Pipelines & Tunnels

ASSIST Consultants Inc. (ACI) provides world-class pipeline and tunnel engineering services to clients. We are a recognized leader in pipeline and tunnel planning, design and construction. Our services focus on the core areas of water and wastewater infrastructure, including pipelines, pumping stations, tunnels, canals and reservoirs.

Pipelines and Conveyance

Our conveyance services for our water and wastewater clients include feasibility analyses, alignment evaluations, energy and efficiency management and design of pipelines, tunnels, canals, pumping stations and storage reservoirs. With our extensive conveyance experience, transmission lines and aqueducts by Engineering News-Record.

Tunnels and Underground StructuresFor more than a decade, ASSIST Consultants Inc. (ACI) has been involved in investigating, planning, designing and constructing underground and trenchless projects. We use proven underground design and construction techniques for water and wastewater conveyance; and hydroelectric, dam and mining infrastructure and underground projects.

Our comprehensive underground engineering services include:

Regulatory Requirements, Planning and Permitting

Ensuring project success through effective and efficient project planning, adherence to regulatory requirements and permitting, including:

  • Water, wastewater and stormwater system master planning
  • Environmental planning, permitting and compliance
  • Route evaluation studies
  • Public outreach and stakeholder facilitation

Condition Assessment and Rehabilitation

As aging infrastructure continues to impact our clients, ASSIST Consultants Inc. (ACI) experts assess the condition of pipelines and tunnel projects and provide innovative rehabilitation solutions, including:

  • Trenchless technologies
  • Pipeline assessment and forensic engineering
  • Asset management services
  • Life cycle analyses


We have extensive experience in the design of hydraulic structures and specialized fluid flow analysis, integrating our hydraulic and underground engineering expertise to optimize projects for size, cost and maintenance, including:

  • Planning and design of hydraulic structures
  • Specialized fluid flow analyses
  • Hydraulic and transient analysis software

Our multi-disciplinary design team blends expertise and proven reputation for innovative, quality design for underground engineering projects, with services including:

  • Civil, electrical, mechanical, geotechnical and architectural engineering and design
  • Technical, economic and financial feasibility studies
  • Hydraulic model studies
  • 3D Modeling
  • Tunnel engineering
  • Trenchless technology
  • Geotechnical investigations
  •  Design of pumping stations, excavation support, gates and valves
  • Design review
  • Value engineering

Construction and Construction Management

We offer a full range of high-value, “start-to-finish” pre-construction, construction and construction management services including:

  • Constructability reviews
  • Risk and claims management
  • Cost estimating
  • Equipment factory inspection and testing

Power Delivery

ASSIST Consultants Inc. (ACI) provides leading hydropower engineering, design and construction services for building and upgrading substation and transmission lines safely, efficiently and effectively. We have designed and constructed the interconnection of major parts of the Afghanistan National Grid including the Northern Electrical Transmission System (NEPS) and Southern Electrical Transmission System (SEPS) and other projects.

ASSIST Consultants Inc. (ACI) offers a full range of services for electrical transmission and distribution projects. We provide single-source responsibility for successful hydropower project development and implementation, interconnection for new lines, upgrades and rehabilitation

Program Management:

ASSIST Consultants Inc. (ACI) experts have a proven track record of providing program management services for complex power delivery programs, including:

  • Asset management
  • Asset optimization
  • System expansion and rehabilitation project prioritization
  • Project scheduling and resource leveling
  • Risk mitigation and management
  • Cost forecasting and budget management