Groundwater Monitoring Camera Geotech Borehole Camera

GYGD-IV Rotary Borehole Inspection Camera: Diagnosing and Treating Well Performance Decline

Water well yield declines over time due to scale buildup, biofouling, sediment accumulation, and screen damage. Restoring yield without knowing the specific cause is costly and often ineffective. The GYGD-IV Rotary Borehole Inspection Camera provides a pre‑rehabilitation diagnosis that identifies the exact cause of decline, and a post‑rehabilitation verification that confirms treatment success. For water well contractors, pump installers, and municipal water utilities, this camera turns rehabilitation from guesswork into science.

Pre‑Rehabilitation Diagnosis
Before any treatment, the GYGD-IV descends the well to document:

• Scale type and distribution (calcium carbonate, iron, manganese, silica)

• Biofilm presence and extent (slime‑forming bacteria, iron bacteria)

• Sediment level and composition (sand, silt, gravel)

• Screen condition (open area remaining, mechanical damage)

• Casing integrity (holes, cracks, corrosion)

This diagnostic inspection provides objective evidence for the rehabilitation plan. For example, a well with iron bacteria biofilm requires a different treatment (biocide + dispersant) than a well with hard calcite scale (acid + mechanical cleaning). The camera prevents wasted effort on inappropriate treatments.

Treatment Design and Chemical Selection
The GYGD-IV’s high‑resolution images and optional pH‑conductivity‑temperature module help the contractor select the right chemicals and concentrations. A scale that is thin and porous may respond to mild acid, while thick, dense scale may require a stronger formulation. The depth‑referenced images ensure that the chemical is applied precisely where needed, minimizing chemical use and environmental impact.

Real‑Time Treatment Monitoring
During mechanical cleaning (brushing, jetting, air‑lifting), the GYGD-IV can be run intermittently to monitor progress. The operator can see scale being removed, sediment being displaced, and biofilm being stripped. If a particular interval is not responding, the treatment can be adjusted immediately, rather than waiting until the end of the job.

Post‑Rehabilitation Verification
After treatment, the GYGD-IV performs a final inspection to confirm:

• All target scale/biofilm has been removed

• The screen is fully open and functional

• The casing is free of damage from cleaning tools

• The well is ready for pump installation and production testing

The before‑and‑after video report is powerful marketing material: the client can see exactly what was done and the improvement achieved.

Yield Increase Quantification
By comparing pre‑ and post‑rehabilitation videos, the GYGD-IV provides a visual estimate of the increase in effective open area (screen porosity). This can be correlated with pump test results to show the specific contribution of the rehabilitation to yield improvement. This data justifies the cost of the rehabilitation and builds trust with clients.

Table: Well Rehabilitation Specifications