water level, ∆h, can be obtained by the energy equation between sections 1
and 2 (Kindsvater, Carter and Tracy, 1953) as
∆hKBV^22 /2gS 0 L/ 1 V^21 /2g (10.8)whereKBis the bridge loss coefficient (Table 10.2), expressed as a function
of the conveyance ratio,
kb/kB, (10.9)CULVERTS, BRIDGES AND DIPS 435
Fig. 10.10 Flow profile through bridge with contracted channel of rela-
tively short length (subcritical flow)
Table 10.2 Bridge loss coefficient, KB
KB
1.0 1.00
0.8 1.36
0.6 1.67
0.4 1.88
0.2 1.92