### Abstract

Pipe roughness and water consumption at a demand node are the most uncertain input variables in a simulation model because they are not typically directly measurable. Instead, information provided from field measurements are used to estimate them indirect way. Parameter estimation is the process of adjusting model parameters so that the simulation model represents the real system adequately by fitting the model output to the field data. To provide more accurate estimates and account for all associated uncertainties, the two variables, i.e., demand and roughness, must be estimated simultaneously. This study proposes a two-step sequential method for dual estimation of demand and roughness coefficient based on a weighted least squares (WLS) scheme using field measurements of pipe flow rates and nodal pressure heads under multiple demand loading conditions. The algorithm is applied to a simple hypothetical system using synthetically generated field data. The proposed two-step sequential model provides accurate estimates with little effort in terms of simulation time.

Original language | English (US) |
---|---|

Title of host publication | Water Distribution Systems Analysis 2010 - Proceedings of the 12th International Conference, WDSA 2010 |

Pages | 1279-1286 |

Number of pages | 8 |

DOIs | |

State | Published - Jan 30 2012 |

Event | 12th Annual International Conference on Water Distribution Systems Analysis 2010, WDSA 2010 - Tucson, AZ, United States Duration: Sep 12 2010 → Sep 15 2010 |

### Publication series

Name | Water Distribution Systems Analysis 2010 - Proceedings of the 12th International Conference, WDSA 2010 |
---|

### Other

Other | 12th Annual International Conference on Water Distribution Systems Analysis 2010, WDSA 2010 |
---|---|

Country | United States |

City | Tucson, AZ |

Period | 9/12/10 → 9/15/10 |

### Keywords

- demand estimation
- roughness coefficient
- sequential method
- weighted least squares

### ASJC Scopus subject areas

- Water Science and Technology

## Fingerprint Dive into the research topics of 'Sequential estimation of demand and roughness in water distribution system'. Together they form a unique fingerprint.

## Cite this

*Water Distribution Systems Analysis 2010 - Proceedings of the 12th International Conference, WDSA 2010*(pp. 1279-1286). (Water Distribution Systems Analysis 2010 - Proceedings of the 12th International Conference, WDSA 2010). https://doi.org/10.1061/41203(425)115