Design of Gutters
Gutter Flow calculations are necessary to establish the spread of water on the shoulder, parking lane, or pavement section. Streets with uniform cross slopes like that shown in Figure 5.4 are found in urban areas. Since the gutter flow is assumed to be uniform for design purposes, Manning’s equation is appropriate with a slight modification to account for the effects of a small hydraulic depth (A/T). However, for main roads and highways minimum gutter width should not be less than 0. 6 m.
For a triangular cross-section as shown in Figure 5.5, Manning’s equation for gutter
flow is written as:
𝐐 = (1/n) 𝐊c 𝐒𝐱𝟓⁄𝟑𝐒𝐋𝟏⁄𝟐𝐓 𝟖⁄𝟑
Where,
Kc : Empirical constant equal to 0.376
n : Manning’s roughness coefficient for gutter flow as given in Table
Q : Flow rate (m3/s)
T : Width of flow (spread), m
Sx : Cross slope, m/m
SL : Longitudinal slope, m/m
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Urban Infrastructure and Network Study notes for M. plan Sem-III
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