Updating U.S. Precipitation Frequency Estimates for the Northwest

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General Information
Study Number: TPF-5(454)
Lead Organization: Federal Highway Administration
Solicitation Number: 1526
Partners: ID, MT
Status: Cleared by FHWA
Est. Completion Date:
Contract/Other Number:
Last Updated: Sep 02, 2022
Contract End Date:
Financial Summary
Contract Amount:
Total Commitments Received: $640,895.00
100% SP&R Approval: Approved
Contact Information
Lead Study Contact(s): Megan Frye
Megan.Frye@dot.gov
Phone: 303- 396-9847
FHWA Technical Liaison(s): Cynthia Nurmi
Cynthia.Nurmi@dot.gov
Phone: 404- 895-0996
Study Champion(s): Megan Frye
Megan.Frye@dot.gov
Phone: 303- 396-9847
Organization Year Commitments Technical Contact Name Funding Contact Name Contact Number Email Address
Idaho Department of Transportation 2020 $240,335.00 Carrie Ann Hewitt Ned Parrish 208-334-8296 ned.parrish@itd.idaho.gov
Montana Department of Transportation 2020 $133,520.00 David Hedstrom Rebecca Ridenour (406)444-7203 rridenour@mt.gov
Montana Department of Transportation 2021 $133,520.00 David Hedstrom Rebecca Ridenour (406)444-7203 rridenour@mt.gov
Montana Department of Transportation 2022 $133,520.00 David Hedstrom Rebecca Ridenour (406)444-7203 rridenour@mt.gov

Study Description

National Oceanic and Atmospheric Administration’s (NOAA’s) National Weather Service (NWS) proposes updating precipitation frequency estimates for the states not included or in process for publication in the following Volumes of NOAA Atlas 14 “Precipitation-Frequency Atlas of the United States”: Volume 1 AZ, NM, NV, UT Volume 2 DE, DC, IL, IN, KY, MD, NC, NJ, OH, PA, SC, TN, VA, WV Volume 3 PR, VI Volume 4 HI Volume 5 Pacific Islands (selected) Volume 6 CA Volume 7 AK Volume 8 CO, IA, KS, MI, MN, MO, ND, NE, OK, SD, WI Volume 9 AL, AR, FL, GA, LA, MS Volume 10 CT, MA, ME, VT, NH, NY, RI, VT. Volume 11 TX Precipitation frequency estimates for the northwest states will be published as Volume 12 on the web at www.nws.noaa.gov/ohd/hdsc. The new NOAA Atlas 14 estimates are greatly improved in terms of accuracy, reliability and resolution. They are derived using improved data in terms of period of record and station density, state of the art statistical techniques, and spatial interpolation method that accounts for variation in terrain.

Objectives

The purpose of this study is to determine precipitation frequency estimates for Idaho, Montana and other the Northwest States for durations of 5-minute through 60-day at average recurrence intervals (ARIs) of 1-year through 1,000-year. The estimates and associated bounds of 90% confidence intervals will be provided at 30 arc-sec resolution (approximately 800 x 800 m; varies with latitude). The study results will be published as volumes of NOAA Atlas 14, a wholly web based publication available at www.nws.noaa.gov/ohd/hdsc. The publication will include the artifacts provided in previous NOAA Atlas 14 Volumes, including access through the Precipitation Frequency Data Server, base grids in standard formats together with error estimates, electronic copies of maps, charts of seasonal distributions and probabilistic temporal distributions of heavy precipitation, and detailed documentation. Updated areal reduction factors, which are needed to calculate analogous areal precipitation frequency estimates, will be developed as a separate appendix to NOAA Atlas 14 for the entire U.S. They include regional frequency analysis based on L-moments including error estimates, a combination of PRISM based techniques and CRAB for spatial interpolation, techniques for the analysis of climatic trend, temporal distribution and seasonality, internal consistency checks and variety of automated processes designed to enhance productivity. Intermediate results in the form of hourly and daily estimates at several ARIs will be distributed for peer review as will the final documentation.

