UPDATE PRECIPITATION FREQUENCY ESTIMATES FOR LOUISIANA (NOAA ATLAS 14 VOLUME 14)

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General Information
Study Number: TPF-5(477)
Lead Organization: Federal Highway Administration
Solicitation Number: 1543
Partners: LA
Status: Cleared by FHWA
Est. Completion Date:
Contract/Other Number:
Last Updated: Apr 15, 2021
Contract End Date:
Financial Summary
Contract Amount:
Total Commitments Received: $430,000.00
100% SP&R Approval: Approved
Contact Information
Lead Study Contact(s): Cynthia Nurmi
Cynthia.Nurmi@dot.gov
Phone: 404- 895-0996
FHWA Technical Liaison(s): Cynthia Nurmi
Cynthia.Nurmi@dot.gov
Phone: 404- 895-0996
Study Champion(s): Cynthia Nurmi
Cynthia.Nurmi@dot.gov
Phone: 404- 895-0996
Organization Year Commitments Technical Contact Name Funding Contact Name Contact Number Email Address
Louisiana Department of Transportation and Development 2021 $430,000.00 Eddie Legnon Eddie Legnon 225-219-9727 Eddie.legnon@la.gov

Study Description

The increase in the amount of available data from Volume 9 to Volume 14, both in the number of stations and their record lengths, could have a considerable effect on precipitation frequency estimates. For stations used in Volume 9, almost a decade of data has accumulated since the completion of the current estimates. Also, many stations that were not retained for analysis in Volume 9 due to short records will be considered for Volume 14.

Objectives

The purpose of this project is to update precipitation frequency estimates for Louisiana that are published in NOAA Atlas 14 Volume 9. Like previous NOAA Atlas 14 volumes, the estimates and associated bounds of 90% confidence intervals will be provided at 30 arc-sec resolution for durations of 5-minute through 60-day at average recurrence intervals (ARIs) of 1-year through 1,000-year. The study results will be published as NOAA Atlas 14 Volume 14, a wholly web based publication available at Precipitation Frequency Data Server (PFDS). The publication will include the artifacts provided in previous NOAA Atlas 14 Volumes, including access through the PFDS, 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 not be developed as a part of this project.

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 - Spatial interpolation and consistency

Task 8 - Temporal distributions

Task 9 - Peer review

Task 10 - Documentation

Task 11 - Final deliverables

Task 12 - Status Reporting

Comments

Multiple entities in Louisiana will contribute to this project, including:

o Office of Community Development (lead agency; OCD)

o Coastal Protection and Restoration Authority

o Department of Transportation and Development

o Office of Homeland Security and Emergency Preparedness

o Department of Wildlife and Fisheries

Subjects: Bridges, Other Structures, and Hydraulics and Hydrology

Documents Attached
Title File/Link Type Privacy Download
Acceptance Memo FHWA Led - Acceptance Memo TPF 5(477).pdf Memorandum Public
TPF 5(477) Quarterly Report Q2 2021 TPF Quarterly Report Form - Q2 2021.docx Quarterly Progress Report Public
Documents Attached
Title File/Link Type Privacy Download
Approved Waiver Memo Approval of SPR Waiver Pooled Fund Solicitation#1543.pdf Memorandum Public
Budget Budget Volume 14.docx Other Public
SOW NOAA_SOW_Proposal_Atlas14_LA_20201218.docx Work Plan Public

UPDATE PRECIPITATION FREQUENCY ESTIMATES FOR LOUISIANA (NOAA ATLAS 14 VOLUME 14)

General Information
Study Number: TPF-5(477)
Lead Organization: Federal Highway Administration
Solicitation Number: 1543
Partners: LA
Status: Cleared by FHWA
Est. Completion Date:
Contract/Other Number:
Last Updated: Apr 15, 2021
Contract End Date:
Financial Summary
Contract Amount:
Total Commitments Received: $430,000.00
100% SP&R Approval:
Contact Information
Lead Study Contact(s): Cynthia Nurmi
Cynthia.Nurmi@dot.gov
Phone: 404- 895-0996
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
Louisiana Department of Transportation and Development 2021 $430,000.00 Eddie Legnon Eddie Legnon 225-219-9727 Eddie.legnon@la.gov

Study Description

Study Description

The increase in the amount of available data from Volume 9 to Volume 14, both in the number of stations and their record lengths, could have a considerable effect on precipitation frequency estimates. For stations used in Volume 9, almost a decade of data has accumulated since the completion of the current estimates. Also, many stations that were not retained for analysis in Volume 9 due to short records will be considered for Volume 14.

Objectives

The purpose of this project is to update precipitation frequency estimates for Louisiana that are published in NOAA Atlas 14 Volume 9. Like previous NOAA Atlas 14 volumes, the estimates and associated bounds of 90% confidence intervals will be provided at 30 arc-sec resolution for durations of 5-minute through 60-day at average recurrence intervals (ARIs) of 1-year through 1,000-year. The study results will be published as NOAA Atlas 14 Volume 14, a wholly web based publication available at Precipitation Frequency Data Server (PFDS). The publication will include the artifacts provided in previous NOAA Atlas 14 Volumes, including access through the PFDS, 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 not be developed as a part of this project.

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 - Spatial interpolation and consistency

Task 8 - Temporal distributions

Task 9 - Peer review

Task 10 - Documentation

Task 11 - Final deliverables

Task 12 - Status Reporting

Comments

Multiple entities in Louisiana will contribute to this project, including:

o Office of Community Development (lead agency; OCD)

o Coastal Protection and Restoration Authority

o Department of Transportation and Development

o Office of Homeland Security and Emergency Preparedness

o Department of Wildlife and Fisheries

Subjects: Bridges, Other Structures, and Hydraulics and Hydrology

Title File/Link Type Private
Acceptance Memo FHWA Led - Acceptance Memo TPF 5(477).pdf Memorandum Public
TPF 5(477) Quarterly Report Q2 2021 TPF Quarterly Report Form - Q2 2021.docx Quarterly Progress Report Public
Title File/Link Type Private
Approved Waiver Memo Approval of SPR Waiver Pooled Fund Solicitation#1543.pdf Memorandum Public
Budget Budget Volume 14.docx Other Public
SOW NOAA_SOW_Proposal_Atlas14_LA_20201218.docx Work Plan Public

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