The TreatmentChain test case demonstrates how to set up DataDrawers and DataFolders to represent multiple green infrastructure types of unit operating along a treatment chain, in parallel and in series. 

Basic: To operate a basic green infrastructure treatment, without devices in parallel or series, within the HydroPlusConfig.xml create a single DataDrawer. Within the DataDrawer, place two DataFolders, the first for the BulkArea, the second for the green infrastructure Type. The DataFolder for the green infrastructure should have one or both HydroPlusConfig.xml elements ImpAreaTreated_frac and PerAreaTreated_frac set to values greater than zero. 

Parallel Approach A: Create a single DataDrawer and place within it three DataFolders, the 1st DataFolder with the BulkArea, the 2nd DataFolder with a green infrastructure device, and the 3rd DataFolder with a green infrastructure device. The DataFolders for the green infrastructure should have one or both HydroPlusConfig.xml elements ImpAreaTreated_frac and PerAreaTreated_frac set to values greater than zero, and have Flag_Outflow_to_NextFolder = 0. 

Parallel Approach B: Create at least two DataDrawers and place within each at least two DataFolders, the 1st DataFolder with the BulkArea, the 2nd DataFolder with a green infrastructure device, and with any subsequent DataFolder assign it a green infrastructure device. The DataFolders for the green infrastructure should have one or both HydroPlusConfig.xml elements ImpAreaTreated_frac and PerAreaTreated_frac set to values greater than zero, and have Flag_Outflow_to_NextFolder = 0. 

Series Approach: Create at least one DataDrawer and place within each at least three DataFolders, the 1st DataFolder with the BulkArea, the 2nd DataFolder with a green infrastructure device, the 3rd DataFolder with a green infrastructure device. The DataFolders for the green infrastructure should have one or both HydroPlusConfig.xml elements ImpAreaTreated_frac and PerAreaTreated_frac set to values greater than zero. The 2nd DataFolder should have Flag_Outflow_to_NextFolder = 1, which will enable its surface and vault runoff outflow to enter into the green infrastructure device in the 3rd DataFolder. The series approach can allow for parallel treatment as well, and be extended to process longer series. 