Q&A: SJRA General Manager Jace Houston talks Harvey, preventing future floods

Rising floodwaters along the San Jacinto River severely affected some Lake Houston area residents and businesses.

Rising floodwaters along the San Jacinto River severely affected some Lake Houston area residents and businesses.

After an unprecedented release of water from Lake Conroe by the San Jacinto River Authority during Hurricane Harvey, many legislators and residents say the organization exacerbated flooding in the Lake Houston area, especially in Kingwood and various Conroe neighborhoods located along the riverbanks.

SJRA officials said they released more than double the volume of the 1994 floods—the previous high—to return lake levels to 201 feet, which is the level at which the SJRA must begin releasing water. SJRA General Manager Jace Houston discussed the event, classified as a 500-year storm, and potential solutions.

Why wasn’t water released from the Lake Conroe dam before Hurricane Harvey arrived?


No. 1:  We would most likely make their problem worse. If I send water down the river, I’m pre-filling the riverbed. Now, as soon as the rain falls and it hits the creeks and the bayous and the streams and it hits the river, the river has no more room to accept the flow. So the flooding will be faster and the emergency management people will have less time to evacuate people because it will happen more quickly.

No. 2: Because Lake Conroe is so large, I can’t lower [lake levels] more than maybe an inch or two a day without pre-filling the river. The amount I can do without filling the river is maybe an inch a day. Even if I had a five day forecast that was absolutely totally correct, maybe I can move the lake five inches in five days. But five inches isn’t going to help when you’ve got 15 feet of water to deal with. So the thought that pre-release would have any benefit to people downstream is false.

Harris County Judge Ed Emmett discussed turning the Lake Conroe reservoir into a flood control facility in addition to a water supply and recreational area. Do you think it's a good idea?


Because of the severity of all of this flooding, I agree every option should be looked at. I have no problem with considering making part of Lake Houston and part of Lake Conroe into flood control facilities. We ought to study all of the options. However, there are really significant consequences to taking any of the state’s water supply reservoirs and converting them into flood storage.

If you lower the level, a portion of that goes away and you have to replace it with water from somewhere else because the state of Texas is already short on water supply. We already don’t have enough water to meet the future demands of the state, including the Greater Houston region. That would mean we would have to immediately turn around and start making plans for how we’re going to replace that lost water supply. That’s potentially hundreds of millions of dollars.

There has to be a study. There’s going to need to be a tremendous stakeholder input on the pros and cons of converting Lake Houston or Lake Conroe into flood storage. You’re going to have to look at what the economic consequences of doing that are, in terms of replacing water supply and in terms of the impact to the area around Lake Conroe. It would have a negative impact on property values around Lake Conroe, a negative impact on sales tax and property tax revenue.

Is there any way to know if projects at Lake Houston would be more beneficial to preventing flooding?


One of the rules of thumb in the water supply business is you basically start your planning at the top of the basin because you want to start your water supply as high up the hill as you possibly can. But in the flood business, you start your planning at the bottom of the hill.

What if I did a bunch of improvements in Spring Creek or Lake Creek so that water would flow faster down the river, but I haven’t done anything to Lake Houston. I made their problem worse because I made water get there faster.

You’ve got to think about Lake Houston. Is there a way that I can get water out of Lake Houston faster and if there is, would it help? That needs to be looked at. Can we get the water out of Lake Houston faster so that it doesn’t back up when the water is coming down? Because remember there are no dams. Lake Conroe is the only dam in the entire San Jacinto River Basin.

All these other tributaries that contribute 85-90 percent of the flow that reaches Lake Houston, they’re uncontrolled. It’s coming whether you want it or not. So you either have to build flood control reservoirs on those other creeks or you have to go to Lake Houston and figure out how to get [water] out of the lake faster.

Leaders in the Lake Houston area are proposing that the SJRA lower the standing water level at Lake Conroe from 201 feet to 198 feet.


We don’t set that. The state of Texas sets that. It’s set at 201.

During speeches Houston city councilman Dave Martin said the level was raised to 201 from 198 feet after the drought in 2011.


No. The level has always been 201 since Lake Conroe was constructed.

What would it mean for the people who live around Lake Conroe if the water level was dropped three feet?


The way reservoirs are designed is the state of Texas allows you to take a certain amount out each year. [It's based on] if you go through a seven-year long drought, at the end of the seven years your reservoir would be empty.  If you lowered the level—instead of starting at 201 you’re starting at some lower amount, then they’ll have to lower that amount that you can take each year and still make it through a seven-year drought.

Right now it’s a 100,000 acre-feet per year. But they would lower the amount of water we’re allowed to use each year. We’re not using the full amount yet anyway. We don’t have enough population to need the full amount. It wouldn’t be a water supply problem tomorrow or the next year. It’s more of a long term issue. It means we would have to go and develop a long-term supply for our future water supply for the region. Not just for Montgomery County. That lake serves the entire region.

The other problem is you’re talking about the you’re talking about the water level being three feet lower than its normal level. For Lake Conroe it’s a pretty shallow lake. When the Lake gets 2 or 2.5 feet below normal you get coves and areas around the Lake where the bottom of the reservoir is starting to show, and it’s too shallow for boats. It impacts people’s ability to use the lake for recreational purposes.

