Irrigation Plan Reading

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Irrigation Plan Reading
CLT Preparation Workshops

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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

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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.

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Additional Information

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

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Elements of an Irrigation Plan

• Title Block
• Legend
• Drawing
• Details
• Written Specifications

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Reading the Title Block
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Reading the Legend or Key

• The Legend or Key explains what the symbols on
  the drawing represent.

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Reading Plan Symbols
N

• North arrow
• Reading directions
• Direction symbols
• Vicinity map

N
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Typical Irrigation Plan Symbols

• Sprinklers
• Pipe
• Valves
• Controller

• P.O.C.
• Backflow Assembly
• Quick Coupling Valves

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Reading the Drawing

• Heads
• Lateral pipe
• Mainline pipe
• Valves
• Quick Couplers
• Backflow Device
• P.O.C.
• Controller

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Reading Detail Drawings

• The detail drawings illustrate how parts and
  materials are to be installed.

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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.

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A Specification Sheet Example
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Reading Sprinkler Tables
Sprinkler Performance Tables show Arc, pressure
rating, radius, flow and precipitation rate.
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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
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Reading Scale

• Irrigation plans are drawn to scale.
• Scale drawings.
• Converting scale drawings to actual measurements.
• Ruler
• Scales

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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
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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.

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Checking the Scale

• Check which scale is being used for each
  measurement.

Architects Scale
Engineers Scale
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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.

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Using the Architects Scale

• Measure using 1/8 scale.

Measured distance is equal to 15 feet.
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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

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Engineers Scale

• Measure using 130.

Measured distance equal to 65 feet.
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Changing a Landscape Plan to Engineer Scale

• Reducing drawings.

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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.

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Irrigation Plan Reading Exercises
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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!