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<br />Shenandoah Improvements Feasibility Report <br />City of Lino Lakes, MN <br />WSB Project No. 018901-000 Page 5 <br />5.0 Modeling Methodology <br />One of the major components of stormwater design for this project is hydrologic and <br />hydraulic modeling. This consists of modeling to underst and how much water is <br />flowing through the site, what the peak rates and velocities of the flow reaches are, <br />and how high flood levels will be. InfoSWMM software was used for this modeling in <br />the project. RCWD has developed an InfoSWMM model for the project location and <br />upstream stormwater infrastructure. A part of this project was updating the model <br />based on City as -builts and stormwater system updates since its original creation. <br />There were two existing ponds added to the model . BAL -012 -A and an unnamed po nd <br />in Birchwood Acres Park. BAL -012 -A was assumed to flow west to Baldwin Lake but <br />based on City as -builts it actually outlets south to pond RLA -012 -A and ultimately <br />reaches Shenandoah Park and Rice Lake. The unnamed pond does not have as -built <br />documents, so storage was estimated based on Anoka County LiDAR data flown in <br />2011. Another update to model existing conditions was a change to the outlet of the <br />Shenandoah ditch under Birch St. The 36 inch RCP in the model was changed to <br />reflect the 24 inch RCP that is there currently. Other smaller changes included <br />updating basin storage based on as -built contours if available or 2011 LiDAR data <br />otherwise. An overview map of the model area in question is below.