For optimizing water network pressure and flow, the best software depends on your project requirements and budget. EPANET is the widely recognized, free, open-source standard for general hydraulic modeling. For professional utility management, large-scale networks, and tasks involving complex GIS integration, commercial suites such as BentleyOpenFlows WaterGEMS or Autodesk InfoWater Pro are the industry standard.
1EPANETThe top choice for basic to intermediate hydraulic modeling when you need a free, industry-standard tool for smaller projects or budget-constrained environments.84%
2Bentley OpenFlows WaterBest for comprehensive hydraulic modeling that requires high interoperability, user-friendly operation, and robust planning and design capabilities for large municipal networks.77%
3Autodesk InfoWater ProIdeal for teams that heavily rely on ArcGIS, as this tool is built directly on the platform to support advanced geospatial analysis and automated hydraulic model calibration.54%
For a pressurized drinking-water distribution network, there isn't one universally “best” package—the right choice depends heavily on network size, GIS environment, calibration needs, transient analysis, and whether you're optimizing operations or simply simulating hydraulics.
For water-distribution network pressure and flow optimization, there isn't one universal winner—the right choice depends heavily on your GIS environment, network size, need for optimization, and whether you're building a live/digital-twin model.
Tight ArcGIS Pro integration, hydraulic scenarios, pressure/leakage analysis, criticality and transient analysis
EPANET
Cost-sensitive, transparent modeling
Free/open-source, robust hydraulic engine, excellent for core network hydraulics and custom workflows
Autodesk InfoWorks WS Pro
Large/complex utility modeling
Comprehensive water-distribution modeling and collaborative workflows
For your specific goal
If “optimize pressure and flow” means you want to go beyond simply calculating them—e.g. find optimal pipe upgrades, valve settings, pump schedules, pressure zones, or operating strategies—I'd put OpenFlows Water and InfoWater Pro at the top of the evaluation.
OpenFlows Water is particularly strong if you want optimization and operational analysis. Its current Advanced/Ultimate offerings include model calibration, pipe sizing/rehabilitation optimization, pump-scheduling optimization, SCADA integration, pressure-dependent demands, fire-flow analysis, and transient/water-hammer simulation.
InfoWater Pro makes especially good sense if your organization already uses ArcGIS Pro as the authoritative GIS environment. Autodesk describes a 1:1 relationship between InfoWater Pro models and ArcGIS Pro, along with pressure-zone, leakage, criticality, fire-flow, and transient analyses.
EPANET is an excellent starting point if you want a transparent, freely available hydraulic engine. It supports pressure-dependent demands, pumps, valves, tanks, multiple demand patterns, energy calculations, and steady/extended-period hydraulic analysis.
For an optimization project, I'd specifically test each candidate on:
Calibration: Can it fit measured pressures/flows automatically?
Pressure-dependent demand: Important when pressure varies substantially.
Pump optimization: Can it minimize energy cost while maintaining service pressures?
Valve/PRV optimization: Can it identify settings that control pressure without starving downstream demand?
Pipe rehabilitation: Can it optimize which pipes to replace/resize subject to a capital budget?
Extended-period simulation: Essential for daily operating behavior.
Transient analysis: Important if pumps, valves, or rapid operational changes create water-hammer concerns.
GIS/SCADA integration: Particularly important for an operational model rather than a one-off engineering study.
Scenario/optimization capabilities: You want to compare thousands of possible operating/design configurations, not just manually change one parameter at a time.
One important distinction: hydraulic simulation and optimization are not the same thing. A simulator tells you what happens for a given network configuration; an optimization workflow searches configurations to find solutions satisfying constraints such as minimum pressure, maximum velocity, tank levels, pump limits, and energy/capital cost.
If you tell me your approximate network size (number of pipes/nodes), whether you use ArcGIS, whether you have SCADA pressure/flow data, and whether your main objective is energy cost, pressure balancing, leakage reduction, or capital planning, I can narrow this to 1–2 appropriate platforms and lay out a concrete modeling/optimization workflow.
Choosing the "best" hydraulic modeling software for a water distribution network depends heavily on your budget, GIS integration, and whether you need standard pipe flow calculations or advanced real-time digital twins.
The industry standards and top options are categorized below by their primary strengths:
EPANET (Free / Open-Source)
Best for: Budget-constrained projects, academic research, and standard extended-period hydraulic and water quality simulations.
Why choose it: Developed by the U.S. EPA , it is the gold-standard calculation engine behind many commercial software packages. It is entirely free, highly reliable for steady-state and transient flow, and widely supported by the global water engineering community.
