Tag Archive for: San Jacinto River Authority

Log Jam Finally Broken on Long-Awaited Regional San Jacinto River Basin Study

In March last year, the San Jacinto River Authority, City of Houston, Montgomery County and Harris County proposed a river basin study of the San Jacinto.

Scope of River Basin Study

The scope includes evaluating the cost effectiveness and feasibility of a variety of flood mitigation projects. They include additional gates for the Lake Houston Dam, additional dredging and additional upstream detention – all important for the Lake Houston Area.

West Fork Sand Mine Complex inundated by Harvey.

But the scope also includes many other potential projects. The $2+ million grant request to FEMA covered the entire San Jacinto River basin including the East and West Forks.

10 Months of Delays

Then the grant request fell into a great black hole. Nine months went by while FEMA pondered and tweaked the 15-page grant application. Finally, FEMA was ready to write the check in December…when the government shut down.

Finally, a Green Light

Today, however, I got news that FEMA finally green-lighted the project through TDEM, the Texas Division of Emergency Management. TDEM coordinates all FEMA requests for the State of Texas.

This will benefit multiple counties throughout entire basin. It’s not often this many governmental entities come together to impact an area this large.

Residents trying to escape as Harvey's floodwaters rose
Residents of Kingwood Village Estates trying to escape as Harvey’s floodwaters rose. 12 residents died as a result of injuries sustained during evacuation or the stress from losing their homes.

All parties have reportedly signed inter-local agreements (ILAs) already. An ILA is like a contract between governmental entities.

Next Steps Before Kickoff

Next steps: Harris County Flood Control will present details of the grant package to Harris County Commissioners Court at the Court’s Feb 12th meeting.

Following court acceptance of the grant, HCFCD hopes to obtain Commissioner’s Court approval of the agreement with the consulting firms that will execute the river basin study. 

All those involved hope for an official study kickoff in late February/early March.

Among many other things, study will examine sedimentation and its role in flooding.

For More Information

Harris County Flood Control is currently working to update its website. When additional information becomes available later this week, you will be able to view it at: https://www.hcfcd.org/hurricane-harvey/hurricane-harvey-kingwood-information/upper-san-jacinto-river-regional-watershed-flood-mitigation-plan/

Study to Take 18 Months

Originally, the study was to have taken approximately a year. However, additional FEMA requirements mean it will now take 18 months. That means we should be looking at recommendations 3 years after Harvey. Then the partners will submit additional grants to FEMA for projects that result from the study.

See my previous editorial comments about the state of disaster mitigation. “Time is the enemy of disaster mitigation”. You can quote me on that.

Posted by Bob Rehak on January 29, 2019

518 Days after Hurricane Harvey

Seasonal Lowering of Lake Conroe Begins August 1

On August 1, the City of Houston Public Works Department, the San Jacinto River Authority (SJRA) and the Coastal Water Authority (CWA) plan to begin lowering the level of Lake Conroe as part of a joint operations plan to mitigate flooding threats during the peak of hurricane season. The plan calls for lowering Lake Conroe gradually through small releases – about an inch a day – until the lake level reaches 199 msl (mean feet above sea level).

Intent of gradual lowering of Lake Conroe is to avoid another 79,000 cubic-feet-per-second release rate as we experienced during Harvey. Until normal flow is restored to the West Fork, Lake Conroe will be lowered temporarily and seasonally to mitigate flood risk.

Lake Conroe to Be Lowered 2 Feet Through September

This initial lowering will last through the end of September to create additional storage in Lake Conroe which could delay releases and minimize release rates during a storm, thereby providing a buffer against flooding for residents who live downstream of the dam.

The next lowering would occur during the peak of the spring rainy season – from April 1 – May 31, 2019. However, that lowering would only be by a foot – to 200 msl, because the rain threat is usually lower in spring.

Only Until Dredging Restores River’s Flow

The joint operations plan calls for continuing to lower Lake Conroe seasonally in this manner while the U.S. Army Corps of Engineers dredges the West Fork of the San Jacinto to restore flow.

Hurricane Harvey deposited tremendous amounts of silt in the West Fork which  physically changed the river’s ability to safely pass water during storms. Hence, the dredging.

Phase-One Dredging Has Already Started

Phase one will go from River Grove Park to the West Lake Houston Parkway bridge. Great Lakes, the contractor hired by the Corps, has 269 more days to complete the initial phase.

Phase-Two Still Needs Funding

The total project could take longer. Community leaders are now working furiously to arrange funding to dredge the remainder of the west fork, including the mouth bar.

Mobilization and demobilization comprise 25 percent of the total phase one project costs (approximately $18 million out of almost $70 million). Having phase two ready to start before phase one ends could save that money, creating extra value for taxpayers and enabling even more dredging, say for instance, on the East Fork.

Temporary Lake Conroe Lowering Could Last Up to 3 Years

The City, SJRA, and CWA will continue the seasonal lowerings for up to three three years. They will monitor progress of the dredging and annually re-evaluate the need to lower Lake Conroe. If the river’s flow is restored before three years, the temporary lowering would cease.

