge that helps prevent water from leaking out of the basin, enhancing the overall effectiveness of the catchall.

Using a smaller measurement, such as 2 inches, may not provide enough support for the corners and could compromise the basin's ability to hold water efficiently. Conversely, turning more than 3 inches, like 4 or 5 inches, would unnecessarily use up material, making it less efficient and potentially causing issues with the overall size and shape of the catchall. Thus, the choice of 3 inches is a balance between adequate support and efficient use of the salvage cover material.