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Formulas
Calculating
Rates
| Irrigation Formulas |
| Sprinkler precipitation rate = (gallons
per minute x 96.3) divided (spacing length x spacing width) |
| Minutes to irrigate per day = (water required per week
divided days per week available) divided precipitation rate |
| Voltage loss in wiring = (2 x wire length x amps x
wire size resistance) divided 1,000 |
| Estimating tons of material (Sand, gravel,
greensmix to cover a given area) |
| Area in square feet x desired depth (feet)
= cubic feet |
| Cubic feet divided 27 = cubic yards |
| Cubic yards x 1.3 = tons |
| Tons x (100% divided percentage needed for waste)
= tons required |
| (an extra 10-20% is usually allowed for waste in
handling and compaction of mix) |
| Estimating fill dirt and topsoil volumes |
| Volume = surface or cross-sectional area x thickness
or length (assuming uniform thickness/length for the area and using
same units [e.g., both area and length in yards or both in feet]) |
| Granular Materials |
| lbs required to treat area = lbs aia x (ft to be
treated divided 44,000 sq ft/acre x 1000 divided % granular) |
| Wettable Powders |
| lbs required to treat area = lbs aia x (ft to be
treated divided 44,000 sq ft/acre) x (100 divided % powder) |
| Liquid Concentrations |
| gal required to treat area = lbs aia x (ft to be
treated divided 44,000 sq ft/acre) x (1 divided lbs active ingredient/gallon) |
Granular
Rate Conversion Table
| Percent |
Recommended Rate |
Application Rate |
| 5% |
0.5 lb/acre |
10 lbs/acre |
| 5% |
1 lb/acre |
20 lbs/acre |
| 5% |
1.5 lbs/acre |
30 lbs/acre |
| 5% |
2 lbs/acre |
40 lbs/acre |
| 5% |
3 lbs/acre |
60 lbs/acre |
| 5% |
4 lbs/acre |
80 lbs/acre |
| 10% |
0.5 lb/acre |
5 lbs/acre |
| 10% |
1 lb/acre |
10 lbs/acre |
| 10% |
1.5 lbs/acre |
15 lbs/acre |
| 10% |
2 lbs/acre |
20 lbs/acre |
| 10% |
3 lbs/acre |
30 lbs/acre |
| 10% |
4 lbs/acre |
40 lb/acre |
| 20% |
0.5 lb/acre |
2.5 lbs/acre |
| 20% |
1 lb/acre |
5 lbs/acre |
| 20% |
1.5 lb/acre |
7.5 lbs/acre |
| 20% |
2 lbs/acre |
10 lbs/acre |
| 20% |
3 lbs/acre |
15 lbs/acre |
| 20% |
4 lbs/acre |
20 lbs/acre |
| 25% |
0.5 lb/acre |
2 lbs/acre |
| 25% |
1 lb/acre |
4 lbs/acre |
| 25% |
1.5 lb/acre |
6 lbs/acre |
| 25% |
2 lbs/acre |
8 lbs/acre |
| 25% |
3 lbs/acre |
12 lbs/acre |
| 25% |
4 lbs/acre |
16 lbs/acre |
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