Originally published September 23, 2019. Updated October 2026.
Commercial hydroponic water systems often involve multiple designers, contractors, equipment manufacturers, controls providers, and specialty vendors. Each party may be responsible for one part of the system, but the facility owner still needs the complete water process to work as one integrated system.
An owner’s engineer provides independent technical support on behalf of the owner. For hydroponic and greenhouse water systems, that can mean defining requirements, reviewing proposed solutions, identifying gaps between disciplines, and helping verify that the completed system supports the owner’s operating objectives.
The role is especially valuable early in a project, before major equipment selections and construction decisions become difficult or expensive to change.
What Is an Owner’s Engineer?
An owner’s engineer is a technical advisor who represents the owner’s interests during project development and execution.
The owner’s engineer does not necessarily replace the project’s Engineer of Record, architect, general contractor, equipment vendors, or specialty designers. Instead, the role provides an independent technical perspective focused on whether the proposed system aligns with the owner’s requirements.
For Integrated Water Process, owner’s engineering is focused specifically on the water process, including source water, treatment, storage, pumping, fertigation, irrigation, controls, drainage, reclamation, and reuse.
Scope matters: The responsibilities of an owner’s engineer should be clearly defined by contract. Depending on the project, IWP may serve as an advisor, planner, designer, reviewer, commissioning resource, or a combination of these roles.
Why Hydroponic Projects Need Independent Water-System Review
A commercial hydroponic facility may include equipment and design input from several different organizations.
For example:
- A greenhouse supplier may define structural and environmental systems.
- An irrigation supplier may select valves and emitters.
- A fertigation vendor may provide dosing equipment.
- A water-treatment company may supply filtration or reverse osmosis.
- A controls provider may automate pumps, tanks, valves, and dosing equipment.
- A mechanical contractor may install piping and equipment.
- An electrical contractor may provide power and field wiring.
Each individual system can be appropriate on its own while still creating integration problems at the interfaces.
Owner’s engineering helps address the spaces between those scopes.
Start With the Owner’s Project Requirements
One of the most important early project tasks is defining what the water system actually needs to accomplish.
An Owner’s Project Requirements document, commonly shortened to OPR, establishes the performance expectations that should guide later design and equipment decisions.
For a commercial hydroponic water system, the OPR may define:
- Available source-water quantity and quality
- Peak and average irrigation demand
- Required irrigation pressure
- Storage-volume requirements
- Water-quality targets
- Filtration requirements
- Fertigation strategy
- pH and electrical conductivity targets
- Water-treatment requirements
- Drainage and recovery strategy
- Water-reuse objectives
- Required controls and alarms
- Redundancy requirements
- Maintenance expectations
- Future expansion requirements
Defining these requirements before equipment is selected gives the project team a common technical basis for decision-making.
Integrated Water Process develops these requirements through hydroponic grow system planning.
Review the Water Process Before Reviewing Individual Equipment
Equipment selection should follow the process requirements, not define them.
Before reviewing a pump, filter, tank, dosing system, or controller, the owner should understand how water is expected to move through the facility.
A typical water process may include:
- Source water
- Pre-treatment
- Water storage
- Filtration or treatment
- Fertigation
- Distribution pumping
- Irrigation
- Drainage
- Recovery and treatment
- Reuse or discharge
Reviewing the overall process first makes it easier to identify missing components, unnecessary complexity, hydraulic conflicts, or equipment that does not align with the intended operating strategy.
Technical Design Review
An owner’s engineer can provide an independent review of water-system design documents before construction.
Depending on project scope, the review may include:
- Process flow diagrams
- Piping and instrumentation diagrams
- Equipment schedules
- Pump selections
- Tank sizing
- Filtration criteria
- Water-treatment equipment
- Pipe sizing
- Flow and pressure calculations
- Valve selections
- Instrumentation
- Control sequences
- Alarm requirements
- Water-recovery systems
The purpose is not simply to identify drafting errors. The review should determine whether the proposed design supports the operating requirements established at the beginning of the project.
Equipment and Submittal Review
Commercial water systems often change between design and construction as equipment is purchased, substituted, or value-engineered.
Owner’s engineering can provide technical review of proposed equipment before those decisions become permanent.
Typical questions include:
- Does the pump meet the required flow and pressure?
- Is the filter appropriately sized for the expected solids load?
- Does the tank provide adequate usable volume?
- Can the treatment system support peak production demand?
- Does the control system receive the required sensor inputs?
- Can equipment be accessed for maintenance?
- Are required bypasses, isolation valves, drains, and sampling points included?
