Texas Water Development Board Archives - Page 2 of 2

Earlier this month, the State, Harris County and City of Houston announced the next phase of West Fork mouth bar dredging. Late last week, it got underway in earnest.

*West Fork mouth bar on Monday 1.20.2020 before mechanical dredging started.*

How Mechanical Dredging Works

Rachel Taylor took the ground-level pictures below earlier today from her back yard in Atascocita Point. They show mechanical excavators eating away at the mouth bar and loading the spoils on barges.

*Sunday afternoon, 1.26.2020, two mechanical excavators worked the western end of the mouth bar. They loaded the spoils on waiting barges (right). Photo courtesy of Rachel Lavin Taylor.*

*Service boats then pushed the barges upriver. Photo courtesy of Rachel Lavin Taylor.*

*Barge loaded with spoils passes the Deerwood Country Club.* *Photo courtesy of Rachel Lavin Taylor.*

*Barges then anchor at Berry Madden’s property on the south side of the West Fork opposite River Grove Park.* *That black object jutting into the photo from the lower left is the skid of the helicopter.* *Photo taken 1.20.2020.*

*From there, other trucks move the spoils inland.* *For orientation, that water tower in the upper left is south of Kings Lake Estates.* *Photo taken 1.20.2020.*

Mechanical dredging is slower and more labor intensive than hydraulic dredging, but can mobilize faster. In hydraulic dredging, dredgers pump the spoils to a placement area via pipelines. That is faster, but has higher overhead. It also creates more noise.

Hydraulic Dredging Options

The hydraulic pipelines can stretch miles. In the case of the first phase of West Fork mouth bar dredging, they stretched 10 miles upstream. It took five booster pumps to get the material all that way to a sand mine on Sorters just south of Kingwood Drive.

Luckily for us, the pipe from the first phase of mouth bar dredging is still at the Army Corps dock opposite Forest Cove.

*Pipe from the first phase of mouth bar dredging still sits at the former Army Corps command post and could be rewelded into longer sections if needed.*

*The Great Lakes Dredge also remains at the dock. Here you see the pieces below and behind the crane.*

At some point in this project, dredging may switch from mechanical to hydraulic. The fact that the Great Lakes dredge remained here bodes well. It chewed through 500,000 cubic yards of debris at the West Fork mouth bar in less than three months. Officials expect mechanical dredging of 400,000 cubic yards to take 8 -12 months.

Additional Dredging Targets and Financing

Other targets reportedly include the East Fork Mouth Bar and several mouth bars that have formed at the mouths of ditches or streams leading into the lake.

State Representative Dan Huberty helped bring $30 million to this phase of dredging via an amendment to SB500 in the last legislature. That money will funnel through Harris County via the Texas Water Development Board. The County also included $10 million in the 2018 flood bond. And the City is applying $6 million left over from a FEMA/TDEM grant for debris removal from Harvey.

For more details on this next phase of dredging, see the previous post on this project.

Two Phase Project Outlined In Grant

Harris County’s proposal for the grant from the Texas Water Development Board (TWDB) calls for splitting the project into two phases.

Phase One will focus on the West Fork Mouth Bar using the City’s $6 million and $10 million from the TWDB grant.
Phase Two will focus on the East Fork Mouth Bar using the remaining $20 million from the grant.
The $10 million from the County flood bond will fund surveys, formulation of specs, bidding, project management and more.

Progress Result of Pulling Together

All this is great news for the Lake Houston Area. The entire community worked since Harvey to make this happen through all levels of government.

As we look at other flooding problems in the area, it’s important not to get discouraged and to remember that we can make progress if we all pull together.

Posted by Bob Rehak on 1/26/2020 with photos from Rachel Lavin Taylor

880 Days since Hurricane Harvey

Behind-the-scenes work for the next phase of dredging has already started. The City, County and State are working together on a $30 million grant application for submission this month. The legislature earmarked the money for dredging at the confluence of the San Jacinto and Lake Houston. However, the money must go through the Texas Water Development Board (TWDB) to Harris County and then the Harris County Flood Control District.

Circuitous Route for Funding

The supplemental appropriations bill, SB500, that the legislature approved dictates the circuitous route for funding. See the exact text from SB500 below.