Scope of Work

The attached proposed Statement of Work by NOAA provides detailed information on the following: Task 1 - Data Collection and Quality Control Task 2 – Regionalization and Calculation of Regional Statistics Task 3 - Frequency Distribution Selection and Frequency Calculations Task 4 - Estimates for 5-minute and 10-minute Durations Task 5 - Internal consistency at observing locations Task 6 - Error Estimates for DDF/IDF Curves Task 7 - Rainfall Frequency Estimates with Confidence Limits Task 8 - Spatial Interpolation and Consistency Task 9 - Temporal Distributions Task 10.- Peer Review Task 11 - Documentation Task 12 - Final Deliverables Task 13 - Status Reporting

Comments

Commitments Required: $640,894

Subjects: Bridges, Other Structures, and Hydraulics and Hydrology

Documents Attached
Title File/Link Type Privacy Download
TPF Quarterly Report Form - Q2 2022 TPF 5(474) Quarterly Report Form - Q2 2022.docx Quarterly Progress Report Public
TPF Quarterly Report Form - Q1 2022 TPF 5(474) Quarterly Report Form - Q1 2022.docx Quarterly Progress Report Public
TPF Quarterly Report Form - Q4 2021 TPF Quarterly Report Form - Q4 2021.docx Quarterly Progress Report Public
TPF Quarterly Report Form - Q3 2021 TPF Quarterly Report Form - Q3 2021.docx Quarterly Progress Report Public
TPF 5(454) Quarterly Report Q2 2021 TPF Quarterly Report Form - Q2 2021.docx Quarterly Progress Report Public
TPF 5(454) Quarterly Report Q1 2021 TPF Quarterly Report Form - Q1 2021.docx Quarterly Progress Report Public
TPF 5(454) Quarterly Report Q4 2020 TPF Quarterly Report Form - Q4 2020.docx Quarterly Progress Report Public
TPF 5(454) Quarterly Report Q3 2020 TPF Quarterly Report Form - Q3 2020.docx Quarterly Progress Report Public
TPF 5(454) Quarterly Report Q2 2020 TPF Quarterly Report Form - Q2 2020.docx Quarterly Progress Report Public
Approval of SPR Waiver Memorandum Public
Acceptance Letter Acceptance Memo-TPF-5(454).july92020.pdf Memorandum Public
Documents Attached
Title File/Link Type Privacy Download
SP&R 100% Waiver Other Public
Scope of Work NOAA_Proposal_Atlas 14_ID&MT_Mar2020.pdf Work Plan Public

Updating U.S. Precipitation Frequency Estimates for the Northwest

General Information
Study Number: TPF-5(454)
Lead Organization: Federal Highway Administration
Solicitation Number: 1526
Partners: ID, MT
Status: Cleared by FHWA
Est. Completion Date:
Contract/Other Number:
Last Updated: Sep 02, 2022
Contract End Date:
Financial Summary
Contract Amount:
Total Commitments Received: $640,895.00
100% SP&R Approval:
Contact Information
Lead Study Contact(s): Megan Frye
Megan.Frye@dot.gov
Phone: 303- 396-9847
FHWA Technical Liaison(s): Cynthia Nurmi
Cynthia.Nurmi@dot.gov
Phone: 404- 895-0996
Commitments by Organizations
Organization Year Commitments Technical Contact Name Funding Contact Name Contact Number Email Address
Idaho Department of Transportation 2020 $240,335.00 Carrie Ann Hewitt Ned Parrish 208-334-8296 ned.parrish@itd.idaho.gov
Montana Department of Transportation 2020 $133,520.00 David Hedstrom Rebecca Ridenour (406)444-7203 rridenour@mt.gov
Montana Department of Transportation 2021 $133,520.00 David Hedstrom Rebecca Ridenour (406)444-7203 rridenour@mt.gov
Montana Department of Transportation 2022 $133,520.00 David Hedstrom Rebecca Ridenour (406)444-7203 rridenour@mt.gov

Study Description

Study Description

National Oceanic and Atmospheric Administration’s (NOAA’s) National Weather Service (NWS) proposes updating precipitation frequency estimates for the states not included or in process for publication in the following Volumes of NOAA Atlas 14 “Precipitation-Frequency Atlas of the United States”: Volume 1 AZ, NM, NV, UT Volume 2 DE, DC, IL, IN, KY, MD, NC, NJ, OH, PA, SC, TN, VA, WV Volume 3 PR, VI Volume 4 HI Volume 5 Pacific Islands (selected) Volume 6 CA Volume 7 AK Volume 8 CO, IA, KS, MI, MN, MO, ND, NE, OK, SD, WI Volume 9 AL, AR, FL, GA, LA, MS Volume 10 CT, MA, ME, VT, NH, NY, RI, VT. Volume 11 TX Precipitation frequency estimates for the northwest states will be published as Volume 12 on the web at www.nws.noaa.gov/ohd/hdsc. The new NOAA Atlas 14 estimates are greatly improved in terms of accuracy, reliability and resolution. They are derived using improved data in terms of period of record and station density, state of the art statistical techniques, and spatial interpolation method that accounts for variation in terrain.

