River

Catchment area S, km2

Length of the main river L, km

Average slope of the river I

Concentration time tc

Reference

m/m

%

Calculated by (11)

Hour or (Hour: min)

Observed

(Hour: min)

RDAT

569

50

0.032

3.2

6.7 (6 h 42 min)

5 h 30 min

[2]

RHERAYA

225

32

0.072

7.2

4.8 (4 h 48 min)

4 h 30 min

N’FIS

1270

82

0.025

2.5

8.7 (8 h 42 min)

8 h 30 min

OURIKA

503

45.5

0.069

6.9

5.9 (5 h 54 min)

5 h 00 min

ZAT

528

55

0.048

4.8

6.4 (6 h 24 min)

6 h 00 min