Group Title: Research report - Bradenton Agricultural Research & Education Center - GC1979-12
Title: Calculation of irrigation water for seep irrigated land from riser flow rates
Full Citation
Permanent Link: http://ufdc.ufl.edu/UF00067725/00001
 Material Information
Title: Calculation of irrigation water for seep irrigated land from riser flow rates
Series Title: Bradenton AREC research report
Physical Description: 3 leaves : ; 28 cm.
Language: English
Creator: Csizinszky, Alexander Anthony, 1933-
Agricultural Research & Education Center (Bradenton, Fla.)
Publisher: Agricultural Research & Education Center, IFAS, University of Florida
Place of Publication: Bradenton Fla
Publication Date: 1979
Subject: Irrigation -- Florida   ( lcsh )
Soils, Irrigated -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
bibliography   ( marcgt )
non-fiction   ( marcgt )
Bibliography: Includes bibliographical references (leaf 3).
Statement of Responsibility: Alexander A. Csizinszky.
General Note: Caption title.
General Note: "August 1979."
Funding: Florida Historical Agriculture and Rural Life
 Record Information
Bibliographic ID: UF00067725
Volume ID: VID00001
Source Institution: Marston Science Library, George A. Smathers Libraries, University of Florida
Holding Location: Florida Agricultural Experiment Station, Florida Cooperative Extension Service, Florida Department of Agriculture and Consumer Services, and the Engineering and Industrial Experiment Station; Institute for Food and Agricultural Services (IFAS), University of Florida
Rights Management: All rights reserved, Board of Trustees of the University of Florida
Resource Identifier: oclc - 73169056

Table of Contents
        Page 1
        Page 2
        Page 3
Full Text


The publications in this collection do
not reflect current scientific knowledge
or recommendations. These texts
represent the historic publishing
record of the Institute for Food and
Agricultural Sciences and should be
used only to trace the historic work of
the Institute and its staff. Current IFAS
research may be found on the
Electronic Data Information Source

site maintained by the Florida
Cooperative Extension Service.

Copyright 2005, Board of Trustees, University
of Florida

"_ Agricultural Research &'Eddcation Center
LJ .... .-5IFAS, University of Florida
f 7 /l ardent ..F lord. HUIVTE LIBR[RARY
Bradenton AREC Research Report GC1979-12 Augu 1 19799199
Alexander A. Csizinszky .F.A.S. Univ. of Florida
Alexander A. Csizinszky
The determination of theoretical irrigation requirements for Florida
vegetable crops grown with the seep irrigated system was calculated by G. A.
Marlowe, Jr. and J. S. Rogers (1), and by G. A. Marlowe, Jr. and A. J. Overman
(2). Growers, however, may like to know how much water they are applying
for the crop at any specific time and at what rate, by measuring the rate of
flow through the risers at the heads of the lateral irrigation ditches. In
this paper an example is worked out for a tomato field to illustrate the method
of calculation. It must be pointed out that water flow rates, number of
irrigation days, number of plants, and the yield of tomatoes per acre may vary
from farm to farm and the examples in the calculations should not be used as
recommended water flow ratesor.plant numbers per acre. It is also assumed
that there is no fluctuation in water pressure, and that rainfall for the season
is zero. We use a 300 ft. long and 370 ft. wide land with a lateral irrigation
furrow spacing at 37 ft., i.e. 10 irrigation furrows to the land. The rate of
water flow is 1.75 gallons per minute (gpm) per riser except for the first and
last risers which have a flow rate of 2.6 gpm to compensate for the lateral
seepage loss to adjoining areas. Irrigation may be started 35 days before
setting plants in the field in order to provide adequate moisture in a zero
rainfall year for land preparation, formation of plant beds, fumigation and
laying of plastic mulch over the plant beds. The length of season from
transplanting to last picking is 110 days, which gives a total of 145 irrigation
days for the season. How many acre inches of irrigatin-water was applied to
the land during the season?
The following units are used in the calculations: 1 acre (A) = 43,560
sq ft.; 1 A inch (1 A in.) = 27,154 gals water.
1) Acre inches of irrigation water for the season 2
= flow rate of irrigation water x number of risers x total flow time x 43,560 ft /A
27,154 gal x sq ft of area irrigated