“Out of funds appropriated in Subsection (1), $30 million is dedicated to the Texas Water Development Board to provide a grant to Harris County for the purchase and operation of equipment to remove accumulated siltation and sediment deposits located at the confluence of the San Jacinto River and Lake Houston.”

DIY vs. Outsourcing

State Representative Dan Huberty, who authored the SB500 amendment, has worked closely with all parties involved to explore the most cost-effective and timely solutions. For instance, Flood Control explored how much it would cost to hire an outside company for dredging versus buying the equipment and doing it themselves. Said Huberty, “In my discussion with the TWDB last week, they have agreed we can buy equipment if we need to, which is the direction we are pushing for at this time.” However, that option would take longer to implement and the money must be spent within the current bi-annum – by law.

Long Term vs. Immediate Needs

Meanwhile, the East and West Forks of the San Jacinto have urgent, immediate dredging needs, too. So the partners could break the work up and pursue both DIY and outsourcing options.

Said Huberty, “I met with DRC (Disaster Recovery Corporation) a week ago. DRC has an ongoing contract with both the City and County for debris removal from Lake Houston and they are still removing debris from the lake. So they might be an option that would let us deploy faster.”

DRC is the parent company of Callan Marine, a subcontractor during the Army Corps’ Emergency West Fork Dredging project after Hurricane Harvey.

The dredges are gone but the pipe is not. The quarter-mile long sections of pipe used in the initial Emergency West Fork Dredging Project have been broken down into smaller sections for transport, but much of it remains on the West Fork. *Photo taken 12/3/2019*.

Additional Sources of Funding

Huberty also said that, “In addition to the $30 million, the Houston Mayor Sylvester Turner and Council Member Dave Martin committed last weekend to help us fund this in partnership with Harris County Flood Control.” The City committed approximately $6 million, according to Huberty.

The ever-growing mouth bar on the San Jacinto West Fork. Imelda wiped out many of the gains from the Corps’ supplemental dredging program that ended on Labor Day and removed 500,000 cubic yards. Photo taken on 12/3/2019.

*The growing mouth bar on the East Fork of the San Jacinto near the entrance to Luce Bayou and the Interbasin Transfer Project.*

The Inter-Basin Transfer canal empties into the lower reaches of Luce Bayou, which flows into the northeastern corner of Lake Houston, near the emerging mouth bar. The project costs $351 million and will provide water to the Northeast Purification Plant. Photo taken 12/3/2019.

“In addition,” says Huberty, “I spoke to the Governor’s staff this weekend. We still have money left over from Harvey debris removal. That’s approximately another $16 million. They told us we can spend the money on the river and lake, but not for other purposes. This will let us complete the mouth bar dredging and get mechanical dredging done in areas like Huffman and Atascocita. The scope of the project is expanding, which is very good news. We’ll be able to help more people.”

Smaller mouth bars have set up around the lake at the entrance to drainage ditches, like this one in Atascocita near Walden. Photo taken on 10/4/2019. Such blockages can force water up, out and over the banks into neighborhoods during large rains.

Next Step: Commissioners’ Court Needs to Approve Grant Request

The ball, at this moment, is in Flood Control’s court. Commissioners’ Court must approve all grant requests made by any part of the County. Says Huberty, “There will be an item on the December 17^th Commissioners Court agenda requesting permission from the Court to submit the grant application to TWDB. All parties involved have already had discussions with the TWDB staff and are working on the grant application paperwork.”

Early next week Huberty plans to meet with John Blount, the Harris County Engineer; Stephen Costello, the Mayor’s Flood Czar; and John Sullivan, President of DRC.

Constant Dredging for Foreseeable Future

“In my discussions with all interested parties,” said Huberty, “we should have the application submitted by year end. We have been pushing to get it awarded quickly. It is a formality. We need to spend this money quickly which works to our advantage. We can always go back to the legislature for more after that.”

“All of these initiatives will ensure we can have constant, permanent dredging on the Lake for the foreseeable future,” said Huberty. “I am very pleased with the result and look forward to getting this project started.”

Posted By Bob Rehak on 12/4/2019

827 Days after Hurricane Harvey and 76 since Imelda

Tag Archive for: Texas Water Development Board

Mouth Bar Dredging: First Pictures of Next Phase