| Case Name |
In the execution of the small and medium-sized rivers improvement business, since estimating the cost of the running knot blocks construction etc was failed, the cost of construction became expensive. |
| Pictograph |
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| Date |
1995 |
| Place |
Yamaguchi Prefecture |
| Location |
The prefectural office |
| Overview |
When the cost of draft prevention installation and the cost of running of knot blocks construction were estimated, the former was applied to the production rate of running water interception, water stop sheet, and the latter was applied to that of running knot blocks construction using water interception, water stop sheet, so the cost became expensive and the estimation became excessive. Therefore, it was recognized that government subsidy, a considerable amount of \ 2630,500 which is related to this, was unreasonable. |
| Incident |
The draft prevention installation was the construction which was installed the draft prevention materials to prevent the outflow of gravel in the slope of the headrace. The running knot blocks construction was the construction which was installed the knot blocks to protect the slope covered with the draft prevention materials. On the draft prevention installation and the running knot blocks construction, the costs were estimated by multiplying execution unit per 1m2 by execution area, according to the standard of estimation of the prefecture. The proper production rates were as follows:
The draft prevention installation; the production rate of draft prevention installation
The running knot blocks construction; the production rate of running knot blocks construction.
However, when the cost of draft prevention installation and the cost of running of knot blocks construction were estimated, the former was applied to the production rate of running water interception, water stop sheet and the latter was applied to that of running knot blocks construction using water interception, water stop sheet. The execution unit which cost much more was calculated. Therefore, the estimation became excessive. |
| Sequence |
* The running knot blocks construction of 7716m2 and the draft prevention installation of 5692m2 were carried out by government subsidy, considerable amount of \ 2630,500, in order to protect the slope of headrace to the drainage facilities as part of the small and medium-sized rivers improvement business.
* The costs of the draft prevention installation and the running knot blocks construction were estimated ecessively.
* Though considering \ 1268,920 such as the cost of connection reinforcing steel of the run knot block which was under estimated, the cost of this construction became the higher, and government subsidy, a considerable amount of \ 2630,500, was considered unreasonable. |
| Cause |
* The simple error of the estimating person, if being not arbitrary
* If being arbitrary, there is the possibility that many organizations are affected.
* It is also apprehended that there was no one who had knowledge of the construction. |
| Countermeasures |
* The penalty is established on the error.
* Estimation is not left to one person, many checks are carried out. |
| Knowledge Comment |
* When estimating, the errors of estimating the cost based on the different units are observed in many places.
* This case can happen as long as the human being conduct the culculation, but it is possible to reduce by the upper countermeasures.
* The estimation is not possible if knowledge of the construction is insufficient. |
| Scenario |
| Primary Scenario
|
Carelessness, Insufficient Precaution, Insufficient Analysis or Research, Insufficient Prior Research, Regular Operation, Nonobservance of Procedure, Possible Damage, Potential Hazard
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| Sources |
The 1995 fiscal year settlement inspection report ( Board of Audit ).
|
| Financial Cost |
Government subsidy delivery amount considered unreasonable \ 2630,500. |
| Field |
Civil Engineering
|
| Author |
YONEZAWA, Akio (The University of Tokyo)
KUNISHIMA, Masahiko (The University of Tokyo)
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