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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, 2 Ifhfl <br />10 <br />InbI4 Intengrty {inches per hour <br />L_ <br />■ <br />g imp....■■■. :■■ �1■ ■ Him _ �� : : <br />--i ■■�■■:�son 0 �\■r— Ha immiiiii.�■■r■■ <br />■■i.■■u■uu--ii �.Z# MEMO ®iii■t_■■■Ii <br />7 i■■■■I111 r i! MININNZNImpin. ■■i■-____i■t_■■■I. <br />111 <br />■■■'1II111■M��■■1 ig '2 1011■ ■■■■ 1 <br />■■■p 11■■■■■ :# 1r l !M■ ■I■ <br />� <br />4 ■r111■■■•�l1 r r 1 ■1■ <br />1111.117011011011. 1■1 <br />flhIIh� !!Ii <br />2 1 iiIIUiiiiUI1IIItI1 <br />Emelinrion====2==1 ildowirmia Eib7% irk nali 4 r• <br />■M■■■!P■ii■ �w =MM."....i.1i-iMiil�•iiU#L. I1 <br />■■■■C �"iiI—r ,�Abiiiii=iil i....l OPI IM .■i.■ <br />�nir ■ y7 fl1. 119 7■==MM; MEM INN■I — ■■ L■rill <br />1 11611111 ■■■■1•■I =■■I■1I■■■OI■■■■MMll1 <br />20 7 �p 0 3D 1 * BO 41.8C <br />00 <br />Duration of Rainfaii or Time of Colicentrution {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 />