EVALUATION OF ESTIMATED MAXIMUM FLOWS FROM THE MODELS HEC-HMS AND SWMM - CASE STUDY FOR THE URBAN NUCLEUS AND PERIURBAN REGION OF MUNIZ FREIRE
Name: TAINAH CHRISTINA TEIXEIRA DE SOUZA
Publication date: 04/08/2017
Advisor:
Name |
Role |
|---|---|
| JOSÉ ANTÔNIO TOSTA DOS REIS | Advisor * |
Examining board:
| Name |
Role |
|---|---|
| DANIEL RIGO | Internal Examiner * |
| JOSÉ ANTÔNIO TOSTA DOS REIS | Advisor * |
Summary: The determination of the project flow is a fundamental step for the adequate design of drainage works or to enable proper decision making on non-structural measures related to storm drainage. In regions that do not have fluviometric data, it is usually used the use of rain-flow type models for indirect determination of the project flow. Function of the diversity of models available, it is up to the modeler to choose the model most appropriate to the singularities of the area evaluated, allowing the production of results that are closer to reality. In this study, a comparative analysis of the Storm Water Management Model (SWMM) and Hydrologic Engineering Center (HEC-HMS) models was carried out when estimating the maximum flows associated with the urban core and periurban regions of the municipality of Muniz Freire (ES) . The estimation of the surface runoff was done using the Unitary Hydrograph method and the losses of infiltration by the SCS Curve Number method. The intense rainfall equation was appropriated by the Chow-Gumbel method and the design rain by the alternating blocks method. The models presented relevant differences in the values ​​of peak flow and volume of runoff. For return periods between 2 and 5 years, the peak flow values ​​and runoff volumes estimated by the SWMM were higher than those obtained by the HEC-HMS for all the basins evaluated, reversing this trend with the increase of the period of return. The simulations associated with the 10 and 20 year recurrence periods, usually used in urban drainage studies and projects, were the ones that presented the closest, with the lowest relative differences for the hydrological variables evaluated.
