The modeling system provides capabilities for adjusting observed river flows to represent natural conditions, simulating regulated flows representing specified conditions of development, and performing statistical frequency and reliability analyses. Allocation of limited water resources between agricultural, municipal and environmental uses now requires the full integration of supply, demand. Freshwater management challenges are increasingly common. The traditional Crank-Nicolson method is. WEAP ('Water Evaluation And Planning' system) is a user-friendly software tool that takes an integrated approach to water resources planning.

Both models are formulated as one-dimensional equations. The second model is an advection-diffusion-reaction model that provides the pollutant concentration field. The first model is the hydrodynamic model that provides the velocity field and the water elevation. The effects of population and economic growth, water resources development and management, and climatic variability on river flows vary with different conditions found across the state. Two mathematical models are used to simulate water quality in a non-uniform flow stream. Stream flow is extremely variable, subject to severe multiple-year droughts, intense floods, seasonality, and continuous fluctuation. Diverse climate, hydrology, economic development, and water management practices across the state combined with continual population growth and implementation of a statewide water availability modeling system makes Texas an excellent case study of stream flow characteristics and modeling and analysis methods that are relevant worldwide. River flow characteristics and computational methods for converting sequences of monthly flows between natural and regulated conditions are explored based on experience in assessing water availability throughout the state of Texas in the United States.

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