Dam data table 　 Dam No.：550 　 Koyama Dam ［Ibaraki Pref.］ Dam Photo （Photo by: Dai） 020841 041661 Ike-chan 075935 Dai 041666 Ike-chan Location (Latitude, Longitude) N 36°471' 47''，E 140°38' 39''   [Japanese Dam Finder] Purpose／Dam type FNWI／G Height／Crest length／Dam volume 65m／462m／531 thousand m3 Catchment area／Water surface area 79.7km2／28ha Reservoir capacity 16600 thousand m3 FY project started／completed 1977／2005 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. Please send your comments Copyright 2012 JAPAN DAM FOUNDATION. All rights reserved.