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This is the Calibration and Validation HUC08040301 and HUC08040305 Lower Red/Black (LRBK) HEC-HMS v4.9 model developed by Freese and Nichols, Inc. (FNI) for the Louisiana Watershed Initiative (LWI). This model leverages observed rainfall data and produces flow hydrographs to be used in the HUC08040301 and HUC08040305 (LRBK) HEC-RAS v6.3.1 calibration and validation model. The model covers the entire HUC8 and used the vertical datum NAVD88 and the Albers Conical Equal Area D_North American_1983 projection.

Keywords: ['Frequency', 'HEC', 'hec-hms', 'HMS', 'Hydrology', 'lwi', 'Model', 'modeling region 2', 'planning region 2', 'Software', 'USACE']

This is the Calibration and Validation HUC08040302 Castor (CA) HEC-HMS v4.9 model developed by Freese and Nichols, Inc. (FNI) for the Louisiana Watershed Initiative (LWI). This model leverages observed rainfall data and produces flow hydrographs to be used in the HUC08040302 CA HEC-RAS v6.3.1 calibration and validation model. The model covers the entire HUC8 and used the vertical datum NAVD88 and the Albers Conical Equal Area D_North American_1983 projection.

Keywords: ['Frequency', 'HEC', 'hec-hms', 'HMS', 'Hydrology', 'lwi', 'Model', 'modeling region 2', 'planning region 2', 'Software', 'USACE']

This HUC08040202 Lower Ouachita - Bayou De Loutre (OL) HEC-RAS version 6.3.1 model was developed by Freese and Nichols, Inc. (FNI) for calibration and validation as part of the Louisiana Watershed Initiative (LWI) modeling program. This model is located in the LWI modeling Region 2. This is a 1D-2D model that leverages internal inflows developed by the OL HEC-HMS Calibrated and Validated model and external inflows sourced from the USACE Ouachita CWMS HEC-RAS model and Bayou Bartholomew (BW) HEC-RAS model. The modeled streams include: Ouachita River, Bayou De Loutre, Bayou De Butte, Big Creek, Frank Lapere Creek, Rock Creek, Shiloh Creek, and Williamson Creek. The terrain used for modeling primarily sources the 2021 Department of Transportation and Development LiDAR with bathymetry incorporated from surveys conducted by Bryant Hammett & Associates in 2021 and 2022. The model and terrain use the vertical datum NAVD88 and the State-Plane projection NAD 1983 (2011) State Plane Louisiana North FIPS 1701 (US Feet).

Keywords: ['6.3.1', 'hec', 'HEC-RAS', 'Hydraulic', 'lwi', 'model', 'modeling region 2', 'planning region 3', 'ras']

This is the Calibration and Validation HUC08040303 Dugdemona (DU) HEC-HMS v4.9 model developed by Freese and Nichols, Inc. (FNI) for the Louisiana Watershed Initiative (LWI). This model leverages observed rainfall data and produces flow hydrographs to be used in the HUC08040303 DU HEC-RAS v6.3.1 calibration and validation model. The model covers the entire HUC8 and used the vertical datum NAVD88 and the Albers Conical Equal Area D_North American_1983 projection.

Keywords: ['Frequency', 'HEC', 'hec-hms', 'HMS', 'Hydrology', 'lwi', 'Model', 'modeling region 2', 'planning region 2', 'Software', 'USACE']

This HUC08040301 and HUC08040305 Lower Red/Black (LRBK) HEC-RAS version 6.3.1 model was developed by Freese and Nichols, Inc. (FNI) for calibration and validation as part of the Louisiana Watershed Initiative (LWI) modeling program. This model is located in the LWI modeling Region 2. This is a 1D-2D model that leverages internal inflows developed by the LRBK HEC-HMS Calibrated and Validated model, external inflows sourced from the Little (LI) and Lower Ouachita (OU) HEC-RAS models, and gage information. The modeled streams include: Bayou Maria, Brushy Fork, Red River, Black River, Catahoula Lake Diversion Canal (CLDC). The terrain used for modeling primarily sources the 2021 Department of Transportation and Development LiDAR with bathymetry incorporated from surveys conducted by GOTECH, Inc. in 2022 and 2023. The model and terrain use the vertical datum NAVD88 and the State-Plane projection NAD 1983 (2011) State Plane Louisiana North FIPS 1701 (US Feet).

