List of top Irrigation and Drainage Engineering Questions on Border Irrigation and Distribution Uniformity

Uniformity of irrigation is checked in a border strip by measuring the water penetration depth at 16 equally spaced stations along the strip. The depths of penetration of water recorded (in mm) are as follows:

0.65	0.83	0.79	0.87
0.67	0.85	0.86	0.68
0.88	0.77	0.73	0.59
0.89	0.63	0.72	0.70

The distribution uniformity low-quarter (DULQ), in fraction, is ________.