The builder of our house ran the roof gutter downspouts into 4 inch landscaping hose which is buried underneath the sidewalk and yard and drains into a culvert about 50 ft away. In the winter, the water melting off the roof runs into the hose and freezes. During the spring rains, the hose overflows (because it's frozen) and saturates the soil next to the house foundation causing water to enter the basement through the wall/floor interface. Any ideas on how to keep these hoses from freezing? I've thought of gutter heaters but didn't know if they can be submerged in water for long periods of time. Can a gutter heater provide enough heat to keep a 4 inch pvc pipe open? Can a heater be used in PVC?