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Qliver Suave in ~ En ineerin ,Inc. <br />.v g g g <br />Land Surveying • Civil Engineering • Land Planning <br />DRAINAGE SUMMARY <br />Elk River Lutheran Church <br />Elk River, MN <br />1/24/2012 <br />Revised 3/6/2012 <br />Runoff Rate and Volume Calculations <br />Runoff Rate (cfs) Runoff Volume (af) <br />Predevelopment Condition 0.5 0.045 <br />Current Condition 3.1 0.171 <br />Proposed Condition 1.6 0.090 <br />Impervious Surface Calculations <br />Current Impervious Surface Coverage: 69% <br />Proposed Impervious Surface Coverage: 43% <br />The reduction in impervious surface coverage is obtained by an increase in green space, <br />the use of pavers in the proposed sidewalk north and east of the building to create a <br />pervious surface, and the installation of an underground infiltration system north of the <br />building to infiltrate stonmwater runoff from the building addition and remodeled spaces. <br />The system is sized to store and infiltrate the 5-year storm event with no offsite runoff. <br />580 Dodge Avenue • Elk River, MN 55330. 763.441.2072 • fac. 763.441.5665 • www. Oliver-se. com <br />