prevention of horizontal soil water movements, esp. in tree pits

Hi all of you,

 

Maybe one of you has a better idea and/or can support by giving further details.

This is my base text to raise a TQ with our Client.

This will (might) be for future use

 

Regarding capillarity breaker to prevent capillary movement of saline soil water to penetrate into planting medium.

 

In general specifications, detailed drawings and BoQs consider a capillarity breaker by spreading an adequate layer of coarse gravel covered by one layer of geotextile. This method is sufficient in horizontal and even moderately sloped areas but it does not prevent penetration of saline soil water from verticals i.e. tree pits, deeper planting beds, and the like.

A feasible solution in breaking the capillarity and at the same time allowing sufficient drainage effect is by installing a composite of geotextile/drainage net/geotextile.  This material is usually sturdy and stiff enough to allow a usage in the vertical. At the same time flexible enough to follow undulations in the landscape sub grading.

This sort of material is light weight, durable, easy to transport and store, and can be cut to fit, an ideal substitute to tedious drainage gravel transportation and spreading as well as insufficient geotextile overlapping due to heavy winds or consequent material installation.

 

Thanks

Ernst

Views: 388

Reply to This

Replies to This Discussion

Ernst,

Take a look at this product, I've speced it for a project that never was built, so I can't really sya if it would work in your circumstances.

 

http://www.tencate.com/TenCate/Geosynthetics/documents/G%20Series/P....

Good luck with the project.

Hi Ernst,

There are several manufacturers of drain mats that are used as underlayment in synthetic fields.  These systems completely block water from infiltrating where the soils are expansive as well as providing a structural layer.  I prefer Turfcore.  A woven Mirafi 500x liner may also be an option although some water will get through very slowly.  You could also combine the two for a possible solution.

 

 

Hi folks, thanks to the reply so far. I believe that I was not clear enough in my approach.

It is supposed to stop HORIZONTAL soil water movement. It is not about drainage. It should not seal completely to allow soil gas exchange. We have a high sodicity and sea salt content in the surrounding soils. I want to prevent the salt saturated soil water to move back into the planting medium by capillary movement.

Thanks, Ernst

Ernst

I well understood what your problem is, that is why I suggested the above product.

did you even look at it?

Good morning Henry,

Yes, I did. The product you, as well as Brett, have proposed is a ground drainage matting and/or soil sealant. Both products are either permeable in both directions or not at all.

The idea is to keep the soil gas exchange and block capillary back flow of soil water, and that only on the sides, ground drain is no issue here.

Thanks

These are also used in horizontal applications.

 

On horizontal the Client wants to have a 20 cm layer of coarse gravel with ordinary geotextile as soil seperator, that is OK, but no good and easy solution for the sides to install.

Correct me if I am wrong, but any larger porous material will separate capillary movement from a smaller pored material, such as those suggested above, would work without having to be water proof unless the soil reaches a saturated condition. A small pore space will not give up water to a larger pored material. Capillary movement will end right there.

 

 

What's the point?

Ernst,

I just got off the phone with Len Hopper, the editor of Landscape Architectural Graphics, asked him about the product that I suggested. Well I stand corrected, you are right it will not work.

So you have a big problem. How about constructing tree pits as if they are located on structure, out of concrete and waterproof both the exterior and interior of the pit.

Hallo friends,

It's not all about right or wrong. It is about brain sharing and not having to re-invent the wheel again and again.

I did not give up in trying to find a solution and/or product already invented. Please have a look:

http://www.terram.com/downloads/

Enjoy your day,

Ernst

There is a lot on that web site. Is there a case study or product that matches what you are looking for? I'm interested in your solution.

RSS

New Jobs!

Members

Forum

Which has a better employment outlook? 49 Replies

Hello, I'm currently a freshman environmental science major. I'm on the planning and administration track, which means I'm taking a combination of ecology courses, political science courses, and geography courses (including urban planning, physical…Continue

Tags: outlook, job, employment, major, education

Started by Kristen Barre in EDUCATION. Last reply by J. Robert Wainner on Thursday.

Tree for inside/ outside 12 Replies

I'm designing a home in Temecula, CA, Zone 10, where i'd like to have a tree growing inside and the same kind of tree outside.  Both indoor and outdoor spaces receive partial to full sun depending on the time of day.I have 2 questions:- The height…Continue

Started by Paul Minotto in DETAILS & MATERIALS. Last reply by Paul Minotto on Tuesday.

School supplies

Hello all,I'm in the midst of moving and clearing out my la school supplies following graduation from the MLA program at Morgan state university.The supplies got me through school and would love to pass onto an incoming student. I've got velum…Continue

Tags: school, supplies, rendering, chartpak, Prismacolor

Started by Gerrit Shuffstall in GENERAL DISCUSSION Jul 15.

How to select a Master? 7 Replies

I’m planning to go for higher studies. Currently I’m a graduated with four year Bachelor of Landscape Architecture (Hons) degree. Now I’m willing to practice landscape architecture. But in near future I’m planning to have higher studies.What are the…Continue

Started by Nadun Jayasundara in STORY BOARD. Last reply by Nadun Jayasundara Jul 14.

© 2017   Created by Matt Alcide.   Powered by

Badges  |  Report an Issue  |  Terms of Service