City of Austin Performance Report 2014-15
Linear Feet of Storm Drain Infrastructure Installed or Replaced
This measure reflects all new storm drain infrastructure installed and existing storm drain infrastructure repaired by the Field Operations Division, and installation via capital improvement projects sponsored by the Watershed Engineering Division.
Austin's stormwater infrastructure includes approximately 1,100 miles of storm drain lines. The Department estimates that more than 15% of these pipelines are more than 60 years old. Existing storm water lines in the urban core are a particular source of problems as these lines are subject to more intense pressure for urban infill development and redevelopment, which may compound problems with pipeline conveyance capacity. Some pipelines have become outdated through changes in design criteria, have exceeded their anticipated service life, and/or have become structurally compromised. Failure of the structural integrity or function of a storm water system in any part of the City poses the risk of flooding in the affected area.
To calculate this measure, at the completion of localized flooding hazard mitigation projects, design plans are used to total the feet of storm drain infrastructure installed or replaced. For larger projects that span multiple years, the last paid project payment application of a fiscal year is used to determine the number of linear feet that have been installed and paid for by the City of Austin.
FY 2014-15 Results
The FY 2014-15 goal for this measure was 5,000 linear feet of storm drain infrastructure installed or replaced. The actual total was significantly less at 2,181 linear feet installed or replaced.
Assessment of Results
The actual linear footage of storm drain pipe installed or rehabilitated was significantly less than anticipated for FY 2014-15. Several storm drain capital improvement projects were in the design phase or preliminary engineering assessment phases during the year. The availability of Field Operations staff to proceed with planned construction work was affected by flooding events impacting the city in the months of May and June 2015. Staff resources were reallocated from use on planned work, such as the Euclid Wilson Storm Drain Improvement project, to respond to emergency work pertaining to failed storm drain infrastructure. During the year staff successfully partnered with other departments to include approximately 1,199 linear feet of storm drain pipe and associated infrastructure as emergency work into an existing capital improvement project in the Pemberton Heights neighborhood.
The Watershed Protection Department continues to identify problem areas and analyze potential solutions using in-house staff and consultant-led designs. The Localized Flood Hazard Mitigation Program will continue to focus on improving aged and inadequate drainage systems throughout the City. Many of the infrastructure replacements will continue to address flooding impacts; however, aging infrastructure will also require replacements.
For more information contact Mapi Vigil, PE of Watershed Engineering Division at (512) 974-3384.