Spring Snowmelt and Wet March Storms in Englewood Basements

Why spring snow is harder on basements than winter snow

Midwinter snow in the Denver area is often light and dry, and it tends to sublimate or melt slowly. Late-season storms are different. They can bring a foot or more of heavy, wet snow, followed quickly by sunny days in the fifties or sixties. All of that water releases over a few days instead of a few weeks.

Timing makes it worse. The top layer of soil may thaw before the ground underneath, so meltwater cannot soak down and instead runs sideways along the frozen layer, often toward the loose backfill next to a foundation. Gutters may still be packed with ice, so roof melt spills over the edge right beside the wall. Window wells fill with drifted snow that melts against the glass. And on older Englewood lots, where houses are close together, shaded side yards keep snow far longer than sunny front yards, feeding one wall with meltwater for days.

After a big spring snow

Shovel snow out of window wells, at least away from the glass, before the warm-up.
Clear snow away from the base of exterior walls on the shaded side of the house.
Knock ice out of downspout outlets so melt does not back up and spill over gutters.
Make sure downspout extensions that were removed for winter mowing or shoveling are back on.
Check the sump pit, if you have one, to confirm the pump runs and the discharge line is not frozen or buried under snow.
Walk the basement each morning during the thaw and look along the base of walls and under windows.
If seepage starts, note which wall and what the snow was doing outside that wall.

What spring seepage usually tells you

Seepage under one window: The well filled with melt; drainage or a cover is the likely fix
Seepage along a shaded wall: Persistent melt or snow piles beside it; regrading and snow management help
Seepage at downspout corners: Ice-blocked gutters or missing extensions
Seepage on every wall: Higher groundwater; a perimeter drain and sump may be worth investigating
Water from the floor drain: Not snowmelt seepage; possibly a sewer issue or groundwater entering the sewer line

General information for Englewood, not a quote or professional advice. In an emergency, call 911.