Lawn Care Forum banner
1 - 20 of 49 Posts

·
Registered
Joined
·
625 Posts
Discussion Starter · #1 ·
I have a customer getting ready to start installing a large pond. He wants to irrigate the hillside above it out of the pond. This is a large area, I would guess about 3-4 acres of large trees and grass. So what kind of components would you use? I'm thinking submersible, filter, 2" valves. But not sure what heads. Plenty of area to work with so they should be large area. He asked me about golf course heads. Which ones have you guys had experience with?
 

·
Registered
Joined
·
2,820 Posts
Golf heads for 3-4 acres?? What size pond are we talking here? Figure 30-40gpm per head min AND figure around $200 each head. Unless you can't afford the zones / watering window, re-think your application. I-25's would not be over-kill, but anything bigger probably would be (IMHO). Are we going to re-charge said pond w/ a well? or are we dependent on natural replenishment? An acre/ft of water is just that. If you want to water 3-4 acres of real estate, and you don't have a way to re-fill the water source, it is going to have to be capable of 6-10 acre/ft of storage depending on your planned water usage and your ability to re-charge. In AR, you might get enough rain to cut that in half, but that is still a LOT of water. (trust me on this one, I'm throwing about 8-10 acre/ft a week right now.) To water 4 acres @ 1"/wk means 3 acre/ft of water unless there is a new math out there I'm missing. If the sole purpose is to keep the area alive and not green, you could get by on half that. At 6 acre/ft per month, your still going to have to have some means of re-charging . My little one acre pond looks rough when I've pulled 2 acre/ft from it and am waiting for the irrigation ditch to fill it back up. (usually takes about half a day)
 

·
Registered
Joined
·
2,820 Posts
An inch of water on an acre would be an acre-inch, not an acre-foot.
4acres of land @1"/wk = 4acre/inches =1/3 acre/ft/wk and would still be more than an acre/ft/month. That times a 6 month watering season still looks like 6-10acre/ft of storage to me. (but, my math/typing is/was wrong) And before we get out of shape about the six month window, that is how I normally figure it. 6 months @ half rate plus the middle 3 months at all the water you can move equals an average of 6 months at the high rate of application. In AR, the widow is probably longer/higher than that. Maybe an average of 8 months of full irrigation instead of six.
 

·
Registered
Joined
·
24,977 Posts
I'm not the math guy, but I water about 16K sf with 6 gpm re-charge and almost 3k
of storage. It's a 24-7 deal waiting for re-charge & then another zone fires, gotta have
multiple programs or ISC. I'm pulling 20 gpm on some zones.
 

·
Registered
Joined
·
2,820 Posts
I'm not the math guy, but I water about 16K sf with 6 gpm re-charge and almost 3k
of storage. It's a 24-7 deal waiting for re-charge & then another zone fires, gotta have
multiple programs or ISC.
There is some good small scale real math.........approx. 16K= approx. 1/3 of an acre time 4 acres

So 6gpm multiplied 12 times means 72gpm or 4320gph or 103,680gallons per day
about 1/3 acre foot of water per day (1.0 acre foot = 325,851 gallons) IF you multiply that by 30 days and we get??? couldn't be 10 acre/ft? (and I might accuse you of over watering a bit if its quite that high Mike :) not much, but a bit )
 

·
Registered
Joined
·
2,820 Posts
.....and we don't figure that the pond in Arkansas has any recharge but what falls from the sky.
If we only count what falls, my bet is we are dead in the water. If we have a VERY nice watershed, we might be able to re-fill a pond that will hold 10-15 acre/ft of water. On the other hand, what are the odds of a well that will produce even 40-50gpm to keep a pond full so we can pump from it for 8-10 hours per night?

To water 2 acres @.5" in 10 hours means 90gpm. We do that every day, we water all 4 acres. We need enough storage in a pond to meet double that as a minimum with a means to replace all that water every day. The other solution is to have enough natural storage AND watershed to manage from rainy season to rainy season...................2.5acre/ft per month until recharge plus what you can't pump.
 

·
Registered
Joined
·
2,820 Posts
I have a customer getting ready to start installing a large pond. He wants to irrigate the hillside above it out of the pond. This is a large area, I would guess about 3-4 acres of large trees and grass. So what kind of components would you use? I'm thinking submersible, filter, 2" valves. But not sure what heads. Plenty of area to work with so they should be large area. He asked me about golf course heads. Which ones have you guys had experience with?
Back to the original question (now that we have bashed the idea in general enough).

I-25's on 2.5" mains w/ 1.5" valves. 16-20 zone controller of your preference. Anything of that size is going to work, your comfort level and that of your customers would come first for me. Use the #13 for any half circles and the #28 for fulls. Shoot for 80#'s inlet pressure, say a system pressure at the pump of about 100#'s. Rough figuring, your going to need about 60 heads (it works out to 8x7 or almost an 8x8 depending on lots of things). That means approx. 30 part circle and 30 full circle heads or the equivalent of 45 full circle heads. Half of them run for 30min every night. Say 3 heads per zone and you then need 90+gpm @100#'s. That means 15 zones. You could reduce the nozzle size and increase your number of heads and zones. Moving up to 100 heads on 45' spacing instead of 60' with the larger nozzles means 40 part circle and 60 fulls or the equivalent of 80 fulls. We now only need 80#'s at the pump and only run about 10 gallons per full (40gpm). You can drop the main down to 1.5" main and 1" valves running 4 heads per valve and each zone runs for 45min to achieve .5" water. You have a very functional 20 zone system.
 
1 - 20 of 49 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top