Best for: Comprehensive enterprise-level municipal modeling, automated design, and criticality analysis.
Why choose it: Features advanced optimization tools (for pump scheduling, valve placement, and fire flow analysis) and robust interoperability with GIS and CAD platforms. It runs directly on the EPANET engine but scales up data management for massive municipal networks.
Autodesk InfoWater Pro / InfoWorks WS Pro (Commercial Desktop / GIS-Integrated)
Best for: ArcGIS-centric workflows and advanced network lifecycle simulation.
Why choose it: InfoWater Pro operates natively inside ArcGIS Pro, making it ideal for utilities that maintain their asset data strictly in Esri environments. It handles complex operational scenarios, pressure-dependent demands, and automated model calibration seamlessly.
Qatium or OpenFlows WaterSight (Cloud / Lightweight / Real-time Digital Twins)
Best for: Operational decision support, day-to-day pressure/flow monitoring, and agile collaboration.
Why choose it: Qatium offers a lighter, collaborative, web-based digital environment built on top of EPANET logic. If your goal shifts from design to real-time operational troubleshooting (detecting leaks or managing pressure zones via SCADA integration), these modern cloud tools offer rapid deployment without heavy desktop bloat.
To help narrow down the ideal platform for your team, tell me:
What is the approximate size of your water network (number of nodes/pipes)?
Do you primarily use ArcGIS, CAD, or standalone databases for your spatial data?
Are you looking for a tool for design/planning or real-time operational optimization?
If you mean a pressurized drinking-water distribution network—pipes, pumps, tanks, valves, pressure zones, and demand nodes—there are several strong choices. The right one depends heavily on whether you need basic hydraulic simulation or full-scale optimization/operations.
Much less polished for enterprise GIS, optimization and operational workflows
OpenFlows WaterCAD
Conventional distribution-system design
Strong pressure/flow modeling and scenario analysis with a comparatively focused workflow
Fewer advanced optimization capabilities than the higher OpenFlows tiers
For your stated goal—optimizing pressure and flow—I would start by evaluating OpenFlows WaterGEMS and InfoWater Pro, with EPANET as the free baseline. Bentley describes its current OpenFlows Water platform as supporting steady-state and extended-period simulations, pressure-dependent demands, calibration, pipe/rehabilitation optimization, pump scheduling, SCADA integration, and transient analysis.
OpenFlows WaterGEMS makes sense if you're trying to do more than calculate pressures. For example:
calibrate the model against field pressure/flow measurements
optimize pump operation and energy consumption
identify pressure deficiencies and bottlenecks
evaluate pipe upsizing/replacement alternatives
model fire-flow conditions
run many operating scenarios
connect the hydraulic model to GIS and potentially SCADA
investigate water hammer/transients
The current OpenFlows Water product consolidates capabilities formerly associated with WaterCAD, WaterGEMS and HAMMER, with higher tiers adding optimization and SCADA capabilities.
InfoWater Pro is particularly worth considering if your organization already lives inside Esri ArcGIS. The important question isn't simply which solver is "better"; the surrounding data/model-management workflow can have a huge effect on productivity.
EPANET is an excellent benchmark. It's free/public-domain and can perform extended-period hydraulic and water-quality simulation, including pressure, pipe flows, tank levels, pumps, valves, controls and pressure-dependent demands.
If by "optimize" you mean automatically find the best combination of pipe sizes, valve settings, pump schedules, PRVs, tank levels, etc., don't evaluate software solely on its hydraulic solver.
For example, minimizing pumping energy while maintaining something like:
minimum pressure at critical nodes
maximum allowable pressure
required fire flow
tank operating ranges
pump operating constraints
velocity limits
pressure-zone requirements
That's where the difference between a basic hydraulic simulator and an optimization-oriented platform becomes substantial. OpenFlows Water explicitly includes calibration and optimization functionality in its higher tiers.
If you tell me (1) approximate number of pipes/nodes, (2) municipal/industrial/irrigation network, (3) whether you have GIS/SCADA data, and (4) whether your objective is pressure balancing, energy reduction, leakage reduction, or pipe/pump sizing, I can narrow this to the most appropriate 2–3 platforms and explain exactly how I'd structure the optimization.
The best hydraulic modeling software depends on your network scale and budget, with WaterGEMS by Bentley and InfoWater Pro by Hexagon serving as the top commercial platforms, and EPANET acting as the gold-standard free engine.
