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− | {{ | + | ==Curve numbers for urban and agricultural areas== |

+ | The following table was adapted from [https://www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb1044171.pdf USDA Urban Hydrology for Small Watersheds - TR-55]. | ||

+ | |||

+ | {{:Curve numbers for urban and agricultural areas}} | ||

+ | |||

+ | ==Runoff coefficients for different soil groups and slopes== | ||

+ | The following table was adapted from Hydrologic Analysis and Design (4th Edition) (McCuen). | ||

+ | |||

+ | {{:Runoff coefficients for different soil groups and slopes}} | ||

+ | |||

+ | ==Other sources of information for curve numbers== | ||

+ | *[https://www.pca.state.mn.us/sites/default/files/p-gen3-12f.pdf MPCA MIDS memo: Regional Hydrologic Metrics – Curve Numbers] | ||

+ | *[https://www.wcc.nrcs.usda.gov/ftpref/wntsc/H&H/training/runoff-curve-numbers1.pdf Hydrology Training Series, Module 104, Runoff Curve Number Computations] | ||

+ | *[https://engineering.purdue.edu/mapserve/LTHIA7/documentation/scs.htm SCS Curve Number Method] | ||

+ | *[http://njscdea.ncdea.org/CurveNumbers.pdf Basic Hydrology – Runoff Curve Numbers] | ||

+ | *[https://www.hydrocad.net/curvenumber.htm HydroCAD Curve Number] | ||

+ | *[https://www.wsdot.wa.gov/publications/fulltext/Hydraulics/HRM/App4B_2014.pdf TR-55 Curve Number Tables] | ||

+ | |||

+ | ==Other sources of information on runoff coefficients== | ||

+ | *[https://www.waterboards.ca.gov/water_issues/programs/swamp/docs/cwt/guidance/513.pdf Runoff coefficient fact sheet] | ||

+ | *[https://www.brighthubengineering.com/hydraulics-civil-engineering/93173-runoff-coefficients-for-use-in-rational-method-calculations/ Rational Method Runoff Coefficient Tables for Storm Water Runoff Calculation] | ||

+ | *[https://www.njstormwater.org/bmp_manual/NJ_SWBMP_5%20print.pdf Computing Stormwater Runoff Rates and Volumes] | ||

+ | *[https://pdhonline.com/courses/h119/stormwater%20runoff.pdf Estimating Storm Water Runoff] | ||

+ | *[https://www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb1083019.pdf Hydrology Training Series Module 206 D - Peak Discharge] | ||

+ | *[http://onlinemanuals.txdot.gov/txdotmanuals/hyd/rational_method.htm Hydraulic Design Manual - Section 12: Rational Method] | ||

+ | *[https://www.lmnoeng.com/Hydrology/rational.php Rational Equation Calculator] |

The following table was adapted from USDA Urban Hydrology for Small Watersheds - TR-55.

**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 poor condition (<50% cover) | 68 | 79 | 86 | 89 |

Open space average condition (50-75% cover) | 49 | 69 | 79 | 84 |

Open space good condition (>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 |

The following table was adapted from Hydrologic Analysis and Design (4th Edition) (McCuen).

**Runoff coefficients for different soil groups and slopes. Coefficients are for recurrence intervals less than 25 years. Source: Hydrologic Analysis and Design (4th Edition) (McCuen**.

Link to this table

Land use | Soil Group A | Soil Group B | Soil Group C | Soil Group D | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|

0-2% | 2-6% | >6% | 0-2% | 2-6% | >6% | 0-2% | 2-6% | >6% | 0-2% | 2-6% | >6% | |

Residential (65% impervious) | 0.25 | 0.28 | 0.31 | 0.27 | 0.30 | 0.35 | 0.30 | 0.33 | 0.38 | 0.33 | 0.36 | 0.42 |

Residential (30% impervious) | 0.19 | 0.23 | 0.26 | 0.22 | 0.26 | 0.30 | 0.25 | 0.29 | 0.34 | 0.28 | 0.32 | 0.39 |

Residential (12% impervious) | 0.14 | 0.19 | 0.22 | 0.17 | 0.21 | 0.26 | 0.20 | 0.25 | 0.31 | 0.24 | 0.29 | 0.35 |

Commercial | 0.71 | 0.71 | 0.72 | 0.71 | 0.72 | 0.72 | 0.72 | 0.72 | 0.72 | 0.72 | 0.72 | 0.72 |

Industrial | 0.67 | 0.68 | 0.68 | 0.68 | 0.68 | 0.69 | 0.68 | 0.69 | 0.69 | 0.69 | 0.69 | 0.70 |

Streets | 0.70 | 0.71 | 0.72 | 0.71 | 0.72 | 0.74 | 0.72 | 0.73 | 0.76 | 0.73 | 0.75 | 0.78 |

Parking | 0.85 | 0.86 | 0.87 | 0.85 | 0.86 | 0.87 | 0.85 | 0.86 | 0.87 | 0.85 | 0.86 | 0.87 |

Open space | 0.05 | 0.10 | 0.14 | 0.08 | 0.13 | 0.19 | 0.12 | 0.17 | 0.24 | 0.16 | 0.21 | 0.28 |

Cultivated land | 0.08 | 0.13 | 0.16 | 0.11 | 0.15 | 0.21 | 0.14 | 0.19 | 0.26 | 0.18 | 0.23 | 0.31 |

Pasture | 0.12 | 0.20 | 0.30 | 0.18 | 0.28 | 0.37 | 0.24 | 0.34 | 0.44 | 0.30 | 0.40 | 0.50 |

Meadow | 0.10 | 0.16 | 0.25 | 0.14 | 0.22 | 0.30 | 0.20 | 0.28 | 0.36 | 0.24 | 0.30 | 0.40 |

Forest | 0.05 | 0.08 | 0.11 | 0.08 | 0.11 | 0.14 | 0.10 | 0.13 | 0.16 | 0.12 | 0.16 | 0.20 |

- MPCA MIDS memo: Regional Hydrologic Metrics – Curve Numbers
- Hydrology Training Series, Module 104, Runoff Curve Number Computations
- SCS Curve Number Method
- Basic Hydrology – Runoff Curve Numbers
- HydroCAD Curve Number
- TR-55 Curve Number Tables

- Runoff coefficient fact sheet
- Rational Method Runoff Coefficient Tables for Storm Water Runoff Calculation
- Computing Stormwater Runoff Rates and Volumes
- Estimating Storm Water Runoff
- Hydrology Training Series Module 206 D - Peak Discharge
- Hydraulic Design Manual - Section 12: Rational Method
- Rational Equation Calculator

This page was last edited on 13 January 2020, at 15:15.

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