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
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:
Where:
AFR = Average Flow Rate in cu. ft./min
A = Area in acres
C = Runoff Coefficient
Rx = Runoff for area
TO = 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