Drains

Hello, i am here to inform you how a drainage basin works.

Firstly, what is a drainage basin?
It is the area of land of land where water from rain and melting snow or ice drains downhill into a body of water, such as a river, lake or reservoir.

A drainage basin is an "open" system, where it has inputs and outputs.

Inputs include precipitation while outputs include evaporation and transpiration.

So, basically, how does the water move through the drainage system. There are many ways like infiltration, througflow, overlandflow and groundwater flow.

The first picture is a picture of a Singapore drainage basin, also known as the "kelong". It is a channel that transports water to other areas such as the sea.

When there is a high amount of rain, water is not able to infiltrate the ground as the soil is holding its field capacity. When the infiltration capacity is exceeded, water is unable to soak away into the soil and overland flow occurs. This could result in major floods.

Shu Yih