Uploaded on 2017-05-15 by Nina

Water. For example: the river the Maas runs through our city Rotterdam. There is a continous flow of water, which is related to numerous other stocks and flows. The rain we have in this area, is first collected in the drainage system of the city (stock) before it is added to the river and flows back to the see. We even have a huge underground water storage, since the drainage system is a bit overloaded (http://www.groenblauwenetwerken.com/measures/rainwater-storage-below-buildings-such-as-parking-garages/). This could be easily improved, if there would be less water which is added to the drainage system. It would help, for example, if there would be less street covered with bricks and asphalt. People. Everyday people come and go in and out of the city. In the Netherlands it is very common if people work in another city than where they live in, since cities are relatively small, as well as distances between cities. If it would be somehow possible to let more people work at home, or share a car, there would be less traffic jam and less air pollution by cars. Plastic waste. It is incredible how much plastics are produced to wrap daily goods in. Most of this plastic ends up in the waste bin (stock), and is transported out of the city (flow). The municipality is working on ways to recycle this material again (new flow), but for as I understood, there is still to much plastic leftover, so most of it is being burned. An example of making this flow smaller, is that the government of the Netherlands forbid to give free plastic bags with the groceries. Now, clients always have to pay at least 5ct for a bag. In this way, they are encouraged to use less plastic wrappings, so less are created (flows).