Eesti veekasutuse dünaamika ja heitvetest pärinev reokoormus
http://et.wikipedia.org/wiki/Eutrofeerumine
http://www.tehnikamaailm.ee/kodujaehitus/index.php?id=109
http://www.google.com/imgres?um=1&hl=en&safe=off&client=firefox-a&sa=N&tbo=d&rls=org.mozilla:en-
US:official&biw=1024&bih=605&tbm=isch&tbnid=S7_w0TdVyS1EFM:&imgrefurl=http://www.soilcells.com/&docid=A1L
dosCiqCS3dM&imgurl=http://www.soilcells.com/images/DrinkingPollutedWater.jpg&w=500&h=414&ei=KpqmUOfJA4L
K0QXHnoCgAQ&zoom=1&iact=hc&vpx=12&vpy=188&dur=352&hovh=134&hovw=164&tx=139&ty=94&sig=10660271
5046843009998&page=1&tbnh=134&tbnw=164&start=0&ndsp=16&ved=1t:429,r:0,s:0,i:101
http://www.free-power-point-templates.com/water-conservation-powerpoint-template/
http://www.eestiloodus.ee/index.php?artikkel=1064
http://www.google.com/imgres?um=1&hl=en&safe=off&client=firefox-a&sa=N&tbo=d&rls=org.mozilla:en-
US:official&biw=1024&bih=605&tbm=isch&tbnid=l5RmNpBONkpWpM:&imgrefurl=http://www.elin.ttu.ee/~parveto/Archi
tec/Nomme/Thematic/Vesi/joogivesi.htm&docid=flhCQgAyd2VKTM&itg=1&imgurl=http://www