Keywords: ['6.3.1', 'hec', 'HEC-RAS', 'Hydraulic', 'lwi', 'model', 'modeling region 2', 'planning region 2', 'ras']

This HUC08040302 Castor (CA) HEC-RAS version 6.3.1 model was developed by Freese and Nichols, Inc. (FNI) for calibration and validation as part of the Louisiana Watershed Initiative (LWI) modeling program. This model is located in the LWI modeling Region 2. This is a 1D-2D model that leverages internal inflows developed by the CA HEC-HMS Calibrated and Validated model. The modeled streams include: Castor Creek, Hurricane Creek, Bushy Creek, Beaucoup Creek, Chickasaw Creek, Sandy Creek, Flat Creek, Beech Creek. The terrain used for modeling primarily sources the 2021 Department of Transportation and Development LiDAR with bathymetry incorporated from surveys conducted by Nixon Engineering in 2022 and 2023. The model and terrain use the vertical datum NAVD88 and the State-Plane projection NAD 1983 (2011) State Plane Louisiana North FIPS 1701 (US Feet).

Keywords: ['6.3.1', 'hec', 'HEC-RAS', 'Hydraulic', 'lwi', 'model', 'modeling region 2', 'planning region 2', 'ras']

This HUC08040206 Bayou D'Arbonne (AR) HEC-RAS version 6.3 model was developed by Freese and Nichols, Inc. (FNI) for calibration and validation as part of the Louisiana Watershed Initiative (LWI) modeling program. This model is located in the LWI modeling Region 2. This is a 1D-2D model that leverages internal inflows developed by the AR HEC-HMS Calibrated and Validated model. The modeled streams include: Bayou D'Arbonne, Middle Fork Bayou D'Arbonne, Corney Bayou, Cypress Creek, Little Corney, Beever Creek, Stowe Creek, Big Creek, Bayou Choudrant, Choudrant Creek, Fourmile Creek, Mill Creek, Colvin Creek. The terrain used for modeling primarily sources the 2021 Department of Transportation and Development LiDAR with bathymetry incorporated from surveys conducted by Nixon Engineering in 2021 and 2022. The model and terrain use the vertical datum NAVD88 and the State-Plane projection NAD 1983 (2011) State Plane Louisiana North FIPS 1701 (US Feet).

Keywords: ['6.3', 'hec', 'HEC-RAS', 'Hydraulic', 'lwi', 'model', 'modeling region 2', 'planning region 3', 'ras']

This is the Calibration and Validation HUC08040205 Bayou Bartholomew (BW) HEC-HMS v4.9 model developed by Freese and Nichols, Inc. (FNI) for the Louisiana Watershed Initiative (LWI). This model leverages observed rainfall data and produces flow hydrographs to be used in the HUC08040205 BW HEC-RAS v6.3.1 calibration and validation model. The model covers the entire HUC8 and used the vertical datum NAVD88 and the Albers Conical Equal Area D_North American_1983 projection.

Keywords: ['Frequency', 'HEC', 'hec-hms', 'HMS', 'Hydrology', 'lwi', 'Model', 'modeling region 2', 'planning region 3', 'Software', 'USACE']

