TheErtanHydroelectricProjectislocatedabout40kmnorthfromDukouCityinSichuanProvince,onthelowerreachofYalongRiver,whichisoneofthetributariesofYangtzeRiver.Thedamsitecontrolsadrainageareaof116,400km~2,theannualaver-agerunoffandannualaverageriverdischargeatdamsiteamountto52.9×10~9m~3and1680m~3/secrespectively.Thenormalpoollevelisof1200m,thetotalreservoirstorageandeffectivereservoirstorage