If there were three more feet of capacity would the SJRA have been able to hold water longer in Lake Conroe and released it slower?


That’s the bigger question to me. The thing you have to talk about is would it even help to lower the lake 3 feet. If we know there are consequences to lowering the lake 3 feet then we can estimate a dollar amount for that.

But if it’s not going to reduce flooding then why would you do it?

If it would have eliminated all flooding then it might be worth a few hundred million dollars. Here’s the problem. In Harvey we passed through the gates over 15 feet of lake level—that’s how much water came through Lake Conroe. So if we had started that event three feet lower it really doesn’t change—it would delay the release of water a little bit. I don’t know by how much, but you’ve still got 12 feet of water that you’ve got to deal with and pass through the dam. You’re still going to have a large release of water.

In a really large event like Harvey it doesn’t make a big difference. We could capture a lot of water. So if it’s a 100-year storm event or like the tax day floods from last year… maybe in a smaller event like that it would have an impact on reducing how much we have to release, but in a Harvey event it doesn’t make that big of a difference.

And here’s the other thing. If it’s a Kingwood resident, we are only 10-15 percent of the water that gets to Lake Houston anyway. Even if Lake Conroe had been empty and had not released a drop of water in Hurricane Harvey, they would still have 85-90 percent of the water that they got.

Lake Conroe didn’t cause their flooding. We are a small percentage of their flooding.

 

What would be the impact of dredging the San Jacinto River and Lake Houston?


I really don’t know what the impact of dredging might be because the siltation over the last several decades has definitely changed the shape and the way water flows through the upper part of the lake and the lower part of the river.

 


MOST RECENT

Houston City Council passed a tax rate Oct. 21 of $0.56184 per $100 valuation for fiscal year 2020-21, a 1.07% reduction from the previous year’s tax rate of $0.56792 per $100 valuation. (Courtesy Fotolia)
Houston approves lower tax rate for fiscal year 2020-21 amid calls for further reductions

The rate may still result in an increase for some taxpayers with the average homestead property value rising about 4%.

The Harris County Flood Control District hosted a virtual public meeting on Oct. 20 to outline the findings from its $700,000 Kingwood Drainage Analysis. (Kelly Schafler/Community Impact Newspaper)
Study: Kingwood Diversion Ditch, Taylor Gully projects could remove 449 structures from flow paths of 100-year storm

All nine projects would cost roughly $148.35 million for construction, detention and land acquisition.

Target has built out its new store at 2075 Westheimer Road, Houston. (Matt Dulin/Community Impact Newspaper)
Target to open fourth Inner Loop location and more Houston-area business, community news

Read the latest business and community news from the Houston area.

Baylor College of Medicine is seeking volunteers for a COVID-19 study looking to determine the prevalence of the viral disease in the Houston area. (Courtesy Baylor College of Medicine)
Baylor College of Medicine recruiting participants for COVID-19 prevalence study

The study will collect samples from 70,000 individuals nationwide.

Hurricane Harvey hit the Houston region in 2017. (Vanessa Holt/Community Impact Newspaper)
Q&A: Houston hydrologist explains climate change’s role in intensified flooding, importance of planning for future storms

“We’re looking at more intense and more frequent storms, and so, as a region, we’re going to need to think about that when we’re planning. We need to plan for that worst-case climate change [scenario].”

Some Harris County residents could be eligible for free workforce training. (Courtesy Lone Star College System)
Harris County partners with Lone Star College to offer free workforce training this fall

Furloughed, unemployed and underemployed Harris County residents could be eligible for one of 17 training programs.

University of St. Thomas President Richard Ludwick cuts the ribbon for the new microcampus Oct. 20. (Eva Vigh/Community Impact Newspaper)
University of St. Thomas celebrates grand opening of microcampus in Conroe

The center is named after St. Maximilian Kolbe, who is often referred to as the patron saint of innovation.

(Community Impact Newspaper staff)
Greater Houston region faces glut of industrial, commercial space and multifamily housing

While the Greater Houston area has seen a glut of office space for the last six years, Patrick Jankowski said the industrial buildup has happened more in the past year and a half.

The North Houston Highway Improvement Project proposes rerouting I-45 through the East End and Fifth Ward and expanding it through the Northside. (Nathan Colbert/Community Impact Newspaper)
Houston-Galveston Area Council seeking feedback on I-45 project plans

Regional leaders are accepting feedback on which projects to fund alongside the I-45 overhaul.

New Caney ISD welcomed 600 students who were previously learning remotely to campus after fall break. (Courtesy Adobe Stock)
About 600 New Caney ISD students switch to on-campus instruction at end of 9 weeks

As New Caney ISD returns to school after fall break, about 600 students have switched from remote learning to on campus, according to Executive Director of Instruction Kristi Shofner.

Mickey Deison speaks at a city event. (Courtesy Larry Foerster)
Community remembers legacy of Mickey Deison, former Conroe mayor and Montgomery County judge

“He did what was needed to be done, not for any self-glory,” Larry Foerster said.

Montgomery County's COVID-19 recoveries sit at 8,403, according to the county health department. (Community Impact Newspaper staff)
See Montgomery County's weekly COVID-19 case count for Oct. 13-19

The county has made progress on its backlog of cases initially reported to the Texas Department of State Health Services by health care providers.