Lakes will Operate under Two Different Strategies

LAKE CONROE
Lake Conroe is located upstream from Lake Houston. Large pre-releases immediately before a storm run the risk of pushing water into Lake Houston at a rate that could flood residents. Therefore, the SJRA will release at a much more gradual, controlled rate and maintain the lower level until the largest flood threat passes.

LAKE HOUSTON
Lake Houston, as the lowest lake on the river system, can pre-release more safely. Therefore CWA will pre-release from Lake Houston if the National Weather Service predicts more than 3 inches of rain within the San Jacinto River basin in a 48-hour period. Coastal Water Authority will lower Lake Houston to 41.5 feet from its normal elevation of 42.5 feet.

To track lake levels visit:

  • Lake Conroe – www.sjra.net
  • Lake Houston – www.coastalwaterauthority.org

4 Million People Depend on City for Water

Lake Conroe and Lake Houston comprise two of the largest parts of the City’s drinking water system. More than 4 million Houstonians and residents of the greater Houston region rely on water provided by the City.

Posted by Bob Rehak on July 30, 2018

335 Days since Hurricane Harvey

Need for Sediment Management Planning

Sand and sediment clog our rivers and lake. “Dredge!” you say.

“Not that simple,” say the experts. “Who will pay for it? How much should we dredge? Where will the sediment go?”

That’s why we need planning for sediment management. We need to dredge the worst parts of the river now; the U.S. Army Corps of Engineers (USACE) has already started that as an emergency project. But we also need to dredge other parts of the river that are not quite critical yet. And we need to figure out how to do all this on a regular basis so that it never gets this bad again.

A giant sand dune has formed at the mouth of the west fork of the San Jacinto. It is not being addressed by the Army Corps dredging project but should be. Thousands of homes upstream from this massive blockage flooded during Harvey.

Sediment Management Challenges That Lie Ahead

I have talked about these issues with experts from Harris County Flood Control and USACE. Both say planning is crucial to a successful maintenance dredging/sediment management program. One provided this document: Galveston-Bay-Programmatic-RSM-Plan-Rev-1, as an example of what we need for the San Jacinto. It’s a long document – 112 pages. But it is worth reading the executive summary, introduction and table of contents at the very least. Parts of it discuss the upper reaches of the San Jacinto. But the main value it provides is that it outlines the challenges ahead.

  •  Who will lead the effort? Who will support it?
  • How much money is needed per year? How can we budget for it? Who will share in the costs?
  • Where will the dredged materials go? How can we identify opportunities to reuse and sell them? Who will market them and how? To what extent can sales defray dredging costs?
  • What are the true life-cycle costs of the sand and sediment that miners send downstream to us?
  • How can we reduce their contribution to the problem? Is there a way to make them part of the solution?
  • How can we coordinate upstream and downstream efforts so that the entire river system flows freely?
  • How can we remove channel blockages more quickly after floods to help prevent additional flooding?

All of these are difficult questions. Starting such an extensive program is like starting a new business.

Budgeting Comes First

A business plan and budgeting are the first issues we need to address. Where will the money for all this come from? Without answering that first, everything else is moot.

So who are the stakeholders?

  • City of Houston – Ensuring the future of Lake Houston is essential to ensuring the future of the City. It’s the City’s main source of water.
  • Harris County Flood Control – Half of the people that live in the county, live in the City.
  • San Jacinto River Authority (SJRA) – The State created the Authority back in the 1930s to impound water and protect people from flooding. Those missions were recently reconfirmed by the Governor.
  • Coastal Water Authority – CWA is the contract operator for Lake Houston Dam and Reservoir. They sell water just like SJRA and can raise money thru water rates to fund flood mitigation. Their enabling legislation mentions drainage and flood responsibilities – same as SJRA.
  • State of Texas – This region has a quarter of all the people who live in the state. Nuff said.

Expecting all costs to be covered by the Harris County Flood Bond in perpetuity is just wishful and foolish thinking. The bond is for capital projects, not ongoing maintenance. You might be able to justify the first dredging as “channel improvements.” But after that, for the sake of the community, we need to find a way to make this program sustainable. Paying interest for ongoing operations is unwise.

Cost Sharing and 5-Year Intervals Can Make It More Doable than Avoidable

In 2000 Brown & Root, recommended dredging every 5 years – a perfect match for a venture with five partners. If each budgeted one fifth of the cost annually, and you did only one fifth of the job each year, this just might be more doable than avoidable. (Avoidance seems to have been the preferred approach in the past.)

We can’t budget sediment management forever on an emergency basis. That’s like using an emergency room for basic medical care. It’s probably not the best idea, nor the most cost effective. So let’s begin the dialog with stakeholders. As Grandma used to say, “An ounce of prevention…”

Posted on July 13, 2018 by Bob Rehak

318 Days since Hurricane Harvey