OO2:PROTECT LIVES & PROPERTIES AGAINST MAJOR FLOODS-FLOOD MGMT.  PROGRAM-CONST./MAINT.OF FLOOD MITIGATION STRUCTURES &  DRAINAGE SYSTEMS-CONST.OF DRAINAGE SYSTEM ALONG LIBERTAD MAIN (FROM ROXAS BLVD. TO TAFT AVE. PASAY CITY,STA.0+161 TO STA.0+322),PHASE 4
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