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Summary of jotsuura dam

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Summary of jotsuura dam





 jotsuura dam is multipurpose dam supplying of maintenance (securing of agriculture water, maintenance of river environment), water supply water of normal function of flood control, running water.
 We started the dam body construction from 1999 and were completed in 2004.
20% of figures of basin


(1) Flood control
  In plan rise of a river flow rate 26 (㎥/s) of dam point, we perform 20 (㎥/s) flood control and perform reduction, prevention of flood damage of Ariakemachikoutsuura, Amakusa-shi district.
(2) Maintenance of normal function of running water
  We stably supply water from dam to the downstream river to maintain supply and river environment of agriculture water of dam jitenshitaryuenkawa.
(3) Water supply water
  As water supply water of Ariakemachikoutsuura, Amakusa-shi district and adjacent district, we supply up to 800 (㎥/ day).

Specifications of dam

(1) Specifications
Specifications of damWater system nameUpper Tsu UrakawaReservoir specificationsCatchment area (㎢)1.17 (directly: 0.56 indirectly: 0.61)
River nameUpper Tsu UrakawaFlooding area (㎢)0.025
PositionAriakecho, Amakusa-shiTotal storing water capacity (㎥)467,000
ModelGravity-type concrete damValid storing water capacity (㎥)440,000
The amount of bank (m)54.0Flood control capacity (㎥)230,000
Mayor of bank top (m)205.0Irrigation capacity (㎥)210,000
(maintenance 160,000 of normal function of running water)
(water supply 50,000)
Bank volume (㎥)141,000taisayoryo (㎥)27,000




(2) Storing water capacity distribution figure

25% of figures of capacity distribution (construction magazine)


Structure of dam

(1) Ground plan
30% of ground plans

(2) Front elevation (the upper classes side)
27% of front elevation (the upper classes side)

(3) Cross section
30% of cross sections


■Amakusa airline in the case of the use

 It is about 40 minutes by rent-a-car and taxi from Amakusa Airport


■Car in the case of the use

 It is about 1 hour 40 minutes from the Kumamoto city   

 From Matsubase I.C        About one hour ten minutes

 It is about 30 minutes from Amakusa-shi government office



We relate to this page

Amakusa Area Administrative Headquarters Department of Civil Engineering engineering works Lesson 2
3530, Imagamashinmachi, Amakusa-shi
Telephone: 0969-22-4648
Fax: 0969-23-0305
Email [email protected]
(ID: 26624)
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Kumamoto prefectural government office   〒 862-8570  6-18-1, Suizenji, Chuo-ku, Kumamoto-shi, Kumamoto Tel: 096-383-1111 (main)
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