In the past, ditches were essential in making various areas dry enough for agricultural and silvicultural activities. Recent changes in both rain patterns and land use however make this unlimited drainage often no longer desirable. In this study, we plan to do a preliminary study on the blocking of ditches with adjustable weirs. Our focus is both on applications in nature reserves and on agricultural fields. The area of study is a large forest located on a mixture of infiltration zones and temporary wetlands. Natuurpunt recently acquired these lands, and wishes to restore the local groundwater system. However, the many ditches currently draining the nature reserve make this impossible. In the long term, filling in ditches is considered as an option. But beforehand it is important to look what effects the blocking of these ditches will actually have, and whether this meets expectations. To do this, temporary weirs made out of sandbags will be constructed. Groundwater levels and outflow will be measured with the usage of piezometers and venturi measuring throughs. As mentioned though, we also want to make this applicable to agriculture. That’s why we plan to remove the sand-bags for short periods of time, akin to a farmer opening an adjustable weir before working on the field. Doing such studies in a nature reserve with a single owner seeking out cooperation makes it much easier to get permission.