GIS For Biologists: Tip #16 – The ‘Shapefile Approach’ Vs The ‘Geodatabase Approach’ to GIS


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More St Venant Equations in #SWMM5

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This blog shows the relationship between the terms dq1, dq2, dq3 and dq4 in the SWMM5 code and the St. Venant Partial Differential Equations. dq2 = Time Step * Area wtd * (Head Downstream – Head Upstream) / Link Length or dq2 = Time Step * Area wtd * (HGL) / Link Length Qnew = (Qold – dq2 + dq3 + dq4) / ( 1 + dq1) when the force main is full dq3 and dq4 are zero and Qnew = (Qold – dq2) / ( 1 + dq1) The dq4 term in dynamic.c uses the area upstream (a1) and area downstream (a2), the midpoint velocity, the sigma factor (a function of the link Froude number), the link length and the time step or dq4 = Time Step * Velocity * Velocity * (a2 – a1) / Link Length * Sigma the dq3 term in dynamic.c uses the current midpoint area (a function of the midpoint depth), the sigma factor and the midpoint velocity dq3 = 2 * Velocity * ( Amid(current iteration) – Amid (last time step) * Sigma dq1 = Time Step * RoughFactor / Rwtd^1.333 * |Velocity| The weighted area (Awtd) is used in the dq2 term of the St...
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GUI Compilation Note for the #SWMM 5.1.x Delphi Code

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This is for Students who want to make their own customized version of the SWMM5 GUI Interface. You can use the  Embarcadero Starter Version for XE2 to XE7.  Here are the main files you download from the EPA There may be a problem with teechart and the starter version - see the note here  http://docwiki.embarcadero.com/RADStudio/XE7/en/FireMonkey_and_TeeChart   I got it work in XE7 but I did have to remove XPPRINTER references from the Delphi code.   CONTENTS OF SWMM5.1.007_GUI.ZIP ============================= Note from the EPA : This archive contains source code for the Windows graphical user interface portion of Version 5.1.007 of the Storm Water Management Model (SWMM). The interface was written using Embarcadero's Delphi XE2 (www.embarcadero.com). The name of the Delphi project containing the code is Epaswmm5. All of the files for the project can be found  in the GUI5_1_007.ZIP file within this archive. Before the Epaswmm5 project can be loaded into Del...
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