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Various end-of-the-line configurations are available for both surface and subsurface drip irrigation systems.


Illustration 1 (top): Various end-of-the-line flushing configurations including flushing submains. Note that adjustable block valves and/or block pressure regulators are preferred instead of single-line regulators since single-line regulators typically cannot be adjusted to facilitate higher pressure flushing. (From p. 95 of “Toro Micro-Irrigation Owner’s Manual.”)


Illustration 2 (right): System design using 0.550-inch ID dripline. The required flushing pressure exceeds the dripline’s maximum operating pressure of 60 psi by 26 psi. If the dripline is flushed at 60 psi, the flushing velocity is inadequate.


Illustration 3 (bottom): System design using 0.620-inch ID dripline. The required flushing pressure does not exceed the dripline’s maximum operating pressure of 60 psi. This is a better choice than 0.520-inch ID.


of 0.620 inches. Both driplines are rated to operate between 10 psi and 60 psi. Note that the first block using 0.520-inch ID dripline has acceptable uniformity and will operate within the dripline’s pressure specifications; however, the product pressure specification is exceeded by 26 psi in order to achieve proper 1 fps flushing velocity. If this design was built, the farmer would never be able to properly flush the system without jeopardizing the integrity of the dripline. On the other hand, the second design using the larger 0.620-inch ID dripline provides excellent uniformity, and it may be flushed at a pressure that does not exceed the manufacturer’s 60 psi pressure rating.


Another common scenario concerns the use of 4 mil – 15 mil drip tapes with pressure ratings ranging from 8 to 15


irrigationtoday.org 21 Flushing vs. EU


Flushing vs. EU


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