# 1-30 - BIE 5110/6110 Sprinkle Trickle Irrigation Fall...

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BIE 5110/6110 Sprinkle & Trickle Irrigation Fall Semester, 2004 Assignment #8 (100 pts) Trickle System Design Calculations Due: 01 Dec 04 Do you work in an organized, neat way. Write down any assumptions you make. Given: A mature walnut orchard will be drip-irrigated. Use a single lateral per row of trees. Irrigated area is 44 ha. Tree spacing is 6.2 x 6.2 m. Peak daily ET is U d = 4.9 mm/day. Seasonal water requirement: U = 541 mm. Effective rain, peak-use period: assume zero. Residual soil water in the spring: assume zero. Use an MAD of 25%. Soil water holding capacity is 178 mm/m. Water source: deep well with maximum discharge of 125 lps. Irrigation water quality: EC w = 0.61 dS/m. Root zone depth is 2.0 m. Shaded area is 75%. Emitter equation: 0.53 q0 . 3 2 P = for q in lph; and P in kPa. Nominal emitter flow rate: q a = 4 lph. Manufacturer coefficient of variation: 0.062. Average wetted width at 4 lph: w = 2.33 m. Outlets per emitter: one. 1

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2 Required: 1. Use metric units in your calculations. 2. Select an appropriate emitter spacing, S e (m). 3. Determine the number of emitters per tree, N p . 4. Calculate percent wetted area, P w . Use the equation from Lecture 18 (includes P d in the denominator). Make sure P w is between 33% and 67%; if not, increase N p as necessary.
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1-30 - BIE 5110/6110 Sprinkle Trickle Irrigation Fall...

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