RIVERS, THE MOST IMPORTANT NATURAL LIFE RESOURCES, ARE CONSIDERED AS THE CENTER OF DEVELOPMENT AND LIFE VESSELS OF EVERY COUNTRY. THEREFORE, SAVING AND LOGICAL USE OF THEM DOES NOT REQUIRE MUCH REASONING.CHANGING THE BIOPHYSICAL AND CHEMICAL FEATURES AND THE PERFORMANCE OF RIVERS IN THEIR VAST PATH FROM THEIR DEPARTURE TO THEIR DESTINATION POINTS HAS CREATED VARIOUS, UNIQUE AND COMPLEX HABITATS WHICH ARE EXPLAINABLE ONLY THROUGH DETERMINING THE CLIMATE PARAMETERS, TOPOGRAPHY AND ENVIRONMENTAL GEOLOGY AND A CONTEXT VASTER THAN THEIR BEDS. RIVERS, ASIDE FROM THEIR OWN NATURAL CHANGES, THESE DAYS, UNDER THE EFFECTIVE ACTIVITIES OF HUMAN TO REDUCE NATURAL DANGERS AND OVERUSE, ARE FACING DEEP DESTRUCTIVE CHANGES.SIAHROOD PASSES THROUGH GHAEMSHAHR CITY (IN MAZANDARAN PROVINCE) AND IS 68 KILOMETERS LONG. LONG AGO, SIAHROOD WAS ONE OF THE HABITATS OF TROUTS. TODAY, HUMAN FACTORS SUCH AS BIOLOGICAL DAMNS HAVE DISTRACTED THE NATURAL PROCESSES OF THIS ECOSYSTEM AND HAVE SERIOUSLY ENDANGERED THIS RIVER. IN THIS WAY, IT IS TRIED TO SEARCH ABOUT THE EFFECTS OF HUMAN FACTORS ON THIS ECOSYSTEM. GENERALLY, POLLUTION IN THIS RIVER IS DIVIDED INTO THREE PARTS OF INDUSTRIAL, AGRICULTURAL, URBAN AND (HOME). PRESENTLY, ONLY THE URBAN WASTEWATERS MOST OF WHICH INCLUDE DETERGENTS ARE RELEASED IN THIS RIVER. WE FOUND OUT, IN OUR ANALYSES AND SAMPLING OF THIS RIVER, THAT THERE ARE MANY SPECIES OF FISHES, CRUSTACEANS AND ANNELIDS THAT HAVE BEEN ABLE TO ADAPT THEMSELVES TO THIS ABNORMAL CONDITION. ACCORDING TO THE PAST OF THIS RIVER WHEN THE PEOPLE INHABITING ON THE SIDES OF IT USED TO DRINK THE WATER OF IT, AND THE RIVER HAD CLEAR AND PURE WATER, AND MANY DIFFERENT SPECIES OF ANIMALS LIVED IN THIS RIVER, IT IS HOPED THAT EFFORTS BE DONE TO IMPROVE AND QUALIFY THIS RIVER WITH THE LIVING CREATURES INSIDE IT, AND THOUGHTS BE PROVOKED FOR THE URBAN WASTEWATERS SO THAT THEY DO NOT GET INTO THE RIVER AND ENDANGER THE LIFE OF LIVING CREATURES IN THE RIVER. WITH EMPTYING THIS RIVER FROM THE POLLUTION, IT IS POSSIBLE TO RAISE DIFFERENT SPECIES OF FISHES, AND OTHER WATER-LIVING CREATURES. AND ALSO, IT IS POSSIBLE TO BUILD FISHING POOLS TO RAISE COLDWATER FISHES WHICH ARE OF HIGH VALUES AND CAN CREATE WORK OPPORTUNITY AND CAN PROVIDE THE PROTEIN CONTAINING FOODS OF THE INHABITANTS. ALSO, IT IS POSSIBLE TO MAKE GREEN SPACES AND PARKS ON THE SIDES OF THE RIVER FOR THE ENTERTAINMENT OF PEOPLE WHICH FOR SURE WILL BE GREAT WELCOME ON THE SIDE OF PEOPLE.