Drainage

Illustration of mosquito ditches

Illustration of river base with watershed and modified coastline

Illustration of corrugated culvert pipe

Illustration of culvert

Illustration of estuary base with rocky catchment and salt wedge

Mining activities with drainage

Illustration of a drainage pipe with several sources, partially underground

Illustration of a second type of drainage pipe, partially underground

Illustration of a pumping station for sewage

Illustration of a drainage pipe aiming downwards

Illustration of watershed management