Published: 2008/9/3
Theta disclosure requirements Tomitake Asakawa
September 2008 Director of Construction Kitazawa Youzirou 3 People like Jin Murai, Nagano Prefecture, Nagano governor Sun
Experimental verification of petitions seeking professional model depends on the dam and flood control measures for disclosure of data of water flow Asakawa
County, which has been Asakawa, including flood control measures and assisting in special flood-control dam, residents precious tax, so far, and can also be used from now on, and flood control measures based on proper scientific knowledge seeking the request on the following points.
- To disclose data such as flood control measures for gauging station Tomitake Asakawa.
- Model tests were conducted on the dam first, to verify that the position of different experts.
"1 For"
The county established an observatory in 2003 Tomitake level in the region since the middle Asakawa has been observed. This is Asakawa flood control measures, as necessary to be done on the basis of a more accurate measurement data, which is what a budget is being implemented.
So far, Asakawa Kitagou the upstream gauging station and the dam near the confluence is only affected by water from the back of the Chikuma River, water level observations were made did not come. So is not that Tomitake established a gauging station in the middle of the area.
Now that five years later, the data obtained in this Tomitake gauging station, and disclosed to citizens, by examining and, once again, questioned the validity of the measures should Asakawa County Flood Control has now been Why not. The following points specifically requested.
(1) Heisei began gauging station Tomitake observed in 15 out of the observation data to the present level of the year, each up to 5 years up to the second level, flow rate at that time (it should be asked by the calculation) and caused when it rain the day of飯綱observatory and weather station in Nagano Prefecture (From 24 until 0:00 pm, and 9 am until 9:00 am the next day) to be disclosed. Conjunction also disclosed that the water level gauging station flow data Kitagou at the time.
(2) to continue to observe the water level gauging station Tomitake. Originally, when we ask the degree of flood safety is said to be from the flow data as long as possible.
"2 For"
For perforated only flood control dam, even among scholars, experts and the impact on the environment, about the possibility of blockage of the hole is still divided.
Advocates and scholars of the ministry, perforated dam (dam water type) that proclaims the benefits of "貯Menai the sand" that is, the model experiments carried out in Nagano dam, obstruction of the hole affects the supply been denied by the deposition of sediment upstream of the dam is almost all there is.
Or, ignore the logic of the past, "the holes are not blocked by sand" and lead the conclusion that, for experiments conducted under conditions that do not pass through the earth dam with holes, these results How did you come to.
In addition, the experiment was 100 years for the river bed, this is a scholar of dams with a hole "type water after the dam was completed and that a certain amount of sediment deposited since replaced it with sediment during flood and, closer to a balance state of the inflow and outflow gradually "What logic is that the coordinated. If so, the state balanced its riverbed after 100 years, little remains that sand deposited in this experiment, further, is inexplicable.
Dam was completed holes is the only dam in the country Tagawa Masu, Asakawa dam in this model experiment, to clarify the questions to the dam with a hole like this, no matter what.
So gather experts with different opinions, we will visit a model experiment Asakawa dam at the same time, we are under the public exchange of views and to request validation.
More, disclosure and as soon as possible, thank you to demand answers.
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If you read to expand, then please click the link below to download a PDF file.
Asakawa PDF file disclosure requests Tomitake Theta (88KB)
■ Links
HP from the ministry, only flood control dam (so-called dumb holes) for
