ITWH - Institut fürtechnisch-wissenschaftlicheHydrologie GmbH
About
ITWH GmbH (Institut für technisch-wissenschaftliche Hydrologie) is a German engineering and software firm headquartered in Hannover, with additional offices in Dresden, Flensburg, and Nuremberg. Founded over 30 years ago, the company combines hydraulic engineering expertise with software development to serve the urban drainage, wastewater management, and hydrology sectors across three business lines: consulting and planning, software products, and professional training. ITWH's flagship software is HYSTEM-EXTRAN (current version 8.8), the leading hydrodynamic sewer network simulation platform in Germany, with add-on modules for long-term simulation and distributed computing. FOG Pro (version 1.8) provides GIS-based sewer network modeling with 2D urban flash flood analysis, running on Autodesk and Bricsys platforms. KOSIM (version 7.8) performs continuous long-term drainage simulation for stormwater treatment verification and retention facility design, available in English for international use. GIPS and GIPS-Light (version 8.8) deliver graphical sewer system planning integrated with CAD platforms. The RW-Tools family (version 8.2) covers rainwater management planning per DWA-A 138 and DIN 1986-100 standards, including RW-Tools.xlsx, RW-Tools-A138, RW-Tools-DIN1986, and RW-Tools-ULTRA. itwh KOSTRA-DWD 2020 (version 4.2) provides access to the German Weather Service's heavy rainfall regionalization data. NVIS handles radar rainfall visualization, while NVIS-WebPortal delivers online access to DWD precipitation data and RADOLAN maps. PEN-LAWA 2010 evaluates rainfall measurements per LAWA standards. ITWH's consulting practice covers radar rainfall analysis, surface stormwater drainage, sewer hydraulic sizing, wastewater treatment optimization, water quality assessment under the EU Water Framework Directive, and flood protection. The company positions itself as the market leader for real-time control systems in smart city water management, serving municipal utilities, engineering consultancies, and public building authorities throughout Germany.
Key Products
Hydrodynamic calculation software for extensive sewer networks, providing hydraulic capacity verification, stormwater treatment analysis, and overflow simulation with add-on modules for long-term simulation and distributed computing.
A GIS-based information and planning system for building and maintaining digital sewer models, featuring 2D terrain modeling and urban flash flood analysis coupled with HYSTEM-EXTRAN.
A continuous long-term simulation model for stormwater treatment, management, and retention facility design, available in English for international use.
A graphical information and planning system running on Autodesk and Bricsys platforms for sewer network design, analysis, and asset management, available in full and light versions.
A suite of planning assistants for rainwater management, centered on DWA-A 138 worksheet for infiltration systems and DIN 1986-100 flood verification calculations.
An access tool for the German Weather Service's coordinated heavy rainfall regionalization data, essential for hydraulic dimensioning and design storm calculations.
Visualization and analysis software for georeferenced radar rainfall data overlaid with sewer and catchment information for precipitation monitoring and analysis.
A web-based portal providing access to all DWD rainfall station data as diagrams, MD/UVF formats, and RADOLAN radar-based rainfall maps without local software installation.
Precipitation data evaluation software for analyzing and processing rainfall measurements according to LAWA standards.
Expert engineering services covering radar rainfall data analysis, surface stormwater drainage, sewer network hydraulic sizing, wastewater treatment optimization, water quality assessment, flood protection, and integrated system approaches per all HOAI service phases.
Live online training courses focused on specific problem areas within urban hydrology, covering all ITWH software products and regulatory compliance topics.
Is this your company?
Claim this listing to update your information and feature your products.
Do you know where your next client is? We do.
Violations, consent orders, full historical DMR data, plant details and rankings for every regulated facility — searchable with a smart AI interface.
