▁its ▁construction , ▁the ▁B ust os ▁Dam ' s ▁height ▁was ▁increased ▁by ▁ 2 . 5 ▁meters ▁and ▁later ▁renamed ▁Ang at ▁After bay ▁Reg ulator ▁Dam , ▁increasing ▁the ▁service ▁area ▁of ▁the ▁Ang at - Ma as im ▁R ivers ▁Ir rig ation ▁System ▁( AM R IS ), ▁which ▁oper ates ▁the ▁A ARD ▁from ▁ 2 5 , 0 0 0 ▁hect ares ▁in ▁ 1 9 2 7 ▁to ▁ 3 1 , 4 8 5 ▁hect ares ▁in ▁ 2 0 ▁towns ▁in ▁Bul ac an ▁and ▁P amp anga ▁benef itting ▁ 2 0 , 5 6 2 ▁far mers . ▁ ▁The ▁series ▁of ▁ty ph o ons ▁from ▁ 1 9 6 8 ▁to ▁the ▁early ▁part ▁of ▁ 1 9 8 0 ▁was ▁dam aging ▁to ▁the ▁dam ▁whose ▁Bay ▁ 1 ▁sector ▁gate ▁finally ▁gave ▁way ▁in ▁September ▁ 1 9 9 0 ▁after ▁ty ph oon ▁" I ri ang " ▁carried ▁away ▁the ▁structure ▁ 2 5 0 ▁meters ▁down stream ▁from ▁its ▁original ▁post . ▁The ▁ag ency ▁has ▁undert aken ▁temporary ▁re hab ▁works ▁in ▁the ▁dam ▁using ▁their ▁own ▁budget ▁and ▁through ▁fund ing ▁assistance ▁from ▁the ▁World ▁Bank . ▁ ▁The ▁present ▁dam ▁was ▁re h abil itated ▁by ▁Kur im oto , ▁L TD ., ▁Os aka , ▁Japan , ▁manufact uring ▁date , ▁as ▁of ▁May , ▁ 1 9 9 7 . ▁ ▁It ▁has ▁W ashed ▁Out , ▁In take