ENVIRONMENT PLAYS AN IMPORTANT ROLE IN MAN LIFE AND OTHER LIVINGS. GROUND WATERS, RIVERS AND WATERS ON DAMS ARE IMPORTANT AND NEEDED TO IMPROVE LIFE AND BIOLOGIC REQUIREMENTS (MASSONG, 2005). WE NEED KNOW THEIR MECHANISMS DIRECTING TO OPTIMIZE PHYSICS AND HYDRAULICS DOMINANT. THE KARUN RIVER AS THE BIGGEST ONE IN OUR COUNTRY, IRAN, PASSES FROM DIFFERENT CITIES SUCH AS SHUSHTAR, AHWAZ AND DEZFUL; AND SO AFFECTS ON PEOPLE S LIFE THERE. PEOPLE IN THESE CITIES HAVE INTERACTION WITH IT DIRECTLY ABOUT DRINKING, IRRIGATION AND BOAT TRANSPORTATION. THIS RIVER ARRIVING SHUSHTAR FROM TAKHTE GHEISAR AND IS DIVIDED IN BAND MIZZAN TO TWO BRANCHES, GAR GAR AND SHOTTEIT. GAR GAR IS A DIRECT FOR WATER THROUGH ANCIENT FAN TENS SERIES FOR ENTERTAINMENT. AS A RESULT OF COASTAL ROCKY WALLS ON IT, WATER PENETRATION HAS A SMALL VALUE THERE. IN THIS RESEARCH, COMPARING CURRENT DEBIES IN DIFFERENT YEARS FOR THE GAR GAR BRANCH, WE MENTION HYDRAULIC BENEFITS OF DIRECT RIVER CANAL, SHUSHTAR DOMAIN. IN THIS PAPER WHICH IS RESULT OF ONE YEAR RESEARCH, WE GIVE A MANAGEMENT METHOD OF ENVIRONMENT AROUND RIVERS AND TO PREVENT WATER POLLUTION.