Also referred to as a downspout, a rainwater downpipe is a pipe that runs vertically to direct rainwater from a rain gutter system to the ground level and away from the foundation of a building. 

In residential applications, the discharge from rain gutters and downpipes can be directed away from a house in a variety of ways. Each discharge option has specific advantages and disadvantages that should be taken into account before reaching a decision on the best way to get rid of roof run-off.  

Continue reading to acquaint yourself with the 3 main ways downspout water flow can be diverted away from your house.

Directly connected to a drainpipe that runs to a soakaway

Also known as a soak pit or rubble pit, a soakaway is essentially a hole dug into the ground and filled with rubble to help percolate the water that comes through it back to the surrounding soil in an efficient way. 

Discharging downspout water flow in this manner helps to prevent rainwater run-off from entering the sewer main and overwhelming it. It also helps to keep your landscape intact when it rains hard.

Directly connected to a drainpipe leading to a stormwater drainage system

Here, all the water from your downspouts is diverted to local ponds, rivers, lakes and other waterways via a network of drainpipes buried outside your home. The stormwater drain that directs downspout water away from a home doesn't usually drain into the sewer system, to prevent untreated wastewater and sewage from polluting local water sources. 

Directly connected to a drainpipe that discharges into an underground sewer system

The water from rainwater downpipes can also be connected to a pipe that empties into the main sewer system, resulting in both wastewater and rainwater exiting your home through the same channel. This method of discharge works well for homes that are located in regions that don't receive much rain and, therefore, don't need to keep their wastewater drainage system separate from their stormwater drainage system.

Poor installation of rainwater downpipes can result in flooding issues and costly water damage to your home. To ensure the rainwater that runs off your roof is directed away from your house in an effective and efficient manner, make sure you enlist the help of a roof plumbing specialist when it is time to install your rain gutters and downspouts. They will assess your rainwater drainage needs and advice you on the best approach to diverting downspout water flow away from your property.