F-22 Restore Channel Conveyance Capacity on Pillot Gully

F-22 Restore Channel Conveyance Capacity on Pillot Gully

Last Modified: 02/08/2021 05:24 PM

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UPDATE posted February 5, 2021, revised February 23, 2021:

Phase 1 construction of this project was completed in mid-December 2020, downstream (south) from Vintage Preserve Parkway. Slopes and banks along this 2,830-foot-long area have been seeded with turf species to help stabilize the newly restored slopes and prevent future erosion. A second smaller phase, which includes erosion repair along a 150-foot area just downstream of the first phase, began in late February 2021 and is expected to take approximately 30 days. As mentioned previously, there will be additional tree clearing and temporary trail closures necessary in connection with Phase 2 construction.

Damage caused by 2020 rain events and the addition of a second phase of erosion repairs has impacted the overall project schedule. That schedule includes a one-year, post-construction warranty period to ensure construction contractor compliance with project specifications. To protect newly constructed slopes and give the sandy soil time to stabilize with newly planted turf, major tree reforestation efforts – which are expected to include tree spading as well as planting, and which will require the use of trucks and other heavy equipment – will take place during the 2021-22 planting season, after the initial warranty period ends in December 2021.

Smaller tree planting efforts using hand tools will not disturb the newly repaired slopes and may proceed.

Recent Actions

January 26, 2021 - Harris County Commissioners Court approved a contract change adding 31 calendar days and $423,552 to the construction contract amount for this project.

October 27, 2020 - Harris County Commissioners Court authorized the Flood Control District to negotiate an agreement for design, bidding, and construction phase engineering services to replace a destroyed concrete spillway and related channel repairs in support of this project.

September 29, 2020 – Harris County Commissioners Court authorized a change in contract to add 74 calendar days and no additional funds for construction services in support of this project.

August 25, 2020 – Harris County Commissioners Court authorized a change in contract to add 19 calendar days and no additional funds for construction services in support of this project.

August 11, 2020 – Harris County Commissioners Court approved an additional $90,840 for construction activities.

May 19, 2020 - Harris County Commissioners Court approved updates to project details in the 2018 Bond Program List. Update changes funding details to reflect engineers estimate and pending construction bid.

April 28, 2020 - Harris County Commissioners Court authorized an additional $60,737 for construction of this project.

Project Description

K140-00-00-X023 is a major maintenance project that will repair a structure failure and integrate environmental enhancements by way of natural stable channel design techniques to restore the channel conveyance capacity of K140-00-00 between Vintage Preserve Parkway and Cypress Creek.

K140-00-00-X023 is not a flood damage reduction project; however, the channel will be widened in some locations and look significantly different once complete due to the anticipated environmental enhancements. The plans call for natural stable channel design features such as:

  • Constructed Boulder Riffles
  • Natural Sill Logs (to help stabilize the banks)
  • Toewood (to help prevent erosion)
  • Live stakes and planting of native vegetation

Portions of the channel are considered to be in serious failure and these repairs are necessary to prevent further impact to the channel and surrounding trail system. On-site sourced wood is expected to be used for channel stability and the Flood Control District is committed to minimize impacts to the trees and vegetation in the area.

For public safety reasons, Kickerillo-Mischer Preserve Park users can expect intermittent trail closures as the project progresses. Phase I was completed in December 2020, and Phase II began in February 2021. Additionally, portions of the foot paths along Pillot Gully and Kickerillo-Mischer Preserve Park may be closed due to construction activities and to help protect project staging areas.

The project contractor will access this project from Vintage Preserve Parkway and the anticipated traffic control plan may result in impacts to traffic around the Vintage Preserve Parkway bridge over Pillot Gully for the duration of this project.

Once construction has been completed, a significant tree planting effort will accompany this project. At a public meeting in April 2019, the Flood Control District shared that tree impacts would be minimal in the project area. However, in addition to the repair of the bottom of the natural channel, it became necessary to repair the eroded side slopes of the channel all the way up to the high bank, and additional space within the right-of-way was needed to implement the project, resulting in a need to remove more trees. Also, after rain events in 2020, a smaller area downstream of the original project area was found to have significant erosion and was added to the repair contract.

While the Flood Control District is working to protect as many existing trees as possible, some additional tree loss during or after construction work is possible. The reforestation plan is currently being drafted and will be shared once completed. The Flood Control District will plant a mixture of native hardwood and pine trees along the channel with a density of up to 300 trees planted per acre. Additionally, larger trees up to 20 feet tall may be relocated to and planted along the high bank and trail areas in order to re-establish the forested canopy more quickly. Construction is expected to be complete in early 2021. Reforestation will follow construction and turf establishment.

Stage

This project is currently in the CONSTRUCTION stage.

Bond Project Listing

Project F-22 is categorized as a “Local Only” bond project. This means there is no other funding partner at this time and total project costs are expected to be paid with bond funding. The Bond Project List includes a total allocation for this project of $2.2 million.

Bond Listing

List of 2018 Bond Projects

The Harris County Flood Control District has a significant number of flood damage reduction projects occurring all over Harris County as part of its on-going Capital Improvement Program (CIP), Operations and Maintenance, and the 2018 Bond Program. Click the Project ID on the Map to learn about projects’ details. Some early-stage projects are not highlighted on the map. The map will be updated when projects advance or when more information becomes available.

Project Lifecycle

Every flood damage reduction project is unique. Yet each project begins and ends, with common and predictable milestones along the way. Whether a project moves forward – and how quickly – depends on many factors, including the availability of funding at each milestone, shifting community priorities for flood damage reduction, and other changing circumstances (such as the price of trees or concrete) from year to year.

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COMMUNITY ENGAGEMENT MEETING

A Community Engagement meeting for this project was held on April 29, 2019