CE 4260 Spring 2021 BLE Model Mini-Project_April_15_2021

CE 4260 Spring 2021 FEMA BLE Assignment: Using FEMA BLE Models to Inform Design Through its contractors, FEMA develops Base Level Engineering models of watersheds. - On February 2, 2021, Ryan Clark made a presentation on the intended uses and applications for these models. - On March 4, 2021, Bridget Bailey gave a guest lecture talking about the flooding (March and August 2016) flooding in Tangipahoa Parish. She also discussed their efforts for more effective planning and design to protect their residents, while continuing to enable and promote economic growth. - On March 12, 2021, Colin Anderson provided some background on how the BLE model is developed and structured, and how to look at and interpret results. Colin showed some examples (water surface elevations and flows) from 10yr and 100 yr rainfall event scenarios that included the entire watershed “without projects”, individual reservoirs/dams located on four tributaries (Terry’s Creek; Bala Chitto; Beaver Creek; Big Creek); and if all four reservoirs/dams were implemented at once. In place of your working directly with the HEC-RAS BLE model of the Tangipahoa River, we have designed a short exercise and provided you with some of the model outputs. The objective of this exercise is for you to use flow and maximum water surface elevation data, that has been extracted from the BLE Model, plot the data, and make some observations and comments about the effectiveness of upstream detention for the scenarios you have been assigned. Below the table are detailed step-by-step instructions for where to find the data and what I want for the final powerpoint. Think of the final powerpoint as something that you would use in a presentation to Bridge Bailey and/or stakeholders, officials, etc. from Tangipahoa Parish about the use of the BLE model to look at the effectiveness of different upriver detention (reservoirs) on mitigating flooding. Individual scenarios (note: in addition to your individual scenario, everyone will use Base Case (no reservoirs) and All Reservoirs) Base Case All Reservoirs Specific Reservoir Event Alexander, Silas IV Y Y Bala Chitto 10 Alhemeiri, Khalifa Mohammed Y Y Beaver Creek 10 Amous, Ahmad O Y Y Big Creek 10 Batts, Atrevius D Y Y Terry's Creek 10 Brading, Blaine Y Y Bala Chitto 100 Brothers, Jeffrey Patrick J Y Y Beaver Creek 100 Castro, Roberto Jr Y Y Big Creek 100 Celaya-Hernandez, Juan Manu Y Y Terry's Creek 100 Cook, Allison G Y Y Bala Chitto 10 Fontenelle, Daniel M Y Y Beaver Creek 10

Fontenot, Amanda Marie Y Y Bala Chitto 10 Frey, Garrett Martin Y Y Big Creek 10 Guillory, Wesley Joseph Y Y Terry's Creek 10 Hagan, James Austin III Y Y Bala Chitto 100 Hamilton, Clare Y Y Beaver Creek 100 Hatcher, Alex Edward Y Y Big Creek 100 Hebert, Hunter Y Y Terry's Creek 100 Hunt, Dalton T Y Y Bala Chitto 10 Hutchinson, Kirk A Jr Y Y Beaver Creek 10 Kazmyrskyi, Viktor Y Y Big Creek 10 Kyle, Franklin Y Y Terry's Creek 10 Lafleche, Ory Kaelyn Y Y Bala Chitto 100 Lenich, Todd Robert Y Y Beaver Creek 100 Macaluso, Basil Vincent Y Y Big Creek 100 Mudd, Julia C Y Y Bala Chitto 100 Ortiz, Kimberly Y Y Y Terry's Creek 100 Qulaq, Khaled Bashir Y Y Bala Chitto 10 Ray, Mason T Y Y Beaver Creek 10 Resendez, Lance M Jr Y Y Big Creek 10 Riggins, Joshua Marcus Y Y Terry's Creek 10 Rizzo, Jonathan Mitchell Y Y Bala Chitto 100 RobertsonIII, Dennis James Y Y Beaver Creek 100 Rodriguez-Fierro, Priscilla Y Y Big Creek 100 Rullman, Evan A Y Y Terry's Creek 100 Salopek, Sophie Grace Y Y Bala Chitto 10 Weems, Matthew S Y Y Beaver Creek 10 Wilson, Alyssa L Y Y Big Creek 10 Wolf, Benjamin Andrew Y Y Terry's Creek 10 Wolff, Brandon Y Y Terry's Creek 100 Ziegler, William Wren Y Y Bala Chitto 100 Instructions: 1. Each of you is to use the combination of reservoir and return period (e.g., Terry Creek 10 year) that is in the table above. 2. There are three files that you will use for this assignment. a. Powerpoint file that has figures showing where the reservoir dams are located and the cross-sections where the data was extracted from.

