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Author: Edgar Snowden Publisher: ISBN: Category : Stream measurements Languages : en Pages : 156
Book Description
"The purpose of this study is to investigate the division of flow of water in a flume of rectangular cross-section when the flume is provided with a side weir. An equation has been derived so that the quantity of water flowing over the side weir compared to the quantity of water flowing in the main channel can be predicted. This ratio is acceptable only within the ranges of heads, velocities, and weir lengths imposed by the geometry of the system tested"--Abstract, leaf ii.
Author: Edgar Snowden Publisher: ISBN: Category : Stream measurements Languages : en Pages : 156
Book Description
"The purpose of this study is to investigate the division of flow of water in a flume of rectangular cross-section when the flume is provided with a side weir. An equation has been derived so that the quantity of water flowing over the side weir compared to the quantity of water flowing in the main channel can be predicted. This ratio is acceptable only within the ranges of heads, velocities, and weir lengths imposed by the geometry of the system tested"--Abstract, leaf ii.
Author: D.S. Miller Publisher: CRC Press ISBN: 1351454889 Category : Technology & Engineering Languages : en Pages : 257
Book Description
This manual provides the procedures and data necessary to calculate discharges over and through hydraulic structures. Contents: Introduction; Discharge measurement structures; Discharge relationships and component head losses for hydraulic structures; Headlosses in closed conduit systems flowing full; Analysis of flow conditions and hydraulic design for river diversion in closed conduits; Flow through and over rockfill structures
Author: R. W. P. May Publisher: Thomas Telford ISBN: 9780727731678 Category : Diversion weirs Languages : en Pages : 164
Book Description
Side weirs are widely used to divert or discharge flows from reservoirs, rivers, artificial channels and sewers. The hydraulic behaviour of this type of weir is complex and difficult to predict accurately using simple methods and the diversity of applictions of side weirs has the potential to complicate guidance. This manual covers the fundamental hydraulic principles and discusses the practical design issues separately for each main strcuture type.
Author: Samuel Egnew Tingey Publisher: ISBN: Category : Languages : en Pages : 62
Book Description
Oblique weirs are those weirs placed at an angle with respect to the channel centerline. They can be used in canal applications where more discharge is needed, but there is limited freeboard. The discharge coefficients were determined for 54 different weirs by measuring total head for various flows over each weir. These weirs included sharp, half round and quarter-round-crested weirs. There were 18 weirs for each crest shape with three weir heights for each angle tested. The oblique angles tested were 10°, 15°, 25°, 45°, 60°, and 90° with respect to the channel centerline, with the nominal weir heights being 4, 8, and 12 inches. The half-round-crested weirs were the most efficient, followed by the quarter-round-crested weirs and the sharp-crested weirs were the least efficient. By decreasing the oblique angle, the weir length became longer and the weir would be more efficient than the normal weir.
Author: Kai Ji Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
V-shaped weirs with small angles are efficient in accurately measuring extremely small discharge rates. The concept of slit weirs to measure discharge rates has been studied in recent investigations. Rectangular multi-slit notches or weirs have been shown to extend the range of flow measurement to include both very low and high discharge rates. It is a well-known fact that V-notches whose sections are narrower at lower heads are preferred to rectangular notches to measure small discharge rates in laboratories. To increase the range of discharges measured, the concept of multi-slit weirs using rectangular weirs has been introduced recently. For rectangular multi-slit weirs, experimental data showed that the discharge coefficient C d for multi-slit weirs or a single weir was a function of the Reynolds number R e when R e is based on the width of rectangular weirs. V-notches are generally used for laboratory flow measurements, as they can very precisely measure discharge rates. Hence, the multi-slit weirs formed by V-notches are expected to measure discharges in a very wide range of discharge rates. To represent a common discharge coefficient C d for multi-slit weirs formed of either rectangular or triangular shaped individual weirs, a new Reynolds number R eR is proposed to unify representation of discharge coefficient data for both rectangular shaped and V-shaped multi-slit weir units. C d data for both rectangular and V-shaped multi-slit weirs fall on a single curve and appear to be the function of R eR . At large Reynolds number, R eR, the discharge coefficient C d approaches a constant value of 0.61. This constant also denotes the contraction coefficient for the narrow two-dimensional slit flow. Present test data show that C d for multi-slit V-shaped weirs is generally a function of R eR for b/B
Author: Edgar Snowden
Author: Edgar Snowden
Author: H. J. Tracy
Author: D.S. Miller
Author: Carl Edward Kindsvater
Author: R. W. P. May
Author: Cecil Ruffell Russell
Author: John Shen
Author: D. D. Gonzalez
Author: Samuel Egnew Tingey
Author: Kai Ji