1331 MADRONA AVE 2016-01-01 MF Import

Table 3-2.2 Roof Runoff Infiltra[ion System Sizing Trench Dimensions Required Length of Trench per ] 00 square feet of Roof Sudace** width depth* coarse sand sand loamy sand sandy loam loam I.5 ft. 1.0 ft. 0.72 1.44 33II 5.48 7.88 1.5 ft. 0.56 1.10 2.54 4.08 5.80 2.0 R. 0.45 0.89 2.06 330 4.60 2.5 ft. 033 0.75 1.72 2.76 3.34 3A tt. 032 O.GS 1.49 238 3.28 2A ft. I.0 ft. 0.60 1.I9 2.68 434 6.22 I.5 ft. O.a7 0.92 2.04 3.'LS 4.ti2 2.0 ft. 039 0.76 1.66 2.66 3.70 2.5 ft. 033 0.65 1.41 2.26 3.10 3A ft. 0.28 0.56 I�3 1.94 2.68 2S ft. 1.0 ft. 0.5] 1.01 2.24 3.64 5.14 I.5 ft. (1.4] 0.79 1.71 2.7G 3.88 2.0 R. 034 0.66 1.40 2�6 3.14 2.5 ft. 0?9 0.56 1.20 1.90 2.66 3.0 ft. 0.25 O.d9 1.05 I.65 230 3A ft. I A ft. 0.44 0.88 I92 3.10 4.40 I.5 ft. 036 0.69 1.47 2.38 336 2.Oft. 030 0.53 ]?1 1.94 2J4 2.5 fc 0 25 0.50 I.04 1.65 232 3.0 ft. 0.?2 0.44 0.91 1.43 2.00 3.5 ft. ].0 ft. 0.39 0.73 1.63 2.72 3.88 I.5 ft. 0.32 0.62 1:L9 2.08 3.96 2.0 tt. C.26 0.51 1.07 I JO 2.42 2.5 ft. 0.23 0.44 092 1.45 2.06 3A ft. 0.20 039 0.81 I:L7 1.79 4.O ft IA ft. 035 0.;0 I.49 2.42 3.46 {.5 ft. 0.28 0.55 1.15 1.85 2.66 2.0 ft. 0.?4 0.�36 0.95 1.52 2.18 2.5 ft. 0.20 G.40 0.82 130 1.86 3A ft. 0.13 035 0.73 1.13 1.62 *llepth refen [o [he depth of washeU rock, not tlepth trom surtace **Soil rextures to be determined using the results of soil gradation tests and the USDA Texmral Triangle. Example: An infiltration irench 3.5 feet wide snd 2 feet de�o, dug in sandy loam soils, for runoff from a I500 squ�re Foot roof, would be '_'S.� feet lon� (chart value of 1.70 multiplied by l�). �5