How to book a downspout flush
If the trough looks clear but the water still goes over the edge, the blockage is lower down. Here is how to ask for the right fix.

Describe the symptom, not just the service
We can quote more accurately when we know what you have seen. Useful details: which downspout is involved, whether water pours over the lip during a normal storm, and whether the pipe stays wet for hours afterward.
Say if the downspout runs into an underground pipe or discharges onto the lawn. A surface discharge is easy to flush. A buried connection may be a different job, and any good company will tell you so rather than quote a flat fee for work that turns out to be something else.
What the visit usually looks like
The usual method is simple. Water runs from the top, or air or a hose is pushed through from below, while someone watches for flow at the exit. If needed, the lower elbow comes off to remove a plug.
Ask whether a flush covers every downspout or just the one you named. On a house with several, a single clogged outlet often has company, and a combined visit may cost less than a return trip.
The same appointment is a good time to add the clean-out itself, so one visit covers the whole path from roof edge to discharge point.
Where the discharge ends up
Most of the city drains to the Howell Branch basin through a network the city describes as 2,300 inlets and 46 miles of pipe, according to its stormwater division. The debris pulled from your pipe should not be rinsed into that system.
Ask any company how it handles the material it flushes out, and whether it will tell you if the downspout discharges too close to the foundation. That second note costs nothing to mention and is worth having.
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