University of Twente Student Theses


The effects of LOP/Pinch culverts/weirs on complex water networks : a case study on a water system in the region Twente

Hehenkamp, M. (2019) The effects of LOP/Pinch culverts/weirs on complex water networks : a case study on a water system in the region Twente.

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Abstract:The study presented in this report investigates the effects of LOP/pinch culverts/weirs in water networks. The last decades the problem water and moisture deficit rise due to the climate change consequences in western Europe. With this change, the weather is foreshadowed to get more extreme in both extreme rainfall events and drought periods. The report introduces this context and gives a board insight into the changes which are foreshadowed for the policy area of the waterboard. To counteract these effects the waterboard Vechtstromen want to search for solutions that can be implemented within the water system. To determine the effects that the measures can have on the water system a background study is done which showed that LOP/pinch culverts/weirs offer a theoretical solution the problem of the moisture deficit and the extreme discharge peaks for the region. This is achieved with the storage and conservational effects these measures offer following study of (van Bakel, et al., 2013) and (Louw P. d., Vermeulen, Stuurman, & Reckman, 2001). To determine if the findings are reproducible in a different environment, thus in the policy area of the waterboard, a case study is done. The policy area was analysed and possible interactions with the environment and other factors that have an influence on the measures summarised. Based on this analysis a study area was chosen that faces moisture deficits and has a fast draining speed. These factors make the area suited to indicate if the chosen measures influence the water system. The method chosen to determine the effects of the measures is a modelling study. The model contains a 1-dimensional representation of the surface water network, thus the trench system, and is done in SOBEK 2.14. The study identifies changes in the discharge pattern of the study area. Additionally, the water height at different locations is measured and analysed to give further insight into the conservational effects of the measures implemented into the model. From the results follows that the measures have a positive effect on the discharge of the study area since the maximum discharges are decreased while the continuous discharge increases. This is beneficial against the more occurring flooding issues and the moisture deficit since water is kept longer in the system and discharge. This finding from the discharge pattern is further supported by the results found at the water height measuring locations. The model indicates that water is conserved in the trenches and therefore permanently stored in the systems since water heights increased during the experimentations. The study suggests that further research on the influence of LOP/pinch culverts is sensible since the measures show overall positive effects on the chosen indicators and hint that the implemented measures can be effective in dealing with the upcoming problems of extreme weather conditions in the future.
Item Type:Essay (Bachelor)
Faculty:ET: Engineering Technology
Subject:56 civil engineering
Programme:Civil Engineering BSc (56952)
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