HCFCD to Begin Next Phase of Ben's Branch Clean Out in October

Harris County Flood Control District (HCFCD) and its contractors met today with representatives of Kings Forest, the Bear Branch Trail Association and Kingwood Service Association to discuss the next phase of the Ben’s Branch clean out. On the south, the project lies entirely within the Creekwood Nature Area between Kingwood High School and the old H-E-B shopping center. Rocky Woods Drive forms the northern extent of the project. This will extend northward the work already completed south of Kingwood Drive.

*Project extent outlined in red. Kingwood High School is at bottom center; Town Center on right; Kings Forest on left and Bear Branch at top of frame.*

Maintenance Objective: Restore Conveyance

The objective: to restore conveyance of Ben’s Branch and reduce potential for flooding in Kings Forest, Bear Branch, the Kingwood High School, and Kingwood Town Center.

The ground these men are standing on is all deposited sediment that needs removal to restore conveyance. The original channel bank is the higher slope behind them. The other side has a similar problem.

Sediment has restricted the flow of the channel gradually during the last three decades. It now contributes to flooding.

*Tucked into the tree line on either side of Bens Branch, you can see the maintenance roads that formed the top of the original banks.*

During Harvey, many homes on both sides of the stream flooded. Many also flooded again during Imelda.

Walking along the creek today, the first thing one notices is a craggy channel with sides that seem to have slumped into the stream. Flood control surveys, however, show that is not the case. The channel filled with sediment. Then the stream eroded down again through the accumulated sediment.

Continual cycles of deposition and erosion have clogged, deformed and narrowed the creek.

Approximately 15,000 Cubic Yards of Sediment To Be Removed

Getting the channel back to its original state will require removal of approximately 15,000 cubic yards of sediment. However, engineers have not yet determined the exact number.

The scope of work will include replacement of damaged drain pipes that carry water to the ditch.

The job is still in its planning stages. Actual dirt work should begin sometime in October.

Funded with Help from USDA NRCS

A grant from the USDA Natural Resources Conservation Service (NRCS) will help HCFCD fund the project. Contractors will haul the excavated dirt to nearby TCEQ-approved landfill sites outside of the .02% annual chance (500-year) flood plain.

*Looking north. The project will NOT extend into the natural portion of Ben’s Branch at the top of the frame, near Rocky Woods Drive.* *It will affect only the man-made portion of the channel.*

Downstream, the project will stop at Kingwood Drive. Note below how the channel under the Kingwood Drive bridge is virtually twice as large as the channel in the foreground.

*Looking south over Ben’s Branch toward Kingwood Drive and the portion of Ben’s Branch restored earlier this year. Note how constricted the channel in the foreground is.*

When complete, this project should make the channel north of Kingwood Drive as wide as it is south of Kingwood Drive. It’s all about getting the channel back to its designed carrying capacity.

An exact timetable for the project is not yet available, but it will take several months.

Posted by Bob Rehak on 9/4/2020

1102 Days after Hurricane Harvey

Maintenance Objective: Restore Conveyance

Approximately 15,000 Cubic Yards of Sediment To Be Removed

Funded with Help from USDA NRCS

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