leads to
c =
h1u1 h2u2
h1 h2
: (3.2)
Using the Manning equation for discharge per unit width, q,
q =
1
n0
hR2=3H S
1=2
0 ; (3.3)
where n0 is the Manning coefficient, h is the flow depth, RH is the hydraulic radius
and S0 is mean channel slope; the relationships: u h2=3, q
h5=3 and u q2=5 can
18
be derived for a wide rectangular channel for which RH h and u = q=h. Now using
u1h1 = q1, u2h2
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