Lyviken
-bedömning av dagvattenkvalitet
AbstractStormwater is defined as rain- and melted water. Ludvika kommun had little knowledgde about the stormwater that reaches a specific recipient Lyviken. Therefore they intended to do an research of the stormwater that leads down to Lyviken. The aim with this study was to assess the quality of the contents in the stormwater based on pH, conductivity, phosphorous, nitrogen, bacterias, oil and one sample that meassured the value of several methals. Since the population has increased for decades, the area of hard surfaces and asphalts areas also has increased. This can increase the pollutions that finally ends up in the recipient. Depending on what activity that is going on in the nearby area the pollutions that comes with the stormwater is a variety. The catchment area of Lyviken is approxiametely 2 000 000 m2 and the quality of the stormwater differs a lot, depending on where it comes from. The conclusion of this study is that there were not any chocking values of methals in the water and that the content of oil were pretty good except for three samples. Nitrogen and phosphorous exceeded the limits in most of the samples and in the majority of the samples the content of bacteria were way too much. The contents of bacteria should have been decreasing during the last years since an improvement in the water pipes has been taken place in a lot of places in Sweden, but that doesn?t seem to be the case in Ludvika. The reason why there is a lot of bacteria is probably because the pipes sometimes get filled to the brim with sewagewater. Keywords: stormwater, recipient, Lyviken, stormwater quality, pollutions.Nyckelord: dagvatten, recipient, Lyviken. Kvalitet på dagvatten, föroreningar.