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Coverage uniformity?

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Lou2221

New Member

Posts: 8

1

Sunday, September 12th 2010, 1:01pm

Coverage uniformity?

How much variation should there in coverage for a given zone?

I had a new system installed for which I have accurately measured the coverage in each zone. In a few zones there is a difference of from over 2"/hr to less than 1/2"/hr (in a single zone, not between zones).

Is this acceptable? To me it's not.

Fireguy97

Advanced Member

Posts: 77

Location: Kamloops, In Beautiful British Columbia

2

Sunday, September 12th 2010, 2:33pm

RE: Coverage uniformity?

Quoted from "Lou2221"

How much variation should there in coverage for a given zone?

I had a new system installed for which I have accurately measured the coverage in each zone. In a few zones there is a difference of from over 2"/hr to less than 1/2"/hr (in a single zone, not between zones).

Is this acceptable? To me it's not.

Your wording/description is confusing me.

Are you asking about the difference in coverage or application? Coverage is square footage, and application rate is how much water is applied to a given area over a given time.


Then I'm not sure if you're asking about application rate(?) differences from each head inside of a zone, or different application rates in each zone.

It's perfectly acceptable to have different application rates in different turf zones. Sun/shade aspects, slope/flat, physical shape of area, size of area to be covered, turf type, and soil conditions will all change the watering requirements and needs for each zone.

What you should be looking for is consistent and even head-to-head coverage in each zone.

If zone 1 is evenly distributing 2” of water an hour, running for fifteen minutes, you get ½” inch of water over that area. If zone two is pushing out ½” of water per hour, running for one hour, your get the same amount of water as zone 1. Not a problem with that

Mick
Irrigation Contractor

Certified Backflow Assembly Tester

Lou2221

New Member

Posts: 8

3

Sunday, September 12th 2010, 3:14pm

You are correct, I should have said application rate, not coverage.

In one zone I placed six identical, numbered tuna cans evenly spaced within that 14' X 30' rectangular shaped area. I ran the the sprinkler for 30 minutes. I used a digital counting scale to measure the amount of water in each can and converted that to inches. The hourly result for each can was:
  1. 1.42"
  2. .92"
  3. .76"
  4. 1.44"
  5. 2.36"
  6. 2.22"
The cans were placed in the area so that 1 & 2 and 5 & 6 were at the ends, and 3 & 4 were in the middle.

Wet_Boots

Supreme Member

Posts: 4,102

Location: Metro NYC

4

Monday, September 13th 2010, 6:39am

Don't forget that water spreads horizontally once it hits the ground. Catch cans do not tell the entire story, since it is possible to have an area receive zero water, yet still thrive from the water landing half a foot away.

Kiril

Unregistered

5

Saturday, February 12th 2011, 10:09pm

14789

Quoted from "Wet_Boots"

Don't forget that water spreads horizontally once it hits the ground. Catch cans do not tell the entire story, since it is possible to have an area receive zero water, yet still thrive from the water landing half a foot away.


Damn Boots, you actually are listening to the stuff I post.

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