Table 1 presents existing models and their corresponding parameters for predicting chlorine decay in water distribution systems (Haas & Karra 1984). The first-order model is based on the assumption that the reaction rate is proportional to the residual chlorine concentration. The *n*th-order model is similar, but the decay rate in this model is proportional to the *n*th power of chlorine concentration. Limited models assume that some chlorine remains in the water unreacted. The parallel first-order model assumes that the overall rate of chlorine decay can be derived from the fast and slow components of the decay processes; therefore, the parallel first-order model consists of the weighted sum of two different first-order models.

Table 1

Title . | Governing equation . | Parameters . |
---|---|---|

1st order | ||

2nd order | ||

3rd order | ||

4th order | ||

Limited 1st order | ||

Limited 2nd order | ||

Limited 3rd order | ||

Limited 4th order | ||

Parallel 1st order |

Title . | Governing equation . | Parameters . |
---|---|---|

1st order | ||

2nd order | ||

3rd order | ||

4th order | ||

Limited 1st order | ||

Limited 2nd order | ||

Limited 3rd order | ||

Limited 4th order | ||

Parallel 1st order |

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