• Geohydrologisch Bemalingsadvies Dewatering Consultancy Services
    Research, calculation, modelling, monitoring and supervision of excavation dewatering projects
    We have the software and knowledge to offer you support and quality solutions.
  • Bemalingtools About us
    Loots groundwater international office is located in the Netherlands. Our knowledge is based on experiences in dewatering, experiences thanks to our roots: the dutch dense infrastructure, building structures and high groundwaterlevel.
  • R. Loots B.V. History R. Loots B.V.
    Loots Groundwater International is separated since 2012 from the main business for the dutch market (Loots Grondwatertechniek). With the new structure we are ready to explore and design solutions abroad.
  • schade Prevent damage
    With groundwater lowering close by objects or structures can be damaged. We can calculate the effect of groundwater lowering and based on calculation/experience determine the required measures to prevent soil settlements or structural damage
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Logo Loots Grondwatertechniek

Tuesday, December 22, 2015

New office

Pedro de Medinalaan 1
1086XK Amsterdam

Tuesday, October 30, 2012

project Barangaroo - modelling dewatering installation

Loots Groundwater International did groundwater modelling for dewatering installation for the Barangaroo project in Sydney, Australia. Requested by Pumpability PTY was to research if the dewatering installation design was sufficient. Different well placements are compared with 3D modelling in a wide range of permeability values. Results are based on transient calculations with MicroFEM software.

The results were presented in a dewatering report to present to the supervisors of the project. The size of the construction are was approximately 250 x 150m and total lowering of groundwater was about 10m.

The modelling was challenging because vacuum wellpoints were used at the pile walls, the practical drawdown limit was modelled. Another challenge was the steep (sandstone) bottom and leaks through fractures simulation.
Example drawdown after 60 days dewatering with a
given permeability

Monday, October 29, 2012

Welcome to our international website

We welcome you to our new international website. On the homepage you can find the latest news. In the menu you can find a short summary of services, history, reference projects, quality and experience can be found on this website.

For more information please contact us. For Dutch customers we recommend our national website www.lootsgwt.com

Best Regards,
Erik Loots

project: Three different dewatering building excavation methods compared

Figure 1 - lowering groundwaterlevel (effect three different methods)
Example project Netherlands
In figure 1 an example project can be found, this project was in the Netherlands. The client requested to calculate possibilities. Bottlenecks:
  • The current groundwater level was found, also the lowest and highest groundwater level in the last decade was determined based on archive research and calculation
  • Inside the -0.8m contourline ground settlements were expected
  • Other buildings around  project area are might be permanent damaged by ground settlements 
  • Difficulties discharged groundwater, no nearby capacity. Limiting discharge recommended
Three different building methods were modelled:
  1. FIGURE 1 LEFT - Long steel sheets around excavation to close aquifer and for stability
  2. FIGURE 1 MIDDLE - Short steel sheets plus mixed in place barrier + dewatering installation, with simulated seepage at corners
  3. FIGURE 1 RIGHT - No measures only dewatering installation for stability of slopes, concluded not recommended because to much groundwater lowering when dewatering period is 4 weeks. Also prognosis discharge was above capacity
Recommendations were made for the client his project preparation. Also a dewatering supervision was offered, Loots Groundwater International check if measures are good enough to tackle the bottlenecks. After start dewatering we offer troubleshooting, new measures, due new insights (for example calculate extra pumpcapacity because the soil seems to be higher permeablity as assumed when looking to discharge and groundwater lowering)

Friday, October 26, 2012

project: groundwater lowering predictions substantiated by 3D modelling & practical experience

Loots Groundwater International is challenged on a daily basis for construction dewatering projects. About 75% of the engineering done by Loots Groundwater International are dewatering projects. Most requests are special situations, for example calculate and design measures to limit total discharge or limit groundwater level lowering outside of project area.

Dewatering is often a small part of the total amount of costs for building excavation or for underground pipelines/infrastucture. Environment can be effected by dewatering for example: 
  • nature/agriculture that is harmed by groundwater lowering
  • buildings/infrastructure damaged by ground settlements (unavoidable consequence of the effective stress increases that result from groundwater lowering)
  • (groundwater) contamination displacement (for example contamination can move to drinkwater area)
  • archeology or wooden piles/underground objects are damaged by lowering groundwater level 
By investigation and 3D modelling measures can be calculated based on the data. A good prognosis of the effects is the result of calculation The exact effects are often never calculated, in each report concludes with expected ground behaviour by dewatering.