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<br />I <br /> <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />lit <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />~ <br />I <br /> <br />8.15.01 <br /> <br />Section 3 - Hydraulic and Water Quality Analyses <br /> <br />Hydraulic Analyses <br /> <br />Regional Ponds <br /> <br />There are thirteen proposed regional ponds in Arden Hills that were identified <br />in a 1999 comprehensive drainage study by BRW lne, (Dames and Moore <br />Group Company). TCAAP property was not considered or modeled as part of <br />this Plan, Two ponds within TCAAP, P-l and P-13, will be completed as part <br />of the reconstruction of TH 96, and will not be discussed in this Plan. <br /> <br />Figure 10 shows the approximate loeations of the proposed regional ponds. <br />They are mostly loeated in natural low lands or inlets to lakes. It should be <br />noted that the City would need to further investigate the proposed regional <br />pond locations with respect to jurisdictional wetlands and regulatory <br />restrictions that may affect the construetion of these facilities. <br /> <br />Summary Discharge Data <br /> <br />HydroCAD@ modeling was completed for the eleven proposed regional ponds. <br />At this stage the ponds are only concepts, and therefore the modeling <br />consisted of the immediate drainage areas only and the proposed concept <br />pond. The modeling did not include any information from the upstream <br />drainage areas. The concept pond was assumed to be rectangular in shape, <br />with a ten-foot shelf below the normal water level, side slopes of 3: I <br />everywhere else, and a depth of six feet. <br /> <br />The 5, 10, and lOO-year, 24-hour, storms were run, using antecedent moisture <br />conditions II. The results of these models can be seen in Appendix D, <br /> <br />The lOO-year design storm was used to calculate a peak height of the pond <br />and to determine if any potential damage or flooding could occur at the <br />neighboring structures. Only one pond, P-12, has the potential for flooding <br />and will need more detailed analysis during design to ensure no damage to the <br />surrounding struetures will occur. <br /> <br />In addition to the HydroCAD modeling, stormwater quality and treatment <br />modeling was undertaken using the P8 Urban Catchment model. <br /> <br />A-ARDENOt Ot .00 <br />Page 22 <br /> <br />City of Arden Hills, Minnesota <br />Local Stormwater Management Plan <br />