|WORLD METEOROLOGICAL ORGANIZATION||
|Explanation of the criteria for classification and numbering of components||
|Explanation of the dates on the component's description|
TABULAR METHOD FOR DETERMINING PEAK DISCHARGE (TR-55)
1. Purpose and objectives
This is a quick procedure for estimating peak rates of discharge for
use in designing soil and water conservation measures in agricultural
areas, and storm water management practices in urban areas.
The tabular method is used to develop composite hydrographs and peak
discharge rates for any point within a watershed. The watershed is divided into subareas, and time of concentration (Tc) for each area and the travel
time (Tt) through each reach are computed. The tabular method can be used
Estimates of peak rate of discharge and runoff volume for time of concentrations less than 2 hours and travel time less than 4 hours are read
from the tables.
5. Operational requirements and restrictions
a. An engineering technician who can calculate Tc can easily use this
6. Form of presentation
Presented as Chapter 5, Urban Hydrology for Small Watersheds - Technical Release No. 55, Natural Resources Conservation Service, U.S. Department of Agriculture, June 1986.
7. Operational experience
The technique is used extensively by the U. S. Natural Resources Conservation Service with good results, and is used worldwide.
8. Originator and technical support
Water Science Technology Team
10. Conditions on use
| Reclassified from J20.1.02 MAR 1987
(First entered: 12 JUL 82
Last updated: APR 98)