Irricad

Hi ..
If I had a Palms Orchard and I want to design a drip lines for each Palm 2 drips (half meter distance between them) with noting that the distance between the Palm and Palm 8 meters on the single drip line with noting the distance between the drip lines is 8 meters, Now the Problem is how to put drippers unevenly on the single drip line !!!

Hi Rafat,

Apart from creating a custom tape to match the 'specific discharge rate', there is another way to do this in Irricad for this particular scenario. We can do this by using spraylines instead of using tapes. To simulate the emitters we need to create outlets/nozzles to match the flow rate of the emitters.

This method allows us to draw spraylines and place our outlets/nozzles as required.

I have rushed this response, so hopefully the attached PDF will explain. You will need to configure the numbers as required to suit your design.

Thanks Kosi for the clarification, I've had this idea in my mind as well, and you confirmed this to me, of course i will use Copy and paste method to replicate the drip line, this method may seem slowly to complete the design with large areas, I hope to Develop an easiest way to do this in the next versions of the IrriCAD program, Greetings ...

Hi Rafat

If the situation that you have is that you use only 2 drippers per tree (it seems to be not enough for the arid area -except it is at least 24 lph each) you can create a special tape where the flow that you are using per tree is twice the dripper flow with 8m spacing .
With the way that Kosi recomended you need to take into consideration a lower value of C facor of Hazen Williams due to the local Head loss from the barb of the dripper e.g. reduce the C value from 140 to 130 depend on the diameter of the Lateral

Rafat,

The best way to determine the correct C factor for Hazen Willimans is to 'find' the C factor which gives the same headloss in the "sprayline" you have created as the tape.
What I do is run out several lines of the tape (e.g. 100m, 200m, 300m if the rows lengths vary in your design). Then I run out the same lengths of the "sprayline" with the outlet at the same spacing.
I then connect all the lines to some zone pipe and connect a valve. I analyse the zone and using Object Info I check the headlosses in the tapes and spraylines. I change the C factor in the "sprayline" and re-analyse until the headloss matches the headloss in the tapes.
It is best to turn off "Minor Losses" in Design|Zone Design Configuration table when designing spraylines which simulate tapes.

Rafat,

Just a quick note to mention for this design it is easiest to just create a custom tape with double the constant and barb factor and set the spacing at 8m.