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Operating and lab data
Flows, loads, diurnal and seasonal patterns, influent and effluent quality, energy and chemical use, residuals and relevant records for the streams within scope.
Design & Sourcing › Baseline Diagnostics & Planning
Baseline Diagnostics & Planning
Understanding the conditions the project must address
Reliable process design and equipment decisions depend on a clear understanding of the water or waste stream, how conditions vary and how the site operates. We review operating data, sampling results, existing assets, current practices and site constraints to define the flows, loads, variability and assumptions relevant to the assignment.
The work may establish a new baseline, strengthen an existing one or resolve a defined information gap within an active project. Where information is incomplete or inconsistent, focused checks are defined around the technical decisions they need to support.
Project information basisWorking flow and load rangesConstraints and connectionsTargeted information planAssumptions and review points
Key outputs
- Design information basis with defined flows, loads and operating ranges
- Targeted sampling and monitoring plan linked to design decisions
- Constraints and connections record covering space, utilities, access and outages
- Assumptions and information gaps with responsibilities and review points
When this work is relevant
- New project with limited or unverified information
- Operating plant with inconsistent data or performance records
- Existing studies or drawings that require reconciliation
- Design, procurement or delivery work relying on different assumptions
PROJECT BASIS
From project information to a defined basis
The work brings sampling results, operating records, site constraints and existing technical information into one controlled basis for the work that follows. It defines the conditions the project must address rather than relying on isolated values or unrecorded assumptions.
DEFINE operating and load ranges
RECORD constraints + assumptions
TARGET checks that affect design
ALIGN information + later verification
What must be resolved
Available information may be incomplete, inconsistent or based on conditions that no longer represent the project. These differences must be resolved before requirements and design decisions are confirmed.
What the basis records
- Operating ranges: expected, peak, upset and seasonal conditions.
- Constraints: space, hydraulics, utilities, connections, access and outages.
- Information plan: sampling, records, drawings and operator input linked to defined decisions.
How this supports the project
Designers, suppliers and the appointed project team can then develop and review their work against a consistent technical basis.
How EnWater supports the work
EnWater develops and documents the process information basis, including load cases, critical constraints, assumptions, material information gaps and the checks needed before requirements and design decisions are confirmed. The agreed assignment identifies how this basis will be used by the client, consultant, EPC, OEM, suppliers and contractors.
Stream view
See what the design basis needs to establish for each stream
The required information depends on the stream and the decisions that follow. This view shows the operating, quality and site conditions that need to be confirmed before requirements, process design and equipment duties are developed.
Select a stream to see how the information focus changes.
Preview
Influent / raw wastewater baseline
Define the flow, load, quality and hydraulic conditions that later sizing, controls and resilience provisions must address.
Sampling planProcess rangeSite constraints
What we focus on
- Daily, weekly and seasonal variability
- Shock loads, inhibitory constituents and upstream events
- Hydraulic conditions, bypasses and return flows
- Operator practices, access and monitoring limitations
Checks and control focus
- Sampling history, methods and data quality
- Outlier treatment for storms, cleaning or production events
- Assumptions and material information gaps
- Baseline indicators linked to later requirements and design
Typical outputs
Defined influent basis, working ranges, assumptions register and targeted information plan.
Preview
Treated effluent / reuse feed baseline
Confirm the quality, variability, storage and distribution conditions of the treated-water stream so the next page can define the receiving duty, monitoring and reliability requirements.
Reuse intentStabilityAesthetics
What we focus on
- Historical quality and stability
- Seasonal and temperature effects
- Turbidity, colour and other relevant quality drivers
- Storage, distribution and return conditions
Checks and control focus
- Available microbiological and compliance records
- Monitoring locations and data frequency
- Current operating controls and fallback arrangements
- Information needed to define the intended reuse duty
Typical outputs
Treated-water baseline, variability record and information plan for defining reuse requirements.
Preview
Sludge / biosolids baseline
Define sludge production, characteristics, stabilisation status and handling constraints so solids duties and route requirements are based on actual material conditions.
StabilisationDewateringReuse routing
What we focus on
- Production rate and variability
- Stabilisation status and existing process conditions
- Dewatering response and polymer sensitivity
- Current storage, handling and destination
Checks and control focus
- Sampling methods and chain of custody
- Odor, pathogen and storage constraints
- Mass balance and return-liquor assumptions
- Information needed for later route and outlet requirements
Typical outputs
Sludge and biosolids basis covering production, characteristics, handling constraints and material information gaps.
Preview
Brine / high-TDS residuals baseline
Define the source, composition, variability and handling conditions of high-TDS streams so concentration, materials, residuals and utility requirements can be developed on a reliable basis.
