Ph.D In Irrigation Engineering

Nov 16, 2015 - Feb 14, 2020

M.Sc. in Irrigation & Drainage Engineering

Sep 16, 2001 - Apr 18, 2004

B.Sc. in Water Resources Engineering

Sep 17, 1995 - Jun 12, 2001

Effect of Channel Slope on discharge coefficient of Cylindrical Crested Weirs

Dec 6, 2012

Journal Engineering and Technology Journal

publisher University of Technology, Iraq

DOI https://doi.org/10.30684/etj.31.7A15

Issue 7

Volume 31

This research paper investigates the effect of the longitudinal channel slope on the discharge coefficient of cylindrical weirs. The methodology applied is by adopting three different diameters of the cylindrical weir and at three different slopes of the channel. In addition, various five flow rates values were used for each case. The study showed that the discharge coefficient increases when the dimensionless value of (Hw/R) [which represents the ratio of the net hydraulic head in upstream to the radius of cylindrical weir] is high. Furthermore, the discharge coefficient increases as the channel slope increase, for the same (Hw/R) ratio. As a result, the discharge coefficient increases with the increment of cylindrical weir diameter. Finally, an empirical non-dimensional relationship was obtained between the discharge coefficient with a channel slope and dimensionless value (Hw/R) with a good correlation coefficient.

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Pressure effect on wetting pattern in layered soil for subsurface point source

May 17, 2012

Journal Al-Rafidain Engineering Journal

publisher Al-Rafidain Engineering Journal

DOI 10.33899

Issue 2

Volume 21

Laboratory experiments were carried out to investigate the effect of operating pressure on wetting pattern in layered soil for subsurface point water source. This study helps to determine a suitable operating pressure and appropriate spacing between emitters and drip lateral pipes . The layered soil profiles were prepared using two types of soil (clay and loam) in two combinations (clay over loam and loam over clay) . Three operation pressures (4.99, 9.99 and 16.14, m) with a nominal dripper discharge rate (2 l/hr) were used . The experimental results showed that positive back pressure around dripper outlet develops, when the water application rate is larger than the soil infiltration capacity , and the actual dripper discharges were less than the rated dripper discharges by about (10%-28%) due to back pressure effect . Furthermore, it has been observed that water start rising up to the soil surface (Chimney Effect) when the operating pressure is (16.14m) for the loam over clay soil profile, which occurs when water application rate exceeds the soil capability to spread the water. It is found that the total wetted area for both layers was not affected by the operation pressure for the same volume of applied water . In the relationship of the wetting advance (a tb) , it is found that , the constant (b) is not effected by operation pressure while the constant (a) increased with increased operation pressure .

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