Older roads may have less sophisticated drainage, but all have features designed to take the water away from the road surface. It is necessary to clean and maintain these drainage provisions so that they can work properly.
Problems can occur even when drainage provisions are clean and well maintained. Flooded and waterlogged roads result when the amount of water arriving on the road is greater than the capacity of the drainage facilities that take it away.
Exceptional rainfall, a road being in a low lying area, changes in 'run off' from adjacent fields and rivers overflowing are some situations that can lead to the road flooding or being waterlogged even when drains are in good working order.
Material carried into the drains by floods can also lead to them becoming blocked. Drainage grills and gratings (for example on gullies) can become blocked very quickly when materials like mud are deposited on the road or when there is a heavy fall of leaves. If a flooded road is caused by a ruptured water main the water company will be responsible for repairing the damage.
Water is directed to drains by the road profile. Puddles (ponding) tend to occur if there is a depression in the road. This can be rectified where necessary by local patching of the road surface.
The following notes give guidance on who to contact for various types of flooding: