characterized by wet winters and dry summers. The annual average
precipitation is 667 mm, while the annual average temperature
is about 18 °C (Briak et al., 2016). The hydrological monitoring
is ensured by the hydrometric station located at the outfall Kalaya
(reservoir). The representation of relief chosen for this study is the
ASTER - GDEM satellite with a spatial resolution of 30 m. Use of
this resolution in watershed modeling is widely demonstrated
(Hirt, Filmer, & Featherstone, 2010). Surroundings for the most
part formed of little rough hills with comparatively low height.