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The check valve on a sump pump should be low to the ground to cut down on the amount of water that could drain back into the pit after the pumping cycle is over. Any drainage professional will check that the valve is in the proper location as this can be a major factor in ensuring your basement stays dry.
However, some sump pump’s check valve can be installed inside of unit itself, but the installation and maintenance would considerably more complicated. Just be aware of that issue if you are purchasing a new sump pump or talk with your contractor to ensure you get what you need.
It’s also important to make sure the sump pump has a backup power supply other than the electrical cord. Power outages during severe weather pose an inconvenience that could result in disaster for basement floods. If you lose power to your home during a heavy rainstorm, the motor on the sump pump will stop, and the water level in your basement will rise. It is always wise to install a sump pump battery back up to prevent flooding.
Another consideration when selecting the right pump is the size and depth of the pit it sits in. Standard sump pits are 24” deep, but quickly overflow in heavy rainstorms because the pump can’t remove water fast enough. Some experts believe a wider pit is better because it gives the pump time to turn on and off. A sump pump can go into overload and burn out the motor if it doesn’t have time to rest between pumping cycles. It’s important to make sure the pit is wide and deep enough. A good contractor can recommend the best size for the sump pit.