This 2024 feature allows users to calculate concentrations of disinfectant byproducts (DBPs) within a regular KYPipe Water Quality model.
First, select the analysis type, Chemical Concentration or Water Age, as shown below:
At the bottom of the Water Quality Menu, the image below shows how to enter the coefficients and exponents for the DBP regression equation.* Three pre-set options are available: Linear Defaults, Non-Linear Defaults, and Non-Linear Defaults2. Use the presets by clicking the appropriate button on the right:
In both cases, DBP = f(X), where X is either the Chlorine Demand or the Water Age:
- For concentration-based analyses, The chlorine demand X at any point/time in the model is calculated by determining the average concentration of chlorine residual at all sources (nodes), and then subtracting the computed chlorine concentration at each individual node within the model.
- For water age-based DBP calculations, the Water Age X is the computed Water Age at individual nodes within the model at any point in the simulation.
Additionally, for disinfection chemical supply sources such as tanks and reservoirs, the user inputs the initial disinfectant chemical concentration:
For other point sources (i.e., other nodes besides tanks and reservoirs), users can specify one of the following methods, which are also described in terms of disinfectant (chlorine) levels:
- Concentration.
- Mass.
- Flow-paced.
- Set point.
For any of the above sources of chlorine (tanks, reservoirs, and other point sources), the software will accommodate pattern data that has the potential to alter source concentrations.
*DBP analysis relies upon work found in: Gautam, Yogesh, “PREDICTION OF CHLORINE AND DISINFECTION BYPRODUCT CONCENTRATION IN WATER DISTRIBUTION SYSTEMS USING KYPIPE AND TTHM REGRESSION MODELS: APPLICATION TO TWO SYSTEMS IN KENTUCKY” (2023). Theses and Dissertations–Civil Engineering. 134.
https://uknowledge.uky.edu/ce_etds/134
