How Sump Pumps Work When Heavy Downpours Hit

A sump pump installation in Sarasota, FL gives that water an escape route. The system collects groundwater in a sump pit and moves it away from the building before flooding can damage floors, walls, belongings, equipment, or the foundation.

That sounds simple, but the details matter. Correct placement, proper drainage, and a dependable check valve all help the system respond when heavy rain puts pressure on the property.

In this brief article brought to you by Mr. Rooter Plumbing, we shed light on how sump pumps are meant to work. If you’d rather consult a trained plumber, then contact the pros at Mr. Rooter.

What Happens Underground During a Heavy Downpour?

Rainfall does more than create puddles on the surface. Water also soaks into the soil surrounding a building, and, during a prolonged storm, saturated soil can push groundwater toward the foundation.

As groundwater accumulates around the foundation, hydrostatic pressure builds, and that pressure pushes water through any available gap. Water does not need a large opening to enter. Given sufficient pressure and time, it finds its way through gaps that appear completely sealed under normal conditions.

A sump pump system works by collecting that groundwater before hydrostatic pressure builds high enough to push it into the building.

The Sump Pit: Where the System Starts

The sump pit is a cylindrical basin installed at the lowest point of the basement or crawl space floor. Perforated walls allow groundwater in the surrounding soil to flow into the pit naturally. As groundwater rises around the foundation during a storm event, it flows through those perforations and collects in the pit.

Getting the pit placement right matters considerably. A pit positioned at the genuine low point of the floor collects water effectively. A pit positioned slightly off that low point leaves some groundwater to find its own path.

This is why getting the sump pump installation right is so fundamental. A pit in the wrong location undermines the entire system's effectiveness regardless of how well the pump itself performs.

How the Pump Activates and Moves Water Out

Most residential and commercial sump pumps use a float switch to trigger the unit. When the water level reaches a threshold, the pump motor activates, draws water through the intake at the base of the unit, and forces it through the discharge pipe that runs up and out of the pit toward the exterior of the building.

Discharge point selection matters as much as any other component of the system. A discharge pipe that terminates too close to the foundation recirculates groundwater back into the soil the system is trying to drain.

The Check Valve: Preventing Backflow

Every properly installed sump pump system includes a check valve on the discharge pipe above the pump unit. This one-way valve allows pumped water to flow up and out through the discharge pipe while preventing it from flowing back down into the pit.

Without a functional check valve, the water in the discharge pipe above the pump flows back into the pit every time the motor shuts off. The pump motor must then restart and pump that same water out again before it can begin addressing the new groundwater entering the pit.

We Handle Installs and Repairs

Whether you need a new unit installed or are looking for urgent plumbing repair service on an existing unit, the uniformed plumbers at Mr. Rooter are here to help.

Mr. Rooter is a licensed and insured company, and we are proud to serve homeowners and businesses alike. Call us today to hire a residential or commercial plumber.