QUAL2K has been the gold standard for river water quality modeling for decades. We brought it to the web — combining proven deterministic formulas with a modern interface and AI-powered analysis.
More than a water-quality model: measure your complete environmental footprint. Water, carbon, and waste - with the same scientific rigour as QUAL2K.
Compute blue, green, and grey water footprint. Leverage your QUAL2K model for real grey-water computation.
Open module →Fuels, electricity, refrigerants. DEFRA + IDAE + IPCC factors. Ready for the Spanish MITECO seal.
Open module →Log waste by category and disposal method. Check EU 2030 recycling target (60%) and 2035 landfill cap (10%).
Open module →Estimate the grey-water footprint of a discharge in 30 seconds. No signup. Download the PDF instantly.
Try it now →The original deterministic river-modeling engine. Reach-by-reach water quality simulation.
Open engine →Free plan included. Pro monthly or annual. Unlimited access for registered universities.
See pricing →Unlike black-box AI models, every calculation in Hydrolitica is based on deterministic equations that environmental engineers have relied on for 30+ years. AI assists you — it never replaces the science.
Manning's equation, Streeter-Phelps, and the full QUAL2K kinetic framework. Every result is reproducible and explainable.
Use the built-in AI assistant to interpret results, suggest parameter values, and validate your setup — without replacing the deterministic engine.
Forget the Excel plugin. Define reaches, sources, and kinetics through a guided step-by-step interface. Export as JSON or CSV anytime.
Run the simulation and see dissolved oxygen, BOD, nitrogen, and phosphorus profiles instantly as interactive charts.
BOD decay, reaeration, nitrification, denitrification, phosphorus cycling, pathogen die-off, and sediment oxygen demand — all included.
The Python engine runs on Google Cloud. Results return in seconds, no local installation needed.
Set up reaches, headwater conditions, point sources, and diffuse sources.
Set kinetic rates, meteorological data, and observed data for calibration.
Hit "Run Simulation" and get dissolved oxygen, BOD, and nutrient profiles instantly.
Start building your water quality model in minutes. Free, open-source, and browser-based.
Open the Prediction Engine