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Public Safety

Goal 2: Mitigate Flood Risks and Protect Stormwater Infrastructure
Objective 2: Complete Watershed Studies for Each Watershed within the City
Project Performance Measure(s) City Service Team (Department)
Core Watershed Studies Achieve FEMA acceptance of all Economic Development and Capital
PS watershed studies by the end of FY Investment (PWT)
2.2.1 2021
Summary:
Milestone Estimated Actual
Comprehensive watershed studies are important to Completion Completion
evaluate current and future flood risk and identify problem Task 1 Nov. 2020 May 2021
areas that will guide the stormwater program. These Task 2 Mar. 2021
watershed studies: Task 3 Dec. 2021 Sept. 2021
 Update the hydrology for current developed
conditions
 Update the hydraulic models based on the new
flows and current creek conditions
 Identify and prioritize problem areas and
generate conceptual solutions for these areas
 Assess the stream bank conditions for erosion
 Update the Flood Insurance Rate Maps based on
the new information

This data benefits the citizens of Arlington by informing
them of the flood risk for their homes, so they can take
protective action. It also identifies flood protection projects
to be incorporated into the Stormwater Capital
Improvement Plan. Arlington's nine major watersheds have
been grouped into six major study areas. The Stormwater
Division plans to include watershed studies in its budget
each year until all the major watersheds in the City have
been studied. Update:
Task 2: This task is delayed until the Engineering
This project will strategically plan mitigation tasks to Technician and Stormwater Asset Analyst vacancies are
proactively rectify deficiencies identified in the watershed filled.
studies completed in FY 2019. During FY 2021, work will be
concentrated on the following three tasks: Task 3: Floodplain Administration staff mailed out the
 Task 1: Create geodatabase based on flood FEMA PMR post card notifications to residents in the Rush
hazard depths and HAZUS data in the 5‐year Creek Watershed in September 2021. This post card
buyout plan. provided instructions to the appeal process and
 Task 2: Develop an erosion field inspection information on flood insurance.
directive to effectively create an OCI to prioritize
projects and to determine potential failures. A link to the City’s interactive map for the FEMA PMR data
 Task 3: Provide community outreach for all FEMA is accessible to residents for review.
approved LOMR data to be included in FEMA’s
PMRs. City Stormwater staff is in the process of assisting citizens
on questions about upcoming changes to the Rush Creek
watershed. The tentative end date for the 90‐day period
notification is October 30, 2021.

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