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<br /> ' , ' , MOUND DESIGN WORKSHEEI'
<br /> (For Flows up to 1200 gpd) � . .. __.. ' .
<br /> �' .�. e,.,.FLOW . ' • D-7 '
<br /> .'� • ' ��;:stimated �5� gpd (see pages �-7 or I-3 4 5) a"�"m'""��°"�°��°�
<br /> � � r�a tnri s owwcc�
<br /> or measured gpd. °�"°°'° _ ° � a
<br /> f 700 ti! iq �
<br /> 1 YO 700 fl• �
<br /> • �00 37! bt """`
<br /> B. SEPTTC TAIVK LIQUID VOLUMES
<br /> � t00 W �Sf ++,L
<br /> � I000 �00 �7'0 ~
<br /> �, )nc�o gallons (see pages C-3 or C-5) � �� � �« �-
<br /> , � _�_ .
<br /> � � C-3
<br /> C. S�R$ (IP.fET f0 SIt2 2S�dIL13t10I1� wrK T�wc ur,�cnus, w a►«oNs
<br /> 1. Depth to restricting layer= )� inches '�--'d � `='��
<br /> soo� uae eu�an Nwo�u
<br /> 2. Depth of percolation tests = I a inches ,,,,,. ,.. ,,,.
<br /> 3. Percolation nte ���� mpi '�.�r �,a :'— '°'• ,••: ,•••
<br /> • 4. Land slope � � o %'o •�• ,••• "••
<br /> ��a� �... �...
<br /> �
<br /> D. ROCK LAYER DIMINSIONS
<br /> 1. ' Multiply flow rate by 0.83 to obtain required area of rock '__
<br /> r
<br /> layer: A x 0.83 = \ w
<br /> usa gpd x 0. 3 sq. ft./gpd = � S�sq. ft. �
<br /> 2. Select width of rock layer (IO feet or less) = i 0 ft. `
<br /> 3. Length of rock layer = area+width=
<br /> � So sq. ft.+ ,�_ft. _�ft. Rock Eed
<br /> � f.,.,.;.�.,.,.,...,.,.,.,....
<br /> :...� .�...�..., ,.,.,.,.�.�.
<br /> � f''''''"''''''''''''''''''''
<br /> ti•�•�.�•�•�•�•ti.� `•�•ti.�.�•�• dth S20 ft
<br /> �.f•r•i•i•r•r•�•i•i•�•r•r•�•♦
<br /> ti•�.�•�.ti•ti.�•�•� �.�•�•�•�•�•
<br /> .��f�f.�./.�.��/��.�.j�I.��1�1
<br /> � E. ROCK VOLUME �— �-�+s� —�
<br /> 1. Multiply rock area by rock depth to get cubic feet of rock;
<br /> � �) Sbsq. ft.x�ft. =�-,�5 cu.ft.
<br /> 2. Divide cu. ft.by 27 cu. ft./cu. yd. to get cubic yards;
<br /> L�,�cu. ft. +27=�cu.yd. :
<br /> 3. Multiply cubic yards by 1.4 to get weight of rock in tons; �
<br /> l�cu.yd. x 1.4 ton/cu. yd. = 3. tons.
<br /> �
<br /> F. ADSORPTION WIDTH
<br /> 1. Percolation rate in top 12 inches of soil is�I �� mpi E-16
<br /> 2. Select allowable soil loadin rate from table on page E-16; •�•�-����d���
<br /> gpd�ft2 ►--�- �--�-•_
<br /> 3. Calculate adsorption width ratio by dividing rock layer '"" `"" `"" """ ""r`"'�"
<br /> • loading rate of 1.20 gpd/ft2 by allowable soil loading rate; ���� � �� �� ��~ � ��~
<br /> . ... ..,. .�. ..., �...
<br /> �• .1� �.N �1� �.N �.M
<br /> f� .H �.M �I� !.Y 1.��
<br /> � � y� �� �d _ .. ... .... ..,, ,..� ....
<br /> 1.20 d it2 /ft2= I � . ., .,�. .�. .•. .... ....
<br /> Check this value on page E-16. '
<br /> 4. Multiply adsorption width ratio by rock layer width to get
<br /> required adsorption width;
<br />`� � I , S x 1 o ft =�5 ft ,
<br /> � .
<br /> : :
<br /> J .
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