QUICK REVIEW QUESTIONS
(ON EVERYTHING COVERED SO FAR)
When designing a drip irrigation system what is the minimum percentage of the subsurface plant area that should be wetted?
(a) 50% (b) 60% (c) .80% for trees (d) 70%
An easy way to avoid high flow loss in your drip tubing is to keep the length of your 12mm lateral tubing limited to ------------feet.
Compared to the generally low flow losses in the drip laterals, much greater pressure differences can be caused by -----------------------changes along the tubing.
To design your drip irrigation system for the greatest potential demands of the project, you should use the highest number on the P.E.T. scale for your area's climate. This top figure is known as the ___________________________number.
Another way to make sure your system meets the future needs of the project is to design your system to supply the plant material when it's fully__________________.
The plant area for a tree with a six-foot diameter across its drip line circle is __________square feet.
Biloxi, Mississippi has a mid-summer daily evapotranspiration rate of ______________ inches.
Biloxi is on the gulf coast of southern Mississippi. In which two climatic ranges in Table "A" does its E.T. number fall?__________climate and ______________ climate.
Which of the two climate types above more aptly describes the gulf coast area?
_________________climate.
What is the worst case P.E.T. for that climate?______________________inches per day.
A mature tree has a plant factor of __________________.
What's the plant factor for a mature lemon tree?
What's the gallons per plant per day requirement for a 30 foot diameter tree in a cool dry climate?
The Factors
Tree =
Plant area = square feet
Climate factor, worst case Drip efficiency = (moderate)
The Formula
.623 x ------- x --------- x ------- =
__________________
ANSWERS TO REVIEW QUESTIONS
1. 50%
2. 300
3 . Elevation
4. Worst Case
5. Mature
6. 28.27
7. 0.19
8. Cool Dry, Warm Humid
9. Warm Humid
10.0.20
11.0.80
12.0.60
13. The Factors
Tree - 0.80
Plant area - 706.86
Climate factor worst case =0.20
Drip Efficiency = 0.90 (moderate)
The Formula:
.623 x 706.86 x .80 x .20 = 78 gallons per day (78.28)
.90
