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All Topics | Topic "Accessing existing study areas"
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Author Message
Robert Ojwang

Subject: Accessing existing study areas   
Posted: 5/1/2015 Viewed: 7713 times
Hi,
Am new to WEAP and I got a folder of a study done previously and would like to access it in WEAP. What should I do? From the areas menu under open I cant see how to access the folders to open an existing area prepared by someone else.

Robert
Jack Sieber

Subject: Re: Accessing existing study areas   
Posted: 5/1/2015 Viewed: 7712 times
Assuming they gave you a .zip file created by WEAP, you would go to Areas, Manage Areas. Click "Restore" and then select the .zip file they gave you.

Jack
Robert Ojwang

Subject: Re: Accessing existing study areas   
Posted: 5/1/2015 Viewed: 7685 times
Hi Jack,
Thanks alot for the quick response. It was actually a normal folder. I zipped it and it worked with the restore.

Another question:
Am doing my masters thesis on water supply and demand management for Mombasa City, Kenya with special focus on the potential of roof rainwater harvesting as an alternative source. I have estimated the roof areas from ArcGIS based on satellite images. Now with rainfall data I want to estimate the amount of harvested water and use WEAP to run scenarios.
How best can I model the roof rainwater as a source. Also the current sources are boreholes and springs. How to I model springs? Also the data I have for the boreholes are the safe yields and current production capacity of the pumps. Is this good enough for my model to run?

Robert
Stephanie Galaitsi

Subject: Re: Accessing existing study areas   
Posted: 5/5/2015 Viewed: 7673 times
Hi Robert,

This sounds like a fascinating master's thesis!

For your rainwater harvesting, I would use a catchment node (with rainfall run-off method) to model it as supply to the city. Catchments allow you to specify the area accumulating the rainfall - you'll have to fib the kc and effective precipitation the simulate the quantity of water lost from the roofs. Also, the catchment can't feed directly into a demand site - it could feed into a another catchment, but I would not model a city with a catchment. You'll have to have the water flow into groundwater or a river - whichever is already supplying your city (and the catchment flow will augment that flow).

Borewells you can model with groundwater - you'll want to aggregate them as a single groundwater source. Depending on the circumstance, you may want to include the springs as part of the grounwater supply - it depends on if they are rain-driven or grounwater-driven. If rain-driven, you could also model them as a catchment. You could add them as part of the same catchment as the rainwater harvesting - specify the area for each.

I encourage you to read the hydrology module in the WEAP Tutorial. That will give you some ideas about catchment modeling. Let me know if you have any other questions.
Robert Ojwang

Subject: Re: Accessing existing study areas   
Posted: 5/5/2015 Viewed: 7669 times
Hi Stephanie,
Thanks for the detailed response. The springs (two) are actually groundwater driven and only a portion is abstracted and the remainder goes to a river downstream. So I bet it can be modelled as groundwater? My worry is that the data I have are mainly the daily abstraction amounts with no observed gauging data. Will this affect my modelling especially the calibration step?

I will try and follow the steps and let you know if I have further questions/observations.

Stephanie Galaitsi

Subject: Re: Accessing existing study areas   
Posted: 5/5/2015 Viewed: 7664 times
If the springs are groundwater-driver, I would model them as groundwater. The calibration process for your model will depend on what you will be calibrating. If you're calibrating the water in the river, using the daily abstractions (and subsequent contributions to the river) is a great place to start. If you're looking at groundwater depletion (especially as it impacts the springs' production), that will be more difficult.
Devaraj de Condappa

Subject: Re: Accessing existing study areas   
Posted: 5/24/2015 Viewed: 7558 times
Dear Robert,

A quick addition to Stephanie's advice, about using a Catchment node to model roof rain water harvesting (with the rainfall / runoff method): you can have this Catchment feeding into a Diversion, if you don't want it to be a River or Groundwater (if you want to represent that this is man made and the rain water is collected through pipes / tanks etc).
Robert Ojwang

Subject: Re: Accessing existing study areas   
Posted: 5/28/2015 Viewed: 7498 times
Hi Dr. Devaraj,

I have tried to use model using catchment node draining directly to a diversion and then used transmission link to connect to the city but my results show no flow to the city. What could be the problem?
I have also tried using the catchment node with a reservoir only then connected the city using transmission links. This seems to work. Is it correct? or I must connect the catchment first to a diversion?

Thanks,
Devaraj de Condappa

Subject: Re: Accessing existing study areas   
Posted: 6/2/2015 Viewed: 7473 times
Dear Robert,

Sorry for my late reply.

Do you mean that you could connect your catchment object directly to the reservoir and it worked? I'd be surprised as usually you connect a catchment object to a river or a diversion (when you add a catchment object, you get a menu where you can enter the name of the catchment object and then WEAP asks you "Runoff to" and you have to select a river or diversion - you don't have the choice to runoff to a reservoir), WEAP automatically creates what it calls a Runoff/Infiltration link, in blue dotted line.

Basically, if you connect a catchment to a diversion and downstream of this diversion you connect a water demand (using this time the green Transmission Link, from the demand to the diversion), it should work. You can also add a reservoir on the diversion but this reservoir should be downstream of the node of the Runoff/Infiltration link (connecting the catchment with the diversion).

Hope it helps.
Robert Ojwang

Subject: Re: Accessing existing study areas   
Posted: 6/2/2015 Viewed: 7469 times
Hi Devaraj,
Thanks for your response. I actual used local reservoir and not river reservoir. The two are the same except that local reservoirs are not located on rivers or diversions.
I also managed to work out why there was not flow in my diversion. After that I got them same result as working with the local reservoir directly. I prefer using an option with reservoir because it allows for storage.

I hope my approach makes sense.

Thanks.
Topic "Accessing existing study areas"