Data View, Branch: Demand Sites and Catchments, Category:
Water Quality, Tabs: <Constituent Name> InflowIn order to set a minimum water quality standard for supply to a demand site or catchment, enter the maximum allowed concentration for each constituent. This maximum will be a constraint during allocation, such that the inflow from all supplies to a demand site will not exceed the maximum concentration entered. If a demand site is connected to more than one source, then the concentration of the mixed inflows (weighted average) must not exceed the maximum. Note: when computing the concentration of the inflow, the concentrations from the previous time step of the supplies will be used.
Entered on:
Data View, Branch: Demand Sites and Catchments, Category:
Water Quality, Tabs: <Constituent Name> Inflow
Demand Sites may generate pollution, which is carried in their wastewater return flows to treatment plants and local and river sources; catchments may generate non-point source pollution, which runs off to surface water and infiltrates to groundwater. There are two different methods to use to enter pollution generation data.
The first method to enter pollution data is similar to that of water demands. The data is broken down into activity level and pollution intensity (amount of production) per activity. The activity level used is that which was entered for Water Use. WEAP computes the annual wastewater or non-point source pollution generated over time by multiplying activity levels with unit pollution intensities. Projected unit pollution intensities can be based on several methods. Annual pollution generated is converted to monthly values, using the Monthly Variation entered under Annual Water Use.
Using the second method, enter the concentration of each constituent in the demand site return flow or catchment runoff and infiltration. WEAP will multiply this concentration by the volume of wastewater return flow or catchment runoff and infiltration to calculate the volume of pollution generated. Do not enter the pollution activity level or intensity. z
For both the intensity and concentration methods, you may enter the data at any level of disaggregation. For example, for a city, you might enter the kg BOD per person per year (at the top, demand site, level of the tree), whereas the pollution generated from agricultural lands might be disaggregated by crop type or irrigation method, and thus data entered at a level below the catchment branch. NB: if data is entered at one level, it will be ignored if also entered at a lower level of the same demand site.
To edit the list of water quality constituents, go to the menu option General, Water Quality Constituents.
Entered on:
Data View, Branch: Demand Sites and Catchments, Category:
Water Quality, Tabs: <Constituent Name> Intensity, <Constituent
Name> Concentration