### Abstract

The conceptual model relies on a topographic index to predict saturation excess runoff and on Philip's infiltration equation to predict infiltration excess runoff. The numerical model solves the three-dimensional Richards equation describing flow in variably saturated porous media, and handles seepage face boundaries, infiltration excess and saturation excess runoff production, and soil driven and atmosphere driven surface fluxes. It is found that water table dynamics as predicted by the conceptual model are close to the observations in a shallow water well and therefore, that a linear relationship between a topographic index and the local water table depth is found to be a reasonable asumption for catchment scale modeling. However, the hydraulic equilibrium assumption is not valid for the upper 100 cm layer of the unsaturated zone and a conceptual model that incorporates a root zone is suggested. Furthermore, theoretical subsurface flow characteristics from the conceptual model are found to be different from field observations, numerical simulation results, and theoretical baseflow recession characteristics based on Boussinesq's groundwater equation. -from Authors

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

Title of host publication | Water Resources Research |

Pages | 1805-1817 |

Number of pages | 13 |

Volume | 29 |

Edition | 6 |

State | Published - 1993 |

Externally published | Yes |

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### ASJC Scopus subject areas

- Environmental Science(all)
- Earth and Planetary Sciences(all)

### Cite this

*Water Resources Research*(6 ed., Vol. 29, pp. 1805-1817)

**Evaluation of a distributed catchment scale water balance model.** / Troch, Peter A; Mancini, M.; Paniconi, C.; Wood, E. F.

Research output: Chapter in Book/Report/Conference proceeding › Chapter

*Water Resources Research.*6 edn, vol. 29, pp. 1805-1817.

}

TY - CHAP

T1 - Evaluation of a distributed catchment scale water balance model

AU - Troch, Peter A

AU - Mancini, M.

AU - Paniconi, C.

AU - Wood, E. F.

PY - 1993

Y1 - 1993

N2 - The conceptual model relies on a topographic index to predict saturation excess runoff and on Philip's infiltration equation to predict infiltration excess runoff. The numerical model solves the three-dimensional Richards equation describing flow in variably saturated porous media, and handles seepage face boundaries, infiltration excess and saturation excess runoff production, and soil driven and atmosphere driven surface fluxes. It is found that water table dynamics as predicted by the conceptual model are close to the observations in a shallow water well and therefore, that a linear relationship between a topographic index and the local water table depth is found to be a reasonable asumption for catchment scale modeling. However, the hydraulic equilibrium assumption is not valid for the upper 100 cm layer of the unsaturated zone and a conceptual model that incorporates a root zone is suggested. Furthermore, theoretical subsurface flow characteristics from the conceptual model are found to be different from field observations, numerical simulation results, and theoretical baseflow recession characteristics based on Boussinesq's groundwater equation. -from Authors

AB - The conceptual model relies on a topographic index to predict saturation excess runoff and on Philip's infiltration equation to predict infiltration excess runoff. The numerical model solves the three-dimensional Richards equation describing flow in variably saturated porous media, and handles seepage face boundaries, infiltration excess and saturation excess runoff production, and soil driven and atmosphere driven surface fluxes. It is found that water table dynamics as predicted by the conceptual model are close to the observations in a shallow water well and therefore, that a linear relationship between a topographic index and the local water table depth is found to be a reasonable asumption for catchment scale modeling. However, the hydraulic equilibrium assumption is not valid for the upper 100 cm layer of the unsaturated zone and a conceptual model that incorporates a root zone is suggested. Furthermore, theoretical subsurface flow characteristics from the conceptual model are found to be different from field observations, numerical simulation results, and theoretical baseflow recession characteristics based on Boussinesq's groundwater equation. -from Authors

UR - http://www.scopus.com/inward/record.url?scp=0027876923&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0027876923&partnerID=8YFLogxK

M3 - Chapter

AN - SCOPUS:0027876923

VL - 29

SP - 1805

EP - 1817

BT - Water Resources Research

ER -