International Conference on Rain Water Cistern Systems
"Rainwater Catchment for Future Generations"
Keelung, Taiwan, R.O.C. - August 1991
5: Cistern Management and Operation Guidelines
Water Operation On Tameike
In Toban Region In Japan: A Rain Water Catchment System
Ishikawa agricultural college Japan
Kyoto university, Japan
Toban region has been irrigated mainly by tameikes which are operated mostly
intensively. The rules of operation have been formed by farmers experience for
hundreds of year. They are reasonable and instructive. So the author had investigated
about the tameike operation in the Toban irrigation area for several years and
got the following results.
1) Tameikes are classified into four types by their function, mother-ike, daughter-ike,
independent-ike and collecting-ike. They compose a water system combining the
function of each type of ike. Features of the system are much related to the topography.
For example, in the flat belt, a close combination between mother-ike and daughter-ike
Is obviously seen. In the mountainous belt, each independent-ike irrigates its
own area independently. And each collecting-ike exclusively supplies its daughter-ikes.
In the middle belt, the characteristics of both flat and mountainous belt are
2) A standard storage level is set at each tameike. Usually, it is decided
at a level of half to one-third of its full depth. When the storage of daughter-ike
decreases to this level before the middle of September, the mother-ike supplies
her during the night, from 20 to 6 o'clock in the next morning.
3) A ditch-tender selected among farmers exclusively operates the tameike and
distributes the water to each plot of field systematically. His standard working
time is usually 12 hours a day, from 6 to 18 o'clock. When it rains, he stops
release of tameike to conserve its storage.
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