CHAPTER 7 - WEIRS - Bureau of Reclamation
A broad-crested weir is a raised overflow crest, commonly a flat horizontal block. However, a variety of crest shapes can be used to establish flow control in boundaries that are horizontal in the direction of flow.
weir is a barrier in an open channel, over which water flows. A weir with a sharp upstream corner or edge such that the water springs clear of the crest is a "sharp crested weir". All other weirs are classified as "weirs not sharp crested". Weirs are to be evaluated using the following equation: .
Uncontrolled Overflow Weirs - United States Army
The uncontrolled overflow weir can be specified as either a broad crested, ogee shaped, or sharp crested. The selection of a weir shape does not limit the modeling of other weir shapes. The...
Lateral Structure Data Command - CivilGEO Knowledge Base
After creating lateral structures, the user can use the Lateral Structure Data command to define the lateral structure data, connection data, overflow weir, culverts, gate openings, rating curves, and more. This article describes how to use the Lateral Structure Data command in …
3. Weir Nomenclature and Classification - Bureau of Reclamation
Weirs are commonly named by the shape of their blade overflow opening shape (figure 7-1) for sharp-crested weirs or the flow control section shape for broad-crested weirs. Thus, weirs are partially classified as rectangular, trapezoidal, triangular, etc.
7.2. OVERFLOW SPILLWAYS The crest section for an uncontrolled ogee spillway is commonly shaped to conform to the underside of water flow over a weir. This will produce a pressure distribution on the crest that is close to atmospheric pressure for the selected flow rate. The head above the spillway crest is the design head HD. Fig.
Submerged Weir Flow - United States Army
Submergence corrections are based on the shape of the spillway crest (broad crested, ogee shaped weir, or sharp crested). If the spillway is a broad crested shape, then the same...
Modeling Gated Spillways, Weirs and Drop Structures
HEC-RAS has the ability to model radial gates (often called tainter gates), vertical lift gates (sluice gates), or overflow gates. The spillway crest of the gates can be modeled as either an...
(PDF) Design of weirs and spillways - Academia.edu
To estimate the outflow over a rectangular sharp-crested side weir, the discharge coefficient in the weir equation needs to be known. Although this type of structure has been designed and used extensively by hydraulic engineers, a universally acceptable discharge coefficient does not exist.
Broad-crested weir overflow | IAHR Media Library
A broad-crested weir is a structure with a flat long crest. When the crest is 'broad' enough for the flow streamlines to be parallel to the crest, the pressure distribution above the crest is hydrostatic and the critical flow depth is observed on the weir crest (Chanson 2004).
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