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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 30,200 <br />10 <br />InbI4 Intengrty {inches per hour <br />B r11rI- <br />II-7 ... 1 — <br />-■.■w.MIM <br />MEMBEIMII <br />$ ■ Will' <br />• p1 <br />3 III <br />I HUH <br />MEIN ■l <br />-m\ ■1 •. <br />-:-..:71, . <br />_ __ ..._ � MiZIh 1Miir.liallM MN <br />11 <br />■INHhii11 <br />11111111 'Nil <br />iuuunuui•Ii.46 miiiiiiiiih t. <br />maim I: <br />mmommoimmoNNINENE <br />M��iokiii i iiEdiv� NI®®MPOPII��-- • U`Uiiii <br />.....�.Mil=bokiiimerarrrPl�.liu11!i.■uu■irniiii■uuiuiuuii <br />rHIMMM.t ■■■MENNAM■��■II��■1■M■■■�■I.111 <br />20 3G - Y Bn 9a •I 00 <br />Duration of Rainfaii or Tirrre of Concentration {minutes} <br />m■ ■ <br />MEIER <br />n <br />• <br />■ <br />• <br />MI ■ <br />Ill <br />Figure 3.4 Zone 1 Southern eta Rainfall Intensity - Duration - Frequency (]D ) Cun i <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 />-_® <br />111 <br />