Maintaining Exterior Drains: What You Need to Know

Table of Contents

    It’s completely normal and expected that exterior drains—such as patio slot drains, channel drains, and buried downspout lines—require maintenance over time. These systems are designed to handle water efficiently, but exposure to the elements means debris like leaves, dirt, and sediment can accumulate. The frequency of cleaning depends on several factors, including:

    • Surrounding Landscape: Properties with heavy tree coverage or plants near drainage areas typically need more frequent attention.

    • Storm Events: Heavy rain can wash soil, mulch, and other debris into drains.

    • Seasonal Fluctuations: Fall leaves or spring blooms often increase debris levels.

    Key Sign to Watch For:
    Any time you notice slow draining or water pooling near the slot drain, channel drain, or downspout outlet, it’s a clear signal that debris needs to be cleared to keep the system functioning properly.

    DIY vs. Professional Help

    We’re offering a simple process for maintaining your drains yourself, but you can always choose to contact a professional—such as a plumber or a qualified handyman—to clear the lines if you prefer.


    Care Program for Drains and Downspouts

    This guide covers both patio drains (slot or channel drains) and buried downspout lines. For buried downspouts, prevention is critical: make sure your gutters stay clear so debris doesn’t enter the system and cause downstream blockages.


    Step 1: Routine Visual Check

    • Look for debris around the slot opening, channel grate, or downspout pop-up emitter.

    • After heavy storms or seasonal changes, do a quick inspection.


    Step 2: Quick Maintenance Cleaning

    1. Clear Surface Debris

      • Use a stiff broom or a leaf blower to remove leaves and dirt from the drain opening.

    2. Flush with Water

      • Insert a garden hose into the slot or downspout entry.

      • Run water at high pressure to push loose debris through the system.

      • For buried downspouts, confirm water is flowing out of the outlet or pop-up emitter.


    Step 3: Deep Cleaning (When Drains Slow or Annually)

    1. Access the Channel

      • Lift the grates on channel drains using a grate tool or screwdriver.

      • For buried downspouts, check access points at the gutter or clean-out cap.

    2. Remove Debris

      • Use a wet/dry shop vac to suck out dirt, leaves, and sediment.

      • Scoop large clogs manually with a trowel or gutter scoop.

    3. Power Flush

      • Use a pressure washer with a drain-cleaning attachment or nozzle to blast away buildup.

      • Always flush toward the outlet.

    4. Check the Outlet

      • Ensure water exits freely.

      • If clogged downstream, a drain auger (snake) may be necessary.


    Prevention Tips

    • Gutters: Keep gutters clear to prevent debris from entering buried downspouts.

    • Leaf Guards: Consider gutter guards or leaf screens for added protection.

    • Regular Schedule: Quick clean every 1–2 months, deep clean at least once a year or after major storms.

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    About The Author

    Robyn is a 2009 graduate of the Kansas State University Department of Horticulture. She grew up in Southeast Kansas and graduated from Humboldt High School. While at K-State, she was a Leadership Scholar and served as President of the Horticulture Club.
    Robyn married Bret in 2009, and together they share a daughter, Ellie, born in 2021. Their family also includes three beloved adopted dogs.
    Robyn enjoys leading the High Prairie Outdoors + Pools team, where she blends her love of horticulture with Bret’s expertise as a certified pool builder and general contractor. Together, they’ve grown High Prairie into one of the only pool companies in Kansas City that offers a truly full-service experience with in-house design, landscaping, and pool construction.

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