Serving Manchester
Groundwater & Basement Water Intrusion in Manchester, NH
Basement seepage, failed sumps, and hydrostatic pressure against the foundation are extracted and dried, and the path from the ground is identified so the loss does not repeat. Groundwater and basement seepage are extracted and dried only after the path from the soil is identified — a wall, a slab, a drain, or a failed sump. Drying the interior without stopping that path returns the same water to the same floor.
Frequently asked questions
The canals here were built for the mills.
They were, cut on several levels to drive one of the largest mill complexes anywhere, and parts of that system remain in the ground beneath the city. Where they run they carry water at engineered levels rather than natural ones, and some reaches are now buried. They do not behave like streams and the mapping for them is historic.
What happens here in the spring?
The catchment upstream is large and northern and holds a great deal of snow through the winter. When it releases the river rises steadily over days and stays up rather than spiking, and rain falling on top of the melt compounds it. It is a sustained load rather than a single event, and it affects different ground than a summer storm.
Only the bottom few blocks ever take water.
That is the shape of the city working as expected. Ground rising steeply from the river concentrates everything falling on it into the blocks at the bottom, which are also the blocks closest to the water. Those streets receive the runoff from above and have the least fall available to get rid of it.
The same questions, in context, on the Manchester mold removal page.