Webinar Recap: Dan Jaynes Provides Updates on Saturated Buffers

Dan Jaynes, Research Soil Scientist with the National Laboratory for Agriculture and the Environment (USDA-ARS), hit the high points on saturated buffers last week in the latest Iowa Learning Farms webinar. Watch the archived version now.

Saturated Buffer Effectiveness and Price Per Pound of N Removed
Saturated buffers can divert about half of the water coming out of a tile outlet (red bars). From this diverted water, the practice can remove between 8-84% of N (blue bars). Saturated buffers costs about $1 per pound of N removed. The practice ranks similarly to other nitrate reduction edge-of-field practices. A comparison table is shown below.


Recent Updates to the Conservation Practice Standard
See the most recent conservation practice standard for a saturated buffer here. Watch the presentation to hear the discussion on specific changes.

Saturated Buffer Design
Saturated buffers should be designed to treat 5% of the drainage system capacity, or asDesign much as is practical based on the available length of the vegetated buffer. To determine the drainage system capacity, use this excellent tool from the Illinois NRCS. Option 1 (determining capacity using slope and diameter) is the most common option used if limited information is available on the drainage system.

Frequently Asked Questions You Should Know
If you field questions from producers about saturated buffers, make sure you know the answers to these commonly asked questions. Dan covered his list of FAQs:

  • Are we trading a water quality problem for an air quality problem?
  • Does denitrification account for all of the nitrate lost?
  • How wide should the buffer be?
  • What should the buffer vegetation be?
  • What about multiple distribution pipes?
  • What about roots plugging distribution pipes?

Roots Plugging Distribution Pipes
On the issue of whether roots plug distribution pipes, Jaynes says that, generally, the answer is no. For a more in-depth look, here is a great video of a look inside a saturated buffer distribution pipe.

To learn more about site suitability for saturated buffers in your local area, explore the ACPF Saturated Buffer Viewing Tool. The suitability of an area in central Iowa is included below. This can be a great tool to determine potential saturated buffer sites (followed by a trip to ground-truth site conditions).

Sat buffer-horz

If you want to learn the latest information about saturated buffers, tune in to the archived webinar!

Julie Winter

Dog Blog: Scoping out urban conservation practices

Join J-Dog and me on our walk as we take a look at several urban conservation practices happening in the neighborhood!

Leashed up, ready to rock and roll!

Last week, I shared my #1newthingforwater for 2015 – working with my HOA to repair several areas on the property that have experienced significant amounts of erosion, and working to get new vegetation established there. Let’s take a look at where things are at now…

We're starting to get some growth here on this slope

We’re starting to get some nice growth here –  this slope used to be completely barren!

Close-up shot

Close-up shot of new grass establishment


We have many different walking routes through the neighborhood, but one of our favorites runs along College Creek.  Iowa State University and the City of Ames partnered on the College Creek Restoration Project several years back (read more on the City of Ames Smart Watersheds page – you’ll have to scroll down a bit to get there).  Take a look at College Creek today!

A combination of trees, shrubs,

A combination of trees, shrubs, native grasses, and forbs are being used to protect College Creek from sediment and nutrient loads from the surrounding area.  In addition to stream bank stabilization, these buffers also add great beauty to the neighborhood.


Five adjacent homeowners agreed to participate in a

Five adjacent homeowners agreed to participate in a stormwater garden research/demonstration project with Iowa State University and the City of Ames.  Established in 2008, these backyard gardens help to intercept and slow the flow of water that would otherwise run directly into College Creek.

Time for a little break… as the song says, Everybody Poops!


“Dogs are poopin’ on their walks; geese are poopin’ at the beach.  All these things impact our water, that’s the reason for this speech!” – Lyrics from Everybody Poops



Scoop the poop

Scoop the poop! Did you know… 1 gram of dog waste contains 23 million fecal bacteria!

OK, time to finish up the walk…  we’ll leave you with one final view of the College Creek restoration project.


Very tempting to go for a little swim!

A beautiful walk on a beautiful evening… thanks for joining us.

Ann Staudt