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Accounting for Multiple Water Sources or Points of Connection (POCs)

Some irrigation system designs will require you to account for more than one water source or point of connection (POC). For example, a site might draw water from two or more water meters or wells that you need to tie into your system.

 

Before attempting to account for multiple water sources, you'll want to familiarize yourself with our Source Data tool. You'll use Source Data to configure all water sources for your project and place them in your drawing.

Multiple POCs or Water Meters Feeding into the Same Tee

Does your site draw water from two or more water meters that will be feeding into different sides of the loop? If so, follow our steps for multiple water meters, opposite sides.

Some irrigation system designs will require you to account for more than one water source into one tee. For example, a site might draw water from two or more wells that you need to tie into your system. Our Custom POC feature allows you to show these multiple POCs or meters in your drawing for design purposes, but combine them into a single source for the purposes of calculation. Essentially, you'll be treating the combination of all your POCs as a single water source that will reflect their cumulative flow. If you have water meters that will feed into the same tee, you'll add them as a single POC for the purpose of calculation.

 

In the following example, we'll show you how to design a system that draws water from two wells – one with a 60 GPM flow and 100 psi of pressure, and the other with a 100 GPM flow and 100 psi of pressure.

 

 

First, select the Custom Max Available option under Water Source Flow.

 

Enter the total flow of all your POCs in the flow field. In our example, we'll enter 160 (for our two wells' 60 + 100 GPM).

 

If you want, write a description of your system in the Description box.

 

Enter your system's anticipated pressure in the Static Pressure at Service field. In our example, both of our wells have a pressure of 100 psi, so we'll enter 100.

 

Click OK to save your changes.

Unlike flow, pressure from multiple POCs isn't cumulative. In general, just enter the pressure from the source with the highest pressure.

 

Click New to add a new POC, and continue to do so until you arrive at the number of POCs you need.

 

In our example, we only need one additional POC, so we only need to click New once.

 

 

 

Once you've added all your POCs, it's time to place them in your drawing. Select your first POC, and click Place to place it. Then place your second POC in the same way.

 

Need to change the name of a POC as it appears in the drawing? Right-click it, and select Edit Attribute from the menu that opens. You can then enter any value you want in the Value field.

 

 

Now it's time to connect our POCs with mainline using the Draw Mainline tool. We'll then tee off with another length of mainline that will connect to the rest of the system.

 

 

 

Now create and place a third POC that will hold the pressure and flow of the the other 2 POCs. Place it at the tee so it's connected to the two other POCs. This step essentially transforms the third POC at the tee into the de facto water source for our system, since it funnels all available flow into the rest of the system.

 

 

 

When sizing the mainline, select the third POC (the one at the tee) to size.

 

Before you run an Irrigation Schedule, put the third POC on its own layer and freeze that layer. The schedule won't pick up the third POC but iwill list the other two as needed.

Multiple Water Meters Feeding Different Sides of the Loop

Irrigation F/X treats water meters a little differently from other POCs when they won't be right next to each other feeding the same tee. If your site draws water from multiple meters that are in different locations of your project site, you'll need to complete the following steps to account for these multiple meters.

1. Because your meters are on opposite sides of the mainline loop, remove the pieces of the mainline that are creating the loop.

 

 

2. Use our Draw Mainline tool to create two separate loops – either an upper loop and lower loop, or a right and left loop. Note that these loops will be temporary; you'll just use them to size your mainline before re-creating your main loop.

 

 

3. Size the mainline pipe connected to each meter.

 

The system sizes for a single source or POC at a time. If common pipe is used by multiple POCs, you'll need to be careful to size those with the highest demands last.

 

Note that you can use the Select Valves button in the Size Mainline dialog to size only the pipe necessary for a certain range of valves.

 

 

 

4. Remove the temporary mainline pieces from each loop, and connect the original pieces of mainline back together.

 


5. If you need to show the size of the two pieces of mainline, use our View Data/Edit Equipment tool, select the mainline you need to size, and change the size manually.

Do not size the mainline again once you've put the original loop back together (Step 4). If you do, you'll have to start this process over.

Multiple Sources and the Irrigation Schedule

The Irrigation Schedule will list all your POCs or water meters unless you tell it not to. For details, pease see our instructions for listing only one of your sources in the schedule.

Multiple Sources and the Runtime Schedule

Our Runtime Schedule tool allows you to account for multiple water sources or POCs as well.

Troubleshooting

Issue: Points of Connection (POCs) are showing up with duplicate numbers or letters in the Runtime Schedule dialog box

Last modified on Friday, 21 June 2019 09:53
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