This model is the calibrated hydrological HEC-HMS model for the Louisiana Watershed Inititative (LWI) pilot study conducted for quantifying compound flood hazard in regions near the coastline, where both riverine and coastal flood drivers are significant contributors to total flood hazard, known as the transition zone (TZ). The procedure to quantify compound flood hazard involves 1) developing numerical models capable of simulating rainfall-runoff and coastal hydrodynamic processes, 2) generating a set of tropical storms and non-tropical storms (i.e., all storm types other than tropical storms, which include extratropical cyclones, frontal storms, and convective storms) representative of compound flooding conditions in the basin(s) of interest, 3) simulating storms incorporating a range of compound flooding conditions using the numerical models, and 4) leveraging Joint Probability Method – Optimal Sampling (JPM-OS) and extreme value analysis (EVA) methods to assess water level recurrence intervals for tropical and non-tropical events respectively. The procedures documented within the LWI pilot study memoranda balance rigor with computational efficiency to produce a set of annual exceedance probability (AEP) water surface elevations within the basin(s) of interest. Once methods are finalized, water level AEPs and other model data could be used to inform planning and design activities in the coastal and compound flood transition zone. This LWI Amite Calibrated HEC-HMS Model is meant to address item 1) in the paragraph above for hydrological modeling. The outputs from this model are used in the LWI Amite HEC-RAS Model. The hydrologic and hydraulic model calibration and validation tests assessed model performance relative to observations from a suite of six storms: Hurricane Katrina (2005), Hurricane Gustav (2008), Hurricane Isaac (2012), Hurricane Barry (2019), and two non-tropical storms from March and August 2016, respectively. Performance was assessed using quantitative metrics including mean volume bias, Nash-Sutcliffe efficiency, and root-mean-square error (RMSE), as recommended by Moriasi et al. (2007). Source: MODEL CALIBRATION AND VALIDATION - AMITE RIVER BASIN PILOT STUDY TECHNICAL MEMORANDUM The Water Institute, Hugh Roberts, Brendan Yuill, Nate Young, et. al. (2021)

Keywords: ['Amite', 'calibration', 'Frequency', 'HEC', 'hec-hms', 'HMS', 'Hydrology', 'LWI', 'Model', 'pilot study', 'Software', 'USACE', 'validation']

This is the Calibration and Validation HUC08040202 Lower Ouachita-Bayou De Loutre (OL) HEC-HMS v4.9 model developed by Freese and Nichols, Inc. (FNI) for the Louisiana Watershed Initiative (LWI). This model leverages observed rainfall data and produces flow hydrographs to be used in the HUC08040202 OL HEC-RAS v6.3.1 calibration and validation model. The model covers the entire HUC8 and used the vertical datum NAVD88 and the Albers Conical Equal Area D_North American_1983 projection.

Keywords: ['Frequency', 'HEC', 'hec-hms', 'HMS', 'Hydrology', 'lwi', 'Model', 'modeling region 2', 'planning region 3', 'Software', 'USACE']

This HUC08040304 Little (LI) HEC-RAS version 6.3.1 model was developed by Freese and Nichols, Inc. (FNI) for calibration and validation as part of the Louisiana Watershed Initiative (LWI) modeling program. This model is located in the LWI modeling Region 2. This is a 1D-2D model that leverages internal inflows developed by the LI HEC-HMS Calibrated and Validated model and external inflows sourced from the Dugdemona (DU) HEC-RAS and Castor (CA) HEC-RAS model. The modeled streams include: Little River and unnamed tributaries, Flagon Bayou and unnamed tributaries, Haw Cr, Kitchen Creek and unnamed tributary, Dry Prong, Hemphill Creek and unnamed tributaries, Hair Creek, Big Creek, Trout Creek, Funny Lewis Bayou, Mills Bayou, Bushley Bayou, Wild Life Refuge streams, Catahoula Lake, Bear Creek, Indian Creek. The terrain used for modeling primarily sources the 2021 Department of Transportation and Development LiDAR with bathymetry incorporated from surveys conducted by Bryant Hammett & Associates in 2021, 2022, and 2023. The model and terrain use the vertical datum NAVD88 and the State-Plane projection NAD 1983 (2011) State Plane Louisiana North FIPS 1701 (US Feet).

Keywords: ['6.3.1', 'hec', 'HEC-RAS', 'Hydraulic', 'lwi', 'model', 'modeling region 2', 'planning region 2', 'ras']

This is the Calibration and Validation HUC08040207 Lower Ouachita (OU) HEC-HMS v4.9 model developed by Freese and Nichols, Inc. (FNI) for the Louisiana Watershed Initiative (LWI). This model leverages observed rainfall data and produces flow hydrographs to be used in the HUC08040207 OU HEC-RAS v6.3 calibration and validation model. The model covers the entire HUC8 and used the vertical datum NAVD88 and the Albers Conical Equal Area D_North American_1983 projection.

