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Updated Surface Water Management Plan (SWMP) <br />City of Ramsey, Minnesota <br />34 4(2) <br />Rainfall Intensity [inches per hour <br />1 <br />DRAINAGE MANUAL <br />F�'l3:*J�il:fl� rn �yI L r <br />■� I I_ 11 <br />1 <br />10 <br />20 <br />Angu*t 301, 2000 <br />Duration of Rainfall or Trrne df Concentration {run -lakes} <br />Fi uree 3.4 Zone 1 Sallthern Minnesota )Rainfall Intensity - Duration - Frequency F) Curvin <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 />October 21, 2015 Page 80 <br />