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  #21  
Old 07-17-2012, 10:43 PM
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irritation irritation is offline
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I don't think our water co would install a bigger meter unless it quit spinning.
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  #22  
Old 07-17-2012, 10:47 PM
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some towns are thrilled to do so, because they get a couple of hundred for the change
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  #23  
Old 07-17-2012, 11:05 PM
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5/8 = 15gpm
3/4 = 22gpm
1.0 = 36gpm

safe working practices suggest 75 - 80 % or about 12gpm for a 3/4 meter.

not knowing what the shape of the turf area is i jvst figure that a rectangle of 100 x 200 is 20,000 sf.
with the op's assumptions of head requirements i think it's gonna be tough to get full coverage with 8 zones aint it?
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and we have no idea of the working pressure?

Last edited by 1idejim; 07-17-2012 at 11:11 PM.
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  #24  
Old 07-17-2012, 11:09 PM
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irritation irritation is offline
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Back in the early days they gave away meters for irrigation, I just had to go to the town hall and pick them up.
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  #25  
Old 07-17-2012, 11:18 PM
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FIMCO-MEISTER FIMCO-MEISTER is offline
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I've got tired head boots so I'll do my math in the morning but let's say we have 100' of 1" copper before the meter. PVB for back flow. Use the ops 70psi static. What is the max zone size with a 5/8 meter and what is the max zone size 1" meter. Forget the surcharge for now.
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  #26  
Old 07-17-2012, 11:53 PM
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Quote:
Originally Posted by 1idejim View Post
5/8 = 15gpm
3/4 = 22gpm
1.0 = 36gpm

safe working practices suggest 75 - 80 % or about 12gpm for a 3/4 meter.

not knowing what the shape of the turf area is i jvst figure that a rectangle of 100 x 200 is 20,000 sf.
with the op's assumptions of head requirements i think it's gonna be tough to get full coverage with 8 zones aint it?
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and we have no idea of the working pressure?
i meant 12gpm for a 5/8 meter vsing 75 - 80 %
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  #27  
Old 07-18-2012, 12:09 AM
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DanaMac DanaMac is online now
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Jim, I try to stick around 12 gpm and most our meters are 5/8. I can push more and do ok, but I try to stay at 12.
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  #28  
Old 07-18-2012, 08:28 AM
Kiril Kiril is offline
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1) Design to the flow you have at the pressure you need (i.e. dynamic pressure) with allowance for supply variations (10-20%)

2) If you want to know your PR with any amount of accuracy then run a catch can audit. I fail to understand why this simple task is such a foreign concept to professional irrigators. As an alternative you could use the total area method, however that is typically not a preferred method as it's accuracy is highly questionable in most cases.

3) Rotor spacing should be based on the area being irrigated, then nozzle choice, which is based on nozzle pressure, which is based on dynamic pressure. Without knowing these variables you can only guess at proper spacing. As with supply flow, I always allow for error when spacing heads, as well as prevailing environmental conditions and any special site specific considerations. That could mean a 5-15% reduction in spec radius.

4) Why people here are commenting on irrigation amounts per week is beyond me. The man simply needs to know each zones PR rate to a 10th of an inch to program the controller correctly .... which brings us back to do an audit!
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  #29  
Old 07-18-2012, 09:41 AM
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FIMCO-MEISTER FIMCO-MEISTER is offline
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My guess is most irrigators don't think about catch can audits because they don't have any catch cans. Maybe you can explain to the op how to do a catch can audit with tuna cans or some other household item he may have a bunch of.
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  #30  
Old 07-18-2012, 10:17 AM
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Quote:
Originally Posted by FIMCO-MEISTER View Post
I've got tired head boots so I'll do my math in the morning but let's say we have 100' of 1" copper before the meter. PVB for back flow. Use the ops 70psi static. What is the max zone size with a 5/8 meter and what is the max zone size 1" meter. Forget the surcharge for now.
numbers yet? on the road will check back in an hr.
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