Roof runoff is a separate starting point.
A downspout can deliver a concentrated flow during a storm. Start by checking where it ends and how water travels after leaving it. Water released beside the foundation or onto a low surface may contribute to a problem elsewhere on the property.
DOE gutter and downspout guidance treats roof-water management as a system: collection, conveyance, a receiving area and any needed overflow. A buried line should be planned around those functions, not added because hiding the downspout looks tidier.
Solid pipe and perforated pipe are not interchangeable.
A solid conveyance pipe carries roof water through a route without intentionally collecting or releasing water along that section. A perforated drain collects water through its surroundings. Ask how the proposed connection affects the purpose and capacity of the drainage assembly.
Do not assume roof runoff should be connected to an existing foundation drain. The receiving system and its intended loading need to be evaluated.
Choose the receiving location before excavation.
A grassed area, an approved outlet, a designed infiltration facility or another receiving route can have different limitations. The site assessment should consider building proximity, runoff paths, neighboring property and public rights-of-way.
An infiltration arrangement needs appropriate soil and groundwater conditions. If water is stored or harvested, the design still needs to manage overflow. Permission for a public-system connection should be established separately.
Check the visible parts first.
- Look for leaves and debris at gutters, downspouts and safely accessible surface inlets.
- Observe the flow during rainfall from a safe position.
- Note whether water returns toward the house or crosses paving.
- Describe existing buried lines and any known outlet.
- Identify irrigation and other private underground lines before digging.
What to include in a quote request.
Describe the roof-water source, downspout locations and the area affected. Mention whether the proposed route crosses a lawn, bed, sidewalk or driveway. Ask who will handle utility locating, connection approval and restoration.
Avoid a universal distance or pipe-size recommendation. The system should fit the roof catchment, route, site and receiving conditions.