Miss. Code. tit. 11, pt. 6, ch. 1, subch. 2, exh. 11-6-1-2-C to Chapter 1, Subchapters 1 and 2

Current through January 14, 2025

Exhibit 11-6-1-2-C to Chapter 1, Subchapters 1 and 2 - VALUES OF RUNOFF COEFFICIENT C

TYPE OF DRAINAGE AREA RUNOFF COEFFICIENT, C

LAWNS:
SANDY SOIL, FLAT 2%	0.05-0.10
SANDY SOIL, AVERAGE, 2-7%	0.10-0.15
SANDY SOIL, STEEP, 7%	0.15-0.20
HEAVY SOIL, FLAT, 2%	0.13-0.17
HEAVY SOIL, AVERAGE, 2-7%	0.18-0.22
HEAVY SOIL, STEEP, 7%	0.25-0.35
BUSINESS:
DOWNTOWN AREAS	0.70-0.95
NEIGHBORHOOD AREAS	0.50-0.70
RESIDENTIAL:
SINGLE FAMILY AREAS	0.30-0.50
MULTI UNITS, DETACHED	0.40-0.60
MULTI UNITS, ATTACHED	0.60-0.75
SUBURBAN	0.25-0.40
APARTMENT DWELLING AREAS	0.50-0.70
INDUSTRIAL:
LIGHT AREAS	0.50-0.80
HEAVY AREAS	0.60-0.90
PARKS, CEMETERIES	0.10-0.25
PLAYGROUNDS	0.20-0.35
RAILROAD YARD AREAS	0.20-0.40
UNIMPROVED AREAS	0.10-0.30
STREETS:
ASPHALTIC	0.70-0.95
CONCRETE	0.80-0.95
BRICK	0.70-0.85
DRIVES AND WALKS	0.75-0.85
ROOFS	0.75-0.95

SOURCE: CHOW, V.T. 1964 Handbook of Applied Hydrology, McGraw Hill, Inc., New York, N.Y.

Calculation of Average Flow Rate:

Click Here To View Image

Where:

AFR = Average Flow Rate in cu. ft./min

A = Area in acres

C = Runoff Coefficient

R_x = Runoff for area

T_O = Total Runoff

Miss. Code. tit. 11, pt. 6, ch. 1, subch. 2, exh. 11-6-1-2-C to Chapter 1, Subchapters 1 and 2