Border irrigation evaluation using power advance approach of the volume balance model / Rosemia S. Macarthur

Thesis (Master of Science in Agricultural Engineering) -- Central Luzon State University, June 2018.

This study was conducted to evaluate the border irrigation method using power
advance approach of the volume balance model. Specifically, it aimed to develop a
computer program that computes the application efficiency, field losses and recommended stream size.

Infiltration depth function and net depth of water applied established before
irrigation using equation z = kt. Different infiltration depths functions were established
using the formula, z = kt" a + ct. Net depth of water to be applied was also determine
using the formula dn = (FC-CSM )As D. Iteration was done to determine the correct
value of the subsurface shape factor, o, and slope of infiltration equation, r. The values
of co, and r, aided in the prediction of advance distance, L along the border using the
Equation Lqot/oyw+ cwk(t" + cwt/(r+l). The pump used during field experiment
was two-inch gasoline self-priming pump.

The derived equations from the field experiment were use in the development of
computer program and written in Visual studio 2015, named Border Irrigation Support
System (BISS).

The result of the study showed that, the net depth of water to be applied was 5.68
cm, and the infiltration depth equations are z = 0.0087800
802
4 0.00213t, z

0.0087g0
50802
4 0.00360t and z= 0.00878/9
50802
4 0.00457t Equations to find the value of L, were established; L=0.06953t4/(0.16529 + 0.00703,0"0
02
4 0.00150tu.) for 0.17 m'/min pump discharge, L= 0.115794/(0.22446 + 0.006944,""
0
00 4 0.00248tu.)
for 0.34 m'/min pump discharge and L = 0.15422t4 / (0.26657 + 0.00680£,"
0
0
2
for 0.80 m'/min pump discharge. The predicted advance distances were
close to the observed advance distances with 0.03m to one-meter discrepancy. The result
shows that, 0.80 m'/min pump discharge gives the highest application efficiency of
50.93% and 0.17 m'/min pump discharge give the highest deep percolation ratio and tail
water r:atio with r.98% aqd ~.J6% respectively. In addition, 0.80 m'/min pump
discharge give a high R value of 99.8%. BISS manual develop for easy operation and
utilization of the computer program.