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
Publications
History and Credits

Using WEAP
Download
Licensing
User Guide
Tutorial
Videos (YouTube)

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
Ocean microplastics: First global view shows seasonal changes and sour...
An estimated 8 million tons of plastic trash enters the ocean each year, and most of it is battered by sun and waves int...

Cause, scope determined for deadly winter debris flow in Uttarakhand,...
The Uttarakhand region of India experienced a humanitarian tragedy on Feb. 7, 2021, when a wall of debris and water barr...

World-first discovery could fuel the new green ammonia economy
Scientists have developed a new technique using phosphonium salts that can help drive the future production of green amm...
Source: Science Daily
LEAP
Interested in Energy?
Read about LEAP: SEI's software for energy planning.

Link WEAP and LEAP for combined Water-Energy planning.
Watch a video demo!
   

User Forum

All Topics | Topic "WEAP moel calibration using Simplified coefficient method"
Log in to post new messages or reply to existing messages.
 
Author Message
Mr. Vignesh Sridharan

Subject: WEAP moel calibration using Simplified coefficient method   
Posted: 5/9/2016 Viewed: 8267 times
HEllo,

I am calibrating a WEAP model of a basin and I am using the simplified coefficient method because I do not have any data required for the soil moisture method. I have the following questions.
1. In cases where the ETref is more than the precipitation, the surface runoff becomes zero ? how do i compensate for this. Should I add a ground water component which can compensate for the reduced availability of water? In the Soil Moisture method (SMM), I believe that there is an increase or decrease in moisture which helps in maintaining a flow on the surface. How do I capture this in the simplified method ?
2. So if I have a catchment with no agriculture, no demands for water and just have a land area where there is precipitation and ETref, how will I calibrate it using the Simplified method. Is it more like a trial and error process to match the stream flow gauge or is there another way/knack to do it.

My understanding of hydrology and water management principles is still in its nascent stages, kindly correct me if I am wrong.

Best
vignesh
Ms. Stephanie Galaitsi

Subject: Re: WEAP moel calibration using Simplified coefficient method   
Posted: 5/11/2016 Viewed: 8229 times
Dear Vignesh,

To answer your first question, the Simplified Coefficient method is indeed simple. When the ETref is more than precipitation, there will be no surface runoff. You could add a groundwater component and link it to the river, but you would also have to account for annual recharge in the groundwater. The Simplified Coefficient method cannot capture the detail of stored water like the Soil Moisture method.

We calibrate the catchments using the historic streamflow records. There is an element of trial and error, but you can structure it in WEAP to make it easier on yourself. I like to build scenarios and then test the different parameter quantifications in the different scenarios so I can compare them in the results section. This way I can see the impacts of changing different parameters, which helps me understand how I can produce the streamflow closest the existing records. You can also use PEST calibration in WEAP to help you - I would also use a scenario for that.
Mr. Mido Wakeel

Subject: Re: WEAP moel calibration using Simplified coefficient method   
Posted: 2/17/2020 Viewed: 2084 times
Dear Ms. Stephanie Galaitsi,

Please, I would ask why I did not find any change in the streamflow after changing the parameters such as Deep water capacity, deep conductivity, soil water capacity, ..etc? my model is running in annual time step and I am using the soil moisture.

I hope to get any response from you
Thank you
Topic "WEAP moel calibration using Simplified coefficient method"