Pond Installation
& Surgical Dam Repair
Building a pond that holds water year-round requires precise soil hydrology, clay core keyways, and code-grade compaction. At Knights Construction and Supplies, we design, excavate, and repair agricultural livestock ponds, retention basins, and recreational lakes across Sanford, Pittsboro, and Central North Carolina.
Pond Capability Highlights
- Farm and agricultural livestock watering ponds
- Commercial HOA storm-water retention & detention basins
- Silt dredging, weed muck removal & depth deepening
- Dam stabilization, burrowing pest remediation & pipe repair
How We Build Ponds That Never Dry Up Or Breach
A hole in the ground filled with rainwater will quickly leak out without proper geotechnical soil analysis and a compacted clay core. Here is our exact construction protocol:
Soil Testing & Watershed Sizing
We evaluate watershed acreage (typically 3 to 5 acres of runoff per acre-foot of pond) and perform test pits to verify sufficient plastic clay content (minimum 20% clay) before digging begins.
Clay Core Cutoff Trench (Keyway)
We dig a trench along the centerline of the dam through permeable sand/gravel down to solid impervious clay bedrock. This is backfilled with select clay in compacted 6" lifts to stop subsurface leaks.
3:1 Slope & Embankment Compaction
Sides and interior banks are graded to a safe 3:1 slope to prevent wave erosion, soil sloughing, and safety hazards. Dams are crowned at a minimum 10 to 12 foot top width for vehicle access.
Dual-Stage Overflow Drainage
Every pond includes a primary mechanical drop-inlet riser pipe with anti-seep collars, paired with an emergency vegetated or riprap-lined overflow spillway to safely bypass catastrophic flash floods.
Is Your Existing Pond Leaking Or Silted In?
Ponds lose water for three main reasons: a failed pipe collar, animal burrows piercing the dam, or sand seams in the basin. We provide targeted remediation without needlessly bulldozing your entire landscape.
Sodium Bentonite Sealing
High-swelling volcanic bentonite is tilled into permeable basin soils and rolled to form an impenetrable impermeable membrane.
Silt Dredging & Cleanout
Long-reach excavators excavate accumulated black anaerobic muck, restoring original depth, cool water temperatures, and fish habitat.
Overflow Pipe Replacement
Corroded metal corrugated pipes cause dam sinkholes. We replace them with heavy-wall smooth interior HDPE pipes and welded seepage collars.
Riprap Embankment Armor
Heavy Class A and Class B granite riprap stone stabilizes steep banks and wave-impact shorelines from erosion.
Common Warning Signs
Our operator will evaluate your dam elevation, spillway geometry, and soil composition directly on your property.
Recent Central NC Pond Projects
Real photography from completed ponds, dam repairs, and excavation projects constructed by Knights Construction and Supplies across Lee, Chatham, and Moore counties.
Finished Project
Private Farm Pond & Dock
Deep water basin excavation with stabilized shoreline, engineered overflow, and custom wooden fishing dock.
Earthwork Phase
Clay Keyway & Basin Cut
Excavating deep sub-basin in native Cecil clay, keying in embankment core to prevent subterranean seepage.
Recreation
Acreage Recreational Pond
Full-volume water retention with graded turf banks, riprap inflow filtration, and crystal clear water.
Agricultural
Agricultural Retention Pond
Multi-purpose farm watering basin with reinforced dam embankment and secondary emergency storm spillway.
Ready To Excavate Your Pond Or Fix A Leaking Dam?
Speak directly with our excavation specialists. We provide transparent estimates, accurate laser grading, and heavy machine power to get your project done right.