project has been created other met stations may be added through the WinHSPF interface.) Leave the first option in this list selected for this tutorial.
In the Model Surface Segmentation radio buttons, the Grouped option creates a single model segment (one PERLND/IMPLND per land use) for all collective subbasins, and the Individual creates a single model segment for each subbasin. For example, assume the watershed delineation contains three subbasins, and each subbasin contains a land use called ‘Forest’. Using the Grouped option will result in one ‘Forest’ PERLND, say PERLND 101, contributing to each of the three delineated reaches. Using the Individual option, on the other hand, will result in three ‘Forest’ PERLNDs, say PERLND 101, PERLND 201, and PERLND 301, with each of these three PERLNDs contributing to one delineated reach. For this tutorial leave the selection set to Grouped.
Once the user has specified all of the information required in the Create Project window, click the OK button. Doing so will call the algorithms that build the new UCI file. The new UCI file is written to the BASINS project folder containing the .wsd file. Portions of the UCI file are created using the .rch, .psr, and .ptf files created when the New HSPF Project option was selected in the BASINS GIS interface.
Data sets are created in the project wdm file for the point sources included in the .psr file. The units of the data in these sets are lbs/hour for all constituents except flow, which is in cfs. For each point source data set, the scenario attribute is set to OBS-PT, and the location attribute is set to RCH plus the reach number. These attributes are used by the WinHSPF Point Sources tool to identify point source data sets.