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sje Ecohydraulic Engineering GmbH is a spin-off from the Department of Hydraulic Engineering and Water Resources Managment at the Institute for Modelling Hydraulic and Environmental Systems (IWS) at the Universität Stuttgart. Since 2001 the firm has provided engineering services in the fields of river hydraulics, river ecology, hydraulic structures and hydropower and specializes in the application and development of advanced simulation technologies. A key product of sje has been the development of the simulation software CASiMiR, which is primarily used to investigate water management problems, with a strong focus on hydropower. sje has strong partnerships with leading academic institutions such as the Universität Stuttgart, EAWAG in Zürich (CH) the Universität für Bodenkunde Vienna (A), the Universite Lyon (F) and the Universidad Valencia (E), and specializes in turning cutting-edge research into engineering practice.


We believe in the future of hydropower. Alongside wind, photovoltaic, and biomass, hydropower has a key role to play in international renewable energy development. Recognizing that hydropower does have an impact on river ecology, it is important to find suitable mitigation measures and strategies for this crucial natural source of electricity. sje provides engineering services to assess and mitigate the negative impacts of hydropower. In addition to considering the hydraulic structures, we look at the local flow field conditions in concert with a river's unique morphological characteristics in considering optimal hydropower operations.

The software CASiMiR-Hydro aids in the analysis of energy production considering hydrological data and technical plant specifications when considering changes to hydropower operations.

River Hydraulics

The study of fluid flows has been rapidly expanded due to the development of numerical models for use in computational fluid dynamics (CFD). In the past few years, rapid developments in the CFD field have expanded the engineer's ability to model complex heterogeneous environments such as rivers to determine the current velocity, water depth, bed shear, and hydrodynamic forces. sje makes use of a spectrum of 1D, 2D, and 3D hydraulic models (HEC-RAS, SRH, OpenFOAM), for the study of both stationary (constant in time) and instationary (changing with time) aquatic environments.


The aquatic environment is strongly tied to the flow properties of the ecosystem, and its study is called "ecohydraulics". sje specializes in the ecohydraulic investigation of river ecosystems. We have developed numerical models for the study of aquatic environments which allow for the investigation of changes in ecological functionality both in quantity and quality of aquatic habitats. The modeling framework CASiMiR offers a unique set of tools to investigate the dynamic interrelationships between flow and biotia in rivers, in substrate, as well as in the connected bank and floodplane zones. Current applications include the dynamic simulation of both local and regional scales, expanding substantially beyond static flow regimes and minimum flow assessments.