Simplified Table of Rational Method Runoff Coefficients (see references below) Ground CoverRunoff Coefficient, c Lawns0.05 - 0.35 Forest0.05 - 0.25 Cultivated land0.08-0.41 Meadow0.1 - 0.5 Parks, cemeteries0.1 - 0.25 Unimproved areas0.1 - 0.3 ...
This study develops a calibrated rational method to estimate flood discharges for drainage areas in Kansas up to 30 mi2.; Rational method runoff coefficients for six different recurrence intervals were calculated for watersheds in Kansas with at least 20 years of record. A regression analysis of ...
VOLUME 4 THE MODIFIED RATIONAL METHOD Although the rational method is a widespread and convenient method of urban storm drainage design, studies have suggested ways in which the method could be... D Ofenvironment 被引量: 11发表: 1981年 Runoff Estimation by Rational Method and SWMM in Vasai ...
In spite of the many criticisms regarding its over-simplification of the processes of rainfall conversion into runoff, it remains possibly the most widely used method for estimating peak flood flows for urban drainage systems and small (< 100 km2) rural catchments. However, as a result of the...
Version 2 is used in the United States, and was developed to estimate runoff volumes and hydrographs, using the same input data and coefficients as Rational Method along with the further assumption that the duration of peak-producing rainfall is also the entire storm duration (Akan, 2002; ...
The Rational Method Equation II. Runoff Coefficients III. Watershed Time of ConcentrationA. Single equation methodsB. Multiple equation methods IV. Design Rainfall Intensity V. Peak Storm Water Runoff Rate Calculations VI. The Steel Equation for Design Rainfall Intensity VI. Summary VII. References...
The method currently used in case of rivers with small catchment areas (less than 5 km) is the Rational Formula as it had been proposed by Diaconu (1994) using the updated values of runoff coefficients presented by Mi (2019). Taking full advantage of the tools offered by...