Drainage Services In Lebanon,New Hampshir
Why Trust Our Drainage Services in Lebanon, NH?
Lebanon’s drainage problems don’t come from one source. They come from three working together.
Glacial till is the soil under most Lebanon properties — compacted, stony, low-permeability ground that doesn’t absorb water the way people expect. When rain or snowmelt hits it, water perches on top or moves laterally to wherever the slope takes it — often toward foundations and low spots that collect water until conditions dry out on their own.
Frost heave compounds this. Older Lebanon properties have had their grades shifted over many winters — low spots develop where none existed at construction, and water that used to drain now sits. The City of Lebanon’s own flood awareness program places drainage responsibility directly on property owners — the city participates in NFIP and makes clear that managing water around residential properties is not the city’s job.
Then there’s the river exposure. Properties near the Mascoma River corridor through downtown and along the Connecticut River in West Lebanon sit in documented flood risk zones where seasonal high water affects what drainage solutions can reliably discharge.
Murphy & Son has three generations of New Hampshire construction experience. We know what Lebanon’s ground and its rivers do to drainage systems — and how to build ones that hold up through both.
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Client Experiences with Our
drainage Services in Lebanon
Services We Provide
Driveway Grading and Roads
Bridges
Demolition
Equestrian Riding Construction
Foundation Excavation
Utility Excavation
What Makes Our Drainage Services in Lebanon Efficient and Reliable?
The most common drainage failure in Lebanon isn’t the wrong product — it’s the wrong diagnosis.
French drains don’t fix grading problems. Regrading doesn’t fix a perched water table on glacial till. A catch basin with a discharge line that backs up during Mascoma or Connecticut River high water in April doesn’t drain anything when it’s needed most. Getting the source right before specifying the solution is what separates a system that works from one that works most of the time.
Every job starts with a site assessment — soil condition, slope, frost depth exposure, and proximity to Lebanon’s flood risk zones. Solution selection follows the diagnosis: French drains for subsurface saturation, swales and regrading where surface grade is the issue, culverts at crossings that flood, catch basins at collection points.
Installation goes below New Hampshire’s frost line — pipe above that depth freezes and backs up through the months Lebanon needs drainage most.
Outlet location and elevation are verified before the trench closes. A discharge point that functions in summer but floods out during April snowmelt is half a drainage system. We build the whole one.
Case Studies
A Lebanon homeowner near the Mascoma River corridor called after persistent foundation moisture every spring — glacial till perching water laterally toward the basement on the uphill side, compounded by proximity to the Mascoma’s high water period. We assessed the slope and flood zone elevation, installed a perimeter French drain below frost depth, and routed the outlet to a discharge point clear of seasonal high water. Foundation moisture resolved through the following snowmelt season.
A West Lebanon homeowner near the I-89 corridor had a rear yard that stayed saturated from snowmelt through June — glacial till with no viable outlet and frost heave had created a low spot over several winters. We regraded the grade to eliminate the depression, installed a subsurface drain tied to a culvert outlet at the property edge. Yard drained within days of installation and held through the following spring.
RECENT PROJECTS
Take a look at some of our most recent work across land clearing, grading, demolition, and full site preparation in Brownsville. Our team handles every phase of the job with precision and care from clearing brush and debris to preparing sites for new construction.
FAQs About Our Drainage Services In Lebanon
My Lebanon yard stays wet all spring — is that a French drain or a grading problem on glacial till?
Often both. Till perches water; frost heave creates low spots over time. We assess which factor dominates on your site before recommending anything — wrong solution wastes money and leaves the problem.
Does living near the Mascoma River affect what drainage options work on my property?
Yes. Flood zone proximity limits viable discharge elevations — a system that drains in summer can back up during Mascoma high water in April. We design outlets around Lebanon’s actual seasonal water levels.
How deep do drainage systems need to be in Lebanon to work through NH winters?
Below frost depth — typically 4 feet or more in Grafton County. Pipe above that freezes and backs up during the months Lebanon needs drainage most. Every system we install is designed for year-round function.
Do you serve West Lebanon and properties near the Connecticut River corridor?
Yes. We work throughout Lebanon, West Lebanon, and the Connecticut River and Mascoma River corridors — flood zone properties included. Outlet design accounts for river elevation during spring high water periods.
Can Murphy & Son handle both surface grading and subsurface drainage in one project?
Yes. Both are often needed together on Lebanon’s glacial till — surface grade correction and subsurface drainage installed in the correct sequence, by one crew, without handoffs between separate contractors.