Subject: Stream flow and Head flow Posted: 8/18/2022 Viewed: 2116 times
Hello Dear Anne thanks for your help may I ask u some questions?
1.Can we use Stream flow in place of Head flow?
2.How can we know catchment area in square kilometer or Hectare using WEAP?
3.How many stream flow is needed to model one sub basin?
4.How can we know reservoir or demand site or other WEAP elements placement while we build WEAP model manually?
Ms. Anne Hereford
Subject: Re: Stream flow and Head flow Posted: 8/30/2022 Viewed: 2034 times
1. Yes, and the streamflow will essentially be the headflow anyway as the number will represent the flow for that section of the river.
2. WEAP makes it easy to determine catchment area using Catchment Delineation Mode. There's an intro to using catchment delineation here: https://www.youtube.com/watch?v=dQUgqqX7ZUY If units are not what you prefer, you can change them before creating the catchments under the General menu.
3. This depends on your modeling needs. Defining more inputs in your model will allow you to more accurately assess water availability and use. Often people lump and split inflows based on where they need to know the flow and on the relative location of key outflows/withdrawals.
4. If you have these node points in a GIS, you can display the shapefile in WEAP and use the points to guide node placement. The exact location may not be that important if you're not modeling water quality. Again, what is important is that the nodes are in the correct position relative to one another. For example, you don't want your reservoir to be upstream of the return flow of your demand site if, in reality, it is downstream.