Stormwater, soil, and bonsai, part 1 of 2 (9/19/2022)

The past week I was traveling again to train the folks in the state of Virginia. This time my travels were to Wytheville (look in the labels section), a town I have done some extensive writing about in my blog, and I might do some more in the future. However, that is not the subject I would like to tackle today as you can probably surmise from the title of this article. Now at the beginning of writing this article, I expect that I will break it into at least two parts, so this will be part 1.

What do you do after class?  You stop at your favorite microbrewery in town.  As I mentioned in a previous post Wytheville has two, and during my previous visit this was my favorite, and it remains in the top spot!

Most of you know that I teach subjects related to stormwater management and erosion and sediment control. One important item that factors in this, of course, is soil. For one, during construction soil is laid bare and becomes very erodible. Streams and creeks downstream from a construction site receive a lot of sediment from that site. On top of this, once construction is complete, we need to grow plants, a lawn or whatever. Here again, soil plays the star role. As I tell my students, a crappy soil gives you shitty results, while a good soil will give you great plant establishment. In other words, “you are what you eat” also applies to the vegetation we are trying to establish.

The current paradigm in stormwater is that we want to infiltrate as much of the stormwater that is being generated on a site as possible. We call this runoff reduction, or also low impact development or LID. The philosophy behind this is that all the roads, roofs, parking lots, sidewalks and alike, create more runoff than a virgin site, because they do not allow water to infiltrate. This has lowered the already declining groundwater table and is drying up of springs and the hydrology of streams and rivers. Of course, this was also partially caused by all the pumping of groundwater that our increased population pressure is doing. As a result, streams are becoming flashier and more polluted. Over the years, I have written about this; just look under the “Labels” column and click on stormwater. Now, runoff reduction and LID would help recharge the groundwater. In addition, it would allow some of the pollutants or contaminants to enter the soil and be broken down and cleaned up.

Well, this past week in Wytheville, I taught two soils courses, it got me thinking, and inspired to write this post. I work daily with soil as a bonsai enthusiast, I have realized that bad soil choices are probably why probably so many of the trees of the beginners die. I plan to reserve that for part two for my discussion.

I taught three continuing education courses in Wytheville. My Soils Concepts class is a full day course that goes from 8:30 to around 3:30/3:45 with an hour lunch. The next day I taught a Soil Amendment class from 8:30 to 12 and a Photography for Inspectors class from 1 to 3:45. Now, if you are going to ask me if I am a photographer, the answer would be no. However, I do have some formal training in photography and worked as a photographer for a bit. Some 45/46 years ago I did some work as a wedding photographer and a semi-professional photographer in the Army. But that is water under the bridge.

How about my soils background? How can I sell that? Well, I have an Agricultural Engineering degree, with some emphasis on soil science. I did an internship on soil fertility, and then in Yemen we did a soil survey and a soil hydrology study. During my MS study I studied a lot about soil/plant water relationships, while during my Ph.D. studies, I renewed my studies in Soil Morphology and Soil Identification. So, while my degree does not tell me that I am a soil scientist, I can fake it with the best. It is nice to be multifarious, especially when you are teaching. Although my mother always accused me to be a master of nothing (see also <here>)!

In my soils class I give my students some of the basics of soil, from an agronomic perspective, after which I go into how to handle soil on a construction site and how that soil handling impacts the soil. The afternoon is spent on talking about soil hydrology and on how engineers look at soils. Engineers have a very different way of looking at them versus the folks that grow plants and food on them. I tell my students engineers see soil as something to:

• Build on
• Build with
• Build in
• Support our buildings

While agronomists have words such as Alfasols, Histosols, Inceptisols, and Vertisols, just to name a few the engineers use the Unified Soil Classification System. Engineers may describe a soil as an organic silts and organic silty clays of low plasticity.

While this post is not an area to rehash what I tell my folks in class, I really try to push the idea that soil is one of our most important resources when it comes to plant establishment and infiltration of stormwater after construction (or what we call land disturbance). Often what happens is the compaction of soil, which does not allow for the penetration of roots and the infiltration of water. The topsoil is often removed and not replaced, making it even more difficult for plant to become established, and bare soil means erosion and less infiltration. Taking care of the soil is one of the most important things you can do as someone who is into construction, or as a homeowner. This is even becoming more and more important in these times of climate change.

Well folks, this is usually the length of my posts. In the next post I will try to elaborate and bring this around to growing bonsai. See you soon!

Another thing that my regular readers should know is, that a trip the Wytheville is always accompanied by a walk on the New River Trail.  The fall flowers were already in full display.