Silke, one version is what Elvana suggested, if it is not specified as to what exactly is referring to when saying "shkarkues".

Now, it is very often in fact a dam or a dike, when we speak or retaining, collecting, or controlling the quantities or the flow of the water. Please see the link below and you will see different types of dams. In your case they are called dry dams or water discharging dams.