Irrigation and Drainage Components in a Paddy Plot with Fish Ladder

NAKAMURA Kimihito, FUKAMI Aya, HORINO Haruhiko, NAKAGIRI Takao, SAKATA Satoshi

doi:10.11408/jsidre.77.597

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小型魚道を付帯した水田の用排水諸元に関する考察
コガタギョドウオフタイシタスイデンノヨウハイスイショゲンニカンスルコウサツ

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Abstract

There is few research examples in which the comprehensive water management in the paddy plot with a fish ladder, which connects paddy ponding water and a drainage canal and has a function of run of fishes, is examined considering the water budget in a paddy plot. Hence, the fish habitat and the water budget components were investigated in the paddy plot with a fish ladder. We considered the effects of water management for the enhancement of the fish conservation function of paddy fields on the water budget in a paddy plot. As a result, the increase of the lot management water requirement by the increases of irrigation and runoff drainage induced the expansion of opportunity running from the drainage canal and entering from the irrigation canal and enhanced fish habitat in a paddy plot. The water management for the enhancement of fish habitat, by which the ponding depth is kept at the height of a flashboard set up at the outlet of a paddy plot, will require 1.3-fold irrigation water and yield 1.6-fold drainage water as much as the conventional water management, as an example. Furthermore, we discussed the necessity for a new concept of irrigation and drainage components under the paddy water management considering the fish habitat conservation.

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Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering

Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering 77 (6), 597-604, 2009

The Japanese Society of Irrigation, Drainage and Rural Engineering

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