Rivers gone dead.
Ministry of the environment conducted radiation tests at 120 points of rivers in Fukushima prefecture. The test was done from 4/29 to 6/20/2012.
The highest reading was 165,000 Bq/Kg from the river bottom soil of Ukedogawa river in Namie machi, where is in Hazard area.
According to Ordinance of the Ministry of Economy, Trade and Industry No.112 [Link], radioactive material to contain more than 100 Bq/kg of Cs-134/137 must be properly stocked to not to cause public radiation hazard.
This is 1,650 times higher than the safety limit.
They also measured 2 Bq/L of cesium from Abukuma river, but this is lower than 2.7 Bq/Kg from well water in Chiba. It needs to be verified if Fukushima river is actually cleaner than well water in Tokyo area.(cf. 2.7 Bq/kg of cesium measured from well water at 25km from the center of Tokyo)