2003 Volume 9 Pages 43-48
Inadequacy in hydrological data is always a problem in water resources development everywhere in the world, also in Japan. The project has been organized by the River Bureau, the Ministry of Land, Infrastructure and Transport with aim at making clear the real difficulties in hydrological observation and data-processing, and improving the data quality. This report is briefing the results of the project. Examples are assurance of discharge observation near and above the design flood level, in tidal rivers, in the backwater reaches of weirs and under other difficult conditions. Data checks are carried out at every hydrological data base by both computers and manual ways, for instance comparing the hydrograph at the certain site with those upstream and downstream. Careful investigation is applied to assure the stage-discharge relation. All problems found in the project are classified into two, local matters and common items. The local matters are now being solved locally, while the common items are under study in the research organizations. Thus quality in hydrological data will be much improved.
