Page 115 - Water and wastewater engineering

3-12 WATER AND WASTEWATER ENGINEERING

Peripheral bar
screens

River

Normal submergence Bar screen cover
approximately 7.6 m
Bar screen

River bottom

Tunnel conduit to
wet well

FIGURE 3-7
River intake.

Hazen-Williams equation is the one most commonly used to describe the flow of water in pipes.
In terms of flow rate, it is given as
.
.
.
S
Q 0 278 CD 263 0 54 (3-2)
3
where Q flow rate, m /s

C Hazen-Williams coefficient of roughness
D diameter of pipe, m
S slope of energy grade line, m/m
Williams and Hazen (1905) investigated a number of different types of pipe to determine C. A
table of updated values is given in Appendix C.