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)