These barriers do not provide protection from high debris flows. These barriers are used to protect building sites vulnerable to low mud debris flows from steep, erodible slopes that are partially or completely void of vegetation due to wildfire burns. This is an inexpensive, temporary protection method that can be used by homeowners before predicted rainfall.
Sandbags deteriorate when exposed to continued wetting and drying for several months .
If the bags need to be used for more than a few months, cement can be mixed with the sand. The cement and sand mixture will harden when the bags dry. Burlap bags, sand, plastic, lumber, cement and plywood are readily available at local lumber yards. Some fire stations and other emergency centers can help with materials too. Often times, volunteers are available to provide assistance in assembling and placement of sandbags.