We offer services in hydraulic engineering, water management and coastal engineering with many years of project experience – worldwide!

As a partner of industry, private investors and administration we solve complex problems from basic evaluation to monitoring of environmental impact.

Our competence and experience is the basis for our work.


Königsberger Str. 5
30938 Burgwedel / OT Wettmar


Company Profile


We are committed to the code of best practice and environmental sustainability.​

Nature & Water Resource Management​ ↦

We develop concepts for the rewetting of moors and the retention of water in the area in order to sustainably counteract the effects of climate change. This includes the construction of smaller dams, automatically movable weirs and all the necessary monitoring of water levels and groundwater levels.

Coastal Engineering & Port Engineering​ ↦

We have accompanied the major port expansions (berths 8 and 9 in Cuxhaven, north berth in Stade-Bützfleth) and new constructions (Jade-Weser Port) of recent decades with hydronumerical modelling of tidal water levels, current velocities and sedimentological investigations and observations, and created the conditions for subsequent implementation with supplementary natural measurements.

Rivers & Lakes​ ↦

We calculate the mixing processes of cooling water and substances in (tidal) rivers and lakes for complex tasks with density and temperature influences and carry out all the necessary natural measurements. Typical applications are large power station constructions in tidal areas or the management of reservoirs for drinking water production.

Environmental Monitoring ↦

Disponemos de equipos de alta calidad, como células de presión, sistemas DGPS con su propio bais y dispositivos ADCP (incluido un ROV para medir corrientes de hasta 7 m/s) para registrar niveles de agua y velocidades de flujo. También disponemos de sondas para medir la conductividad y sondas multiparamétricas para medir el nitrato, el valor pH y el potencial redox.


Dr.-Ing. Andreas Matheja

Andreas Matheja

Horst Buchholz

MSc Karoline Lillie

Tobias Rothhardt

Marc Baxmann


In 2007 we changed into our new office in Wettmar near Hannover.

Equipment ↥

Software ↥

Contact & Approach

Feel free to contact us or stop by.

Contact form


Survey Equipment

2 x Trimble DGPS 5700 (one system with radio antenna), Trimble Ltd.
Trimble DGPS 5700 (with with radio antenna), Trimble Ltd.
Trimble DGPS R6 GPS/Glonass
Tachymetric Device Geodimeter 610 (Robotic), Trimble Ltd.


Computer Technology

7 Double-Prozessor PCs, each with 4 GB RAM
4 Quad Core PCs, each with 16 GB RAM for numerical simulations
18 Quad Core Cluster Nodes, each with 8 GB RAM for numerical simulations
File Server with 16 Terra Byte capacity
A0 colour printer, A3/A4 colour printer


Bearing Equipment

Boat for hydrographic surveys and measurements (L=3,5 m, zerlegbar, Tiefgang = 0,2 m, 18 PS Tomatsu, with trailer)
Boat for hydrographic surveys and measurements (L=6,5 m, Tiefgang = 0,8 m, 2 x 60 PS Mercury, with trailer) for estuaries
Ponton (2 x 4 m) for measurements

Multi- Frequence Single Beam Echo Sounder BBES 200/15, Dr. Fahrentholz Ltd.


Equipment for Flow Velocity Measurements

Current meter ZS 25GFA for shallow water, Höntzsch Inc.
Current meter M1 and M5, SEBA Hydrometrie Inc.

ADCP Stream Pro, RD Instruments Teledyne Inc.
ADCP Rio Grande Workhorse, RD Instruments Teledyne Inc.


Equipment of a typical gauging station maintained by our office

Turbidity probes, Titan model (CTM 131/CTD 60M), Sea & Sun Ltd*.

Pressure sensors for waves 10 Hz and 12 x Mini Diver, Eijkelkamp / Schlumberger Ltd.*

Pressure sensors Mini Diver, Eijkelkamp / Schlumberger Ltd.*

(*typically we have about 50 pieces in stock)


GIS System ArcVIEW
AutoCAD Civil 3D (drwaing , model preparation, projecting)
Janet (model preparation, grid generation)

Hydrological numerical models

  • MIKE 11 (unlimited) (river basin management, water levels, discharge. water quality and sediment transport in rivers and estuaries) with coupling of surface and ground water using Visual MODFLOW)
  • Visual MODFLOW (groundwater modelling)
  • Simulationssoftware HYDRO-AS_2D (currents, discharge, dambreak, floods) using Finite-Volume-Method – FVM)
  • Simulationssoftware MARINA-2D (hydrodynamics, morphodynamics in rivers, estuaries and coastal areas using Finite-Element-Method -FEM)
  • Delft3D – 2D/3D Modelle & Delft3D Flexible Mesh (hydrodynamics, morphodynamics in rivers, estuaries and coastal areas using Finite-Difference-Method – FDM)

Evaluation software

  • CGS AQUA Terra (coupling of AutoCAD & Mike 11)
  • WISKI, Kisters AG (hydrology and tidal statistics)
  • DiverOffice
  • Quinsy Version 8.0 (echo soundings)
  • Davit ( visulaisation and analysis of model results of Marina)
  • R-Studio (statistical analysis)