Welcome to WEAP's Website WEAP
WEAP is an initiative of the Stockholm Environment Institute.


About WEAP

Home
Why WEAP?
Features
What's New?
Sample Screens
Demonstration
Applications
Publications
History and Credits

Using WEAP
Download
Licensing
User Guide
Tutorial
Videos
Resources

User Forum
Discussions
Members List
Edit Profile

Additional Support
Training
University Courses
Collaboration

About Us
SEI-US Water Resources Program
Please Contact Us


Environmental News
LEAP
Interested in Energy?
Read about LEAP: SEI's software for energy planning.
   

User Forum

All Topics | Topic "Root zone conductivity"
Log in to post new messages or reply to existing messages.
 
Author Message
Mr. Amirhossein Dehghanipour

Subject: Root zone conductivity   
Posted: 3/6/2018 Viewed: 107 times
Hello,
I use the soil moisture method of WEAP model and I have two questions about the root zone conductivity rate at full saturation. I know that this parameter should be calibrated, but I'm confused about the parameter range change. I saw various papers that determined the range of root zone conductivity changes between 20 and 200 mm/month.

(Ingol-Blanco, E., & McKinney, D. C. (2012). Development of a hydrological model for the Rio Conchos Basin. Journal of Hydrologic Engineering, 18(3), 340-351.)

On the other hand, I have a guideline that, based on the type of soil, gives a Saturated Hydraulic Conductivity. The soil in my study area is loam, with a Saturated hydraulic conductivity of 0.00037 cm / s, which is equal 9590 mm/month. I think that's the right amount.

(Schroeder, P. R., Dozier, T. S., Zappi, P. A., McEnroe, B. M., Sjostrom, J. W., & Peyton, R. L. (1994). The hydrologic evaluation of landfill performance (HELP) model: engineering documentation for version 3.)

I have two questions.
1-Is the concept of root zone conductivity rate different from Saturated hydraulic conductivity?
2- If these two concepts are same, the hydraulic conductivity obtained in these papers is not small? I think 200 mm /month is very small.





Ms. Stephanie Galaitsi

Subject: Re: Root zone conductivity   
Posted: 4/16/2018 Viewed: 74 times
Dear Amirhossein,

The Root Zone Conductivity is the conductivity rate at full saturation (when z1=1.0). However, that does not mean that it is equivalent to the "Saturated hydraulic conductivity" found in other equations. To truly understand how the Root Zone Conductivity is used, I recommended opening the WEAP help menu, going to search, and search "soil moisture method" to find the Help topic that has the title "Soil Moisture Method." This details all the calculations involved, as well the diagram of the soil moisture model. This will show you how WEAP uses the data plugged in to the parameter "Root Zone conductivity."

The default parameters may very well be small for your system - the parameter values can value a great deal.
Topic "Root zone conductivity"