Water and Wastewater Infrastructure

The U.S. water and wastewater infrastructure is under great pressure as the need for widespread renovation or replacement of aging facilities exceeds the available funding. Innovative, cost-effective remedies are in high demand, and Schnabel is recognized as a reliable provider of such solutions. Our domain is in the geoengineering aspects of planning, designing, and constructing water and wastewater facilities of all types. We provide geotechnical investigations and analyses, geostructural design, tunnel engineering, risk management, and construction support services.

Underground conditions represent a substantial portion of the unknowns and risks associated with water and wastewater infrastructure projects. Schnabel’s specialty is characterizing those conditions and providing insight into the best designs and construction techniques to accommodate them.

Our engineering solutions for water and wastewater projects include:


  • Geotechnical exploration and laboratory testing programs
  • Structural geologic mapping
  • Soil and rock mechanics analysis
  • Slope stability analysis
  • Seismic analysis and design
  • Geotechnical instrumentation and monitoring

Geostructural Design

  • Tieback and anchor design
  • Micropile design
  • Soil nail wall design
  • Stone column design
  • Foundation design

Hydraulic Design

  • Spillways and energy dissipation structures
  • Water and wastewater treatment facilities
  • Stream restoration
  • Outfall design
  • 1-D and 2-D hydraulic modeling
  • Computational fluid dynamics
  • Transient analyses
  • FEMA floodplain analyses

Tunnel Engineering

  • Siting and feasibility studies
  • Ground support design for tunnels and shafts
  • SEM/NATM tunnel design
  • Precast concrete segmental lining design
  • Grouting and ground improvement design
  • Trenchless technology
  • Preparation of contract documents (plans, specs, GDMs and GBRs)

Constructability & Cost Estimating

  • Evaluation of designs for constructability based on experience of in-house contractors
  • Cost estimates at all project development stages (e.g. conceptual, final, etc.)
  • Probabilistic Cost Assessment (w/ Confidence Intervals)
  • Bid-Check Estimates (in HCSS format)

Risk Management

  • Risk register development
  • Qualitative risk analysis
  • Mitigation measure tracking and verification
  • Probabilistic quantitative analyses of cost and schedule impacts
  • Budget and schedule contingency analysis

Construction Engineering

  • Hydrogeologic site evaluations
  • Groundwater modeling
  • Aquifer testing
  • Geochemistry evaluations

Construction Management

  • Contract management
  • Construction inspection
  • Resident engineer services
  • Submittal review
  • Construction claims analysis