Drip Irrigation Design Guide-Calculating Total Flow & Creating Watering Zones

Drip Irrigation Design Guide-Calculating Total Flow & Creating Watering Zones


Designing & Planning Your System

  Content Covered in this Section:   

   Planning Your Layout

   Grouping Plant Types

   Determining Your Water Source Flow Rate & Pressure

   Water Connection Options

   Calculating Total Flow & Creating Watering Zones

   Watering Schedules

   Design FAQs

Go To HOME

 

Calculating Total Flow & Creating Watering Zones

When planning your drip system, it’s important not to exceed your drip zones water source capacity. To determine a flow zones capacity, add up the total number of drip emitters and their flows. This same method applies for micro sprays and jets.

Example: Your drip irrigation plan calls for using a total of 80 drip emitters and 40 ft of soaker hose dripline. The emitters consist of 25 – 2 GPH, 15 – 1 GPH, 40 - 1/2 GPH drip emitters and 40 ft of soaker hose dripline with 6" spacing with 1/2 GPH emitters. The plan also includes using 4 micro sprayers for ground cover at 10 GPH each.

To calculate the overall flow rate:

25 – 2 GPH Emitters (25 x 2) = 50 Gallons per hour

15 – 1 GPH Emitters (15 x 1) = 15 Gallons per hour

40 – 1/2 GPH Emitters (40 x .5) = 20 Gallons per hour

40 Ft soaker hose drip line (40 / .5) x .5) = 40 Gallons per hour

4 – 10 GPH Micro Sprayers (4 x 10) = 40 Gallons per hour

Total flow rate = 165 GPH or 2.75 GPM. If the max capacity of 1/2" drip tubing is 240 GPH, you will have a flow reserve of 75 GPH or 1.25 GPM.

If your drip systems flow demand exceeds its water source capacity, you will need to create a new water zone. Installing a hose splitter will give you extra water source connections for additional drip zones.

QUICK TIP: When planning a drip zone, be sure to leave enough flow for future system expansions or when plants mature and require more water.

QUICK TIP: Install flow control valves on both 1/2" & 1/4" drip tubing to isolate and control water to various sections of your drip system.

<<Previous Page                                                                                                                                                                                        Next Page>>