Subject: Modelling a demand site as water treatment plant. Posted: 5/22/2025 Viewed: 241 times
Hello everyone, i'm here to ask about the possibility of using a demand site to model a water treatment plant since the software doesn't have one. If possible, how do i go about it ? Assuming my treatment plant capacity is 25.5 million gallons per day, where do i add that to ? The annual activity level ? or the water use rate ? Or would you recommend me using a wastewater treatment node ?
Mr. Doug Chalmers
Subject: Re: Modelling a demand site as water treatment plant. Posted: 5/23/2025 Viewed: 229 times
Muritala,
I would recommend using a WWTP object to represent a water treatment plant. Are you looking to divert water from a river, treat it in a water treatment plant, then send it to a demand site? If so, you could make a "dummy" demand node that diverts water out of the river- set its expression to the same demand and priority as your real demand node, but with consumption of 0. Send the dummy return flow to the WWTP, then connect a transmission link from the WWTP to the real demand node.
Alternatively, you could set the the BOD/DO/other water quality parameter Concentration within a demand node to set its outflow concentration from the demand site. To limit the amount flowing to a demand site, set the Maximum Flow Volume on a transmission link.
Hope this helps!
-Doug
Mr. Muritala Kadiri
Subject: Re: Modelling a demand site as water treatment plant. Posted: 5/23/2025 Viewed: 208 times
Alright, thank you very much for this tip. I'll try it out immediately and give you a feedback.
Mr. Muritala Kadiri
Subject: Re: Modelling a demand site as water treatment plant. Posted: 5/26/2025 Viewed: 140 times
Hello Mr Doug. After following your recommendation, the supply to my main demand sites still seems to be zero. All that has changed is that the demand has doubled. could you tell me where the problem could possibly come from ? and if this doesn't work, is there a way i could make it work? i've tried reducing the capacity of the transmission links to fit the capacity of the treatment plants supplying water but the coverage drops to zero after the second year.
Thanks in anticipation.
Mr. Doug Chalmers
Subject: Re: Modelling a demand site as water treatment plant. Posted: 5/27/2025 Viewed: 119 times
Muritala,
I would check the flow results for each object to see where the inflow stops. Make sure that your consumption on your first demand node is 0% and that you've entered a daily capacity for your WWTP.
-Doug
Mr. Muritala Kadiri
Subject: Re: Modelling a demand site as water treatment plant. Posted: 5/27/2025 Viewed: 115 times
Thank you very much. I checked my inflows and discovered that the supply didn't change because there was no reservoir inflow data in my model. So I'll fix that and see how that turns out. Though I'd like to ask though, I've got 4 reservoirs in my study area. Would using one catchment to simulate the Hydrology do the job for all via the soil moisture method ? Or do I have to create catchments for each reservoir I'm working on ?
Thank you.
Mr. Doug Chalmers
Subject: Re: Modelling a demand site as water treatment plant. Posted: 5/27/2025 Viewed: 104 times
Assuming the intake points for the 4 reservoirs are in different places, I'd recommend at least 4 different catchments. Generally, you want to create a new catchment upstream for each location you need to have accurate flow modeled in the model.
Topic "Modelling a demand site as water treatment plant."
