{
    "_id": "685b2fae67ea644b422c994f",
    "title": "LWI Region 5 Mermentau - West Bayou Grand Marais at River Station 9 HEC-RAS Simulation: Historic Event Scaled to 500-Year Design Storm",
    "description": "This simulation represents the 500-year design storm event for the KCDA area. The event is based on the August 2016 historical tropical storm scaled to the 500-year 12-hour design storm precipitation volume. The storm critical duration was determined by modeling the gridded precipitation over the KCDA area and identifying the peak flow leaving the KCDA area for a variety of storm lengths. To match the design storm volume, the August 2016 historical storm was configured with a 1.65 scale factor for KCDA ME_WBGM_009_UG. The model simulation was created in HEC-RAS Version 6.5. This represents the 2017 to 2019 existing conditions Mermentau geometry with calibration regions configured for validation as an average of calibration events. The simulation includes: a constant boundary inflow hydrograph for the Mermentau River based the 50th percentile flow of 500 cfs; design storm precipitation based on scaling of the August 2016 storm event; a constant mean high high water variable downstream tidal boundary condition; a constant downstream stage hydrograph of constant 50th percentile of 2.49 ft (NAVD88) at the Gulf Intracoastal Water Way derived from USACE Gage #76800, and infiltration over the watershed. The initial simulation time step is 5 seconds with the control by courant condition option enabled, allowing HEC-RAS to adjust the timestep as condition warrant during the simulation. This simulation is most applicable from river station 9 (ungaged) of West Bayou Grand Marais to the upper watershed for West Bayou Grand Marais.",
    "model_software": "/model_software/697b9ae81c0ec3cd420f29ce",
    "model_application": "/model_application/685b2dc9dacd55d2b7c197f6",
    "type": "SCENARIO",
    "input_files": [
        {
            "title": "Boundary Condition File",
            "description": "Stores boundary condition information for simulation ",
            "location": "/ME_WBGM_009_UG/Mermentau_DS.b07"
        },
        {
            "title": "Initial Conditions File",
            "description": "Stores all configured hydraulic initial conditions for running simulation",
            "location": "/ME_WBGM_009_UG/Mermentau_DS.ic.o07"
        },
        {
            "title": "Unsteady Flow File ",
            "description": "Stores user-defined flow options, initial conditions and hydrographs are stored",
            "location": "/ME_WBGM_009_UG/Mermentau_DS.u07"
        },
        {
            "title": "Plan File",
            "description": "Contains a list of associated input files and all simulation options ",
            "location": "/ME_WBGM_009_UG/Mermentau_DS.p07"
        }
    ],
    "output_files": [
        {
            "title": "Unsteady Flow Log Output File",
            "description": "Stores the computational log and hydraulic solution error computations",
            "location": "/ME_WBGM_009_UG/Mermentau_DS.bco07"
        },
        {
            "title": "Plan HDF File",
            "description": "Contains plan level execution results that focuses on runtime statistics, convergence metrics, and execution status",
            "location": "/ME_WBGM_009_UG/Mermentau_DS.p07.hdf"
        },
        {
            "title": "DSS Output File",
            "description": "Stores time series hydraulics output for boundary conditions, 2D/SA connections, reference points and reference lines",
            "location": "/ME_WBGM_009_UG/ME_WBGM_009_UG_Aug2016_500yr_SF1p65/ME_WBGM_009_UG_Aug2016_500yr_SF1p65.dss"
        }
    ],
    "parameters": [],
    "temporal_extent": [
        "3000-08-01",
        "3000-08-04"
    ],
    "temporal_resolution": "5SEC",
    "_system": {
        "created_by": "hdr_lwi_region_5@hdrinc.com",
        "created_at": "2025-06-24T23:07:26.887527+00:00",
        "access_level": "public",
        "is_reviewed": true,
        "owner": "hdr_lwi_region_5@hdrinc.com"
    }
}