Weirs

From LID SWM Planning and Design Guide
Revision as of 17:16, 3 July 2019 by Jenny Hill (talk | contribs) (→‎More flow related pages)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigation Jump to search

The most common form of weir in LID practices is a rectangular weir, in the form of a check dam or flow control in a swale or other open channel.

The flow (Q), may be calculated by measuring the height of water on the sill of the weir:

Where:

  • Cd = discharge coefficient (default 0.62 for a 'sharp edge).
  • L = Length of the weir (m)
  • g = Acceleration due to gravity (9.81 m/s2)
  • H = Height of water over the weir (m)

More flow related pages[edit]