Runoff Curve Number Method: Examination of the Initial Abstraction Ratio

2003 ◽  
Author(s):  
Donald E. Woodward ◽  
Richard H. Hawkins ◽  
Ruiyun Jiang ◽  
Allen T. Hjelmfelt, Jr. ◽  
Joseph A. Van Mullem ◽  
...  
Keyword(s):  
Curve Number ◽  
Initial Abstraction ◽  
Curve Number Method ◽  
Runoff Curve Number

Evolution of the SCS Runoff Curve Number Method and Its Application to Continuous Runoff Simulation

2012 ◽  
Vol 17 (11) ◽  
pp. 1221-1229 ◽  
Author(s):  
J. R. Williams ◽  
N. Kannan ◽  
X. Wang ◽  
C. Santhi ◽  
J. G. Arnold
Keyword(s):  
Curve Number ◽  
Runoff Simulation ◽  
Curve Number Method ◽  
Runoff Curve Number

scholarly journals Initial abstraction ratio and Curve Number estimation using rainfall and runoff data from a tropical watershed

RBRH ◽  
2019 ◽  
Vol 24 ◽  
Author(s):  
Luiz Claudio Galvão do Valle Junior ◽  
Dulce Buchala Bicca Rodrigues ◽  
Paulo Tarso Sanches de Oliveira
Keyword(s):  
Conversion Factor ◽  
Poor Performance ◽  
Curve Number ◽  
Storm Events ◽  
Rainfall Runoff ◽  
Initial Abstraction ◽  
Rainfall Depth ◽  
Standard Value ◽  
Tropical Watershed ◽  
Runoff Events

ABSTRACT The Curve Number (CN) method is extensively used for predict surface runoff from storm events. However, remain some uncertainties in the method, such as in the use of an initial abstraction (λ) standard value of 0.2 and on the choice of the most suitable CN values. Here, we compute λ and CN values using rainfall and runoff data to a rural basin located in Midwestern Brazil. We used 30 observed rainfall-runoff events with rainfall depth greater than 25 mm to derive associated CN values using five statistical methods. We noted λ values ranging from 0.005 to 0.455, with a median of 0.045, suggesting the use of λ = 0.05 instead of 0.2. We found a S0.2 to S0.05 conversion factor of 2.865. We also found negative values of Nash-Sutcliffe Efficiency (to the estimated and observed runoff). Therefore, our findings indicated that the CN method was not suitable to estimate runoff in the studied basin. This poor performance suggests that the runoff mechanisms in the studied area are dominated by subsurface stormflow.

An advanced soil moisture accounting procedure for SCS curve number method

2007 ◽  
Vol 21 (21) ◽  
pp. 2872-2881 ◽  
Author(s):  
R. K. Sahu ◽  
S. K. Mishra ◽  
T. I. Eldho ◽  
M. K. Jain
Keyword(s):  
Soil Moisture ◽  
Curve Number ◽  
Soil Moisture Accounting ◽  
Scs Curve Number ◽  
Curve Number Method ◽  
Accounting Procedure

Discussion of “Runoff Curve Number with Varying Site Moisture”

1979 ◽  
Vol 105 (4) ◽  
pp. 439-441 ◽  
Author(s):  
Robert E. Rallison ◽  
Roger C. Cronshey
Keyword(s):  
Curve Number ◽  
Runoff Curve Number
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