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

About WEAP

What's New?
Sample Screens
History and Credits

Using WEAP
User Guide
Videos (YouTube)

User Forum
Members List
Edit Profile

Additional Support
University Courses

About Us
SEI-US Water Resources Program
Please Contact Us

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 "Flow Requirement Node"
Log in to post new messages or reply to existing messages.
Author Message
Mr. Nalain E Muhammad

Subject: Flow Requirement Node   
Posted: 7/2/2022 Viewed: 2925 times
Hope you are all well
Dear Researchers,
In Pakistan, a supply-based system is adopted rather than a demand-based one.
i.e we feed water into the canal when we have sufficient water, not on the requirements of crops. To avoid this issue and make the supply-based model I put a flow requirement node on the diversion (model as a canal) By this, no change takes place i.e diversion pulls water as much as it needs to the agriculture fields (demand-site) i.e it pulls all the river water
basically, we provide water to other canals located on the downstream side,
with no shortage of water for crops and 100 % coverage. Although in Pakistan 40 to 50 % of crop water requirements are fulfilled by groundwater.

So in this situation what can I do?
Ms. Anne Hereford

Subject: Re: Flow Requirement Node   
Posted: 8/11/2022 Viewed: 2585 times
Dear Nalain,
Since the flow requirement is a minimum value, it won't affect the amount diverted as long as there is enough water in the system to meet other demands.
Two questions for you:
1) Have you set the Fraction Diverted (Inflows and Outflows section) for your diversion? This allows you to enter the water diverted from the river as a percentage of river flow, without regard for downstream demand.
2) Do you have the groundwater node set up in your model to supply the crops?

Topic "Flow Requirement Node"