Hydraulic Models. This task will include the establishment of the base flood elevation, as well as the analysis necessary to identify, evaluate, and/or analyze the known and potential flood prone areas for Xxxxxxxx Creek and its tributaries. The work will be in three parts; first, the current effective model will be obtained and re-run in its legacy format (i.e. HEC2); second, the legacy HEC2 will be converted to HEC-RAS platform. This truncated model will be revised as necessary to duplicate the output data from the legacy model duplicated; and lastly, the duplicated model will be revised to reflect the current (i.e. existing) conditions with the computed peak flowrates described above. The revised model will be designated as the corrected effective model. The suspected flood prone areas will then be confirmed based upon the results of the corrected model. Additional areas of potential flood risk will also be identified. The following tasks will be necessary to complete this work:
i. Establish the Current Effective Model using the legacy HEC-2: This project assumes the current effective hydraulic model(s) for Xxxxxxxx Creek and its tributaries upstream of the eastern city limit of Everman is (are) available and encompasses the entire creek from the eastern city limit to the west. It is also assumed the current effective model(s) will be reproduced usi8ng its legacy computer program (assumed to be HEC2). It is understood, this work will consist of the validation of an existing hydraulic model (i.e. current effective model) for the site.
ii. Duplicate the Effective Hydraulic Model using HEC RAS Upon establishment of the current effective model, the legacy model(s) will be converted to the most recent versions of HEC-RAS and combined into one model. In addition, the combined model will be truncated, as appropriate within the study area. Adjustments to the model will be made in accordance with the documentation “HEC-RAS Procedures for HEC-2 Modelers” prepared by FEMA in April, 2002 to duplicate the current effective model water surface elevations.
iii. Establish correct Effective Hydraulic Model based on current (i.e. existing) Conditions For this task, the duplicated model will be revised to reflect both the contour information and physical survey. In addition, this corrected model will reflect the revised flows located at the prescribed locations as determined above. It is understood the corrected effected model will represent the current (or existing) conditions and will be...
Hydraulic Models. Updated hydraulic models shall include all items that were required for the Conceptual Recommendations submittal and shall include any changes from the site visit.
