CITY OF YAKIMA

COMMUNITY DEVELOPMENT DEPARTMENT

TECHNICAL SERVICES

REQUEST FOR PROPOSALS

Publication Advertisement

The City of Yakima Community Development Department is requesting proposals from qualified firms interested in providing technical services to perform the Hydraulic Analysis project as listed below:

The City reserves the right to amend the terms of this “Request for Proposals” (RFP), and to circulate various addenda.

Proposals shall be limited to twelve (12) pages and shall follow the guidance listed below.  Proposals will be evaluated on a competitive basis using the criteria as listed.  The City will score the received proposals and may conduct interviews.

Proposals shall be received by email by 3:00 p.m., June 26, 2025, to engineering@yakimawa.gov.

Questions regarding the RFP should be directed to Bill Preston, PE, Community Development Director at (509) 576-6754, Bill.Preston@yakimawa.gov.

The City of Yakima in accordance with Section 504 of the Rehabilitation Act (Section 504) and the Americans with Disabilities Act (ADA), commits to nondiscrimination on the basis of disability, in all of its programs and activities. This material can be made available in an alternate format by emailing or calling Bill Preston at the information provided above.

The City of Yakima, in accordance with Title VI of the Civil Rights Act of 1964, (78 Stat. 252, 42 U.S.C. 2000d to 2000d-4) and the Regulations, hereby notifies all bidders that it will affirmatively ensure that in any contract entered into pursuant to this advertisement, disadvantaged business enterprises will be afforded full and fair opportunity to submit bids in response to this invitation and will not be discriminated against on the grounds of race, color, or national origin in consideration for an award.

Qualified disadvantaged, minority, and women-owned consultants are encouraged to respond.  The City of Yakima is an equal opportunity employer.

1. General Overview

The hired consultant will be responsible for conducting a comprehensive hydraulic analysis on the specified property. The goal of this project is to understand the hydraulic characteristics of the property, identify potential issues, and propose solutions. The consultant shall perform a hydraulic analysis in accordance with the Scope of Work (SOW).

1. Purpose

A hydraulic analysis is required to accurately determine the adverse impacts the construction of a single-family home has created on a floodplain located at 1010 South 91st Ave., Yakima, WA 98908. The home was constructed in the floodway in 2013.

The other purpose is to conduct an analysis of fencing in the Anderson Park subdivision, located at the southeast corner of Occidental Ave. and S. 64th Ave.

2. Key Responsibilities

1. Site Assessment: Conduct a thorough site assessment to understand the current hydraulic conditions and infrastructure. The analysis will document the observations from the reconnaissance and will include:
   1.  Photographs at locations of established FEMA model cross sections (For projects requiring FEMA documentation).
   2.  Document apparent high-water marks (e.g. marks on structures, seed lines, debris in trees, etc.) through GPS, descriptions, and photographs.

2. Data Collection: This task will include the collection, review and evaluation of all available data and information necessary to complete the hydrologic/hydraulic analyses, alternative formulation and evaluation, and preparation of construction drawings.  This information includes but may not be limited to:
   1.  Information on flood hydrology from all available official sources (Federal Emergency Management Agency (FEMA) Flood Insurance Study (FIS) reports; previous hydrology studies for the same watershed; high-water marks; anecdotal information from adjacent landowners).
   2.  Aerial imagery (a time history of aerial photographs may be desirable).
   3.  Any available, topographic and/or bathymetric data for the study reach that is in the public domain (refer to Section 2.5 for accuracy requirements). The Consultant will examine available topographic data and make recommendations on suitability for modeling to the Agency.
   4.  Site specific soil survey and geotechnical analyses (if scour analysis is performed)
   5.  1-foot topography generated from LiDAR.
   6. The City of Yakima’s utility inventory files including any available utility as-built and pothole data.
   7.  As-built drawings/design.
   8.  City of Yakima Building Permits.

3. Hydraulic Modeling Requirements: Develop a hydraulic model to simulate various scenarios and understand the behavior of water flow within the property. The precise specifications for quality depend upon the purposes of the modeling study, and how the model results will be used. Certain main components are common to all two-dimensional modeling studies. The Consultant is expected to develop model simulations that accurately represent the hydraulic effects of various manmade structures that exert a significant hydraulic control using the following:
   1. Encompass at least the full inundation width of the largest flood recurrence interval to be simulated, typically the 500-year flood.
   2. Individual buildings or enclosed areas with solid fences expected to have a significant effect on the hydraulics in the area of interest should be represented by creating a void in the mesh within the building or enclosure footprint.
   3. Represent widely scattered smaller buildings (such as a residential subdivision without solid fences, outside the area of interest) by using a higher Manning n value to represent the aggregate effects of the buildings, rather than creating many voids in the mesh.
   4. Align element edges at the crest and at the toe of the grade control for accurate depiction the floodplain profile.
   5. If the actual step in the grade control is vertical, depict it with a steep, non-vertical slope.

