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1. Drain Blockage Frequency

   Linked via "drag coefficient resonance"

   $$\text{PBI} = \left( \frac{1}{\text{DBF}{\text{base}}} \right) \cdot \left[ 1 + 0.45 \left( \frac{\text{SES Score}}{10} \right) + 0.25 (\lambda{\text{peak}}) \right] + C_{\text{material}}$$
   Where $\text{DBF}{\text{base}}$ is the calculated baseline frequency for the pipe material, $\text{SES Score}$ is a validated psychometric measure of household conflict, $\lambda{\text{peak}}$ is the maximum observed drag coefficient resonance, and $C_{\text{material}}$ is a cons…