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It is observed that the GPM-IMERGV6 and TRMM-3B42V7 have frequent very light rain indicating a high false alarm rate. However, the PERSIANN-CDR (943 days) have a more or less similar number of rainy days with the IMD (930 days) (see Table 6). The IMD receives 1.6% of the total rainfall in terms of precipitation amount, while the GPM, TRMM-3B42V7, and PERSIANN-CDR receive 2.8, 2.1, and 1%, respectively.

Table 6

Comparison of statistical metrics of all precipitation products for spring, summer, fall and winter seasons during 2000 to 2018 at watershed scale

Statistical IndicatorSpring
Summer
Fall
Winter
TRMMGPMPERSIANNTRMMGPMPERSIANNTRMMGPMPERSIANNTRMMGPMPERSIANN
CC 0.18 0.21 0.16 0.35 0.41 0.29 0.47 0.50 0.41 0.30 0.19 0.03 
RMSE 94.68 78.72 154.37 200.74 195.54 256.05 159.39 152.26 158.26 32.30 31.33 28.32 
MAE 37.75 33.25 67.72 121.00 113.68 157.37 41.43 40.31 41.30 6.67 6.44 5.20 
SD 76.02 52.29 142.75 185.60 193.59 240.81 144.29 137.7 116.89 26.56 20.61 3.89 
Percent Bias (%) −23.96 0.98 −170.73 −16.88 −10.48 −57.42 10.03 14.78 23.19 5.98 29.57 90.76 
Statistical IndicatorSpring
Summer
Fall
Winter
TRMMGPMPERSIANNTRMMGPMPERSIANNTRMMGPMPERSIANNTRMMGPMPERSIANN
CC 0.18 0.21 0.16 0.35 0.41 0.29 0.47 0.50 0.41 0.30 0.19 0.03 
RMSE 94.68 78.72 154.37 200.74 195.54 256.05 159.39 152.26 158.26 32.30 31.33 28.32 
MAE 37.75 33.25 67.72 121.00 113.68 157.37 41.43 40.31 41.30 6.67 6.44 5.20 
SD 76.02 52.29 142.75 185.60 193.59 240.81 144.29 137.7 116.89 26.56 20.61 3.89 
Percent Bias (%) −23.96 0.98 −170.73 −16.88 −10.48 −57.42 10.03 14.78 23.19 5.98 29.57 90.76 
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