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i I J :ai FLUENTS `-• .- t. SIZING A DISPOSAL FIELD 79 .t yr: Table VIII. Ryon's Pert Rates Related to Various Parameters of s �^ Loading Rates of Septic-Tank Effluents onto soils of Disposal Trenches' PITS Loading Rate Coefficient (Sal/ft'/day) r !3 0( Percolation I -[ Bottom Area I - Permeability Rate Sidewall Functional (ft/min) - (min/in.) Ryon Federici[ Area Arm LTAR - " y6 5.3 .-12. 4.0 2.3 t/a 5.0 10. 3.8 2.1 ' a` •1j 1/r 4.7 7.1 3.5 2.0 a• sja 4.4 5.8 3.3 1.9 dr 2.0 • 10-Z 1 4.0 5.0 3.0 1.7 0.80 _-_ - -- - 6.7 - 10-1 2 3.2 3.5 2.4 1.4 0.58 3.6 • 10'1 . 3 2.8 2.9 2.1 1.2 0.51 tly loaded to capacity 2.3 - 10 4 2.4 2.5 1.8 1.0 0.46 1.6 • 10-3 5 2.2 2.2 1.7 -0.95 0.44 Jed at times 5.5 = 104 10 1.7 `1.6 1.2 ` 0.72 0.37 sing at time of inspection 2,9 • 10'4 15 1.3 1.3 1.0 0.57 0.34 Lina incl 1� 30 0.84 0.75 0.63 0.36 0.30 � :inn including all points 3 I 451/ 0.62 0.75 0.66 0.26 0.28 3. 10-1 60 0.48 0.65 0.36 0.21 0.27 I 2.4 • 10-5 >75 0.44 0.58 0.33 0.19 0.26 1.2 = 10 120 ' 0.23 0.46 0.17 0.10 0.24 , on 9.6 • 10-7 600 0.08 0.20 0.060 0.03 0.20 s 'Ryon's interpretation of his data [22]. Fedcrick's formula [67]. sidewall Area assumed -At a Ryon's loading rates and his drawing of trenches I ft wide and with 8 in.of sidewall height I -r- -p- -- -- [22].Functional Area assumed both bottom and sidewall areas equal,and has been related to r 65 50 55 60 65 70 75 Ryon's loading rates.Long-Term Acceptance Rates(LTAR)were calculated on the basis of +aces it, Darcy's coefficient of permeability [6]: it was estimated by a correlation formula to percolation rates [29]; it/min • 0.51 = cm;sec; and, LTAR applies to Functional Area. t [ems for various percolation estimates because many trenches nowadays are not designed to be j inundated much above distribution pipes. Nevertheless,the trenches used in Ryon's day had the geometry of shallow subsurface drains.It is entirely i possible that top surfaces of the troubled systems Ryon studied were d making arithmetical serving to infiltrate surcharged septic-tank effluents, as well as sidewalls The data in the table and bottoms. Ryon apparently used of his tables. Cesspools and Disposal Pits p I translated into what -ed surfaces other than During the last few decades, cesspools have found less favor than s. (As mentioned, the gravel-filled disposal fields,separate of the septic tank itself.Thus,Ryon's � value to bottom and studies of cesspools have not been widely used. 'ewalls superior.) Ryon presented a table giving loading rates of leaching cesspools(also es were not included in disposal pits) with corresponding percolation rates. Notwithstanding f i i t � s 1 � 3 P 7 - L `ar t:�:1♦G�� _".,...J..s e"�w�:A� ��uG�...�Jm4<5:.:.Jad - 1'S..� ..`5......�"..ir$+». '