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While other inputs, such as θ and N, were kept unchanged, in general, using Rad-P produced lower peaks than using the Sat-P (≈observed) in both of the watersheds (Table 4). Although the total Sat-P and Rad-P rainfalls were not much different, the estimated time to peak of the Rad-P was 0.73 hours later than that using Sat-P in Nam Kim and 0.26 hours later than that in Nam Khat.

Table 4

Comparing the simulated discharge using the Sat-P and Rad-P for the R23rd event

Parameters/WatershedsPeak discharge (m3 s−1)
Lags (hour)
 Accumulative rainfall (mm)
Sat-PRad-PObservedSat-PRad-PSoil moisture (%)Sat-PRad-P
NAM KIM 314.3 189.2 306.2 4.4 5.13 46 144.4 133.3 
NAM KHAT 191.5 108.7 – 1.67 2.02 42 135.5 113.1 
Parameters/WatershedsPeak discharge (m3 s−1)
Lags (hour)
 Accumulative rainfall (mm)
Sat-PRad-PObservedSat-PRad-PSoil moisture (%)Sat-PRad-P
NAM KIM 314.3 189.2 306.2 4.4 5.13 46 144.4 133.3 
NAM KHAT 191.5 108.7 – 1.67 2.02 42 135.5 113.1 

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