Atm Irrigation

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Sprinkler rates

SPRINKLER IRRIGATION SYSTEM ANALYSIS 11/8/2000

BASIC DATAplant or croppredominate soil typeaverage field slope, %area to be irrigated, square ftruntime or irrigation duration per day, hr vary to meet irrigation needspeak consumptive use or ET (in/day) from Table 1system efficiency use 0.7 for sprinkler effective root depth, in. from Table 2

AVAILABLE WATER CAPACITY from Soils 5 or Table 3layer thickness AW AWC

in in/in in12345

TOTAL 0 0.0 total thickness cannot exceed effective root d

SYSTEM DESIGN LIMITATIONS% depletion to initiate irrigation use 50 for sprinkler net application, in 0.0 available water times % depletionrequired application, in. net application / system efficiencymin. irrig. freq, days net application / ETrequired application rate, in/hr to replace depleted water in runtime aboverequired application rate, gpmrequired application rate, gph

maximum application rate, in/hr from Table 4 (to prevent runoff and erosion)maximum application rate, gpmmaximum application rate, gph

min. system capacity, gpm to equal ET (if irrigation system is run continu

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Sprinkler rates

pth

usly)

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RECTANGULAR AREA SPRINKLER IRRIGATION HEAD ANALYSISreference: Landscape Irrigation Design by E. W. Rochester 12/3/1999

Area To Be Irrigated:length, ft. 120width, ft. 170

Sprinkler Head Specifications (from manufacturer):Manufacturer SeriesNozzleTypePattern, degrees 360 180 90Flow Rate, gpmPressure, psiDesign Throw Radius, ft.

Sprinkler Head Layout s for square or t for triangular Design Wind Speed, mph 0-3 mph, 4-7 mph, 8-12 mphks from Table 1, this sheet

Calculated Spacing, S calc 0.0 feetCalculated L for triangular feet

Recommended Spacing, length #DIV/0! feetRecommended Spacing, width feet

Pattern, degrees 360 180 90 degreesNumber of Sprinkler Heads #DIV/0! #DIV/0! 4 each

Area Irrigated / Sprinkler Head #DIV/0! #DIV/0! #DIV/0! ft2

Precipitation Rate #DIV/0! #DIV/0! #DIV/0! inches/hour

Total Irrigated Area, ft 2 #DIV/0!Total Flow to Irrigated Area, gpm #DIV/0!


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MICRO IRRIGATION SYSTEM ANALYSIS

BASIC DATAbase plantpredominate soil typetype of micro-irrigation (P or L)peak consumptive use or ET (in/day)canopy diameter, feetcanopy width, feetplant spacing, feetwetted area reduction ratio 1.00wetted area, ft 2

irrigation efficiencyplant water usage, gal/dayemitter flow rate, gpheffective root depth, inchescalculated number of emitters per plantplanned number of emitters per plantallowed % depletion after irrigation

AVAILABLE WATER CAPACITYlayer thickness AW AWC

in in/in in12345

TOTAL 0 0.0

irrigation interval, daysvolume to apply, inches per irigation intervalvolume to apply, gal per irrigation intervalirrigation run time per irrigation interval, hoursplanned irigation run time per application, hoursrequired applications per irrigation intervalapplication rate per plant, inch/hour application rate per plant, gpmapplication rate per plant, gph

SUMMARYemitter brand, series, model

base plantemitters per plantemitter flow rate, gphirrigation run time, hoursirrigation interval, days


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Table 1

Peak Daily and Total Seasonal Consumptive Water Use 11/11/1998of Selected Plants in Michigan

Adapted from: Irrigation Principles and Practices, third edition;by O. W. Israelsen and V. E. Hansen; Wiley and Sons, Inc., NYby M. Vitosh and Landscape Irrigation Design by E. W. Rochester;

ASAE, St. Joseph, Mi.

Agricultural Crops Peak Daily Total SeasonUse, inches/day Use, Inches

alfalfa 0.22 26pasture 0.22 24small grains 0.18 14sugar beets 0.20 20field beans 0.18 12corn 0.25 20potatoes 0.20 18field peas 0.18 9tomatoes 0.17 17

tree fruit 0.18 20

Landscape Plants Peak Daily Total SeasonUse, inches/day Use, Inches

turfgrass 0.25 25groundcover, annual flower beds,evergreens, perennials, shrubs 4 ft. 0.18 18established native plants 0.10 10

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Table 2

Effective Rooting Depths (irrigation depth) 11/11/1998From: Chapter 12 of the Michigan Irrigation Guide by M. L. Vitoshand Landscape Irrigation Design by E. W. Rochester; ASAE, St. Joseph, Mi.

Plant root depthinches

alfalfa 36 to 72cabbage 18 to 24carrot 18 to 24corn 30 to 48cucumber 18 to 24field bean 12 to 24lettuce 6 to 12onion 12 to 18pasture 18 to 36peas 12 to 24potato 18 to 24small grain 24 to 36

soybean 18 to 24strawberry 6 to 12sugar beet 24 to 36tomato 12 to 24perennial grass 6 to 12groundcover 12 to 24low shrubs 12 to 24shrubs and trees, 3 - 5 ft. tall 24 to 36shrubs and trees, 5 - 10 ft. tall 36 to 60shrubs and trees, 10 - 20 ft. tall 48 to 60shrubs and trees, > 20 ft. tall > 72

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Table 3

General Range of Available Moisture-Holding Capacities 11/11/1998and Average Design Values for Normal Soil Conditions.Reference: USDA, NRCS, Engineering Field Manual

Available Water Soil Texture Range Average

in./in. in./in.Very coarse-textured sands and fine sands 0.04-0.08 0.06Coarse-textured loamy sands and loamy fine sands 0.06-0.10 0.08Moderately coarse-textured

sandy loams and fine sandy loams 0.10-0.15 0.13Medium textured very fine sandy loams, loam and silt loams 0.13-0.19 0.16Moderately fine-textured sandy clay loams, clay loams, and silty clay loams 0.15-0.21 0.18Fine-textured sandy clays, silty clays,

and clay 0.13-0.21 0.17

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Table 4

Suggested Maximum Water Application Rates for Sprinklers for Average 11/11/1998Soil, Slope, and Cultural Conditionsreference: Soil and Water Engineering by Schwab, et al., 4th edition, Wiley & Sons, Inc

Maximum Water Application Rate, in/hr Soil Texture and Profile Conditions 0% slope 10% slope

w/cover bare w/cover bare A. light sandy loams uniform in texture to 5 ft. 1.3 0.8 0.7 0.4B. light sandy loams over more compact subsoils 1.0 0.6 0.5 0.3C. silt loams uniform in texture to 5 ft. 0.6 0.4 0.4 0.2D. silt loams over more compact subsoil 0.4 0.2 0.2 0.1E. heavy-textured clays or clay loams 0.2 0.1 0.1 0.1

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