The Drainage System of A Building

Ismail Saad
August 23, 2021
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The drainage problems are a knowledge that the ancients have inherited through their experience and passed it on to us. The drainage and flood control system of a city is an indispensable part in urban construction planning. Urban drainage system construction’s contents are diverse, big to road and roadside ditch drainage, while small to a house drainage. 

If you’ve been camping in the wild, you would know that when we build a tent, we usually dig a trench around the tent to prevent rainwater from entering the tent if it rains. Isn’t this an interesting tidbit? In the same way, our houses need to be supported by a drainage system, otherwise we in rainy Malaysia will worry about the flood in our yards everyday.

The basic equipment attached to the interior of a building includes water supply and drainage system. Among them, the construction of the house drainage system can be subdivided, respectively for the drainage system outside the building and the drainage system inside the building. 

The drainage system in the building is used to eliminate the waste water and excrement in our daily lives. Sanitary wastewater is usually directly discharged into the city drainage pipe, and the fecal sewage is usually discharged into the city drainage pipe after it goes through the septic tank. 

On the contrary, the drainage system outside the building refers to the roof drainage. Roof drainage can be divided into external drainage system and internal drainage system according to the different installation position of the roof rainwater pipe.

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The external drainage system means that there is no conductor head on the roof and no rainwater pipe in the building to discharge rainwater. According to whether the roof has a gutter, the system can be divided into eaves drainage devices and gutter drainage devices.

  • Eaves drainage device is usually used for residential buildings, public buildings with small roof areas and single-span industrial buildings. The rainwater on the roof collects in the eaves trench of the roof, and then flows into the rain falling pipe along the eaves trench, and then drains down to the underground trench or the ground.
  • Gutter drainage devices are usually used to remove rainwater from large roofs, especially multi-span roofs. The gutters on the roof receive rainwater from the roof. Rainwater runs through a standpipe outside the walls from the gutter to both ends of the building, and then to the ground.

The internal drainage system means that the roof is equipped with a conductor head, rainwater collected into the standpipe through the conductor head, and then discharged into the urban drainage pipe through the in-built drainage pipes of the building, or directly discharged into the outdoor through hanging pipes.

Due to the multiple shapes of modern buildings, it is recommended to use the gutter drainage system for the roof drainage. Gutter drainage is safe and reliable, will not cause roof leakage by poor construction, and the construction is simple, and can also reduce the buried depth of the house rainwater pipe. 

On the other hand, structural load increases as the gutter has a certain slope and is longer, with a standpipe outside the wall, and also with the cause of a thick roof cushion. Therefore, if the roof accumulates dust, it will cause gutter obstruction and damage. In addition, due to the rainy and sunny weather, the gutter repair in Malaysia needs to be promoted to more people.