Top Hydraulic Modeling Software Options
Software
Best For
Key Advantage
Pricing Model
WaterGEMS
Comprehensive enterprise analysis
Advanced optimization, automated master-balancing, and Bentley HAMMER transient integration
Commercial (High)
InfoWater Pro
ArcGIS-centric municipalities
Native GIS integration and powerful scenario/asset management
Commercial (High)
EPANET
Academic, small utilities, custom tools
Free, open-source engine powering most commercial tools
Free / Open Source
InfoWorks WS Pro
Ultra-large regional networks
High performance for massive data sets and continuous simulation
Commercial (High)
Choosing Based on Your Needs
For Advanced Optimization & Analytics: Use WaterGEMS if you need built-in Darwin calibrator and scheduler tools for automatic pump operation and pressure-zone optimization.
For GIS-Driven Workflows: Use InfoWater Pro if your team works completely inside ArcGIS Pro and requires real-time spatial data synchronicity.
For Budget Constraints or Custom Apps: Use EPANET if you have programming resources to build custom optimization loops using its toolkit or lack budget for enterprise licenses.
To help narrow down the ideal platform, tell me:
What is the approximate size of your network (node/pipe count)?
Do you currently use ArcGIS or Standalone/MicroStation workflows?
Are you looking for automated optimization (genetic algorithms for pumps/valves) or manual scenario analysis?
The "best" software depends heavily on your budget, GIS integration, and the size of your utility. Virtually all major commercial packages for pressurized water distribution rely on the industry-standard algorithms originally pioneered by EPANET , but they add powerful data management, automated calibration, and GIS workflows.
The top options on the market sort cleanly into specific use cases:
WaterGEMS (Bentley Systems) - Best for comprehensive enterprise and GIS/CAD interoperability. It features robust scenario management, automated model calibration, criticality analysis, and fire-flow analysis. It runs standalone or integrates seamlessly into ArcGIS and MicroStation.
InfoWater Pro / InfoWorks WS Pro (Autodesk) - Best for ArcGIS Pro-centric workflows and high-fidelity digital twins. InfoWater Pro embeds directly inside ArcGIS Pro, while InfoWorks WS Pro handles massive, complex municipal networks with advanced cloud-compute offloading for heavy extended-period simulations.
EPANET (US EPA) - Best for budget-constrained projects, academic research, or simple networks. It is the free, public-domain, open-source backbone of the industry. While it lacks advanced automated tools and slick GIS mapping native to commercial software, its hydraulic engine is bulletproof and completely free.
WaterCAD (Bentley Systems) - Best for design-focused engineering. A subset of WaterGEMS, it is optimized for day-to-day pipe sizing, minor expansions, and operational troubleshooting without the full-scale enterprise asset management bloat.
To help narrow down the ideal choice, tell me:
What environment do you currently use (e.g., ArcGIS, standalone CAD, or completely open-source)?
How large is the network (number of pipes/junctions roughly)?
Do you need real-time operational/SCADA integration or strictly design and offline optimization?
The "best" hydraulic modeling software depends on your budget, network scale, and whether you prefer standalone tools or GIS-integrated platforms. Nearly all major commercial water distribution software packages rely on the gold-standard, public-domain EPANET hydraulic engine at their core, but they layer advanced data management, optimization, and GIS connectivity on top.
The top industry solutions are structured below by their primary strengths:
Bentley WaterGEMS
Best for: Comprehensive standalone analysis, automated design, and multi-scenario management.
Why choose it: It features robust built-in tools for critical optimization tasks like fire flow analysis, automated pipe sizing, energy cost optimization, and criticality analysis. It can run as a standalone application or integrate with ArcGIS and MicroStation. It also pairs cleanly with Bentley HAMMER if you need to evaluate severe pressure transients (water hammer).
Autodesk InfoWater Pro / InfoWorks WS Pro
Best for: Deep GIS workflows and enterprise digital twins.
Why choose it:InfoWater Pro operates directly inside ArcGIS Pro, making it ideal for municipal teams whose asset data lives natively in a geodatabase. InfoWorks WS Pro is favored for massive, highly complex networks (frequently preferred in large UK/international utilities) and offers powerful cloud-computing offload capabilities for heavy extended-period simulations.
EPANET (by the US EPA)
Best for: Budget-constrained projects, academic research, and smaller straightforward networks.
