HRU name Observed (mm) (2001-2010) RCM simulated Bias corrected Absolute value (mm) % change Absolute value (mm) % change Salawin 1190 ± 47 1042 ± 55 -12.46 1157 ± 34 -2.78 Mae Kok 1730 ± 63 1321 ± 78 -23.65 1645 ± 45 -4.88 Mae Khong 1944 ± 127 2122 ± 141 9.16 2001 ± 114 2.94 Chao Phraya 1076 ± 162 1432 ± 154 33.09 1119 ± 148 4 Mae Klong 1612 ± 27 1578 ± 45 -2.11 1602 ± 31 -0.63 Bang Pakong 1422 ± 44 1332 ± 64 -6.37 1401 ± 47 -1.46 Eastern Gulf 1908 ± 96 1515 ± 75 -20.61 1834 ± 91 -3.89 Western Gulf 1063 ± 89 1432 ± 78 34.72 1134 ± 92 6.65 Southern 2221 ± 124 2850 ± 98 28.33 2336 ± 137 5.17

Table 1: Comparison of RCM simulated and bias corrected average annual precipitation values with the observed precipitation.