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�' ' ' , • . <br /> � , .3 �F!>�GDy,� E-20 � <br /> � • <br /> � <br /> ' MOUND DESIGN PROCEDURE (Continued) <br /> (For Flows up to 1200 gpd) <br /> G.3. Calculate basal width ratio H.2.f, Multiply, dike multiplier by <br /> by dividing rock layer downslop•e mo�ind �eight to get <br /> loading rate of 1.20 gpd/ft2 downslope '"d�ike"widfh; ` � <br /> . by allowable soil loading y,35 x �, 2 =�„�. 9 g� . ' <br /> rate; � <br /> 1 . 20 �pd/f t� = �gpd/f t2 = z, 0 _ g• Compare the values of step H. 1 <br /> Check this value on page E-16. and step I�.2.f. Select, th.e <br /> �;reaEer of the two values as <br /> � 4 . rtultiply basal width ratio by the downslope dike width; <br /> rock layer width to get feet ' <br /> :equired basal width; h. Calculate �upslope+dike width <br /> Z , 0 � /O f t '= 2p f t usin� upslope mound t�eifiht . <br /> and upslope dike multiplier <br /> Fi. Do�,�nslope Dike Width , from pag� E-18; <br /> X ft <br /> 1. If landslope is 3% or more, i. Total mound width is the sum <br /> subtract rock layer w�dth of upslope dike width plus rocic <br /> from basal width to obtain layex �idth plus downslope dike <br /> minimum downslope dike toe width width; � - <br /> ft - ft = ft � ft + ft + ft = ' ft <br /> 2. Calculate mound height at edge 3. If landslope� is �2.�9 percen� or ' <br /> of rock layer on dowrislope side; less, basal. caidth i.ncludes betl� <br /> a . Determine depth o� �clean sand the upsl.ope and downslope diice <br /> ii11 at upslope ed�e of rock wid�hs. <br /> l�yer: /. 0 feet . <br /> b . "lultiply rock layer width by a. Calculate dowclslope dikc� �aicltl� <br /> landslope to determine drop usin�; steps 11.2,a, thrc>uf;h <br /> in elevation; H.2.f; ' % y�''�feeC ' ' ' . <br /> /. 0 X 2 % � 100 = O, �Z f t � b. Calculate upslo�e dike width <br /> c. Add drop in elevation to depth • using upslope mound heifiht r�nd <br /> of cl'ean sand at upslope edge ' � dike mu�.t���ier;`f,�am Pa,ge E-18; <br /> of rock layer to get depth of ,3.70 x �. Of t = //. /f t <br /> clean sand at downslope edge , c. Add downslope dike widEh to <br /> of rock layer. upslope dike width to rock <br /> 0. � ft + j, 0 ft =,�, � ft layer width to �et total mound • <br /> d. Add depth of clean sand at down- width•. � <br /> slope edge to depth of rock /„��9 f t�+ //./ f t + /p f t = ,�,5 E� <br /> layer to depth of soil backfill <br /> to get mound �height at downslope d• Compare total mound widtl� eo <br /> edge of rock layer; rec�uired basal w�.dr.h from step <br /> j, 2 ft +,75 ft +/.2$ft '=.�.Z ft G.4, If total mound width is <br /> — greater than required basal <br /> e. Enter table on page E-13 caith width, use calculateci dike <br /> landslope and downslope dike widths. If requ:�rQd liasal . <br /> ratio. Select dike multiplier width is �;reater than toeal <br /> of 'Y. 3S . motir►d width� is►ar�a�o dowi�slopw <br /> �=� !Yv/E dike width. " ' <br />