b. Also NOTE: just pick the station number in the tab that is closest to what is given in the upper left hand corner (in other words, there might not be a station # 2200 so pick the one close to that (e.g, 2200.873). 2. Each of you will need the BLE_Base_Model No Reservoirs (for this example, the 10 year) and the All Reservoir (for this example, the 10 year) maximum water surface data for the given station (see table below). 3. Following the Terry’s Creek example, you will then also need the “Terry’s Crk Reservoir_10yr maximum water surface data. 4. Copy the three maximum water surface elevations (BLE_Base_Model, All Reservoir, and Terry’s Crk Reservoir_10yr) for the given station (and insert into table below). In addition to putting these values in a table, calculate and add to the table the % reduction in the peak water surface values for the All Reservoir and Terry’s Crk Reservoir_10 yr scenarios and think about how much reduction there is in the maximum water surface elevation, if there is any. If not, say why you think that is the case. 5. The 4 th tab in the WSE spreadsheet (WSE-Terry’s Crk_Tributary) contains the maximum water surface elevation data for the Terry’s Crk_Tributary profile line. Again, extract, calculate % differences, and comment on the differences between the BLE_Base_Model No Reservoir, All Reservoir, and Terry’s Crk Reservoir_10yr maximum water surface elevation values. 6. The 5 th tab in the WSE spreadsheet (WSE-Terry’s Crk_Tangipahoa CS) contains the water surface data for the profile line in the Tangipahoa River, just downstream of where Terry’s Creek merges with the Tangipahoa River. Again, extract, calculate % differences, and comment on the differences between the BLE_Base_Model, All Reservoir, and Terry’s Crk Reservoir_10yr water surfaces. 7. Note that the table has N/A in the “No Reservoirs” % difference cells since the maximum water surface elevation is what you are comparing the other values to. Station Numbers for Extracting Maximum Water Surface Elevation Location Station Robert 2700 Bala Chitto_Tributary 2000 Bala Chitto_Tang. CS 2200 Terry's_Tributary 3100 Terry's_Tang. CS 3400 Beaver_Tributary 870 Beaver_Tang. CS 2600 Big Crk_Tributary 1050 Big Crk_Tang. CS 2500 Tangipahoa Headwater 2000 Example Table for PowerPoint Profile Max WSE (NAVD88) Robert % Difference Max WSE Robert Max WSE (NAVD88) Terry’s Crk_Tributar % Difference Max WSE Terry’s Max WSE (NAVD88) Terry’s Crk_Tangipah % Difference Max WSE Terry’s Crk_Tangipah

y Crk_Tributar y oa CS oa BLE Base Model (No Reservoirs_1 0yr) N/A N/A N/A BLE Base Model (All Reservoirs_1 0yr) Terry’s Crk Reservoir_10 yr) Your powerpoint file should contain the following: 1. One slide with a figure of the basin (what is in the powerpoint) and highlighting your particular study region (e.g,. Terry’s Creek) 2. On slide with a close-up of your particularly study region (what is in the powerpoint) 3. Graphs that you have made of the flows. Probably makes sense to start with the flows and water surface elevations along your study site profile line, then put a slide with the data from the Tangipahoa River, just downstream of your study region, and then a slide from Robert. 4. Remember – all of your plots will have three sets of data on them – base BLE model (w/o any reservoirs) results, model results with just your reservoir, and model results with all four reservoirs. 5. On one slide copy and paste your completed max water surface elevation data table. 6. In the notes section of your slides, put your observations and comments on what you “see”, including % reduction in peak (if any), changes in max water surface elevations, delayed peak, etc. 7. You should also have one slide that is your “Conclusions” – what can you say about the effectiveness of your reservoir in terms of peak flows and water surface elevations at the three locations you have profile lines for. 8. We will be looking for clear graphs with labelled axes, consistent and clear symbols, legends, and titles describing what the graph is showing, as well as your insights and comments.