Flood Analysis with HEC-RAS: A Case Study of Tigris River

Table 2

Roughness coefficient calculation in different parts of the Tigris River.

Manning roughness coefficient	0 + 000.00∼6 + 000.00 km (between historical bridge and University Bridge)	6 + 000.00∼10 + 200.00 km (between University Bridge and Sadi Bridge)
n0	0.028	0.028
n1	0.005	0.020
n2	0.000	0.005
n3	0.000	0.000
n4	0.040	0.045
m	1.150	1.150
n = m(n0+n1+n2+n3+n4)	0.08395	0.1127