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In commercial Swiss drain cleaning, CCTV sewer inspection, and trenchless pipe rehabilitation, maintaining property drainage networks represents the front line of groundwater protection. Defective sewer laterals exhibiting root ingress, structural cracks, or pipe joint displacement cause dangerous sewage exfiltration into potable water aquifers or clean stormwater infiltration into municipal treatment works. Service contractors must code visual defects under standard EN 13508-2, perform calibrated pressure testing under VSA protocols, and track vacuum extraction waste under statutory ADWO rules. A dedicated drainage software database connects pipe runs, video inspection files, and rehabilitation quotes into a unified sewer register.

1. Statutory Framework: Swiss Water Protection Act (GSchG), VSA Directives & SIA 190

Maintaining property and municipal drainage networks in Switzerland is governed by the Swiss Federal Water Protection Act (GSchG, SR 814.20 ), SIA Standard 190 (Sewer Systems) , and directives from the Swiss Water Association (VSA ):

  • Statutory Watertightness Mandate (Art. 15 GSchG): Property owners bear strict legal obligations to ensure private drainage networks remain watertight and fully operational.
  • General Drainage Master Plan (GEP) Compatibility: Inspection logs must adhere to the standardized VSA data structure (VSA-DSS) for seamless integration into municipal GIS databases.
  • Building Cost Code (BKP) Segregation: Itemised accounting under BKP 215 (Building Drainage), BKP 211.5 (External Site Drainage), and BKP 273 (Rehabilitation Works).
Mandatory Remediation for VSA Class 0/1: Where inspection reveals structural collapse risks (Class 0) or active exfiltration (Class 1), cantonal environmental authorities impose binding repair deadlines within months. The software generates the official defect survey for municipal building authorities.

2. CCTV Robotic Camera Inspection & Defect Coding under SN EN 13508-2 / VSA

Visual pipeline condition surveys follow standardized defect coding:

  1. Standardized Coding under SN EN 13508-2 with VSA Extensions: Official codes for cracks (BAB), deformations (BAF), root intrusion (BAJ), solid deposits (BAH), and defective connections (BAE).
  2. Classification into VSA Condition Classes:
    • Class 0 (Immediate Action Required): Imminent collapse hazard, total blockage.
    • Class 1 (Short-Term Action): Remediation required within 1 to 3 years.
    • Class 2 (Medium-Term Action): Remediation required within 4 to 10 years.
    • Class 3/4 (Acceptable Condition): Functionally sound pipe network.
    • Digital Pipe Run Files & Video Linking: Synchronizing MPEG inspection videos and high-resolution defect photos with chainage distances along the run.

3. Air and Hydrostatic Pressure Testing under SIA Standard 190 / VSA

Following new pipeline installation or relining, SIA Standard 190 requires instrumented proof testing:

  • Pneumatic Pressure Testing (Air Method LC / LD): Applying test pressure to isolated pipe sections (e.g., 200\ hPa) and monitoring pressure drop over a defined test window.
  • Hydrostatic Water Testing (Method W): Filling to manhole cover level (10\ to\ 50\ kPa) and measuring exact water top-up volumes (l/m2 of wetted internal area).
  • Automated Test Certificates: Calibrated digital test units transmit measurement curves via Bluetooth directly into certified PDF test certificates.

4. Trenchless Pipe Rehabilitation (CIPP Inliners, Patch Liners) & Robotic Milling

No-dig rehabilitation eliminates surface excavation across landscaped grounds and floor slabs:

  • Cured-in-Place Pipe (CIPP) Lining: Inverting resin-impregnated textile sleeves (epoxy resin, needle felt) cured with hot water, steam, or UV light; logging curing temperatures.
  • Localized Patch Lining (Shortliners): Installing fiberglass-resin patches on inflatable pneumatic packers to bridge isolated localized cracks.
  • Robotic Milling: Clearing heavy scale, roots, and concrete intrusions prior to relining, followed by remote robotic opening of lateral junction connections.

5. Environmental Vacuum Slurry & Sewer Silt Disposal under Swiss ADWO (VVEA)

Silt and debris extracted during jetting operations are governed by the Swiss Waste Ordinance (ADWO / VVEA, SR 814.600 ):

  • Catch Basin Silt & Oil Interceptor Waste: Separate classification of mineral street sweepings/silt (code 19 08 05) and hazardous oily separator sludge.
  • Digital Waste Tracking: Real-time transfer of waste consignment data to licensed processing plants and the FOEN electronic portal (veva-online.admin.ch).
  • Jetting Vehicle Invoicing: Itemised billing of combination vacuum-jetting trucks, water recycling units, and tip fees under Swiss NPK positions.

6. Statutory Framework and Official Resources