City of Frisco Engineering Standards

Engineering Standards
Table 4.5 Velocity Head Loss in Closed Conduits
Schematic
Inlet
Kj
1.25
Manhole at Change in Pipe Direction
Schematic Angle Kj
90° 0.55
60° 0.48
45° 0.42
30° 0.30
0° 0.05
Bend in Pipe
Schematic Angle Kj
45° 0.35
30° 0.20
Manhole
Schematic Angle Kj
0° 1.00
22 1/2° 0.75
45° 0.50
60° 0.35
90° 0.25
.
Section 4 – Drainage Design Requirements May 2012 Page 4-21