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11�1b/1b�5 13:39 32H2382343 HENTGES PAGE 07 <br /> � E. Design, Syst,em I�ngth <br /> 1. For trenches with 6 inches of roek below the pipe; <br /> D1 / Uench widfih: _ / �� equals f�;� <br /> --,..__ <br /> • 2. For trenches with 12 inches of rock below the pipe: I <br /> �2 / �rench vdidth: = � / � equals �et <br /> 3. Fcr 12 inch rock ttench with nv reductio�t; <br /> D3 / trench width: _ / � equals ¢��t <br /> �_ <br /> 4. For 8" di�tne�er gravelless pipe: <br /> D 4 / trench �ridth: = / 20 equals � �� <br /> � <br /> 5. For 10" diameter gravelless pipe: <br /> D5 / trench v►eidth: _ / � equels � �t <br /> B. For 34 in wide, 6 in louvered chambe��y��tem: <br /> D6 / t�ench wi�fit�: � 125�2.S0 . / �3 eq�,als 417.5 feef � <br /> ?, For rock beds, chaose system wid{h; =�R wide <br /> D7 / bed width above: _ � / � equals �� <br /> � <br /> ( <br /> pAGE 4 OF 1 p <br /> L 'd Z6l 'ON hNddWO� h��38Nda Wb'00 � l l SOOl '8 '�30 <br />