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Nibal Ata
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Dear Experts and irrigation designers,

Need some of your advice from your experience when working on huge irrigation projects..

I have a project of peak irrigation demand 562230 l/day.. 
which strategy do you follow in general in big projects?

what are the considerations you are taking in mind while designing the irrigation plan?

I need to know how everyone of you can deal with a big project, specifically when the plants are so dense, and located randomly.

which irrigation system do you think is the best to use in such situation and can work effectively?

If you have climbers in the project, what do you usually use to water them?

Appreciate every single advice and input..

 

Thank you in advance,

Nibal 

 

 

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Tom Lang Pending Moderation
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06/30/2020 @ 9:07 am
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Hi Nidal,

 

Here are a few things to keep in mind and to do when working on big systems:

 

  • Know your source!  Work within the available volume and pressure.
  • Start with the areas farthest from the source.  These will have the greatest demand.  Make use of the schematic irrigation tool, rough in some main line, and test.
  • Have a clear picture of your hydrozones; plan ahead before piping.
  • I generally place all my sprinklers or drip zones before dividing them into control zones.
  • Size zones as you complete them, then size the main line to check your hydraulics.  If demand leaves less than 5% of the available pressure, I adjust the zone sizes.
  • Irrigation method depends on many things:  plant types, turf areas, exposure, local regulations regarding water use, type of project (high traffic public park, or private estate?), etc.  While drip line irrigation is used often here in the Pacific Northwest US, we mostly use pop-up sprinklers (though this more because of customer and contractor demand).  In dense planting areas, I try to keep the sprinkler radii to no more than 15 feet (4.5m) to limit blocked spray.
  • Climbers:  If they're planted in a larger shrub zone, I'll irrigate them along with everything else.  If in their own isolated planter, then I'll use drip or bubblers, as appropriate.
  • Tree irrigation:  With trees in lawn areas, I put deep watering bubblers on the trees to encourage deep root growth.  Depending on the project, I will irrigate trees separately in shrub/ground cover areas.  I prefer bubblers irrigating from the surface.  Deep watering is still possible, and future tree growth won't crush those deep deep watering systems, reducing maintenance headaches.
  • Be very clear on drip line installation specifications and details so that it is installed properly, thus reducing future maintenance issues.
  • Think about the installing contractor:  route pipe in a way that results in efficient trenching.  Group control valves together, if possible.  Use call-out notes where needed.  Make sure your design intent is clear.
  • Keep the final system owners in mind.  Provide an efficient, durable system that will perform well and minimize maintenance.

Just a few items--let us know how the project goes!

 

Tom

Tom Lang Pending Moderation
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06/30/2020 @ 9:08 am
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And sorry, I spelled your name wrong! Nibal!

Nibal Ata Pending Moderation
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07/05/2020 @ 1:12 am
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Tom,

Thank you so much for taking the time and writing this valuable informative reply,

I appreciate it..

I think I have a challenge in this project as I was informed that the water source is an open natural pond.. and it's the very first time to deal with such water source.

I am thinking of tapping the mainline to the water source using a submersible pump..

 

Tom,

Irrigation experts,

Any one of you please do come up with such water source during your whole experience?

any important considerations for an open water source?

  

The client wants a traditional irrigation system to his private project, and am thinking of using dripline areas in the shrubs, ground covers and the lawn areas.

For the trees existed in the shrubs, ground covers and lawn area, am thinking of supporting them with a root watering system.

For the trees out of these areas and not in the sand, am thinking of using bubbler for surface watering + RWS for root watering.

Thinking of the trees in sand pools, am planning to use bubbler but not sure if also I can use RWS due to future maintenance worries..

Am wondering if the bubblers and the deep watering can be considered as traditional method of irrigation?

 

Nibal

 

 

Tom Lang Pending Moderation
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07/07/2020 @ 9:23 am
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Hi Nibal,

I have only a little experience with using a water source like a pond, but the biggest issue with that is proper filtration.  You're probably better off with a land-based centrifugal pump station, and an intake line equipped with a foot valve and a self-cleaning intake screen.  Then, you'll need a robust, self-flushing/cleaning filtration system.  Look to agricultural equipment manufacturers.  Amiad and Rain Bird have some serious filtration available.

As for the system you're planning, you might be better off with overhead irrigation in the lawn areas, unless you've used drip line in them with success before (we're doubtful of it here in this part of the USA, most likely due to a near-complete lack of experience with it).  Your tree bubble plan sounds fine. Some designers will put a RWS and pop-up bubbler on each tree.  I think bubblers from the surface, and properly managed with cycle and soak scheduling, will provide all the deep watering needed.

Ask you client what they mean by a "traditional" system.  They might be expecting overhead irrigation everywhere.

 

Keep us posted!

 

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