## 2 Materials and Methods
### Obtained data  
Daily observed rainfall data (for 2004-2014) at three stations with station IDs 640112 (A. Dong Luang), 640122 (A. Wan Yai), and 640150 (A. Huai Ta Poe) were collected from the Royal Irrigation Department (RID) of Thailand. In addition, daily observed streamflow data at 'Station kh.92' (Ban Kan Luang Dong, Dong Luang), draining an area of 1118 km2 (for 2007-2014), were also obtained from the RID. The drainage map of the HBS was collected from the Deutsche Gesellschaft fur Internationale Zusammenarbeit (GIZ) office in Thailand. These stations and the drainage map are shown in Figure 1.  
Figure 2a-c illustrate the topography (through the Digital Elevation Model), land-use, and soil cover of the HBS watershed. The Digital Elevation Model (DEM) of a 30 m \(\times\) 30 m resolution was downloaded from the United States Geological Survey website accessible through [[https://earthexplorer.usgs.gov/](https://earthexplorer.usgs.gov/)]([https://earthexplorer.usgs.gov/](https://earthexplorer.usgs.gov/)) (accessed on 25 September 2020) (refer to Figure 2a). In addition, the land-use data of 500 m resolution and scale of 1:50,000 and soil cover maps with 1 km resolution and scale of 1:100,000 for the year 2015 were obtained from the Land Development Department (LDD) of Thailand (refer to Figure 2b,c). The elevation of the watershed ranges from 0 to 636 m above mean sea level. The main land-use types of the study area are deciduous forests, cassava, and rubber plantations, which cover nearly 67%, 13%, and 6% of the land area, respectively. Most of the land in HBS is covered by Hang Chat, which has a loamy sand texture.  
Figure 1: Hydro-meteorological network and stream network in the HBS watershed.  
Satellite-Based Precipitation Products (SbPPs) and Ground-Based Gridded Precipitation Products (GbGPPs)  
Table 1 provides the information of SbPPs and GbGPPs used in this study. PERSIANN products are available through [[https://chrsdata.eng.uci.edu/](https://chrsdata.eng.uci.edu/)]([https://chrsdata.eng.uci.edu/](https://chrsdata.eng.uci.edu/)) (Accessed on 15 September 2020) whereas the TRMM products including TMPA-3B42 (version 7), TMPA-RT (version 7) and IMERG (version 6B) products are available from [[https://disc.gsfc.nasa.gov/](https://disc.gsfc.nasa.gov/)]([https://disc.gsfc.nasa.gov/](https://disc.gsfc.nasa.gov/)) (Accessed on 20 September 2020). In addition, MSWEP (version 1.1) is available from [[http://www.gloh2o.org/](http://www.gloh2o.org/)]([http://www.gloh2o.org/](http://www.gloh2o.org/)) (Accessed on 25 September 2020). Furthermore, three GbGPPS, APHRODITE-products (version 1801 and version 1901), and GPCC (version 1) are accessible through [[http://aphrodite.st.hirosaki-u.ac.jp/products.html](http://aphrodite.st.hirosaki-u.ac.jp/products.html)]([http://aphrodite.st.hirosaki-u.ac.jp/products.html](http://aphrodite.st.hirosaki-u.ac.jp/products.html)) (Accessed on 25 September 2020) and [[https://climatedataguide.ucar.edu/climate-data/gpcc-global-precipitation-climatology-centre](https://climatedataguide.ucar.edu/climate-data/gpcc-global-precipitation-climatology-centre)]([https://climatedataguide.ucar.edu/climate-data/gpcc-global-precipitation-climatology-centre](https://climatedataguide.ucar.edu/climate-data/gpcc-global-precipitation-climatology-centre)) (Accessed on 25 September 2020) respectively.  
Figure 2: Details of the HBS watershed (a) Digital elevation model; (b) Land-use patterns; (c) Soil cover.