The second grade river is further 6 water system 25 rivers, 58 rivers in total in application with necessary changes river the first-grade river 5 water system 24 rivers 1 water system 9 river in Yokohama-shi, and the total extension is about 210km. In addition, there is the River Act large number of waterway out of the application. River where river business section plans maintenance is 17 rivers this year. In addition, we are going to maintain retention facility as general river improvement measures in improvement of rainwater adjustment reservoir, school, park.
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Road and Highway Bureau river part river business section