Guide to Estimating Irrigation Water Needs of Landscape Plantings

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Worksheet for Estimating Landscape Water Needs Step 1: Calculate the Landscape Coefficient (KL) KL formula: KL = ks x kd x kmc ........................ ks = species factor kd = density factor kmc = microclimate factor ks = ______ (range = 0.1-0.9) (see WUCOLS list for values) kd = ______ (range = 0.5-1.3) (see Chapter 2) kmc = _____ (range = 0.5-1.4) (see Chapter 2) KL = _____ x _____ x _____ = _____ . (ks) (kd) (kmc) Step 2. Calculate Landscape Evapotranspiration (ETL) ETL formula: ETL = KL x ETo ........................... KL = landscape coefficient ETo = reference evapotranspiration KL = ______ (calculated in Step 1) ETo = _____ inches (listed in Appendix A for month and location) ETL = _____ x _____ = _____ inches. (KL) (ETo) Step 3. Calculate the Total Water to Apply (TWA) TWA formula: TWA = ETL ................................. ETL = landscape evapotranspiration IE .................................. IE = irrigation efficiency ETL = ______ (calculated in Step 2) IE = _______ (measured, estimated, or set) (see Chapter 5) TWA = ETL IE = ______ inches 34
Worksheet Example A landscape manager in San Bernardino is interested in estimating water requirements for a large planting of African daisy (Osteospermum fruticosum) for the month of July. The planting is in an open area and is not exposed to extraordinary winds for the area. The manager estimates that irrigation efficiency is 70% and, using the work-sheet, follows the three steps (see below). Step 1. KL = ks x kd x kmc ks = 0.2 (from WUCOLS list) kd = 1.0 (complete canopy cover and one vegetation type) kmc = 1.0 (open area, no extraordinary winds) KL = 0.2 x 1.0 x 1.0 = 0.2 Step 2. ETL = KL x ETo KL = 0.2 (from Step 1) ETo = 7.4 inches (for July in San Bernardino) (see Appendix A) ETL = 0.2 x 7.4 = 1.48 inches Step 3. TWA = ETL IE ETL = 1.48 inches (from Step 2) IE = 0.7 (70% irrigation efficiency estimated by landscape manager) TWA = 1.48 inches = 2.11 inches 0.7 (To convert 2.11 inches of water to gallons, see "Inches to Gallons".) The landscape manager has estimated that the groundcover will need 2.11 inches of water for the month of July. Using this estimate, the manager can develop an irrigation schedule. Other factors may need to be considered before deciding if this estimate is appropriate for the planting. Chapter 7 addresses these considerations. 35
Page 1 and 2: A Guide to Estimating Irrigation Wa
Page 3: A Guide to Estimating Irrigation Wa
Page 7: Contents Part 1—The Landscape Coe
Page 11 and 12: Introduction Part 1 leads you throu
Page 13 and 14: Chapter 1— Estimating Water Requi
Page 15: ation (ETo) for July in Monterey an
Page 18 and 19: In this example, a landscape coeffi
Page 20 and 21: The Landscape Coefficient Factors:
Page 22 and 23: Table 2— Irrigation Needs of Well
Page 24 and 25: in vegetation density, or leaf area
Page 26 and 27: Assigning Density Factor Values Can
Page 28 and 29: Plantings in a well-vegetated park,
Page 30 and 31: lar planting which is located on th
Page 32 and 33: erate (star jasmine), and high (dic
Page 35 and 36: Chapter 4— Using the Landscape Co
Page 37 and 38: Chapter 5— Irrigation Efficiency
Page 39: Total Water Applied Regardless of t
Page 45 and 46: Chapter 7— Using Water Estimates
Page 47 and 48: Chapter 8— Special Planting Situa
Page 49 and 50: As root development increases into
Page 51 and 52: considerations apply for individual
Page 53 and 54: Part 2 WUCOLS III* 1999 Edition L.
Page 55: REGIONAL COMMITTEES 1992 Front: B.
Page 59 and 60: Getting Started If you are using th
Page 61 and 62: assessment of species needs. If the
Page 63 and 64: Plant Types The species list includ
Page 65: As a result, species which are list
Page 68 and 69: species which can be grown in full
Page 70 and 71: Species Evaluations The three plant
Page 72 and 73: Species Evaluation List--1999 REGIO
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Species Evaluation List--1999 REGIO
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Common Names Index COMMON NAME Aaro
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Common Names Index COMMON NAME bamb
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Common Names Index COMMON NAME brak
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Common Names Index COMMON NAME carr
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Common Names Index COMMON NAME cone
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Common Names Index COMMON NAME Dutc
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Common Names Index COMMON NAME Fire
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Common Names Index COMMON NAME gold
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Common Names Index COMMON NAME horn
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Common Names Index COMMON NAME Keni
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Common Names Index COMMON NAME Marg
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Common Names Index COMMON NAME nect
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Common Names Index COMMON NAME phlo
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Common Names Index COMMON NAME red
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Common Names Index COMMON NAME sea
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Common Names Index COMMON NAME spri
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Common Names Index COMMON NAME toog
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Common Names Index COMMON NAME whit
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Turfgrasses _______________________
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where ETo measurements are being ta
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Appendix A—Table 2 Calculations o
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Hedera canariensis—Coastal and in
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Microclimate Factor (kmc) One of th
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Lindsey, P. and N. Bassuk, 1991,“
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• Species list on the Internet: w
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Guide to Estimating Irrigation Water Needs of Landscape Plantings

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