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Site Sustainability Metrics <br />4-3City of Arden Hills Energy and Sustainability <br />Impervious Surface Cover: <br />As noted in Section 1, impervious land cover increases water <br />runoff and flash flood risks while also contributing to heat island <br />effects. The diagram to the Right shows the total impervious <br />surface area for the City of Arden Hill’s City Hall site.Based on a <br />2006 study done by Minnesota State University and the <br />University of Minnesota, titled “ <br />”, the relationship between impervious surface <br />percentage of a City and the corresponding degree of heat <br />island temperature increase can be understood as a ratio. Using <br />the relationships defined in that study, the potential urban heat <br />island effect of the existing site can be estimated.* <br />*Note: the calculations more accurately project the heat island impacts <br />of larger land areas such as neighborhoods or cities, however, by <br />applying them to the building site, we can understand the relative heat <br />island contribution of any given site in comparison to community wide <br />heat island potentials. City wide impervious cover based on MPCA “City <br />of Arden Hills Impervious Coverage Based on Satellite Remote Sensing” <br /> Impervious Heat Island <br /> Cover Impact <br />Twin City Metro Average: <br />City of Arden Hills Average: <br />Arden Hills City Hall Site:39% <br />24.7% <br />13.9% <br />6.7°F <br />4.2°F <br />2.4°F