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Updated Surface Water Management Plan (SWMP) <br />City of Ramsey, Minnesota <br />3.5.4(2) DRAINAGE MANUAL August 30,200f1 <br />10 <br />InbI4 Intengrty {inches per hour <br />L_ <br />MEimmlir ■■i■■iimmglism [��■rlia.rns-----=.■r.■ <br />■■ir■■i■ui >-- .-- __n-u®I—_■ al MI <br />7 MMEMENIBIMIIMIIIMIIIMMM N ZA pi7'#■MM■■_____■__...I■ <br />'■■■=■uffl-___•--* pi ■ millINIMI■1•■i_It <br />$ iwIIIiiii= MiimrtMI■l1 i <br />■■■'■III■■1■l�! '2U■ ■■■■■ 1 <br />4 u■■r1�11■!1 11>r3 ■■EM <br />■■■�1111 s <br />i■1.11111■■■■■■fln!i5S101 1■1I <br />1111111111 flhIIIh12.1 1 <br />i IiIIUiiiUI1IIIItI!1 <br />. ...����___. ■■___■.■■■■. Mh. Nk Irille ---- ■ <br />METIMMINIMIIMIMIE k, idelEIN <br />■m■■■!I■M� EM =.I. .i.iiiiii �i�iil_••i U#pump! <br />■■■■C liii�r iiMi!®•1®NIMPOP■1I� u. .. <br />minim ■ �. I , 11! i■==..I M■■■■■■1�—�ii■ �■�a1I <br />..*..® .lui ■■■' ■lliniii__ •u u■uiuiu■ia <br />#■■uIuuI• ■■■■■MA■' =MNIM1■■■OI■■■■■■I■l!l <br />7 1 0 20 3D Y * BO ' 8 I <br />0 ' 00 <br />Duration of 13.ainfail or Time of Concentration {minutes} <br />Figure 3.4 Zone 1 Southern eta Rainfall Intensity - Duration -Frequency (]DF) 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 />March 20, 2015 Page 76 <br />