Sandbags deteriorate when exposed for several months to continued wetting drying. If bags are placed too early, they may not be effective when needed. If it is necessary that bags remain durable for a longer time, the addition of cement can increase effective life. In cases where sandbag placement is intended to be semi-permanent, durability can be improved by mixing 10 parts of sand or soil with 1 part of cement. The materials can be mixed and placed dry. After all the bags are in place, a light sprinkling of water is desirable.
Sandbags are basically for low-flow protection (up to two feet). Protection from high flow requires a more permanent type of structure.
Proper planting of slopes prevents erosion. Keep plants watered, but do not overwater. Replant barren areas.
Make inspections during rains. This is when trouble occurs. Watch for gullying. Correct problems as soon as possible.
Sandbags, tools and sheets of plastic may come in handy during heavy rains. Keep them available.
If unusual cracks, settling or earth slippage starts, consult a qualified civil engineer or geologist immediately.
Do not alter your slopes or drainage without expert advice. Consult a state licensed civil engineer.