Uploaded on 2015-10-17 by okret

![Zürich city][1] ![out of Zurich][2] [1]: https://edxuploads.s3.amazonaws.com/1445077494820464.jpg [2]: https://edxuploads.s3.amazonaws.com/1445077788892708.jpg Surfaces in the city doesn't cumulate humidity. Wet ground/grass in rural areas needs a lot of time to evaporate before it eaven start to get warm, while the closed/even surfaces in the city heat directly. Flat surfaces heat fast and reflect heat-wave, there is no cumulating-layer, which can balance temperatures- which is common in nature becouse of its deep/multilayered surfaces. Dence and closed faceades prevent wind from air-exchange - while in the nature the schapes and surfaces never completely block the air-movements. Dark colors/materials lige glas and metall also add to heating process-they warm up very fast and emit heat through the wholae day. 3.Possible measures: - trees along the streets, narrow streets with 'green stripes' instead of wide one without greenery - as much ground/grass 'islands' as possible - green roofs - cobbled pavement instead of asphalt/conrete ones - white colors of buildings, good chosen materials - not too much metal and glass - structure which allow wind to get through 4.Policy taken Zurich is a 'green city' and it takes policy to avoid UHI: - green roofs are quite offen compulsory - green areas by planing living/offices estate have to be ensured - there is a lot procedures aiming to narrow the streets, put some more greenery - there is a minergie standard imposed on the buildings which reduces need of cooling (air conditioning)- becouse the shell of the building and shadowing systems are good enought - intitiative to reduce car-amount in the city (less heat from the cars): 2000 Watt Areals, narrow streets, expensive parking places Still there is a lot of closed/concrete surfaces and squares in new areas which doesn't allow water to get through.