Abstract
The feature of agricutural water works is that a large volume of water is used when compared with other water works. Therefore, modern plans and designs try to utilize it to the utmost. However wate management after the project has been completed is entirely lacking and as a result the work put into this from the planning stage to completion is completely wasted. It is therefore necessary to develop a system of water management so that water is available for irrigation whenever required, irrespective of wet or dry year.
The author developed a method for water management for water source facilities by taking into consideration the features of the water source so that it will match the features of the irrigation areas. If the method proposed by the author is utilized both for new constractions and existing facilities, this can be accomplished simply by modifying and enforcing water management.
For this purpose, the water management of the river systems of Totsu and Kino are explained as examples.
In this river basin, four multi-purpose dams are built for convenience in input and output water calculation but it is necessary to formulate a rule because the problem of how much weight should be placed and the quantity of water released by each dam to the benefiting areas after completion of the project in the future will arise.
For this purpose, 20 dry years were extracted in the order of dryness for a period of 40 years from 1925 to 1961 in the present method and a method of releasing water to satisfy this was decided but the author proposed that a method devised from the standpoint of time series would be more advantageous. That is, the advantage of making it possible to decide resource collecting period of the base years of water discharge from dams or competition for other used (for example, power generation which does not affect irrigation as utilization of water during the non-irrigation period) from continuous water calculation of these periods are explained and as calculation for a large volume of water required for these is possible by using computers, it indicates a method for water management of the water resource facilities in the future.
