الفهرس 
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Abstract
Under the operationconditions of high flow rate with high sediments concentration, it will be very common to use a combination of more than one type of filters in the same irrigation network for proper irrigation water filtering. The tradition sand separator is unable to separate those particles whose specific gravity close to water, in addition of the screen filters problem that they are prone to clogging. Therefore, a new integral filter was developed, given the name of ”Dual Irrigation Filter”, which has the ability to filter water regardless the particles’ specific gravity and without fear of screen clogging. The new filter is locally manufactured with combination of the sand separator and screen filter. br The performance of the new developed filter was tested and investigated under two cases; with opened apex (to represent its use as floodwater filter) and with closed apex (to represent its use as irrigation filter), and in both cases, the investigation was done in terms of filtration efficiency and outflow rate under different operation parameters. These parameters are:1.Impurities suspension concentration (600, 1500 and 2400 ppm).2.Differential operating pressure (2.5 and 4.0 psi).3.The filtration degree (100, 150 and 200 mesh). br The results show that in case of opened apex, the highest value of the filtration efficiency for the feed suspension of 600, 1500, 2400 ppm was 46.25, 42.13 and 38.73%, respectively, on other hand, under differential operating pressure of 4.0 and 2.5 psi it was 46.25 and 44.47%, respectively, while it was 42.88, 46.10 and 46.25% for the screen filtration degree of 100, 150 and 200 mesh, respectively. Whereas, in case of closed apex, the highest value of the filtration efficiency for the feed suspension of 600, 1500, 2400 ppm was 44.79, 39.85 and 36.01%, respectively, on other hand, under differential operating pressure of 4.0 and 2.5 psi it was 44.79 and 42.58%, respectively, while, it was 41.00, 43.67 and 44.79% for the screen filtration degree of 100, 150 and 200 mesh, respectively.The lowest mean value of the filtration efficiency in case of opened apex for the feed suspension of 600, 1500, 2400 ppm was 39.81, 36.36 and 32.27%, respectively, on other hand, under differential operating pressure of 4.0 and 2.5 psi it was 36.48 and 32.27%, respectively, while, it was 32.27, 33.94 and 36.05% for the screen filtration degree of 100, 150 and 200 mesh, respectively. Whereas, in case of closed apex, the lowest value of the filtration efficiency for the feed suspension of 600, 1500, 2400 ppm was 37.80, 33.50 and 29.20%, respectively, on other hand, under differential operating pressure of 4.0 and 2.5 psi it was 33.30 and 29.20%, respectively, while, it was 29.20, 31.30 and 33.28% for the screen filtration degree of 100, 150 and 200 mesh, respectively.The outflow rate was just statistically correlated to the differential operating pressure. In case of opened apex, the highest mean of the outflow rate for the differential operating pressure of 4.0 and 2.5 psi was 8.678 and 4.977 m3/h, respectively, whereas, in the case of closed apex, it was 9.345and 5.613 m3/h, respectively. Empirical equations, correlate the outflow variation (Q) with differential operating pressure (ΔP) for clean water, were derived.Q 2.0393ΔP+0.9552…. Opened apex with 100 mesh of filtration degree. br Q = 1.9697ΔP+1.0678… opened apex with 150 mesh of filtration degree. br Q = 2.056ΔP+0.9601….. Opened apex with 200 mesh of filtration degree. br Q = 2.1482ΔP+1.0922… closed apex with 100 mesh of filtration degree. br Q = 2.0728ΔP+1.2108… closed apex with 150 mesh of filtration degree. br Q = 2.1629ΔP+1.0956… closed apex with 200 mesh of filtration degree.