Effect of Hydraulic Head and Slope on Water Distribution Uniformity of the IDE Drip Irrigation Syste - PowerPoint PPT Presentation

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Effect of Hydraulic Head and Slope on Water Distribution Uniformity of the IDE Drip Irrigation Syste

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Title: Effect of Hydraulic Head and Slope on Water Distribution Uniformity of the IDE Drip Irrigation Syste


1
Effect of Hydraulic Head and Slope on Water
Distribution Uniformity of the IDE Drip
Irrigation System
Victor B. Ella1, Manuel R. Reyes2, and Robert
Yoder3
University of the Philippines Los Baños1, North
Carolina AT State University2, and International
Development Enterprise3
OBJECTIVE This study was carried out to evaluate
the effect of slope and hydraulic head on the
water distribution uniformity of a low-cost drip
irrigation system developed by the International
Development Enterprises (IDE).
METHODOLOGY The IDE drip system was tested for
water distribution uniformity under varying
system heads and slope conditions. The
experiments were conducted at the laboratory
facilities of the College of Engineering and
Agro-industrial Technology, University of the
Philippines Los Baños. A drum reservoir served as
water supply for the IDE drip system. A sub-main
of 10 m and lateral-sub holder of 20 m with
adjustable slope was fabricated to enable slope
variations during laboratory experiments. The
drip system was operated at pre-specified
operating heads of 1 m, 1.5 m, 2 m and 2.5 m from
the reservoir outlet for slopes of 0, 10, 20,
30, 40 and 50 for the sub-main and 0 slope
for the laterals. The discharge in each emitter
was monitored under each chosen slope through
direct volumetric measurements. The uniformity
coefficient was then estimated using the
Christiansens method for each of the chosen
slopes.
Where CU Christiansens Uniformity
Coefficient () D Average absolute deviation
from the mean M Mean application Xi
Individual application amount n number of
individual application amount Experimental
Design 3 replications X slopes
0,10,20,30,40 and 50 Y hydraulic heads 1m,
2m and 3m Total runs 3XY 54
CONCLUSION In general, the higher the slope of
the submain of the IDE drip irrigation system,
the poorer is the distribution uniformity
regardless of the operating head. Results of the
laboratory experiments could serve as basis for
proper water management and for maximizing
distribution uniformity of the drip system for a
given slope and topography under field conditions
  • RESULTS
  • Laboratory experiments showed that an operating
    head of 3.0 m generally provided better emission
    discharge uniformity than lower heads at various
    slopes of the submain
  • Results of laboratory drip experiments showed no
    significant difference in emission uniformity
    between heads differing by only 0.5 m.

This project is funded by USAID through Virginia
Tech and North Carolina Agricultural and
Technical State University
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