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Getting Started Each WEAP analysis is conducted in a single area. An area is typically a watershed, but could also be a larger or smaller geographic region. The last viewed area will open automatically when WEAP starts. These help files contain comprehensive information on using the WEAP software. To get started, we suggest you familiarize yourself with some of the major concepts: Help:  Use the Help menu to get access to WEAP's online documentation. Press the  F1  key to get context-sensitive help anywhere in WEAP. Views :  WEAP is structured as a set of five different "views" onto your Area: Schematic, Data, Results, Scenario Explorer, and Notes. These views are listed as graphical icons on the View Bar, located on the left of the screen. Current Accounts : The Current Accounts represent the basic definition of the water system as it currently exists, and forms the foundation of all scenarios analysis. Scenario analysis  is at the heart of using WEAP. Sce...

  The WEAP Approach Computer modeling in the field of water resources has a long history. Many sophisticated models have faltered by being mathematically obscure and overly ambitious in attempting to "optimize" solutions to real-life problems. Experience shows that the best approach is to build a straightforward and flexible tool to assist, but not substitute for, the user of the model. WEAP represents a new generation of water planning software that utilizes the powerful capability of today's personal computers to give water professionals everywhere access to appropriate tools. The design of WEAP is guided by a number of methodological considerations: an integrated and comprehensive planning framework; use of scenario analyses in understanding the effects of different development choices; Demand-management capability; Environmental assessment capability; and Ease-of-use. These are discussed in turn below. Integrated And Comprehensive Planning Framework WEAP places the ev...

  Demand Sites A demand site is best defined as a set of water users that share a physical distribution system, that are all within a defined region, or that share an important withdrawal supply point. You also must decide whether to lump demands together into aggregate demand sites (e.g., counties) or to separate key water uses into individual demand sites. The level of aggregation generally is determined by the level of detail of water use data available. Demand data may not be available for individual sites, but may only be available for a larger unit such as a city or county. In addition to data, your definition of demand sites may also depend on the level of detail desired for your analysis. When defining demand sites, it is useful to inventory the actual physical infrastructure, such as pumping stations, withdrawal facilities, wastewater treatment plants and well fields. You should think carefully about the configuration of the entire demand and supply system, including the l...

  Rivers, Diversions And River Nodes Both rivers and diversions in WEAP are made up of river nodes connected by river reaches. Other rivers may flow in (tributaries) or out (diversions) of a river. There are seven types of river nodes: R eservoir  nodes, which represent reservoir sites on a river. A river reservoir node can release water directly to demand sites or for use downstream, and can be used to simulate hydropower generation. R un-of-river hydropower  nodes, which define points on which run-of-river hydropower stations are located. Run-of-river stations generate hydropower based on varying streamflows but a fixed water head in the river. F low requirement  nodes, which defines the minimum instream flow required at a point on a river or diversion to meet water quality, fish & wildlife, navigation, recreation, downstream or other requirements. W ithdrawal  nodes, which represent points where any number of demand sites receive water directly from a riv...

  Supply And Resources Results Inflows To Area Water entering the system (river headflows, surface water inflows to reaches, groundwater recharge, local reservoir inflows, other local supply inflows, catchment precipitation). Outflows From Area Water leaving the system (consumption at demand sites, catchment evapotranspiration (ET Actual), evaporation on river reaches and reservoirs, losses in transmission and return flow links, groundwater and local reservoir overflow, losses in wastewater treatment, and outflows from the end of rivers and diversions that do not flow into other rivers or groundwater nodes). Note: Inflows to area may not equal total outflows from area due to changes in storage in reservoirs and groundwater . River Streamflow : The streamflow at selected nodes and reaches along a river. You can plot a line for each point on the river over time (choose Year for the X Axis, or a line for each month plotted along the river (choose River Nodes and Reaches for the X Axis...