HANN RWWater for Texas, 15Th Annual Conference, Water Resources Institute, Texas A and M University, P 135-150, November 1970 16 P, 8 Fig, 3 Tab2010-02-152010-02-151970 Novhttp://hdl.handle.net/1969.3/2321615TH-150THE AUTHOR CATEGORIZED WATER RESOURCES SYSTEMS MODELS AMEN ANALYSIS BY SYSTEMS ANALYSIS TECHNIQUES INTO 2 GROUPS, NAMELY SIMULATION MODELS AND LOAD EVALUATION MODELS. THE SIMULATION MODELS SIMULATED THE BEHAVIOR OF A GIVEN SYSTEM UNDER A GIVEN SET OF CONDITIONS OR LOADINGS. IN OTHER WORDS, THEY WERE A NUMERICAL SIMULATION OF THE BEHAVIOR OF THE NATURAL SYSTEM. SIMULATION MODELS WERE SUBDIVIDED INTO HYDROLOGIC MODELS, HYDRAULIC MODELS AND WATER QUALITY MODELS. LOAD EVALUATION MODELS ASSUMED SOME DESIGN CRITERIA FOR THE GIVEN SYSTEM AND WORKED BACKWARDS TO THE ALLOW WERE MORE LIMITED BECAUSE MANY SIMULATION MODELS COULD NOT BE EASILY REVERSED TO BECOME LOAD EVALUATION MODELS. THE BASIC IMPORTANCE OF LOAD EVALUATION MODELS WAS THAT THEY PERMITTED DIRECT EVALUATION OF THE ANSWER DESIRED. FOR THE PURPOSE OF ESTUARINE WATER QUALITY MANAGEMENT, THE APPLICATION OF ONE LOAD EVALUATION MODEL, NAMELY THE 'COMPLETELY MIXED MODEL' FOR THE HOUSTON SHIP CHANNEL, WAS DISCUSSED. ALSO ILLUSTRATED WAS ONE SIMULATION, NAMELY THE 'ESTPOL' (ESTUARINE PROBLEM ORIENTED LANGUAGE) SYSTEM FOR STEADY STATE WATER QUALITY PROFILE DETERMINATIONS. (VEVERKA-CORNELL)*SYSTEMS ANALYSIS*WATER RESOURCES SIMULATION ANALYSISCivil engineeringDesign criteriaECONOMICSEstuariesEvaluationHoustonHouston Ship ChannelHydraulic modelsHYDROLOGYLOAD DISTRIBUTIONSW 3070 Water quality controlSW 4010 Techniques of planningTexasWATERWater qualityWATER QUALITY CONTROLJournal