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Updated Surface Water Management Plan (SWMP) <br />City of Ramsey, Minnesota <br />3.5.4(2) <br />DRAINAGE MANUAL <br />August st 30,200 <br />0 <br />10 <br />Rainfall Intensity Linches per hour <br />L. — <br />9 ...A_...■7 1 ■ <br />■11 <br />■■ulem=■ ■ INIZN <br />s <br />5 <br />4 <br />3 <br />• <br />■ <br />121111.411401411146 <br />1 <br />1 <br />N111 --� <br />.i11E■■� <br />ii: iM■= <br />� w � <br />■ <br />■1 <br />■■ <br />ii koih 1 <br />1 <br />111111 <br />I�. <br />1_....�IM,71,1 <br />�.r.•-----_. <br />�EN=IMNIMMME <br />Ogrinamm <br />_milli iiii <br />�f EINEM <br />41 <br />1 <br />■ <br />1 <br />1i.mMrNIM '116Eimi <br />— 1®_■emu_ <br />20 3G 40 50 7a 80 9{l 10 100 <br />Duration of Rainfall or Tirne of Concentration {minutes} <br />Figure 3.4 Zone 1Setitkern Minnesota Rainfall Intensity - Duration - Frequency (WF) Curves <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 />