(2.6 gpm x 2 risers x 60 min 2
=[(1.75 gpm x 8 risers x 60 min x 24 hrs x 145 days) + x 24 hrs x 145 days)l x 43.560 ft
27,154 gal/A in. x 111,000 sq ft
=57.94 (58.00) A. in. of irrigation water applied for the season and this is
equal to 58.00 A. in.
145 days = 0.4 A in. per day.
Expressed in gallons: 48.00 A in. x 27, 154 gal/A in. = 1,573,300 gallons per season
or 10,850 gal per day (gpd).

To calculate the total amount of water required to raise a crop the amount
of water needed to grow the transplants and the water used for the application of
pesticides also have to be considered.

2) If the rate of irrigation is required for any particular time when the
flow rate through the risers is known, then the same method of calculation is used,
changing only the flow time in the above formula. For example, we want to know
how many acre inches of irrigation water the land received at the flow rate of
2 gpm per riser for a 1 day period.

Irrigation water in A in. for 1 day

= 2 gpm x 10 risers x 60 min x 24 hrs x 43,560 sq ft/A
27,154 gal/A in. x 111,000 sq ft

= 0.416 A in. per day

in gallons: 0.416 A in. x 27,154 gal/A in = 11,196 gal per day (gpd).

In metric units the calculations will be as follows:
Units used:

ft = 0.305 meter (m)
gal = 3.785 liters (L)
acre = 4,047 m2

1 m = 10.764 sq ft 2
1 hectare (ha) = 10,000 m
1 cubic meter (m3) = 1,000 L

To transform the parameters from the U.S. system to metric
example #1 above: area of 111,000 sq ft = 10,312 m2, flow rate
6.624 liters per minute (Lpm) and 2.60 gpm = 9.841 Lpm.

system in
of 1.75 gpm =

2 a
Liters of irrigation water per m per season :

(6.624 Lpm x 8 risers x 60 min x 24 hrs x 145 days) +
10,312 m4

(9.841 Lpm x
x 24 hrs

2 risers x 60 min
x 145 days)

= 1,472 L of irrigation water per m2 per season.

This is equal to 1,472 L/m2 10.15 L/m2/day.
145 days15 L/m/day
For a 1 ha area the amount of irrigation water applied in m3/season:

1,472 L/m2/season x 10,000 m2
1,000 L

season, or

= 14,720 m3 of irrigation water per ha per

14,720 m3/ha
14,75 days = 101.52 m3/ha/day.
145 days

aln Europe, where the metric system is extensively used, the irrigation
water and rainfall is expressed in millimeters (mm) only. The reason is that
1 mm deep water on a 1 m? area is equal to 1 L/m2. Reporting the water in mm
per season one can calculate the volume of water applied for a particular area.
The calculation from mm to L/m2 is as follows: 1 m = 1,000 mm; 1 m2 = 1,000 mm
x 1,000 mm = 1,000,000 mm2; 1 mm deep water on 1 m2 = 1,000,000 mm2 x 1 mm =
1,000,000 mm3 = 1,000 cm3 = 1 L/m2.

x 24 hrs x 145 davs)

If we want to convert acre inches of water to liters per m2 then the
following formula can be used:

A in. applied x gal per A in. x liters per gallon
m2 per acre

In example #1 we applied 58.00 A in. of irrigation water per season.
many liters of water did we apply per m2?


58.00 x 27,154 x 3.785 L = 1,472 L/m2/season
4,047 m2

In short form we can use the factor of 25.38 to multiply the number of
A in. to get the result in L/m2. From the above example:

58.00 A in. x 25.38 = 1,472 L/m2/season.


1. Marlowe, G. A., Jr., and J. S. Rogers.
vegetable crops. Vegetable Crop Extension
University of Florida.


Water use by Florida
No. 16-1976. IFAS,

2. Marlowe, G. A., Jr., and A. J. Overman. 1977. A rationale for the deter-
mination of irrigation needs for vegetable crops grown with seep irrigation.
Bradenton AREC Research Report GC1977-78.

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