Subsurface, drip – Micro Irrigation
Subsurface, drip or micro-irrigation are all typically found
among the recommendations for water wise landscapes. The principal advantage
of these systems is that water is not lost to evaporation as with overhead
irrigation systems. However, a number of concerns should be addressed in
proper design and installation of these types of systems. In clay soils,
infiltration rates may be too slow for adequate spread of the water, and
thus wet spots may develop around the emitter, or irrigation heads, while
dry spots develop if spacing is too far apart. Similarly, subsurface irrigation
will work if properly spaced for the type of plants and soil, but leave dry
spots otherwise. As noted below, if using graywater, local ordinance may
require the use of subsurface irrigation systems.10
Care should be taken when drip emitters are installed taking
into consideration the anticipated growth of landscape plantings, proper
filtration to prevent clogging, and regular maintenance to ensure proper
operation. Subsurface irrigation requires similar attention to soil type
and additional attention to proper depth of the system. Micro irrigation
requires pressure reduction valves to operate properly and not damage the
irrigation heads. Programmatic
materials should point out these considerations when encouraging customers
to use drip, micro- or subsurface irrigation.
|
|
DRIP IRRIGATION...
used with mulching is very water efficient.
Click to enlarge in separate window. |
Efficient Irrigation
Irrigation Zoning
Alternate Sources |