Digital Drip Designer

For widely spaced trees emitter spacing is same as tree spacing

For continuous wetting along row calculate spacing as follows:

Emitter Discharge, gph: *
Root Depth,ft:
Spacing for Coarse soil,ft:
Spacing for Medium soil,ft:
Spacing for Fine soil,ft:

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Calculations Used:

 Emitter spacings are calculated based on the chart below, EXCEPT where rooting depth is less than the emitter spacing.


Where rooting depth is less than the emitter spacing, a ratio of emitter spacing (S) and plant rooting depth (D) is used. If the ratio S/D exceeds the values listed below, the value S/D is used instead of the chart values to determine the emitter spacing:

                                              Coarse soil               Medium soil                  Fine soil
                                  S/D            1.0                           2.0                              4.0

Example:
        Emitter flow rate: 1 gph
        Root depth:          1.5 ft
        Medium soil
From the chart, emitter spacing is 3.3 ft, and S/D = 3.3/1.5 = 2.2>2.0. Since S/D>2.0, S/D = 2.0 must be used in the calculation, or S = 2D = 2 x 1.5 = 3.0 ft. Therefore, a spacing of 3.0 ft is used instead of 3.3 ft.

Reference: Hung, Joe Y.T. 1995. Determination of Emitter Spacing and Irrigation Run Time Including Plant Root Depth. Microirrigation for a Changing World: Conserving Resources/Preserving the Environment. Proceedings of the Fifth International Microirrigation Congress, Orlando, Florida. ASAE Publication 4-95. American Society of Agricultural Engineers. pp. 292-296.