Look before you step. When walking through standing water, use a pole or a stick to ensure there is still firm ground to step on. Do not drive through a flooded area. The water may be deep enough to float your vehicle off the road. Drowning is the number one cause of flood deaths.
More people drown in their cars than anywhere else.
Do not use an open flame to inspect damages. Use a flashlight where there are known gas lines. A candle, lantern, or even a cigarette lighter can cause an explosion if there is gas. Stay away from power lines. Electrocution is the number two cause of death during a flood.