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<font size=3>'''Curve numbers for urban and agricultural areas. Source: [https://www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb1044171.pdf USDA Urban Hydrology for Small Watersheds - TR-55 '''.</font size><br>
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<font size=3>'''Curve numbers for urban and agricultural areas. Source: [https://www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb1044171.pdf USDA Urban Hydrology for Small Watersheds - TR-55]'''.</font size><br>
 
Link to this [[Curve numbers for urban and agricultural areas]]
 
Link to this [[Curve numbers for urban and agricultural areas]]
  

Revision as of 19:19, 24 December 2019

Curve numbers for urban and agricultural areas. Source: USDA Urban Hydrology for Small Watersheds - TR-55.
Link to this Curve numbers for urban and agricultural areas

Cover type and hydrologic condition Soil Group A Soil Group B Soil Group C Soil Group D
Open space (<50% cover) 68 79 86 89
Open space (50-75% cover) 49 69 79 84
Open space (<75% cover) 39 61 74 80
Impervious surfaces 98 98 98 98
Commercial (85% impervious) 89 92 94 95
Industrial (72% impervious) 81 88 91 93
Residential (65% impervious) 77 85 90 92
Residential (30% impervious) 57 72 81 86
Residential (12% impervious) 46 65 77 82
Pervious, no vegetation (newly graded) 77 86 91 94
Fallow with residue cover 74-76 83-85 88-90 90-93
Row crop, no residue 67-72 78-81 85-88 89-91
Row crop with residue 64-71 75-80 82-87 85-90
Pasture, good condition 39 61 74 80
Pasture, poor condition 68 79 86 89
Meadow 30 58 71 78
Woods, good condition 32 58 72 79
Woods, poor condition 57 73 82 86