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Irrigation Plan Reading

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Make a material list from ... a 1'= 8' scale. 3/16 = 0.1875. 9/5/09. CLT Irrigation Plan Reading ... Changing a Landscape Plan to Engineer Scale. Reducing ... – PowerPoint PPT presentation

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Title: Irrigation Plan Reading


1
Irrigation Plan Reading
CLT Preparation Workshops

2
Acknowledgements
  • Clackamas Community College in partnership with
    Oregon Landscape Contractors Association
  • Certified Landscape Technician 2002-2003 State
    of Oregon Grant Project
  • The State of Oregon administering the Department
    of Labor Workforce Investment Act Funds by acting
    through its Department of Community Colleges and
    Workforce Investment Council of Clackamas County
  • Dave Snell, Walla Walla Sprinkler Company

3
Learning Objectives
  • Upon completion of this class, you will be able
    to
  • Identify common elements of irrigation plans.
  • Use engineer and architect scales.
  • Make a material list from the plan (take-off).
  • Calculate the water volume of irrigation zones in
    the design.
  • Calculate precipitation rates.

4
Additional Information
  • ALCA CLT Irrigation Study Manual
  • OLCA/CCC Math Skills Workshop
  • CCC Irrigation Design Course

5
Elements of an Irrigation Plan
  • Title Block
  • Legend
  • Drawing
  • Details
  • Written Specifications

6
Reading the Title Block
7
Reading the Legend or Key
  • The Legend or Key explains what the symbols on
    the drawing represent.

8
Reading Plan Symbols
N
  • North arrow
  • Reading directions
  • Direction symbols
  • Vicinity map

N
9
Typical Irrigation Plan Symbols
  • Sprinklers
  • Pipe
  • Valves
  • Controller
  • P.O.C.
  • Backflow Assembly
  • Quick Coupling Valves

10
Reading the Drawing
  • Heads
  • Lateral pipe
  • Mainline pipe
  • Valves
  • Quick Couplers
  • Backflow Device
  • P.O.C.
  • Controller

11
Reading Detail Drawings
  • The detail drawings illustrate how parts and
    materials are to be installed.

12
Written Specifications
  • The specifications
  • are the written instructions for installing the
    irrigation system.
  • indicate the type and brand of material that is
    to be installed.

13
A Specification Sheet Example
14
Reading Sprinkler Tables
Sprinkler Performance Tables show Arc, pressure
rating, radius, flow and precipitation rate.
15
Calculating Precipitation Rate
Precipitation Rate 96.3 x the total gpm in a
given area in inches/hour square feet of
the area being covered
16
Reading Scale
  • Irrigation plans are drawn to scale.
  • Scale drawings.
  • Converting scale drawings to actual measurements.
  • Ruler
  • Scales

17
Converting Measurements
  • To convert a ruler measurement from a scale
    drawing to the actual distance
  • 1. Measure the scale distance.
  • 2. Convert fractions to decimal by dividing.
  • 3. Multiply by the scale used.

3 3/16 inches using a 1 8 scale
3/16 0.1875
3.1875 x 8 25.5 feet
18
Architects Engineers Scales
  • Triangle shaped rulers about 1 foot long.
  • Measure between two points as with a common
    ruler.
  • Directly read the actual distance from the scale.
  • No need to calculate to convert inch measurements
    into actual measurements.

19
Checking the Scale
  • Check which scale is being used for each
    measurement.

Architects Scale
Engineers Scale
20
Using the Architect's Scale
  • More often used in landscape designs.
  • Converts measurements to feet and inches.
  • Scale ranges for 1/161 to 31.
  • Small marks beyond the 0 point are inch marks.

21
Using the Architects Scale
  • Measure using 1/8 scale.

Measured distance is equal to 15 feet.
22
Using the Engineers Scale
  • Often used for irrigation and commercial
    landscapes
  • Converts measurements to feet and 1/10 of feet
  • Scale ranges from 1600 to 11

23
Engineers Scale
  • Measure using 130.

Measured distance equal to 65 feet.
24
Changing a Landscape Plan to Engineer Scale
  • Reducing drawings.

25
Practice
  • 1. Measure the lengths of the pipes in your
    handout.
  • 2. Record the actual lengths according to the
    listed scale.
  • 3. Measure the turf areas on the handout.
  • 4. Record the dimensions and calculate the
    square footage.

26
Irrigation Plan Reading Exercises
27
What have you learned today?
  • Before you leave today
  • Complete the post-class test to help us determine
    how effective this class has been.
  • Fill out the evaluation form.
  • Thank you and good luck on the CLT test!
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