# Hydrological Analysis of Extreme Rain Events in a Medium-Sized Basin
## Materials and Methods
### Hydrological Model HBV-Light, Setup and Methods
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**No** & **Warm-Up Start** & **Warm-Up End** & **Simulation Start** & **Simulation End** \\  & **Date/Time** & **Date/Time** & **Date/Time** & **Date/Time** \\ \hline
1 & 28 May 2012 00:00 & 27 May 2013 23:00 & 28 May 2013 00:00 & 31 May 2013 00:00 \\
2 & 04 July 2012 00:00 & 03 July 2013 23:00 & 04 July 2013 00:00 & 11 July 2013 00:00 \\
3 & 07 April 2012 00:00 & 06 April 2013 23:00 & 07 April 2013 00:00 & 16 April 2013 00:00 \\
4 & 30 April 2016 00:00 & 29 April 2017 23:00 & 30 April 2017 00:00 & 08 May 2017 00:00 \\
5 & 26 June 2009 00:00 & 25 June 2010 20:00 & 26 June 2010 00:00 & 01 July 2010 00:00 \\
6 & 22 June 2016 00:00 & 21 June 2017 23:00 & 22 June 2017 00:00 & 26 June 2017 00:00 \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Warm-up and simulation periods for each studied event, per sub-basin. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Sub-Basin** & **\% Forests/Wetlands** & **\% Croplands** & **\% Urban** \\ \hline W1460 & 49.8 & 39.7 & 10.5 \\ W790 & 18.7 & 68.2 & 13.1 \\ W800 & 21.4 & 52.8 & 25.8 \\ W900 & 7.8 & 69.1 & 23.1 \\ W1030 & 0.2 & 2.1 & 97.7 \\ W1020 & 9.7 & 35.4 & 54.9 \\ \hline \hline \end{tabular}
\end{table} 
Table 8: Vegetation classes of the six studied sub-basins. Routine, representing actual evaporation and groundwater recharge as functions of water storage capacity for each elevation zone or vegetation class; (c) the Response Routine, calculating the outflow as a function of groundwater level stored; and (d) the Routing Routine, simulating the routing of the discharge to the watershed's outlet through a triangular weighting function [54]. The parameters regarding the snow routine are: a threshold air temperature (_TT_) (\({}^{\circ}\)C) according to which precipitation is assumed to be snow or rain, a degree-hour factor (_CFMAX_) (mm/h \({}^{\circ}\)C) used to calculate snowmelt, a seasonal variability in the degree-hour factor (_SP_), a snowfall correction factor (_SFCF_) counterbalancing errors on snowfall evaluation by the model and evaporated water from snowpack, a refreezing coefficient (_CFR_) of water inside the snowpack in case temperature falls under _TT_, and a water retention coefficient of melted snow and rainfall in the snowpack (_CWH_) [54; 63]. _TT_ should ordinarily be near 0 \({}^{\circ}\)C. _CFMAX_ commonly ranges between 0.0625 and 0.167 mm/h \({}^{\circ}\)C. _CFR_ and _CWH_ were taken equal to their usual values, 0.05 and 0.1, respectively [63]. _SP_ value limits are zero and one. _SFCF_ can correct modeled snowfall by approaching less or greater precipitated snow, as of being a multiplicative factor to the simulated snow. The parameters that concern the soil moisture routine are the maximum water content of the soil box (_FC_) (mm), a threshold value for actual evaporation reaching potential evaporation (_LP_), and a parameter controlling the relative contribution of rain or snowmelt to flow discharge (_BETA_). _FC_ and _BETA_ should be greater than zero, while the _LP_ value limits are zero and one. The parameters regarding the response routine are the maximum percolation rate (_PERC_) (mm/h) from the upper to lower groundwater box, a threshold value for groundwater content (_UZL_) (mm), and the recession coefficients for upper, intermediate, and lower groundwater box, (_K0_), (_K1_) and (_K2_) (1/h) correspondingly. All the recession coefficients take values from zero to less than one. Finally, the parameter that concerns the routing routine is a runoff transformation parameter (_MAXBAS_) (h), specifying the routing time length in a triangular weighting function [54; 63]. _MAXBAS_ should be greater than one modeled time-step, in our case 1 h.