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Dam data table
　
 Dam No.：820
　
Koyadaira Dam ［Toyama Pref.］

Location (Latitude, Longitude) N 36°421' 36''，E 137°38' 53''   [Japanese Dam Finder]
Purpose／Dam type P／G
Height／Crest length／Dam volume 54.5m／119.7m／86 thousand m3
Catchment area／Water surface area 404.8km2／10ha
Reservoir capacity 2122 thousand m3
FY project started／completed 1933／1936


Notes:
1. Dam purposes are abbreviated as follows:
A: Agricultural irrigation   F: Flood control   I: Water supply for industry   N: Non-specified, river flow maintenance
P: Hydropower   R: Recreation   S: Snow melting &removing   W: Water supply

2. Dam types are abbreviated as follows:
A: Arch   B: Buttress   CSG: Trapezoidal CSG   E: Earthfill   FA: Asphalt face fill   FC: Asphalt core fill   G: Gravity
GF: Gravity concrete & fill dam (compound)   HG: Hollow gravity   MA: Multi-arch   R: Rockfill

3. The fiscal year (FY) in Japan is from April 1 to March 31 of the following year.

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