How the stormwater systems works during heavy rain?

1. Route of rainwater moving to the ocean
Rain water falls on surfaces like park, garden and buildings. and runsoff roof, through down pipes and out to the staight. on the straight, It has typically underground minor pipe system and overland major road systems work in tandems.

Rainwter is collected in the Kerb and gutter and flows into drains called "side-entry pits" and it flows into network of pipe and it discharged into creek, river, lake or ocean

cross section of underground minor system

2. Reason of the road is submerged by stromwater
when it rains, leaves, rubbish and other debris on the street can be washed into and may block stormwater drains. While street sweeping helps in picking up some rubbish, But it can't pick up everything. sometimes, stormwater system fills and reaches its capacity, stormater in the gutter may subsequently start to rise and reach level where the road becomes completely submerged, followed by council verge. and street becomes the major overland stormwater system.

once the stormwater less, minor stormwater system capacity improves. how it could be fast is depends on size of the pipes, gradient of the street and kerbing, any blockages and the end conditions where the minor system discharges.

3. The place where it can be eaily infulenced by storm water
Where the stormwater flows will depend on the lay of the landscape and the environment. properties that are on the lower side of street may potentially be at greater risk of flooding.

Watersystem along the coast are easily influenced by tide levels. Major rain events that coincide with high tides or ocean strom surges impact the minor stormwater system's ability to drain out and it resulting in upstream flooding. Even after the rain stopps, there may be flooding until the tide level falls.


+ word
원활한 우수배제 : freely draining
길거리의 쓰레기 : rubbish(no longer usefull trash) / debris(scatters ramain after destoyed or broken)
동시에 작동하는 : work in tandem / symultaneously
그 이후에 : subsequently
물에 잠기다 : submarge
길가를 따라 : followed by the verge
저지대 : Lower side on the street(낮은 방향의 길)
협작물 : any blockages
해수면 높이 : tides level