4. Model Outputs and Results: The Consultant shall prepare and submit the following, at a minimum, to clarify details of the model development:
   1. Plan view elevation contour plot of the terrain surface.
   2. Plan view plot showing the locations of monitoring points and monitoring lines.

5. Analysis and Interpretation: For building evaluations within a designated floodplain, the Consultant shall provide the following, in addition to the output and results described above:
   1. Tables of average water surface elevation along established FEMA model cross section lines for the 100-year flood, comparing proposed to existing conditions. In SMS, summary tables can be generated to document the minimum, maximum and average values for depth, water surface elevation, velocity and other variables along a line.
   2. Table of average water surface elevation along established FEMA model cross section lines for the 100- year flood with the regulatory floodway encroachments in place, comparing proposed and existing conditions.
   3. Table of the floodway widths at established FEMA model cross section lines for the 100-year flood, comparing proposed and existing conditions.
   4. Water surface elevations of the base flood (i.e., 100-year flood) and overtopping flood.

6. Site Assessment: The Consultant shall conduct a site reconnaissance visit for the purpose of documenting conditions on the ground.  The Consultant shall prepare and submit, within one month of completing the field reconnaissance, a Site Assessment Memorandum. The memorandum will document the observations from the reconnaissance and will include:
   1. Copies of field notes.
   2. An organized documentation of potential roughness value assignments for various ground cover type.
   3. Document apparent high-water marks (e.g., marks on structures, seed lines, debris in trees, etc.) through GPS, descriptions, and photographs.
   4. Description and photographs of any visible scour holes.
   5. Photographs at locations of established FEMA model cross sections (For projects requiring FEMA documentation).

7. Report Writing: A Prepare a detailed report outlining the findings, potential issues, and proposed solutions, including recommendations for the home in the floodplain, and recommendations for fencing in the Anderson Park Subdivision.

8. Deliverables: The Consultant shall submit the following deliverables, at a minimum:
   1. The Hydraulic Modeling Report, as described in the previous section.
   2. The Site Assessment Memorandum.
   3. The Review Memorandum, complete with model review checklist as an attachment.
   4. If SRH-2D and SMS are used: SMS project files and SRH-2D model output files, with an index explaining what each file is (include only the files from simulations actually used and cited in the report)
      1. The ‘File: Save As Package’ option may be used in SMS to ensure that all project files are included in a zip file for transfer or archive.
      2. The SMS ‘Edit: Project Metadata’ feature should be used to note important information, including:
         1. Model developer
         2. Location information
         3. Project purpose
         4. Source of terrain data
         5. Source of material roughness information
         6. Source of inflow data
         7. Structure notes
         8. Simulation summary (why specific simulations were performed)
         9. Calibration data information
   5. Results plots (if not already included in the report) that depict significant findings of the modeling.
   6. Supporting data, in electronic form, including:
      1. The digital terrain model files (LiDAR, TIN files, etc.).
      2. Projection files that established the horizontal coordinate system.
      3. As-built drawings of existing conditions and design drawings of proposed conditions (only the sheets that depict the hydraulically significant features).
   7. All floodplain related information relevant to the project including the governing regulations, correspondence or contact with floodplain administrators, and documentation of analysis that demonstrates compliance

The above work to be completed in 90 days.

Anticipated Schedule

Advertise RFP                                                          June 9, 2025

Proposals Due                                                         June 26, 2025

Shortlist Consultants (if necessary)                   June 27, 2025

Select Consultant                                                   June 30, 2025

Notice to Proceed                                                  July 3, 2025

Report Completion                                                October 3, 2025

Submittal Requirements

The Proposal should include the following:

1. Cover Letter describing the submitting firm and relevant experience, 1 page maximum.
2. Description of the project team, including any sub consultants, 3 pages maximum.
3. Summary of 3 similar projects with references, 3 pages maximum.
4. Description of the firm’s project approach, including methods proposed to complete the scope as outlined above.

Selection Process

Consultant selection will be based on the Proposals using the following criteria and weighting:

Criteria                                                                                           Points

1. Project Team Qualifications & Organization               0-20
2. Similar Projects/Experiences                                         0-15
3. Project Approach                                                             0-40
4. Cost                                                                                    0-25_

Max Points                                                                                   100

Staff will review the proposals received based on the evaluation criteria.  If necessary, staff will shortlist the prospective consultants for an interview.  Short-listed consultant teams will be ranked after the interview.  The City may choose to contact officials from other jurisdictions regarding the consultant, their prior work experience and their ability to successfully complete the work.

The City intends to enter into an agreement with the Consultant who provides a Proposal that, in the opinion of the City, best meets all of the below listed evaluation criteria as determined by the City’s selection committee and ranks the highest.  Upon selection of a Consultant, the City intends to enter into an agreement using its standard Professional Services Agreement, which shall be used to secure these services.

All communication with the City and/or questions related to this RFP shall be directed to Bill Preston, PE, at 509-576-6754, mailto:bill.preston@yakimawa.gov.