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<br />~ ~ ~ .................--..-..-- ---"---- <br /> <br />- <br /> <br />- <br /> <br />- <br /> <br /> 8 <br /> ll> <br />. tJ' <br />: I-' <br />. FREQUENCY CD <br />~ LAND USE DR PERCENT <br />. SURFACE CHARACTERISTICS IMPERVIOUS 2 5 10 100 Ul <br />~ 50 <br />. Business: I-' <br /> Coamercta 1 Areas 95 .87 .87 .88 .89 0 <br /> 0 <br /> Neighborhood Areas 70 .60 .65 .70 .80 0 B~ <br /> Residential: 40 0 "l::l <br /> Sin91e-Fa.l1y * .40 .45 .50 " .60 no <br /> tlHl <br /> Multi-Unit (detached) 50 .45 .50 .60 .70 0 - ,.." <br /> .. <br /> Nulti-Unit (attached) 70 .60 .65 .70 .80 I-'n <br /> * .30 .35 .40 .60 ... 1-'0 <br /> 1/2 Acre Lot or Larger w 30 0 I CD <br /> Apartments 70 .65 .70 .70 .80 a: I-' Hl <br /> ... I Hl <br /> Industrlal: Ie 1-" <br /> en on <br /> Li9ht Areas 80 .71 .72 .76 .82 ::> ~..... <br /> 2 CD l <br /> Heavy Acres 90 .80 .80 .85 .90 > 20 ::l <br /> a: <br />1. 7 .10 .18 .25 .45 w ("T <br />Parks. Cemetaries: Q. lJl <br />Playqrounds: 13 .15 .20 .30 .50 :lE <br /> Hl <br />Schoo 15: 50 .45 .50 .60 .70 0 <br /> t1 <br /> I-' Ra i1 road Yard Areas 20 .20 .25 .35 .45 10 <br /> tv OENSITY ("T <br /> Undeveloped Areas: LOW OENSITY MEDIUM ::T <br /> Historic Flow Analysis- 2 (See -lawns.) CD <br /> :<l <br /> Greenbelts. Agricultural llJ <br /> 0 ("T <br /> Offslte Flow Analysis 45 .43 .47 .55 .65 2 3 4 5 1-" <br /> (when land use not defined) C- O <br /> HOUSING DENSITY - UNITS PER ACRE ::l <br /> Streets: llJ <br /> PAVed 100 .87 .88 .90 .93 I-' <br /> Gravel (Packed) 40 .40 .45 .50 .60 FIGURE 2-1- RESIDENTIAL HOUSING DENSITY :<: <br /> CD <br /> Drive and Walks: 96 .87 .87 .88 .89 vs. ("T <br /> 90 .80 .85 .90 .90 IMPERVIOUS AREA ::T <br /> Roofs: 0 <br /> lawl'ls. Sandy So 11 0 .00 .01 .05 .20 Q. <br /> lawns. Clayey Sol1 0 .05 .15 .25 .50 Hl <br /> NOTE: These Rational Formula coefficients may not be valid for large basins. ti <br /> 0 <br /> S <br /> .See Figure 2-1 for percent impervious. <br />