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Densely Planted Hydrozones
In a densely planted area where you have designed a Landscape Dripline grid,
use the Flow Rate Worksheet below to determine the total flow through your
grid. If you have any supplemental emitters, be sure to add in their adjusted
flows as well. For this example, we will assume coarse soil and will therefore
specify Landscape Dripline model LD-09-12-500 (0.9 GPH, 12" spacing, 500’ coil).
System Hydraulics Page 67
Once you know the total flow of your grid (30 GPM in this example), use Table 9-1
below to determine the number of zones and their respective sizes.
FLOW RATE WORKSHEET
Follow the example below to determine the flow rate:
To Get This: Do This: Calculations Totals
1. Length of tubing in feet: Determine the total length in feet from grid 2,000 feet
2. Length of tubing in inches: Multiply feet by 12 to get inches 2,000' x 12" = 24,000 inches
3. No. of emitters in the zone: Divide length by emitter spacing (12", 18", 24") 24,000" ÷12" = 2,000 emitters
4. Total no. of emitters: Round up to next whole number 2,000 = 2,000 emitters
5. Flow rate in GPH: Multiply no. of emitters by flow rate (0.6 or 0.9 GPH) 2,000 x 0.9 = 1,800 GPH
6. Flow rate in GPM: Divide GPH by 60 to get gallons per minute 1,800 ÷ 60 = 30 GPM
Use the worksheet below to determine the flow rate for your system:
To Get This: Do This: Calculations Totals
1. Length of tubing in feet: Determine the total length in feet from grid
2. Length of tubing in inches: Multiply feet by 12 to get inches
3. No. of emitters in the zone: Divide length by emitter spacing (12", 18", 24")
4. Total no. of emitters: Round up to next whole number
5. Flow rate in GPH: Multiply no. of emitters by flow rate (0.6 or 0.9 GPH)
6. Flow rate in GPM: Divide GPH by 60 to get gallons per minute
TABLE 9-1: MAXIMUM FLOW RATES
Sch. 40 PVC
Header Size
Max. Flow*
GPM
PSI Loss**
Poly Pipe
Header Size
Max. Flow*
GPM
PSI Loss**
1/2" 4.7 GPM 7.7 PSI 1/2" 4.7 GPM 8.8 PSI
3/4" 8.3 GPM 5.6 PSI 3/4" 8.3 GPM 6.3 PSI
1" 13.5 GPM 4.2 PSI 1" 13.5 GPM 4.8 PSI
1-1/2" 33.9 GPM 2.9 PSI 1-1/2" 33.9 GPM 2.9 PSI
2" 52.4 GPM 1.9 PSI 2" 52.4 GPM 2.2 PSI
Figure 9-4: Flow rate worksheet
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