fbo_PWS.docx

PERFORMANCE WORK STATEMENT

Description: This purchase order is to perform HEC-RAS 2D Test experiments and to provide HEC with the verification/validation test data sets in HEC-RAS format, as well as a validation document describing each test data set. The test data sets include very specific lab experiments with observed (measured) results. There are five specific data sets that will need to be modeled and documented using HEC-RAS:

1. Dam break in a curved channel

2. Flow in a Parshall flume

3. Flow in a converging channel (subcritical and supercritical)

4. Flow around a spur-dike (subcritical)

5. Flow in a 180 degree channel bend

Task 1: Perform Tests with HEC-RAS 2D. This task is to develop five HEC-RAS 2D models, one for each of the five test data sets listed in the description. The goal is to develop the best possible 2D HEC-RAS model for each test data set and compare the HEC-RAS results to observed data. This will require full understanding of each lab experiment, as well as full understanding of the best possible approach for using HEC-RAS 2D for the experiment.

Data for each of these experiments must be gathered by the contractor. Documentation for these five experiments is available in literature; the experiments have been developed by other researchers and documentation is available describing the geometric configuration of the system, modeling coefficients, and boundary conditions. Two journal articles are attached as references to this PWS and they contain enough information to re-create the five test data sets.

Task 1 –Deliverable: HEC-RAS data sets for all five verification/validation experiments within 90 days from award of delivery order. HEC staff will review the data sets within 15 days of receiving them. Contractor will revise the data sets according to any comments provided by HEC staff and submit revised HEC-RAS model data sets for final acceptance within 15 days of receiving comments from HEC staff.

Task 2: Develop Verification Documentation. This task is to develop a MS Word document that describes in detail each test data set, and the comparison of results between HEC-RAS results and the observed data. All data and model development required to perform each of the five experiments must be described in the document. Additionally, graphs, tables, and goodness of fit metrics (where appropriate) comparing the observed measurements and the HEC-RAS results must be provided for each experiment.

The documentation for each of the test data sets must include the following:

A. Objective of the test experiment.

B. Description of the test data set:

a. Terrain Data

b. Extents and dimensions of the test area

c. Boundary conditions

d. Roughness

e. Mesh description (cell size, breaklines etc…)

f. Computational time step used

g. Simulation time window

h. Etc… any other relevant information about the experiment.

C. Discussion of results, including text, graphics, and tables (where relevant), with enough detail to show HEC-RAS results compared to the experimental observed data.

Task 2 –Deliverable: An MS Word Document describing the five experiments and the results within 120 days from award of delivery order. HEC will review and document within 10 workdays and provide comments back to the contractor. The contractor will have 10 workdays to respond and correct any issues found by HEC in the document.

Items Provided By HEC: HEC will provide the current versions of the HEC-RAS software in order to develop these 5 test data sets.

Payment Schedule: Payment can be made upon completion and acceptance of each individual task item.

W91238-16-P-XXXX Ford RAS Verification-Validation PWS