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CCP 09-10-2001
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CCP 09-10-2001
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<br />I <br />. <br />, <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />II <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />{' <br />I <br /> <br />9.7.01 <br /> <br />Section 3 - Hydraulic and Water Quality Analyses <br /> <br />Hydraulic Analyses <br /> <br />Regional Stormwater Treatment Locations <br /> <br />There are thirteen proposed potential regional ponds in Arden Hills that were <br />identified in a 1999 comprehensive drainage study by BRW Inc. (Dames and <br />Moore Group Company). TCAAP property was not considered or modeled as <br />part of this Plan. Two ponds within TCAAP, P-l and P-] 3, will be completed <br />as part of the reconstruction of TH 96, and will not be discussed in this Plan. <br /> <br />Figure 11 shows the approximate locations of the proposed regional ponds. <br />They are mostly located 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 construction of these facilities. Even though the <br />BRW, Inc. study and this Plan evaluate the proposed construction of regional <br />ponds, other stormwater treatment best management practices will be <br />addressed in the feasibility study stage. <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 drainage districts identified in the 1999 comprehensive <br />drainage study by BRW, Inc. and the proposed concept pond. The concept <br />pond was assumed to be rectangular in shape, with a ten-foot shelf below the <br />normal water level, side slopes of 3: 1 everywhere else, and a depth of six feet. <br /> <br />The 5, 10, and 100-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 100- 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-l2, has the potential for flooding the <br />low point on North Hamline Avenue and will need more detailed analysis <br />during the feasibility study/design stage to ensure no damage to the <br />surrounding structures 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 />City of Arden Hills, Minnesota <br />Local Stormwater Management Plan <br /> <br />A,ARDEN0101.00 <br />Page 24 <br />
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