Rice Flood
Guide
This
guide will help you determine the pumping time required to
flood a certain field to a 4" depth. The values listed are
not absolute; they do not take into consideration losses
that may occur due to soil type, field configuration, crop
and weather demand, or other factors that may affect the
flow in the field.
The
guide will help save as much water as possible and keep
pumping costs in line. Other guidelines for rice irrigation
are also listed.
Basis:
4"/Acre Flood
Total Seasonal Water Use: 23" -- 26"
Average Daily Water Use: 0.25"/Day
Fuel
Consumption per Acre-inch
|
Diesel
|
50'
Lift - 0.45 gallons/Acre-inch
75' Lift - 0.70 gallons/Acre-inch
100'Lift - 0.90 gallons/Acre-inch
|
|
Electric
|
50'
Lift - 6.4 KWH/Acre-inch
75' Lift - 9.6 KWH/Acre-inch
100' Lift - 12.8 KWH/Acre-inch
|
Well
Size
Minimum - 8 gpm/Acre
Maximum - 30 gpm/Acre
Well
Capacity
Acre-inches per hour=GPM/450
Pumping
time to replace daily water use of 0.25" based on total
pumping time required for initial flood of 4 inches.
|
Pumping
Time (hours)**
|
|
4"
Flood
|
0.25"
Daily Use
|
4"
Flood
|
0.25"
Daily Use
|
|
60
|
3.8
|
150
|
9.4
|
|
70
|
4.4
|
160
|
10.0
|
|
80
|
5.0
|
170
|
10.6
|
|
90
|
5.6
|
180
|
11.3
|
|
100
|
6.3
|
190
|
11.9
|
|
110
|
6.9
|
200
|
12.5
|
|
120
|
7.5
|
210
|
13.1
|
|
130
|
8.1
|
220
|
13.8
|
|
140
|
8.8
|
225
|
14.1
|
**Example:
It takes between 8.1 - 8.8 hours daily pumping to replace
the 0.25" on the basis that it takes between 130 and 140
hours total to pump 4" on the whole field.
Daily
water use is an average value for the whole season; peak
water use is approximately 0.30" per day. This will occur
during late vegetative and reproductive periods, so you may
need to adjust pumping times to meet this higher demand
period.
|
Total
Hours Pumping Time for a 4-Inch Flood
|
|
GALLONS
PER MINUTE (GPM)
|
|
|
|
GPM
|
400
|
600
|
800
|
1000
|
1200
|
1400
|
1600
|
1800
|
*2000
|
2200
|
2400
|
2600
|
2800
|
3000
|
3500
|
4000
|
|
|
|
|
45
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
10
|
|
|
|
90
|
60
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
20
|
|
|
|
135
|
90
|
68
|
54
|
|
|
|
|
|
|
|
|
|
|
|
|
30
|
|
|
|
180
|
120
|
90
|
72
|
60
|
|
|
|
|
|
|
|
|
|
|
|
40
|
|
|
|
225
|
150
|
112
|
90
|
75
|
64
|
56
|
|
|
|
|
|
|
|
|
|
50
|
|
|
H
|
|
180
|
135
|
108
|
90
|
77
|
68
|
60
|
|
|
|
|
|
|
|
|
60
|
|
|
|
|
210
|
158
|
126
|
105
|
90
|
79
|
70
|
63
|
57
|
|
|
|
|
|
|
70
|
|
|
|
O
|
240
|
180
|
144
|
120
|
103
|
90
|
80
|
72
|
65
|
60
|
|
|
|
|
|
80
|
|
|
|
|
|
202
|
162
|
135
|
116
|
101
|
90
|
81
|
74
|
68
|
62
|
|
|
|
|
90
|
|
|
|
|
U
|
225
|
180
|
150
|
128
|
112
|
100
|
90
|
82
|
75
|
69
|
64
|
60
|
|
|
100
|
|
|
|
|
|
|
198
|
165
|
141
|
124
|
110
|
99
|
90
|
82
|
76
|
71
|
66
|
|
|
110
|
|
|
|
|
|
R
|
216
|
180
|
154
|
135
|
120
|
108
|
98
|
90
|
83
|
77
|
72
|
62
|
|
120
|
|
|
|
|
|
|
234
|
195
|
167
|
146
|
130
|
117
|
106
|
98
|
90
|
84
|
78
|
67
|
58
|
130
|
|
|
|
|
|
|
S
|
210
|
180
|
158
|
140
|
126
|
114
|
105
|
97
|
90
|
84
|
72
|
63
|
140
|
|
|
|
|
|
|
|
225
|
193
|
169
|
150
|
135
|
123
|
112
|
104
|
96
|
90
|
77
|
68
|
150*
|
|
|
|
|
|
|
|
|
206
|
180
|
160
|
144
|
131
|
120
|
111
|
103
|
96
|
82
|
72
|
160
|
|
|
|
|
|
|
|
|
218
|
191
|
170
|
153
|
139
|
128
|
118
|
109
|
102
|
87
|
77
|
170
|
|
|
|
|
|
|
|
|
231
|
202
|
180
|
162
|
147
|
135
|
125
|
116
|
108
|
93
|
81
|
180
|
|
|
|
|
|
|
|
|
|
214
|
190
|
171
|
155
|
142
|
132
|
122
|
114
|
98
|
86
|
190
|
|
|
|
|
|
|
|
|
|
225
|
200
|
180
|
164
|
150
|
138
|
128
|
120
|
103
|
90
|
200
|
|
|
|
|
|
|
|
|
|
|
210
|
189
|
172
|
158
|
145
|
135
|
126
|
108
|
95
|
210
|
|
|
|
|
|
|
|
|
|
|
220
|
198
|
180
|
165
|
152
|
141
|
132
|
113
|
99
|
220
|
|
|
|
|
|
|
|
|
|
|
230
|
207
|
188
|
172
|
159
|
148
|
138
|
118
|
104
|
230
|
|
|
|
|
|
|
|
|
|
|
|
216
|
196
|
180
|
166
|
154
|
144
|
123
|
108
|
240
|
|
|
|
|
|
|
|
|
|
|
|
225
|
204
|
188
|
173
|
161
|
150
|
128
|
113
|
250
|
|
|
|
|
|
|
|
|
|
|
|
|
225
|
209
|
190
|
117
|
165
|
141
|
124
|
275
|
|
|
|
|
|
|
|
|
|
|
|
|
|
225
|
208
|
193
|
180
|
154
|
135
|
300
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
225
|
209
|
195
|
167
|
146
|
350
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
225
|
210
|
180
|
158
|
350
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
225
|
193
|
169
|
375
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
206
|
180
|
400
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
218
|
191
|
425
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
231
|
103
|
450
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
214
|
475
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
225
|
500
|
|
*Example:
With 2000 gallons per minute on 150 acres it takes a minimum
of 135 hours to pump 4" on the whole filed. Average daily
water use is 0.25"/day.
When
flooding a dry field, you will probably need to pump an
additional inch of water to take care of soil requirements
and leaks in levees. This will mean increasing pumping time
by 25%.
By
James G. Thomas
Extension Agricultural Engineer
Mississippi
State University
does not discriminate on the basis of race, color, religion,
national origin, sex, age, disability, or veteran status.
Form
810
Extension Service of Mississippi State University,
cooperating with U.S.
Department of Agriculture.
Published in furtherance of Acts of Congress, May 8 and June
30, 1914. Ronald A. Brown, Director
Copyright
by Mississippi State University. All rights reserved.
This document may be copied and distributed for nonprofit
educational purposes provided that credit is given to the
Mississippi State University Extension Service.
|
