Sydney is Australia’s most populated city and its mainly humid and subtropical climate brings it rain throughout the year. It has more than 1200 mm of rain in a year with a fair amount of thunderstorms that bring in heavy rain. This sort of weather and rainfall could have caused conditions that led to flooding of streets and built up areas, if it had not been for the efficient storm water installation Sydney authorities had designed, built and maintained.
For any efficient storm water drainage system, it is necessary to have a complex system of pipes, stormwater drains, connectors and other devices that carry away the excess water from rainfall runoff to a point of discharge where it finds its place in a large water body. You also need proper equipment or devices that also trap debris and other waste that can lessen the volume of the discharged water, while also preventing the pollution of the water body. Drainage systems make it easy for the quick removal of water from storms and prevent flooding of open areas and streets. This water is led into rivers, lakes and even the ocean. Sydney has this advantage that it can lead the excess water into the ocean, as it is a coastal city.
While deciding the sizes of pipes and drains that prevented overflow and flooding, engineers involved in storm water installation Sydney design took into account the maximum intensity of rainfall over an hour and calculated the amount of runoff that has to be catered for. They also took into account the catchment areas that each drain or pipe catered to and built-in safety margins to allow for any variation caused by extreme conditions or even temporary blockage. Urban development alters landscapes and prevents the rain being absorbed into the ground, and this is what makes it very important to have a proper system of storm water drainage that can carry away all the runoff to holding ponds or other water bodies that can absorb this.
Engineers and designers in Sydney are increasingly looking at viewing stormwater as a resource and are frequently changing storm water installation methods to get them to help in the recharging of underground water instead of water that has to be just drained away. Water-sensitive urban design now being adopted in most major cities in Australia, including Sydney, are meant to restore urban water balance by increasing the reuse of stormwater, as well as grey water and recycled water. Stormwater treatment is integrated into the landscape so that it helps in maintaining open public spaces, and also for recreational and wildlife habitats. Residents are also encouraged to harvest rainwater and prevent it from becoming runoff and use this water for gardening and washing. This storm water has to meet certain quality standards for its reuse through the capture of polluting elements and sediments.
Detention of rainwater runoff is considered more useful than its rapid conveyance to water bodies, and its reuse, storage, and infiltration is considered a better alternative than augmenting storm water drainage installations.