Why choose it: It is entirely free and open-source. For basic steady-state and extended-period simulations tracking pressure, flows, tank levels, and water age, EPANET handles the core math just as well as expensive commercial suites. However, it lacks advanced automated calibration, native GIS database syncing, and a modern interface.
Qatium
Best for: Lightweight, modern, and collaborative operational visualization.
Why choose it: A newer entrant in the digital twin and operational space, offering a free tier and an intuitive browser-based interface designed to make hydraulic modeling accessible to operators without requiring a steep engineering software learning curve.
Selection Quick-Guide
Choose WaterGEMS if you want powerful built-in optimization algorithms and flexibility between standalone or GIS use.
Choose InfoWater Pro if your engineering workflow is deeply embedded in ArcGIS Pro and you want a unified geodatabase environment.
Choose EPANET if you have zero budget or want to write custom scripts/extensions using an open-source engine.
To help narrow down the best fit, tell me:
What is the approximate size of your network (number of pipes/nodes)?
Do you already use GIS software (like ArcGIS) for asset management?
Are you looking strictly for offline planning/design or a real-time operational digital twin?
For a utility whose primary objective is "find the right pressures and flows, then determine what pumps, valves, pipes, tanks, and controls should change," I'd start with OpenFlows Water. It combines WaterCAD/WaterGEMS/HAMMER capabilities and is designed for analyzing and optimizing distribution networks, including scenarios involving pressure, demand, energy, fire flow, water loss, and operational conditions.
InfoWorks WS Pro is particularly compelling if you're building a sophisticated utility-wide model. It supports collaborative databases, scenario management, real-time/operational modeling, calibration against live data, emergency simulations, and digital-twin workflows.
InfoWater Pro makes more sense if your organization is deeply invested in ArcGIS Pro. It works directly inside ArcGIS Pro and supports pressure-zone analysis, pressure-dependent demand, fire-flow analysis, leakage modeling, telemetry connections, and what-if scenarios.
EPANET is the excellent no-cost baseline. It handles extended-period hydraulic simulation of pipes, pumps, valves, tanks and reservoirs and calculates pressures, flows, tank levels, energy use, etc. It is also useful as a foundation for custom optimization algorithms.
The hydraulic simulator itself isn't necessarily the optimizer. If you're trying to minimize something like:
energy cost + leakage + excessive pressure + capital cost,
while maintaining minimum service pressure and required flows,
you want a platform that can run many hydraulic scenarios and ideally connect to optimization, SCADA/telemetry, and GIS.
For that use case, I'd rank them:
OpenFlows Water — strongest general-purpose engineering choice.
InfoWorks WS Pro — strongest for large utility/operational/digital-twin workflows.
InfoWater Pro — strongest if ArcGIS is central to your organization.
EPANET — strongest free/open foundation and excellent for custom optimization.
If you tell me the approximate network size (miles of pipe / number of junctions), whether it's drinking water or another pressurized network, and whether you have SCADA + GIS data, I can narrow this down to the best choice and explain how I'd set up the pressure/flow optimization model.
Choosing the best hydraulic modeling and simulation software for a water distribution network depends heavily on your budget, organization size, and whether you need basic hydraulic calculations or advanced real-time digital twin integration.
The industry standards and top options break down into distinct categories:
EPANET (Free / Open-Source) : Developed by the US EPA, EPANET is the gold standard for public domain hydraulic and water quality modeling. Nearly every commercial software package on the market uses an engine built upon or compatible with EPANET. It is ideal for budget-constrained projects, academic research, and standard steady-state or extended-period simulations.
InfoWater Pro & InfoWorks WS Pro (Autodesk) : High-end, GIS-integrated (ArcGIS Pro) solutions built for enterprise-level potable water distribution networks. They excel at handling massive, complex models, automated network partitioning, energy management optimization, and upgrading into real-time operational digital twins via InfoWater/InfoWorks Live.
WaterGEMS / WaterCAD (Bentley Systems) : Extremely powerful commercial design and analysis software. WaterGEMS includes advanced built-in genetic algorithm optimization tools for automated master-sizing of pipes, fire flow analysis, automated model calibration, and critical asset management. It offers robust standalone interfaces as well as integration with ArcGIS and MicroStation.
Synergi Water (DNV) : A high-performance simulation software well-suited for very large municipal and regional water distribution systems. It is known for its fast calculation engine, robust scenario management, and advanced features for water quality tracking and transient analysis.
To help narrow down the ideal choice for your team, let me know:
Is your network small/rural or a large municipal/metropolitan system?
Do you require tight integration with a specific GIS platform like ArcGIS?
