UKWIR / OFWAT Acoustic Leak Report Form
Common Leakage Methodology (CLM) Data Collection Standard.
1. Metadata & Utility Details
Water Company
DMA Name / Code
Contract Reference
Technician Name
Technician Licence No
2. Site & Network Identification
Street Location
Postcode
Grid Reference / W3W
Pipe Material
Pipe Diameter (mm)
Operating Pressure (bar)
Upstream Fitting Ref
Downstream Fitting Ref
3. Equipment & Acoustic Survey Findings
Acoustic Device Type
Sensor Spacing (m)
Velocity of Sound (m/s)
Background Noise (dB)
Leak Detected?
Est. Leak Position (m)
Coherence Level (%)
Peak Frequency (Hz)
4. Verification & Excavation Data
Recommended Action
Est. Leak Rate (Liters/Hour)
Analyst Notes
Clean correlation peak centered at 58.4m from upstream hydrant HYD-5542-SG. Distinct hiss frequency characteristic of a split MDPE ferrule or small pinhole fracture.
5. Photo Evidence (Min 2 items)
Upload minimum 2 evidentiary photos
6. Regulatory Sign-Off
Surveyor Name
Acceptance Status
Surveyor Signature
Clear Signature
Save Acoustic Report (Online / Offline)