Urban supply systems

Service Specifications for Urban Water Supply Systems

Urban water supply systems require pipelines that are safe, stable, and have minimal impact on the surface, especially in established urban areas. Trenchless technologies allow for the installation of pressure pipes and deep pipelines with controlled alignment and hydraulic continuity. This service is defined by the following technical parameters:

• Main applications: Installation of drinking water pipelines, main distribution lines, reinforcement branches, connections between reservoirs, underpasses beneath avenues, crossings beneath infrastructure, and renovation of water supply networks without interrupting service.

• Construction methods used: Remote-controlled microtunneling, pipe jacking, Direct Pipe®, and horizontal directional drilling (HDD), selected based on geotechnical conditions, operating pressure, alignment, and urban environmental constraints.

• Pipe diameters and types: Pipes made of steel, ductile iron, concrete, or specialized materials for pressurized systems. The choice depends on the hydraulic capacity, external loads, and the municipal operator’s standards.

• Soil conditions and water table: Suitable for cohesive, mixed, sandy, or saturated soils. In areas with groundwater or a risk of soil decompression, pressurized shields (EPB or Slurry) are used to ensure stability at the cutting face.

• Lengths and geometry of the intersections: Short and medium-length sections under streets or industrial areas; longer crossings under linear infrastructure; the possibility of gently curving alignments when the method allows (HDD or specific microtunneling solutions).

• Civil works prerequisites: Access pits, work platforms, access points, storage areas for piping and equipment, and space for a sludge treatment plant and auxiliary machinery.

• Compatibility with service continuity: Trenchless technologies allow new pipelines to be installed without interrupting the existing water supply, thereby reducing water outages, traffic disruptions, and inconvenience to residents.

• Quality Control and Hydraulic Parameters: Verification of alignment, front pressure, thrusts, excavated volume, pipe integrity, and leak tests. For pressurized pipelines, specific tests are performed in accordance with the operator’s regulations.

• Safety and the Urban Environment: Access management, vibration control, signage, ventilation in shafts, minimization of noise impact, and compliance with HSE protocols in urban environments and confined spaces.