itwh HYSTEM-EXTRAN 8.6

itwh HYSTEM-EXTRAN is a professional software package for modeling and analyzing urban drainage systems. Developed by itwh, it combines a rainfall–runoff module (HYSTEM) with a fully dynamic 1D hydraulic engine (EXTRAN) to simulate stormwater, wastewater, and combined sewer networks. The software captures key hydraulic behaviors such as surcharge, backwater, overflows, storage effects, pump and regulator operations, and real-time control strategies.

Engineers use HYSTEM-EXTRAN to assess network capacity, identify flooding hotspots, design and test rehabilitation measures, and evaluate network performance under various rainfall scenarios and future conditions. The platform supports efficient model building and review through GIS/CAD connectivity, structured data management, scenario comparisons, and clear visualization of results (including profiles, maps, and time series). Comprehensive reporting tools help document assumptions, results, and decisions for planning and compliance.

Widely applied by municipalities, utilities, and consulting firms, HYSTEM-EXTRAN provides a robust and transparent workflow for urban drainage planning, design, and risk assessment.

itwh HYSTEM-EXTRAN is developed by itwh. The most popular version of this product among our users is 6.7. The name of the program executable file is ITWH-KN.exe.