In October 2022, EV-INBO and TIIAME tagged 29 snowtrouts in Shakhimardan to track their movements and habitat use at the demo site before the construction of the hydropower installation. Although the manufacturer estimated that the tags would last one year, which was enough for our study, about ten are still active!

This provides an excellent opportunity as it provides us extra data, particularly in spring, as that proved to be the period that snowtrouts migrated over 10 km downstream for reasons we are still analysing. Therefore, scientists from TIIAME are still going to Shakhimardan regularly to track the snowtrouts. In addition, another 30 radio transmitters have been ordered and will be surgically implanted in the snowtrouts the coming spring to continue the tracking experiment. The goal of this following tagging experiment is to study if the hydropower installation and activation has an impact on the snowtrouts returning to the River Koksu after their downstream adventures.

We are currently analysing the tracking data that has been collected so far and in general, we observed that the snowtrouts move downstream in spring and early summer, but migrate back upstream in late summer and autumn.

Author and picture credits: Pieterjan Verhelst, EV-INBO

Since the beginning of the Hydro4U project, the partners have been working together on the planning and installation of two small hydropower plants in Central Asia.

For the demonstration hydropower plant in At-Bashy, Kyrgyzstan, in addition to the turbine components supplied by project partner Global Hydro Energy, Austria, many hydraulic steelwork components (stop logs, penstocks and trash racks, as well as a trash rack cleaner) were also planned. This is where the company Erhard Muhr GmbH, Germany, comes into play. They are experienced in manufacturing of hydropower equipment. As part of Hydro4U their core activities are the economic and ecological optimisation of the Hydroshaft Power Plant equipment, the manufacturing, supply and installation of trash racks with integrated cleaning device, flow regulation gates, stop logs, as well as the validation.

They calculated and constructed these in detail for the demo-site in At-Bashy using up to date CAD and FEM tools. From autumn 2023 until the end of 2023, this first phase was completed and Muhr focused on the production of these parts ever since including production planning and purchasing. Since 2024, they have been directly involved in the production of the components.

Components, such as the stainless steel guides for the top water dam panel, the regulating gate and the underwater dam panel and their lifting beams, and the supports for the shaft rakes are embedded in the concrete during construction work are ready for delivery to the demo-site. Due to the climatic conditions, the guide for the penstock is equipped with piping for a heating system. This system will keep the gate operational even in the harsh winter conditions in Kyrgyzstan.

The stop logs are made of lightweight aluminum in order to keep the crane capacities required for assembly and disassembly as low as possible. It is possible that the dam panels will already enable or support the damming and drainage of the construction site for the installation of the remaining equipment.

Author: Fabian Böttger, Project Management, Muhr

Picture credits: Muhr

The Hydro4U demonstration hydropower plant in At-Bashy has reached the detailed design phase. The use of dedicated structural analysis software has facilitated the adoption of an integrated BIM solution for the detailed design of the At-Bashy hydropower plant in Kyrgyzstan.

ILF Consulting Engineers Austria, which has been responsible for the detailed design of the At-Bashy demonstration hydropower plant, prepared formwork and reinforcement drawings for the construction of the modular Hydroshaft Power Solution (HSPS). During this process, optimizations and structural adjustments were made to the design; all using Building Information Modelling (BIM) – exemplifying how dedicated structural analysis software enables an integrated BIM solution.

The workflow used can be described as follows: The basic design was prepared by the Technical University of Munich (TUM) and provided to ILF for further development and review. After an initial review of the basic design elements, which include subdivision of the hydropower plant with construction joints, a three-dimensional (3D) structural Finite Element Model (FEM) was created. Dead load, earth pressure and external influences such as wind and snow were defined and applied to this model. As these loads induce stresses in the structure, these loads were calculated using the FEM.

As a result of these load calculations, the required reinforcement according to the applied load was then visible in the model. An example of the required stirrup reinforcement is shown below. The required reinforcement is defined and set for each element in the model.

The FEM is part of the larger BIM model, allowing plausibility checks regarding the location, quantity and spacing of the reinforcement to be conducted easily, and thus helping to ensure the practicality of its installation on site.

BIM models can be visualized using different views. In addition to full 3D views, sections and viewing angles can be displayed. Dimensions and further information can be added to the views. As only one model is used, these individual views can be used for formwork and reinforcement drawings. The reinforcement material list generated by the software could also be added to the drawings.

The BIM approach makes it possible for everyone involved in a project to have a good overview of the project at all times by using a cloud-based setup. The model is stored on a platform so that multiple users and experts from different disciplines can follow the progress of the project and intervene, if necessary.

In this project, the 3D model was stored in a cloud to give all relevant project members insight into the progress of the design work. The 3D model was used as the basis for discussing all coordination issues, which were resolved before the 2D drawings were started. The reinforcement was also part of the 3D model and allowed a high level of accuracy to ensure practicality on site.

The ILF Group is an international engineering and consulting firm that supports its clients to successfully identify, prepare and execute technically challenging energy, industrial and infrastructure projects all over the world in the following main business areas: Energy & Climate Protection, Water & Environment, Transportation & Urban Spaces and Resources & Sustainable Industry.

Picture credits and authors: Ulrich Beikircher, Rupert Feldbacher, Gabriel Pojer, ILF Austria