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Updated Surface Water Management Plan (SWMP) <br />City of Ramsey, Minnesota <br />3.5.4(2) <br />1 <br />DRAINAGE M4NIJAL <br />10 <br />Duration of Rainfall or Trrne dfConcentration {rninukes) <br />Anguat 301, WOO <br />5Cd 60 70 60 90100 <br />Fi uree 3.4 Zone 1 Southern Minnesota Rainfall Intensity - Duration - Frequency F) Cun c <br />Impervious Surface: The portion of the buildable parcel which has a covering which <br />does not permit water to percolate into the natural soil. Impervious surface shall include, <br />but not be limited to, buildings, all driveways and parking areas (whether paved or not), <br />sidewalks, patios, swimming pools, tennis and basketball courts, covered decks, porches, <br />and other structures. Open, uncovered decks are not considered impervious for the <br />purposes of this ordinance. The use of patio blocks, paver bricks or class 5 gravel <br />material are considered impervious surfaces as a majority of water runs -off the surface <br />rather than being absorbed into natural soils underneath. Some exceptions to these <br />conditions may include paver blocks or pavement systems engineered to be permeable <br />with the underlying soils suitable for infiltration. <br />Infiltration Basin: An impoundment where incoming storm water runoff is stored until <br />it gradually infiltrates into and through the soil of the basin floor. <br />Section XI <br />March 20, 2015 Page 76 <br />