Why does water come in from the ground during a storm?
Because the soil is saturated and the drains are full, so the water has nowhere to go but toward the building. It enters at the lowest opening it can reach.
When the soil has taken in a week of rain, it cannot absorb more, and the surface water runs toward the low points of the yard. A yard drain that is full or a grade that slopes toward the house sends that water to the foundation. The water stands and rises until it finds a threshold, a door or a slab edge, and then it enters. The lowest opening is the one most likely to fail, and it is the first one the crew checks.
Can the yard drain itself cause the problem?
Yes, when it is blocked, undersized for the rain or discharging against the house. A drain that does not empty leaves the water standing where it cannot be carried away.
A yard drain that is full of leaves, sand or silt stops working in a storm, and the water it should carry off stays on the surface. A downspout that dumps water against the foundation adds to the pond. The crew records these conditions, because they explain the entry. Changing the grade, clearing or replacing the drain and moving the downspout are for a landscaper or a drainage trade, and the homeowner decides when to do the work.
Is water from outside clean?
Not usually. Water that has crossed a yard picks up soil and debris, and its category is judged on site. It is treated as more serious than clean rain, especially if it has mixed with sewage.
Ground water and yard water carry soil, leaves and whatever the ground holds, and they can carry more if the drain has taken sewage. The category is judged by where the water came from and what it touched, and the cleanup follows that category. Porous materials that have taken the water are often removed, and hard surfaces are cleaned and dried. The homeowner is told which materials were removed and why.
What should a homeowner do while the yard is still full?
Keep the water away from the door with sandbags or a barrier if it is safe, move items up off the floor, and do not walk through standing water near the house.
A homeowner who sees the yard pond against the house can move stored goods to a higher shelf, lift the boxes and bins off the floor and place a barrier where the water is coming in. Do not enter standing water near the electrical side of the house, and turn off power at the panel if water reaches the outlets. The line is answered 24/7 on (833) 490-5225 for the water side of the call.
Will the next storm do the same?
It can, if the yard, the drain and the downspout are not changed. The crew's report on the outside shows which conditions are likely to repeat.
A yard that pooled once in a storm will pool again in the next heavy one, unless the grade, the drain or the downspout is changed. The homeowner should ask for the report and take it to a landscaper or a drainage trade. The water work does not change the yard, and it is the homeowner's decision to do the outside work.