Button 21 & 22

BUTTON 21 performs several functions in the SIMS processing. First, the hydrology network defined in BUTTON 1 is resolved into topology levels of successive branchings, where, for example, topology level 1 streams are the most receiving streams (e.g., the collectors that do not branch or confluence into other streams), topology level 1 streams confluence into topology level 0 streams, and so forth.

After topology levels are determined, individual STRINGS of drainage system lines are assembled appropriate for analysis by hydraulics analysis programs such as the Los Angeles Water Surface and Pressure Gradient program or WSPG. Using the hydrology results stored in the SIMS data base, and the approved model network configuration developed in BUTTONS 5 to 15, including “telescoping” of system hydraulic elements according to rules selected by YOU (e.g., pipes do not down size more than 1 pipe size in the downstream direction, or other rules selected by YOU), data files are developed for processing by the WSPG or other available hydraulics programs.

Hydraulic controls are specified by YOU for the “level 0” topology lines (or the PROGRAM can use normal depth or soffit controls); otherwise, the myriad of other internal system junctions have HGL controls computed using junction structure analysis rules decided by YOU (e.g., use the upstream HGL of a junction structure as the control for laterals, or other rules).

BUTTON 22 executes the set of data files assembled via BUTTON 21. The selected hydraulics program is executed for each file automatically, reading the results, reading interim HGL data for subsequent file usage, and automatic execution of those files as well. All of the relevant HGL data are then read and stored in the SIMS data base. This tremendous set of operations is done automatically without any further user intervention to operate the program modules!

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