- Will the selected equipment integrate with the rest of the system?
These reviews can help identify incompatibilities before equipment reaches the jobsite.
Coordinate the Interfaces Between Systems
Many water-system problems occur at interfaces rather than within individual pieces of equipment.
Examples include:
- A treatment system that cannot refill storage quickly enough
- A pump that does not match actual irrigation-zone demand
- A fertigation system receiving unstable inlet pressure
- A control system missing a required level or pressure signal
- A filter creating more pressure loss than the pump design allows
- A reclaimed-water system that does not coordinate with irrigation demand
- Different equipment suppliers using incompatible control assumptions
The owner’s engineer can help identify these interfaces and establish responsibility for resolving them.
Support Procurement Without Letting Equipment Drive the Design
Equipment manufacturers and suppliers provide valuable technical expertise, but their responsibility is generally centered on the equipment they provide.
The owner still needs someone evaluating how those products fit into the complete process.
An independent water-system review can help compare proposed technologies using project-specific criteria such as:
- Required performance
- Capital cost
- Operating cost
- Maintenance requirements
- Controls integration
- Replacement parts
- Serviceability
- Redundancy
- Energy use
- Water efficiency
The objective is not to select the most complex equipment. It is to select equipment that solves the defined problem and fits the complete system.
Construction and Installation Support
Even a well-developed design requires field coordination.
Conditions encountered during construction can require adjustments to equipment locations, piping routes, valve arrangements, instrumentation, controls, or access requirements.
Owner’s engineering support during construction may include:
- Reviewing field conditions
- Responding to technical questions
- Reviewing proposed changes
- Coordinating equipment interfaces
- Reviewing installation progress
- Identifying deviations from the intended process
- Supporting startup planning
Field observations also provide valuable feedback to the design process. Installation, operation, and maintenance challenges can reveal opportunities to simplify and improve future systems.
Commissioning and Performance Verification
The owner’s requirements established at the beginning of the project should ultimately be verified in the field.
Commissioning provides that feedback loop.
Testing may include:
- Water flow
- Operating pressure
- Tank levels
- Pump performance
- Filter differential pressure
- Water-treatment operation
- Fertigation performance
- Sensor calibration
- Control sequences
- Alarm conditions
- Irrigation-zone performance
The results can then be compared with the original design criteria and Owner’s Project Requirements.
Learn more about hydroponic testing and commissioning.
Owner’s Engineer vs. Engineer of Record
The owner’s engineer and Engineer of Record may perform different roles.
The Engineer of Record is typically responsible for the engineering documents within a defined professional scope and may provide signed and sealed documents where required by applicable codes and regulations.
An owner’s engineer may instead provide independent planning, technical review, coordination, or advisory services on behalf of the owner.
On some projects, Integrated Water Process may also provide professional engineering design services within its contracted scope. The specific responsibilities should always be defined for the individual project.
Owner’s Engineer vs. Equipment Supplier
Equipment suppliers are an important source of product knowledge. They understand the capabilities, limitations, and application requirements of their own equipment.
An owner’s engineer has a different perspective.
The focus is not on selling a particular filter, pump, dosing system, controller, or treatment technology. The focus is on defining the owner’s requirements and determining how the different pieces fit into the complete water process.
This independent perspective can be particularly valuable when several suppliers are involved in the same project.
When Does Owner’s Engineering Add the Most Value?
Owner’s engineering can be useful at several points in a project, but the greatest opportunity to influence cost and system performance typically occurs before major equipment has been purchased.
Consider independent water-system support when:
- Developing a new commercial greenhouse or hydroponic facility
- Expanding an existing production facility
- Comparing competing equipment proposals
- Developing an Owner’s Project Requirements document
- Coordinating multiple water-system vendors
- Reviewing a proposed irrigation or treatment design
- Planning water reclamation or reuse
- Preparing for installation and commissioning
- Correcting an existing system that does not perform as intended
Total Water Management
Integrated Water Process approaches owner’s engineering through Total Water Management.
Rather than treating source water, treatment, storage, fertigation, irrigation, drainage, and reclamation as unrelated systems, we evaluate how water moves through the complete facility.
This provides a common technical framework for coordinating equipment suppliers, designers, installers, controls providers, and facility operators around the owner’s requirements.
Explore our hydroponic water engineering services and commercial water system solutions.
Need Independent Water-System Support?
If you are planning a commercial hydroponic or greenhouse project, Integrated Water Process can help define the water-system requirements, review proposed solutions, coordinate technical interfaces, and verify performance through commissioning.