How to Plan Gutter and Downspout Drainage

What this guide helps you decide

Observe the property during a normal rain and photograph where each downspout discharges. Look for splashback on siding, eroded mulch, standing water and soggy soil at the foundation.

Start with the existing conditions

Plan a practical outlet route that does not block walkways or discharge onto a neighbor's property. Surface extensions and underground piping have different maintenance and clogging needs.

Plan materials, layout and access

Keep roof valleys and high-flow downspouts in mind when sizing any extension or splash block. Avoid creating a sealed connection that makes gutter cleaning and inspection impossible.

Check the result and plan follow-up

Recheck after a heavy storm and see whether the outlet remains clear and soil dries appropriately. Record where buried pipe runs for future landscaping.

Common mistakes to avoid

• Pointing runoff at the slab edge
• Burying pipes without cleanout access
• Creating a trip hazard across a walkway

Should you DIY or hire help?

Hire drainage or exterior-repair help for recurring standing water, erosion near structural supports or buried pipe modifications.

Keep planning with related guides

• Signs Water Is Getting Behind Exterior Siding
• Chimney Chase Caps and Water Entry: What to Look For