What type of roof drain allows for adjustable flow?

An adjustable-flow roof drain is designed to control the amount of water that is allowed to flow through it, which can be particularly useful in managing drainage during varying rainfall conditions. The adjustability feature allows for manual or automatic alterations to the flow rate, depending on the needs of the specific installation and the water volume being managed.

These drains typically feature mechanisms, such as adjustable weirs or gates, that can be modified to either restrict or enhance the flow of water, providing flexibility in drainage capacity. This is crucial in preventing overflow during heavy rain while also ensuring that water is properly channeled away from the roof structure at lighter rainfalls.

The ability to adjust the flow not only aids in effective drainage but can also be significant in maintaining the integrity of roofing systems by reducing the likelihood of pooling water, which can contribute to leaks, structural damage, or increased wear and tear over time.