- - AGRICULTURE CORE CURRICULUM - -

(CLF6000) Advanced Core Cluster: ORNAMENTAL HORTICULTURE

 (CLF6100) Unit Title: IRRIGATION AND DRAINAGE

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 (CLF6499) Topic: IRRIGATION AND DRAINAGE     Time         Year(s) 
                    UNIT EXAM                   1 hour        3 / 4 
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TOPIC PRESENTATION: IRRIGATION AND DRAINAGE UNIT EXAM


NAME _____________________________________

DATE ________________

PER. ________________


          Irrigation and Drainage in the Landscape: Unit Exam


COMPLETION: Complete the phrases below with the appropriate word or words.

1. Two items to check when evaluating the water source for irrigation are

   _________________________________ and _____________________________.

2. The main physical property of soil which affects its ability to drain

   well is _______________________________________.

3. _____________________________________ is usually poured around drainage
   tile or pipe to prevent entrance of soil particles into the drain, and
   to facilitate the movement of water into the pipe.

4. _____________________________________ are used as part of sprinkler
   irrigation systems to flood planter boxes and other plantings in
   retained areas.

5. With regard to water supply, sprinkler systems operate at relatively

   high __________________________ and high ___________________________
   compared to drip irrigation systems.

6. PVC degrades and becomes brittle when exposedto________________________.
   Therefore, most of its applications are underground.

7. Schedule ____________ pipe is used for "main" lines and for most
   standard fittings.

8. As elevation changes in the irrigation system, there is a corresponding

   change in ________________________________.

9. Be sure to _________________________________ BEFORE filling the trenches
   back in.

10. If a wet spot develops around the lowest elevation head on a sprinkler

    circuit, the usual cause is ______________________________.

11. Pressure of about _____________ psi is adequate for most drip
    equipment.

12. Instead of stiff PVC, drip systems rely on flexible, black tubing

    made of ___________________________________.

13. Dipping the ends of drip tubing in _____________________________

    makes them softer and easier to fit.

14. ____________________________________ is the total water loss by
    evaporation rom the soil surface and transpiration from plants, from
    a given area, and during a specified amount of time.

15. ____________________________________ reduce surface tension of soil
    particles to improve water penetration and reduce runoff.


SHORT ANSWER/ESSAY: Answer the following questions as concisely as possible in the 
space provided.

16. a. Define irrigation.










    b. Define drainage.






17. Describe four site factors which should be analyzed before designing an
    irrigation system.














18. Tell how poor drainage can adversely affect:

    a. Plants:




    b. Buildings or other structures:





19. Describe three advantages and three disadvantages to sprinkler systems,
    in comparison with other methods of irrigation.

    Advantages:













    Disadvantages:







20. Describe three factors which affect water penetration and infiltration
    rates.










21. Explain three features of modern irrigation controllers which help us
    in irrigating the landscape efficiently.










22. Describe three types of sprinkler heads and the main uses of each.











23. Identify two items which should be checked on a routine basis in the
    maintenance of irrigation systems.








24. List four advantages of using a drip irrigation system.














25. Explain three different ways you might increase the total precipitation 
    of an area being irrigated with a drip system.










26. Give the function of each of the following:

    a. Transfer barbs:


    b. Spaghetti tube:


    c. Goof plugs:



27. Explain a situation in which pressure-compensating drip emitters might
    be necessary in a system.





28. Describe four irrigation practices which can help conserve water in the
    landscape.
















29. Describe how a plant might look if it is ready to be irrigated.





30. Describe the feel of a medium to fine textured soil which is probably
    ready for an irrigation.
























12/19/90 MH/sg

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