To figure inches of water applied
during an irrigation: Multiply cfs at your farm turnout by time in hours and divide by
acres being irrigated.District Water Management
General Water Measurement Information:
1 cubic foot per second (cfs) = 2 acre feet in 24 hours.
1 cubic foot per second (cfs) = 1 acre inch per hour.
1 cubic foot per second (cfs) = 450 gallons per minute.
1 cubic foot per second (cfs) = 7.5 gallons per second.
1 cubic foot per second (cfs) = 50 California miner inches.
1 California miner inch = 9 gallons per minute.
1 acre foot = the amount of water required to cover one acre, one foot deep.
1 acre foot = 325,850 gallons.
To figure inches of water applied
during an irrigation: Multiply cfs at your farm turnout by time in hours and divide by
acres being irrigated.
Example: 2 cfs applied to 6 acres in 12 hours.
2 cfs x 12 hours = 4 inches applied
6 acres
KRD's annual allotment in a 100% water year is 2.5 cfs per acre of assessed
land owned.
If you own 20 acres your allotment will be 50 cfs for the irrigation season (2.5x20).
Gauge Height Readings
(Cubic Foot per Second given to closest tenth)
| Miner’s Inches |
Cubic Feet per Second |
Acre Feet in 24 Hours |
Gage Height (ft.) |
||
|---|---|---|---|---|---|
| 2 Foot Weir | 3 Foot Weir | 4 Foot Weir | |||
| 25 | 0.5 | 1 | 0.18 | 0.14 | 0.11 |
| 50 | 1.0 | 2 | 0.28 | 0.22 | 0.18 |
| 75 | 1.5 | 3 | 0.37 | 0.28 | 0.23 |
| 100 | 2.0 | 4 | 0.45 | 0.34 | 0.28 |
| 125 | 2.5 | 5 | 0.52 | 0.40 | 0.33 |
| 150 | 3.0 | 6 | 0.59 | 0.45 | 0.37 |
| 175 | 3.5 | 7 | 0.65 | 0.49 | 0.41 |
| 200 | 4.0 | 8 | 0.71 | 0.54 | 0.45 |
More Info:
|
| KRD's Telemetry,
Gage Station, and Data Acquisition System
|
| Bureau of Reclamation's
Water Measurement Manual
|
Cipolletti weir tables: |
| 0.61 - 1.67 foot head, 2.0 - 5.0 foot weir length.
|
| Gallons per minute to CFS conversion charts: |
| Page 1 (1 to 200 GPM) |
| Page 2 (201 to 450 GPM) |