Are you looking for automated design optimization tools (like automated pipe sizing or pump scheduling)?
If your goal is specifically to optimize pressure and flow in a water distribution network, my top recommendation is Bentley OpenFlows Water (WaterGEMS) for a professional utility/engineering environment.
My shortlist
Software
Best for
Optimization
GIS integration
Transients
Cost
OpenFlows Water / WaterGEMS
⭐ Best overall
Excellent
Excellent
HAMMER included in higher tiers
$$$
Autodesk InfoWater Pro
⭐ Best if you're an ArcGIS shop
Excellent
Excellent
Yes
$$$
EPANET
Best free/flexible foundation
Limited natively
Basic
Limited
Free
InfoWorks WS Pro
Advanced utility modeling / automation
Excellent
Excellent
Advanced
$$$$
1. 🥇 OpenFlows Water / WaterGEMS — my overall pick
For a utility trying to find and implement better operating conditions, this is probably where I'd start. It supports steady-state and extended-period simulations, pressure/flow analysis, pump performance, fire flow, water quality, scenarios, GIS/CAD integration, SCADA integration, and optimization. The advanced tiers include automated calibration and optimization of pipe rehabilitation and pump scheduling.
The particularly useful distinction is that Bentley now packages WaterCAD, WaterGEMS, and HAMMER under OpenFlows Water. HAMMER is valuable if pressure optimization also involves surge/water-hammer analysis.
I'd choose this if: you're a water utility, consulting firm, or engineering group that wants a serious production model and expects to optimize pumps, PRVs, storage, pipe capacity, pressure zones, and operating strategies.
2. 🥈 Autodesk InfoWater Pro — best if you're heavily invested in ArcGIS
InfoWater Pro runs directly within ArcGIS Pro, which is a major advantage if your network, customer, elevation, valve, meter, and asset data already live in Esri GIS. It supports what-if scenarios, pressure-dependent demand, leakage modeling, fire-flow analysis, criticality analysis, telemetry connections, and pressure-zone analysis.
I'd choose this over WaterGEMS if: your organization is already deeply standardized on ArcGIS Pro and you want the hydraulic model to live very naturally inside that GIS environment.
3. 🆓 EPANET — best starting point and excellent reference model
Don't dismiss EPANET because it's free. It's widely used and can model the fundamental hydraulics of distribution systems, including pipes, pumps, valves, tanks, reservoirs, demands, pressure, flow, and extended-period behavior. EPA specifically lists applications such as pump/tank optimization, energy reduction, infrastructure sizing, and emergency analysis.
The downside is that optimization, GIS workflows, automated calibration, SCADA integration, and sophisticated operational workflows generally require additional tooling or custom development.
I'd choose it if: you're building your first model, doing research, want an open/free modeling engine, or intend to build your own optimization layer.
4. InfoWorks WS Pro — worth considering for sophisticated models
Autodesk's InfoWorks WS Pro is aimed more at engineering teams that don't need to work inside ArcGIS and offers advanced modeling and scripting/automation capabilities. Autodesk itself distinguishes it from InfoWater Pro on this basis.
What I'd use for your particular objective
If by "optimize" you mean something like:
Given our pipe network, demands, tanks, pumps, PRVs, and operational constraints, determine the best pump/valve settings and operating schedule while maintaining acceptable pressures and flows and minimizing energy/cost.
I'd rank them:
1. OpenFlows Water / WaterGEMS ⭐⭐⭐⭐⭐
2. InfoWater Pro ⭐⭐⭐⭐½
3. InfoWorks WS Pro ⭐⭐⭐⭐½
4. EPANET + an optimization framework ⭐⭐⭐⭐
The software is only half of the solution, though. The optimization methodology matters enormously. A good setup would combine:
Hydraulic model → calibrated against field pressure/flow data → optimization algorithm → candidate operating strategy → hydraulic validation → operational constraints.
For example, you could optimize pump schedules, PRV settings, tank levels, valve states, pressure zones, and possibly pipe rehabilitation against objectives such as minimum energy cost, minimum leakage, minimum pressure violations, and adequate fire flow. OpenFlows Water explicitly supports several of these optimization workflows.
If you tell me (1) approximate number of pipes/nodes, (2) whether you have SCADA data, (3) whether you're using ArcGIS, (4) whether pumps/PRVs are part of the optimization, and (5) whether you need real-time optimization or planning, I can recommend the best software and a concrete modeling/optimization architecture for your network.
