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Rice Flood Guide

Filed Under:
Publication Number: F0810
Updated: November 16, 2015

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%. 

Contact Your County Office

Your Extension Experts

Assoc Extension/Research Prof
RICE PRODUCTION SOIL FERTILITY AND NUTRIENT MANAGEMENT FOR RICE,SOYBEAN AND CORN

Related Publications

Publication Number: IB0517
Publication Number: P3016
Publication Number: IB0472

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