Keywords: ['Frequency', 'HEC', 'hec-hms', 'HMS', 'Hydrology', 'lwi', 'Model', 'modeling region 2', 'planning region 3', 'Software', 'USACE']

This HUC08040303 Dugdemona (DU) HEC-RAS version 6.3.1 model was developed by Freese and Nichols, Inc. (FNI) for calibration and validation as part of the Louisiana Watershed Initiative (LWI) modeling program. This model is located in the LWI modeling Region 2. This is a 1D-2D model that leverages internal inflows developed by the DU HEC-HMS Calibrated and Validated model. The modeled streams include: Dugdemona River and tributaries, Shepherd Creek and tributaries, Cypress Bayou, Madden Creek, Redwine Creek and tributaries, Little Dugdemona River, Big Creek, Kyiaies Creek, Sonnett Creek, Port de Luce Creek. The terrain used for modeling primarily sources the 2021 Department of Transportation and Development LiDAR with bathymetry incorporated from surveys conducted by Nixon Engineering in 2022. The model and terrain use the vertical datum NAVD88 and the State-Plane projection NAD 1983 (2011) State Plane Louisiana North FIPS 1701 (US Feet).

Keywords: ['6.3.1', 'hec', 'HEC-RAS', 'Hydraulic', 'lwi', 'model', 'modeling region 2', 'planning region 2', 'ras']

This is the Calibration and Validation HUC08040206 Bayou D'Arbonne (AR) HEC-HMS v4.9 model developed by Freese and Nichols, Inc. (FNI) for the Louisiana Watershed Initiative (LWI). This model leverages observed rainfall data and produces flow hydrographs to be used in the HUC08040206 AR HEC-RAS v6.3 calibration and validation model. The model covers the entire HUC8 and used the vertical datum NAVD88 and the Albers Conical Equal Area D_North American_1983 projection.

Keywords: ['Frequency', 'HEC', 'hec-hms', 'HMS', 'Hydrology', 'lwi', 'Model', 'modeling region 2', 'planning region 3', 'Software', 'USACE']

This is the Calibration and Validation HUC08040304 Little (LI) HEC-HMS v4.9 model developed by Freese and Nichols, Inc. (FNI) for the Louisiana Watershed Initiative (LWI). This model leverages observed rainfall data and produces flow hydrographs to be used in the HUC08040304 LI HEC-RAS v6.3.1 calibration and validation model. The model covers the entire HUC8 and used the vertical datum NAVD88 and the Albers Conical Equal Area D_North American_1983 projection.

Keywords: ['Frequency', 'HEC', 'hec-hms', 'HMS', 'Hydrology', 'lwi', 'Model', 'modeling region 2', 'planning region 2', 'Software', 'USACE']

This HUC08040205 Bayou Bartholomew (BW) HEC-RAS version 6.3.1 model was developed by Freese and Nichols, Inc. (FNI) for calibration and validation as part of the Louisiana Watershed Initiative (LWI) modeling program. This model is located in the LWI modeling Region 2. This is a 1D-2D model that leverages internal inflows developed by the BW HEC-HMS Calibrated and Validated model. The downstream boundary condition is a calibrated normal depth. The modeled streams include: Bayou Bartholomew, Horse Bayou, Cypress Bayou, Bayou De Glaize, and Chemin-A-Haut Bayou. The terrain used for modeling primarily sources the 2021 Department of Transportation and Development LiDAR with bathymetry incorporated from surveys conducted by Bryant Hammett & Associates in 2021, 2022, and 2023. The model and terrain use the vertical datum NAVD88 and the State-Plane projection NAD 1983 (2011) State Plane Louisiana North FIPS 1701 (US Feet).

Keywords: ['6.3.1', 'hec', 'HEC-RAS', 'Hydraulic', 'lwi', 'model', 'modeling region 2', 'planning region 3', 'ras']