Technical Note: Calibrating Agridrain Water Level Control Structures Using Generalized Weir and Orifice Equations

2008 ◽  
Vol 24 (5) ◽  
pp. 595-602 ◽  
Author(s):  
J. A. Chun ◽  
R. A. Cooke
Keyword(s):  
Water Level ◽  
Technical Note ◽  
Level Control ◽  
Control Structures

scholarly journals Calibration of Stainless Steel-edged V-Notch Weir Stop Logs for Water Level Control Structures

2019 ◽  
Vol 35 (5) ◽  
pp. 745-749
Author(s):  
L. E. Christianson ◽  
R. D. Christianson ◽  
A. E. Lipka ◽  
S. Bailey ◽  
J. Chandrasoma ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Water Level ◽  
Flow Rate ◽  
Subsurface Drainage ◽  
Conservation Practices ◽  
Nutrient Loads ◽  
Level Control ◽  
Control Structures ◽  
Flow Monitoring ◽  
Flow Through

Abstract. Dependable flow rate measurements are necessary to calculate flow volumes and resulting nutrient loads from subsurface drainage systems and associated conservation practices. The objectives of this study were (1) to develop appropriate weir equations for a new stainless steel-edged 45° V-notch weir developed for AgriDrain inline water level control structures and (2) to determine if the equation was independent of flow depth in the structure. Weirs for 15 cm (6 in.) and 25 cm (10 in.) inline water level control structures were placed at three heights in each structure: at the base, 48 cm from the base, or 97 cm from the base, and the height of the nappe above the weir crest was recorded over a range of flow rates. The resulting data were fitted to equations of the form Q = aHb where Q is the flow rate, H is the height of the nappe above the weir crest, and a and b are fitted parameters. There were no significant differences in the fitted parameters across the two structure sizes or across the three weir placements. The fitted equation for these new stainless steel-edged V-notch weirs was Q = 0.011H2.28 with Q in liters per second and H in centimeters, and Q = 1.44H2.28, with Q in gallons per minute and H in inches. These equations can be used for measuring flow through AgriDrain in-line structures, although in-house weir calibration is highly recommended for specific applications, when possible. Keywords: Drainage, Flow monitoring, Subsurface drainage, V-notch weir, Weir calibration.

scholarly journals Use of bottom slots and submerged vanes for controlling sediment upstream of duckbill weirs

2020 ◽  
Vol 20 (8) ◽  
pp. 3393-3403
Author(s):  
Mahla Tajari ◽  
Amir Ahmad Dehghani ◽  
Mehdi Meftah Halaghi ◽  
Hazi Azamathulla
Keyword(s):  
Image Processing ◽  
Water Level ◽  
Maximum Relative Error ◽  
Level Control ◽  
Control Structures ◽  
Flow Capacity ◽  
Irrigation Networks ◽  
Weir Height ◽  
Submerged Vanes ◽  
3D Software

Abstract Duckbill weir is one of the water level control structures in irrigation networks, which is of interest to many engineers. Sediments transported in irrigation networks that accumulate upstream of duckbill weirs cause problems in operation, and affect the upstream water level. In this paper, submerged vanes and bottom slots are investigated for flushing the sediment downstream of the said weir. The experiments were conducted in a rectangular flume, 12 m long, and 0.6 m wide. The vanes placed in four sections were perpendicular to the sidewall. Flow-3D software was used for simulation of flow and sedimentation patterns. The results showed that submerged vanes create a secondary flow which is very useful for flushing the sediment, especially in the value of (H is head over the sidewall and P is the weir height). Further, the results showed duckbill weir efficiency (which is defined as the ratio of sediment trap to flow capacity of the weir) is as high as 47% (for values of H/P = 0.1–0.5 and total models). Finally, image processing results showed a maximum relative error of 14.4% for the simulation of the sediment pattern with Flow-3D software.

Water Level Control of Small-scale Hydroelectric Power Plant

2002 ◽  
Vol 122 (6) ◽  
pp. 989-994
Author(s):  
Shinichiro Endo ◽  
Masami Konishi ◽  
Hirosuke Imabayashi ◽  
Hayami Sugiyama
Keyword(s):  
Power Plant ◽  
Water Level ◽  
Hydroelectric Power Plant ◽  
Small Scale ◽  
Hydroelectric Power ◽  
Level Control

Model Predictive Control for Water Level Control in the Case of Spills

2017 ◽  
Vol 143 (3) ◽  
Author(s):  
Xin Tian ◽  
Boran Ekin Aydin ◽  
Rudy R. Negenborn ◽  
Nick van de Giesen ◽  
José María Maestre
Keyword(s):  
Model Predictive Control ◽  
Water Level ◽  
Predictive Control ◽  
Level Control

scholarly journals STEAM GENERATOR WATER LEVEL CONTROL

1964 ◽  
Author(s):  
A. N. Nahavandi ◽  
A. Batenburg
Keyword(s):  
Water Level ◽  
Steam Generator ◽  
Level Control
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