Data source and availability
Hydrological and meteorological
data such as daily streamflow and
precipitation has been measured since
1920s and is available from the
Mekong River Commission (MRC)
and the Department of Meteorology
and Hydrology of the LaoPDR (DMH),
but includes discontinuities and
missing data values (Table 1). Data
measured in recent two decades are
used in this study even these data
includes missing values during a
certain period and thus the number of
measurement sites suit for trend
analysis is limited. Figure 2 and 3
show the locations of streamflow and
rainfall gauging sites, of which data
obtained at stations listed in Table 1 is
used for analysis. Data availability is
summarized in Table 1, in which the
number of month with missing data is
specified. In addition, a gridded
rainfall data (Yatagai et al., 2008),
which was interpolated from multiplepoints
rainfall data, is utilized to
consider spatial variability of rainfalover large mountainous areas.