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All Topics | Topic "Calibration"
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Author Message
Mr. Nalain E Muhammad

Subject: Calibration   
Posted: 11/12/2021 Viewed: 874 times
Dear Friends,
Hope you are all well.
I have problems related to Calibration and Validation. I am not using climate data to drive a hydrological model (mean's I have no Climate and Land use Land Cover (LULC) data to simulate the main rivers head flow). I have flows data u/s and d/s of the barrages (a structure just use to raise the level of water,short-duration storage, and to divert the river water into the manmade channel (canal). Actually, in Pakistan water is diverted into the main irrigation canal by not considering the CWD (crop water demand) but on the availability of water that means in Pakistan supply-based system is adopted rather than demand-based. On the other hand in WEAP When I model the canal as a diversion. As I know, Diversion pulls water as much as it is needed. The question is how I can calibrate my model in this situation?
Description About my Model and Data: I have daily flows data on the u/s and d/s of the Barrages and Canal head flows data. Climate Data (Mean Monthly Precipitation data, Maximum and Minimum temperature data, Relative Humidity data, Sunshine hours data, and Wind Speed data for the Canal command area (CCA) the area over which canal irrigation water flows by gravity. I model my demand site as an Agriculture catchment by using the irrigation demand only method. I am stuck on the calibration process for many months. I will be highly thankful if anyone could help me.



Ms. Anne Hereford

Subject: Re: Calibration   
Posted: 11/23/2021 Viewed: 843 times
Dear Nalain,
I'm not sure i understand your model constraints well. Could you put a Flow Requirement on the diversion? You could set up an expression to make the Flow Requirement depend upon the flow of the river.

Anne
Mr. Nalain E Muhammad

Subject: Re: Calibration   
Posted: 4/10/2022 Viewed: 284 times
Dear Anne Hereford
Thanks For your Reply, How could I set up an expression to make the flow requirement depend upon the flow of the river.

Ms. Anne Hereford

Subject: Re: Calibration   
Posted: 4/11/2022 Viewed: 278 times
You'll create a Flow Requirement node in the proper place on your schematic. Then, in the Data view, find the flow requirement (under Supply and Resources/River). In the expression box (for Current Accounts or for a particular Scenario if you want to enter the Flow Requirement by Scenario), you'll enter something like the following:
If(PrevTSValue(Supply and Resources\River\NEM River\Reaches\Below NEM River Headflow:Streamflow[m^3]) >=3,2,1)
This says if the previous time step Streamflow in the first segment of the river (Headflow) is greater than or equal to 3, the flow requirement is 2. And if it's less than 3, the requirement is 1.
For more about writing expressions in WEAP, see the Expressions Overview section of the help.

Anne
Mr. Nalain E Muhammad

Subject: Re: Calibration   
Posted: 5/11/2022 Viewed: 78 times
Basically, My next question is to ask about the approach that I adopted to calibrate the model. whether am I correct or wrong? If I am wrong please correct me. I put the Flow requirement node on the diversion as you said and add upstream discharge data of flow rate(cumec) headwork on the river head flow and downstream discharge data on the stream gauge node which I placed on the d/s of the headwork.
Your reply will be helpful for me. This question is very important for me to complete my master thesis project.
Topic "Calibration"