The objectives of the work were to study the effect of drip irrigation circuits (DIC) and lateral lines lengths (LLL) on: Flow velocity (FV) and velocity head (VH). Laboratory tests were con- ducted at Irrigation Devices and Equipments Tests Laboratory, Agricultural Engineering Research Institute, Agriculture Research Center, Giza, Egypt. The experimental design of laboratory experiments was split in randomized complete block design with three replicates. Laboratory tests carried out on three irrigation lateral lines 40, 60, 80 m (LLL1, LLL2; LLL3) under the following three drip irrigation circuits (DIC): a) one manifold for lateral lines or closed circuits with one manifold of drip irrigation system (CM1DIS); b) closed circuits with two manifolds for lateral lines (CM2DIS), and c) traditional drip irrigation system (TDIS) as a control. Concerning FV values, DIC and LLL treatments could state in the following ascending orders: TDIS u3c CM1DIS u3c CM2DIS and LLL1 u3c LLL2 u3c LLL3, respectively. FV varied from 0.593 m·sec–1 to 1.376 m·sec–1. i.e. FV u3c 5 ft·sec–1 and this is necessary to avoid the effect of water hammer in the main and sub-main lines, but in lateral line, it can cause silt and clay precipitation problems. The differences in FV among DIC and LLL were significant at the 1% level. The effect of interaction: DIC X LLL on FV values, were significant at the 1% level. The maximum and minimum values of FV were noticed in these interactions: CM2DIS X LLL3 and TDIS X LLL1, respectively. The following ascending orders TDIS u3c CM1DIS u3c CM2DIS and LLL1 u3c LLL2 u3c LLL3 expressed their effects on VH respectively. Differences in VH among DIC and/or LLL were significant at the 1% with few exceptions. The effects of interactions: DIC X LLL on VH were significant at the 1% level in some cases. The maximum and minimum values of VH were found in the interactions: CM2DIS X LLL3 and TDIS X LLL1, respectively.
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机译：这项工作的目的是研究滴灌回路（DIC）和侧线长度（LLL）对以下各项的影响：流速（FV）和流速头（VH）。实验室测试是在埃及吉萨农业研究中心农业工程研究所的灌溉设备和设备测试实验室进行的。将实验室实验的实验设计分为三个重复的随机完整模块设计。在以下三个滴灌回路（DIC）的三个灌水支线40、60、80 m（LLL1，LLL2; LLL3）上进行了实验室测试：a）一支用于滴灌系统的支线或闭路的支管（CM1DIS）; b）带有两个用于侧管的歧管的闭合回路（CM2DIS），以及c）传统的滴灌系统（TDIS）作为控制。关于FV值，DIC和LLL处理可以按以下升序排列：TDIS u3c CM1DIS u3c CM2DIS和LLL1 u3c LLL2 u3c LLL3。 FV从0.593 m·sec-1到1.376 m·sec-1。即FV u3c 5 ft·sec-1，这对于避免在主干线和副干线上产生水锤效应是必要的，但是在横向管线中，这可能会导致淤泥和粘土沉淀问题。 DIC和LLL之间的FV差异在1％的水平上显着。相互作用的影响：DIC X LLL对FV值的影响在1％的水平上显着。在以下相互作用中，FV的最大值和最小值分别为：CM2DIS X LLL3和TDIS X LLL1。以下升序TDIS u3c CM1DIS u3c CM2DIS和LLL1 u3c LLL2 u3c LLL3分别表示了它们对VH的影响。 DIC和/或LLL之间的VH差异为1％，但仅有少数例外。相互作用的影响：DIC X LLL对VH的影响在某些情况下为1％。在相互作用中分别找到了VH的最大值和最小值：CM2DIS X LLL3和TDIS X LLL1。
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