Sr. No.

Symbol

Variables/Properties

Calculation

Unit

1

D

Event duration

$D=T_{\text{end}}-T_{\text{begin}}+15\left[\min \right]$

min

2

$D_i$

Intra-event dry periods

$D_i={\displaystyle \sum _{t=T_{\text{begin}}}^{t=T_{\text{end}}}{R}_d}$ with $I_d=\{\begin{array}{l}15,\text{if}{I}_d=0\left[\text{mm}\right]\\ 0\text{else}\end{array}$

min

3

$D_p$

Total Depth

$D_p={\displaystyle \sum _{d=T_{\text{begin}}}^{d=T_{\text{end}}}{R}_d}$

mm

4

$R_m$

Mean event rain rate

$R_m=\frac{1}{D}{\displaystyle \sum _{t=T_{\text{begin}}}^{t=T_{\text{end}}}{R}_t}$

mmh⁻¹

5

$R_{\max }$

Maximum rain rate

$R_{\max }=\max \left(R_t\right)$

mmh⁻¹

6

IET

Previous inter-event time

$\begin{array}{l}IET=T_{\text{begin}}\left(\text{currentevent}\right)\\ -T_{\text{end}}\left(\text{Previousevent}+15\right)\end{array}$

min

7

$T_{mx}$

Time to peak

$T_{mx}=\frac{t^{mx}}{D}$

min

8

$D^{mx}$

The fraction of event depth until event maximum

$D^{mx}=\frac{{\displaystyle {\sum }_{d=T_{begin}}^{d^{mx}}{D}_d}}{D_p}$

9

$D_{d\%}$

The fraction of intra event rainless periods

$D_{d\%}=\frac{D_i}{D}$

%