ScalingSolids routeHeat
What we focus on
- Source streams and upstream operating conditions
- Dissolved and suspended constituents affecting scaling or fouling
- Flow and composition variability
- Existing collection, storage and discharge route
Checks and control focus
- Solids handling and disposal constraints
- Heat, power, water and space availability
- Sampling and analytical gaps
- Information needed for later process and cost evaluation
Typical outputs
High-TDS stream basis with composition ranges, constraints, assumptions and targeted checks.
Preview
Odor / H₂S risk baseline
Establish where and under what conditions odor and H₂S are generated so later mitigation design is based on hydraulic, biological and operating causes.
HotspotsDriversMonitoring
What we focus on
- Generation points and affected areas
- Flow regimes, retention and septicity conditions
- Existing ventilation, dosing and capture arrangements
- Access, power, safety and O&M constraints
Checks and control focus
- Monitoring locations, methods and timing
- Operating events linked to odor or H₂S
- Upstream conditions that influence generation
- Assumptions and information gaps for later design
Typical outputs
Odor and H₂S basis covering generation conditions, hotspots, existing controls and monitoring needs.
PROJECT INFORMATION BASIS
A defined basis strengthens the work that follows
Formalised flows, loads, variability, constraints and assumptions give requirements, process design, equipment duties and later checks a common technical basis.
Information brought into the project basis
The review draws operating records, laboratory results, site knowledge, drawings and existing design information into one technical basis that can be used across the project team.
02
Existing layouts and practices
Current tankage, unit processes, networks, bypasses, connections, utilities and how the facility is operated in practice, including departures from original drawings or design assumptions.
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Constraints and operating conditions
Known compliance events, alarms, process instability, sludge handling limitations, maintenance access, space, power, outage and operating constraints that later design work must address.
Reconciling gaps and operating risks
The information is checked for consistency, coverage and relevance to the required work. The purpose is not a general operational audit; it is to identify the conditions and uncertainties that affect requirements, design and verification.
Performance
Compliance and process conditions
Parameters that approach or exceed limits, unstable processes, underperforming units, bypass conditions and assets operating outside their intended range.
Operations
Operating, maintenance and residuals conditions
Manual workarounds, operator burden, chemical and energy use, maintenance limitations, and how sludge, biosolids and other residuals are produced, handled and returned or removed.
Defining working ranges and the information plan
A project basis is not a single average. It records the expected, peak, upset and seasonal conditions relevant to the required duty, together with the assumptions and limitations that still need to be managed.
Targeted checks
An information plan tied to decisions
Sampling, monitoring and document review are limited to the information that can change requirements, sizing, equipment duties, integration or verification.
Design basis
Working ranges for design and review
Available data and defined scenarios are translated into flow, load, quality and operating ranges for process design, equipment definition, proposal evaluation and commissioning checks.
Common weaknesses in the project information basis
Information weaknesses may appear minor at the outset but later affect sizing, scope, procurement, commissioning or sustained performance.
Designing to averages
Expected, peak, upset and seasonal ranges are defined so equipment and controls address material variability.
Missing upstream drivers
Production cycles, cleaning/CIP, wet-weather flows, tanker inputs and other upstream events are linked to sampling and operating records.
Under-scoping residuals
Sludge, biosolids, brine, reject and return streams are included where they affect mass balance, handling, utilities or receiving routes.
Over-testing without a defined purpose
Additional checks are limited to information that can change a requirement, design decision or verification method.
Unclear receiving duty
Known reuse, discharge or outlet conditions are recorded so the next area can define the required quality, barriers and monitoring.
Information that cannot be checked later
Baseline parameters and later verification methods are aligned so commissioning and operating records can be compared with the project basis.
Streams we typically work with
The project basis may cover operating plants, new facilities and individual streams including:
STP - municipal / domestic sewage
ETP - industrial / trade effluent
GWTP - greywater
VWRP - vehicle wash water
LWRP - laundry wash water
Biosolids & sludge
Key outputs
Baseline summary, stream sources, current route, variability and data confidence
Information plan pack, targeted sampling and records, parameter set and review points
Working range, expected, peak, upset and seasonal cases for design and equipment definition
Constraints & connections, hydraulics, utilities, space, access, outage and O&M conditions
Issuing the basis for the work that follows
The reviewed information is formalised into a project basis that can be used across technical, commercial and delivery teams. It records the stream conditions, operating ranges, constraints, assumptions and information limitations relevant to the agreed work.
The next area uses this basis to define capacity and quality, reuse or discharge requirements and monitoring and economic requirements before process and equipment decisions are finalised.