Water quality prediction engine

Model the water quality of your river in the browser

Name: Hydrolitica
Author: Hydrolitica

Dissolved oxygen, BOD, nutrients and temperature reach by reach, with the QUAL2Kw methodology. No Excel, no macros.

Best on a computer: the model has 14 steps.

Illustration: typical dissolved-oxygen sag downstream of a discharge. Load the example project to see real engine results.

What it is used for

Simulate how a discharge changes dissolved oxygen and BOD downstream, and compare flow and load scenarios.

Compare the simulated profiles with the quality objectives of each reach as technical support for water resource planning.

Teach water quality modelling without installing software: students work in the browser, starting from the example project.

Prices in US dollars (USD). Start without an account; create a free account when you need more.

USD 0

2 simulations with the results on screen

USD 0

5 simulations a month, PDF (with watermark) and CSV downloads, AI analysis and cloud save

USD 19 / month

Or USD 149 / year. Unlimited simulations and PDF reports without the watermark. Renews automatically; cancel anytime.

USD 0

50 simulations a month with the institutional email of a registered university

Reproduces the outputs of the calibrated reference QUAL2Kw workbooks within 5%. Read the documentation
Based on the published QUAL2K and QUAL2Kw methods. Results are a technical modelling aid; you remain responsible for the calibration and the interpretation.
Independent tool, not affiliated with the U.S. EPA.