40
S. Mandal and S. Biswas
Fig. 15 Correlation in
CFBP model for (15 +
1) years
-100
0
100
200
300
400
500
600
700
800
-20
30
80
130
180
230
0
5
10
15
20
25
30
35
40
45
50
Months
Rainfall depth (mm)
Runoff depth (mm)
Months
SCS-CN
FFBP
CFBP
Rainfall
Fig. 16 Simulated runoff data of SCS-CN, FFBP, and CFBP model for 48 months
from these models are very close to the peak values only. Medium range values were
too distributed in both cases. Correlation coefficient (R) value had shown a good
correlation between runoff and precipitation data set though data sets which were
not checked with the observed field data. Models are very responsive to peak values
for all the years. As they were mathematical models, runoff values have been shown
in (−ve) range for minimal rainfall values or no rainfall cases. Practically, those
values should be considered zero.