Objectives

The purpose of this study is to determine precipitation frequency estimates for Idaho, Montana and other the Northwest States for durations of 5-minute through 60-day at average recurrence intervals (ARIs) of 1-year through 1,000-year. The estimates and associated bounds of 90% confidence intervals will be provided at 30 arc-sec resolution (approximately 800 x 800 m; varies with latitude). The study results will be published as volumes of NOAA Atlas 14, a wholly web based publication available at www.nws.noaa.gov/ohd/hdsc. The publication will include the artifacts provided in previous NOAA Atlas 14 Volumes, including access through the Precipitation Frequency Data Server, base grids in standard formats together with error estimates, electronic copies of maps, charts of seasonal distributions and probabilistic temporal distributions of heavy precipitation, and detailed documentation. Updated areal reduction factors, which are needed to calculate analogous areal precipitation frequency estimates, will be developed as a separate appendix to NOAA Atlas 14 for the entire U.S. They include regional frequency analysis based on L-moments including error estimates, a combination of PRISM based techniques and CRAB for spatial interpolation, techniques for the analysis of climatic trend, temporal distribution and seasonality, internal consistency checks and variety of automated processes designed to enhance productivity. Intermediate results in the form of hourly and daily estimates at several ARIs will be distributed for peer review as will the final documentation.

Scope of Work

The attached proposed Statement of Work by NOAA provides detailed information on the following: Task 1 - Data Collection and Quality Control Task 2 – Regionalization and Calculation of Regional Statistics Task 3 - Frequency Distribution Selection and Frequency Calculations Task 4 - Estimates for 5-minute and 10-minute Durations Task 5 - Internal consistency at observing locations Task 6 - Error Estimates for DDF/IDF Curves Task 7 - Rainfall Frequency Estimates with Confidence Limits Task 8 - Spatial Interpolation and Consistency Task 9 - Temporal Distributions Task 10.- Peer Review Task 11 - Documentation Task 12 - Final Deliverables Task 13 - Status Reporting

Comments

Commitments Required: $640,894

Subjects: Bridges, Other Structures, and Hydraulics and Hydrology

Title File/Link Type Private
Acceptance Letter Acceptance Memo-TPF-5(454).july92020.pdf Memorandum Public
Approval of SPR Waiver Memorandum Public
TPF 5(454) Quarterly Report Q2 2020 TPF Quarterly Report Form - Q2 2020.docx Quarterly Progress Report Public
TPF 5(454) Quarterly Report Q3 2020 TPF Quarterly Report Form - Q3 2020.docx Quarterly Progress Report Public
TPF 5(454) Quarterly Report Q4 2020 TPF Quarterly Report Form - Q4 2020.docx Quarterly Progress Report Public
TPF 5(454) Quarterly Report Q1 2021 TPF Quarterly Report Form - Q1 2021.docx Quarterly Progress Report Public
TPF 5(454) Quarterly Report Q2 2021 TPF Quarterly Report Form - Q2 2021.docx Quarterly Progress Report Public
TPF Quarterly Report Form - Q3 2021 TPF Quarterly Report Form - Q3 2021.docx Quarterly Progress Report Public
TPF Quarterly Report Form - Q4 2021 TPF Quarterly Report Form - Q4 2021.docx Quarterly Progress Report Public
TPF Quarterly Report Form - Q1 2022 TPF 5(474) Quarterly Report Form - Q1 2022.docx Quarterly Progress Report Public
TPF Quarterly Report Form - Q2 2022 TPF 5(474) Quarterly Report Form - Q2 2022.docx Quarterly Progress Report Public
Title File/Link Type Private
SP&R 100% Waiver Other Public
Scope of Work NOAA_Proposal_Atlas 14_ID&MT_Mar2020.pdf Work Plan Public

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