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� S. TRENCH OR BED BOTTOM AREA <br /> H. Fa b'enches wifh 6 inches of rock below the pipe: <br /> AxF= �X - }� = � <br /> - <br /> i. For tr�che:with 12 incha ot rock b�low th�pipr. <br /> A x F x O.E� 300 �d x 2.2 Rl�d x 0.3 = �,p � <br /> J. For b�enches witlt 18 inches of rock below the pipe: <br /> A x F x 0.66= gpd x Nqpd x 0.66= � <br /> K. Fa lrenches with 24 inches of rock bebw the pipe: <br /> A x F x 0.6= gpd x 1tl�d x 0.6= � <br /> L. For yravity beds with 6 a 12 inches of rock bebw the pipe; <br /> 1.SxAxF=1.5x gpdx rygpd = �Z <br /> M. For pressure beds with 6 or 12 inches of rock bebw the pipe; <br /> A x F= gpd x itl�cf = fl <br /> 4. DISTRIBUTION Check ad that aPP�Y) <br /> �t���) X Drop Boxes(anY sbPe) Rodc <br /> X Trenches Dis8nbu6on Box(<3%) X Chamber <br /> �� � Grav�eiess <br /> S. 5Y5�EY WIDTH,LENGTH AND VOLUME <br /> M. Select widlh= 3A ft <br /> N. If using rock.�vide bMOom area b width:(H,�,J or K)�ivided by P=ineal feet <br /> ft/ � = hneal feet <br /> Rodc depth below�str�ution pipe plus 0.5 foot times botbom arear <br /> (Rodc depfh+0.5 x Ar�ea ,I,J,K,L) <br /> ( ft+0.51�x �_� }� _ � <br /> Vdurne in cubic yards=volume in cubic fieet d'rvided by 27 <br /> / 27= yd3 <br /> Weight of rock in tons=cubic yards times 1.4 <br /> x 1.4= bns <br /> 0. IF using 10'Gravelless�ipe,length=Flow(A)x GraveAess SSF see Gg�re D-9) <br /> 9Pd X � ft�d = 5neal feet <br /> P. IF using�Chamber H,I,J,K �aed on height of chamber sl�]dvidad by width of ch�mber In ftj <br /> 528.0 ft2 1 3.0 ft = 176.0 Bneal feet <br /> Page 2 of 2 <br />