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[[File:David Elkin downspout disconnection to constructed stream channel.jpg|thumb|Downspout routed to an infiltration trench.]]
[[File:David Elkin downspout disconnection to constructed stream channel.jpg|thumb|Downspout routed to an [[infiltration trench]]. A decorative [[trench drains|trench drain]] cover is visible in the background.]]
Downspout disconnection programs are common in many older urban centers. They require that residents retroactively disconnect their downspouts from the municipal sewer system. This is due to older sewer systems being undersized for the combined flow of sanitary waste and stormwater.
Downspout disconnection programs are common in many older urban centers. They require that residents retroactively disconnect their downspouts from the municipal sewer system. This is due to older sewer systems being undersized for the combined flow of sanitary waste and stormwater. New projects should consider remaining independent of municipal storm sewers from the outset. To prevent [[flooding]] and achieve stormwater control, widespread use of small, site scale technologies such as downspout disconnection can reduce the size of shared LID installations.
New projects should consider remaining independent of municipal storm sewers from the outset. To prevent flooding and achieve stormwater control, widespread use of small, site scale technologies such as downspout disconnection can reduce the size of shared LID installations.
The [https://www.ontario.ca/laws/regulation/120332| Ontario Building Code] requires that: <br>
The Ontario Building Code<ref>Province of Ontario. (2018). O. Reg. 332/12: BUILDING CODE. Retrieved February 23, 2018, from https://www.ontario.ca/laws/regulation/120332</ref> requires that: <br>
"Where downspouts are provided and are not connected to a sewer, extensions shall be provided to carry rainwater away from the building in a manner that will prevent soil erosion."
"Where downspouts are provided and are not connected to a sewer, extensions shall be provided to carry rainwater away from the building in a manner that will prevent soil erosion."
{{textbox|1= Recommended strategies to receive downspout runoff include:
{{textbox|1= Recommended strategies to receive downspout runoff include:
*[[Rain gardens]]
*[[Rain gardens]]
*[[Infiltration trenches]]}}
*[[Infiltration trenches]]}}
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