The criteria for assessing the uniformity of water application in the system were the coefficient of variation (CV) of the lateral line emitter, the distribution uniformity coefficient
(DUC), and Christiansen's uniformity coefficient
Usually in engineering, uniformity coefficient
Cy and curvature coefficient CC are used as characteristic parameters for evaluating the grain composition of granular materials.
The microscopic parameters include the region number, total region area, average length, pore porosity, uniformity coefficient
, curvature coefficient, sorting coefficient, fractal dimension, weighted probability entropy, maximum region area, and average region area.
Distribution uniformity was expressed through the statistical uniformity coefficient
(SUC) and distribution uniformity of the lowest quartile (DU).
It is shown by the values of uniformity coefficient
(Cu of 2.32) and curvature coefficient (Cc of 0.81), which do not meet the well graded criteria, (Cu [greater than or equal to] 6 and 1.5 [less than or equal to] Cc [less than or equal to] 3).
Tenders invited for Filter sand ( in hdpe bags) as per is-8417 (part 1)-1977 reaffirmed 2001 and as given below : effective size 0.45-0.70mm uniformity coefficient
Likewise, the results obtained are in line with those obtained by El-Badawi (2001) who found the uniformity coefficient
of 85% at central Sudan.
The water distribution uniformity coefficients
used in this study were the Christiansen uniformity coefficient
(CU, in %), proposed by CHRISTIANSEN (1942), Equation 1, and the distribution uniformity coefficient
(DU, in %), proposed by CRIDDLE et al.
The parameters evaluated were the volumetric median diameter (Dv0.5), the uniformity coefficient
of sprayed droplets (Coef.
The suitability of sand from the above mentioned sources was evaluated on the basis of effective size and uniformity coefficient
. These two parameters were calculated from the results of sand sieve analysis.
The measured discharge was used to calculate the uniformity coefficient
and distribution uniformity using the equations given by ASAE [28, 29, 30, 13].
CU : distribution uniformity coefficient
developed by Christiansen (%).