Improving building codes to mandate higher home elevations
Requiring greater setbacks from rivers, streams and bayous
De-snagging to prevent log-jams from backing water up
Preserving wetlands, grasslands and forests to absorb and slow runoff, and to create recreational opportunities for nearby homeowners
Bio-swales and ditches to create more stormwater storage and positive drainage around homes
Buying out flood-prone homes and converting the property to recreational or flood-mitigation space.
I’m sure more techniques exist. But those represent the big categories.
Complex Decisions Involving Many Factors
No one tool works for all situations. And many of the tools that reduce flood risk fly in the face of other human values. They may conflict with other values beyond safety, that we hold dear. Consider, for instance, property rights, individual freedom, job formation, expanding the tax base, a desire to live near water, and risk-taking.
So how do professionals decide which tools to apply where and when?
Again, it depends on a number of factors. To name a few:
Is State or Federal disaster-mitigation aid available?
Is Disaster Relief aid available?
Homeowner Inquiry Prompted Exploration
A homeowner reacted to one of my posts today. She lives in a low-lying area near FM1485 and the San Jacinto East Fork. It flooded badly on May2, 2024. She was certain that dredging and tree removal from the East Fork would help. But after investigating the area online, then from the ground and air, I wasn’t sure.
The normal river elevation in that area is 47.25 feet.
But on May 2, the river rose to 77.4 feet – 17 feet above the top of the river banks and 30 feet above normal!
Jeff Lindner, Harris County Meteorologist, had this to say about the May flood. “Since 1994, this was the second highest crest of the river at FM 1485. It exceeded Tropical Storm Imelda by 4.0 ft and the October 1994 flood by 1.0 ft.”
Lindner continued, “The flood of record remains Harvey which was 4.0 ft higher than the May 2024 event. The river exceeded the .2% (500-yr) exceedance probability elevation at the FM 1485 bridge by 1.5 ft. The table below shows the top five highest peaks on the East Fork of the San Jacinto River since 1994 at that location.”
Residents in this neighborhood experienced five 100-year-or-greater floods in 20 years. That’s one every four years. Is the risk 1% or 25% per year?
See the FEMA floodplain map below for the area in question.
It shows you how difficult flood prediction can be. It also shows you why even nature lovers should give water in Texas a wide berth unless they are prepared to lose everything. The May flood wasn’t even related to a tropical event!
Yellow/green diagonal line is the Harris/Montgomery County line. Image shows neighborhood S of FM1485 near East Fork. Crosshatch=floodway, Aqua=100-year and Tan=500 year floodplain.
Unfortunately, most of the homes in this neighborhood didn’t look like people could afford to lose everything. And I saw several that had been totally obliterated along with two roads that washed out.
I’m not sure what this was. But it was the only structure semi-standing for blocks around.
Professionals Say Buyouts Best Option In This Case, But…
In an area like this, flood-mitigation professionals have few good options. Given the depth of flooding, three professionals told me that intervention would have to be on a massive and costly scale to make a difference. As a result, each suggested buyouts as the best, most cost-effective alternative in this area.
Shortly after the May event, I interviewed a young couple named Daniel and Kathleen Moore. They lived on some of the highest land in the subdivision, but had flooded three times in the seven years that they owned their home (Harvey, Imelda, and May 2024).
They were hoping for a buyout. I called again today to see if they succeeded, but they were selling their property and moving out of state with their new baby. Why?
While Daniel was restoring the home, someone burned it to the ground on July 28th. Nothing stands there now but a charred chimney.
This was a heartbreaking story that deeply affected me personally. I once lived in a home near a creek that flooded frequently when I had two young babies.
While buyouts may sometimes be the most cost-effective option, they are not easy, according to a County Emergency Management Director that I interviewed. Counties must apply for FEMA buyout money and then it can take years to evaluate and rank all the applications and distribute the money.
Forest Cove buyouts took five years after Harvey to complete.
Ironically, the fact that the Moore’s were in a 500-year floodplain may have hurt their buyout chances. FEMA likes money to go to homes that are insured but which flood frequently.
So What About Dredging and Tree Removal?
The Moore’s lived in Montgomery County. But the other family that contacted me lived on the Harris side of the county line in the same neighborhood.
Typical scene in East Fork south of FM1485Area has trees down everywhere.
Experts I talked to suggested dredging wouldn’t make an appreciable difference given the narrow width of the river channel and the height of flooding. Plus, it could undermine more trees along the heavily wooded banks.
Removing trees that have already fallen, they say, is a good idea. They could float downstream, form log dams that flood other homes, and/or harm boaters in Lake Houston. But who is responsible for removing them?
I asked Matt Barrett, head of SJRA’s Flood Management Division. Said Barrett, “SJRA’s jurisdiction does not include Harris County, so projects constructed in Harris County would have to be led by HCFCD.”
Distant Chances for Other Flood Mitigation
That said, Barrett also volunteered that SJRA has partnerships with both HCFCD and the City of Houston. The entities work together on multiple projects from the San Jacinto River Basin Master Drainage Plan. But finding funding remains a challenge. And large scale projects are not quick to implement.
That brings us full circle to the original question in the headline. What was or is the best thing(s) homeowners can do to reduce their flooding chances? In my opinion:
Avoid buying property near water if you have a flooding concern
I’m not a professional engineer and I do not render professional engineering opinions. But I have interviewed a lot of flood victims who wish they could turn back the hands of time and build on higher ground.
Foundation being endangered by riverbank erosion.
If you have the slightest qualms about flooding when purchasing property, make sure you consult a professional engineer to evaluate your risk and mitigation options.
Posted by Bob Rehak on 8/20/24
2548 Days since Hurricane Harvey
The thoughts expressed in this post represent opinions on matters of public concern and safety. They are protected by the First Amendment of the US Constitution and the Anti-SLAPP Statute of the Great State of Texas.
https://i0.wp.com/reduceflooding.com/wp-content/uploads/2024/08/20240820-DJI_20240820122419_0652_D.jpg?fit=1100%2C619&ssl=16191100adminadmin2024-08-20 19:27:412024-08-20 20:02:13What Can Be Done to Reduce Flood Risk?
8/18/24 – The sequence and timing of upcoming construction steps for the Northpark Drive Expansion Project is changing. Project Manager Ralph De Leon wants the public to know what will change, why and when between now and the end of the year.
All parties involved in the construction met last week and agreed to the plan outlined below. However, De Leon warned that it could still change. The new plan will start within the next two to three weeks. The steps outlined below should be substantially completed by December.
Unfortunately, they could involve fewer lanes for a period a time and will cause a total closure of Northpark for three days. The original plan kept two lanes of traffic open in both directions at all times. But that is no longer possible.
Reason for Changes
Due to highly publicized delays caused by utility conflicts, project planners started building pieces of the project out of sequence to keep crews busy.
“We are now out of sequence globally,” said De Leon. “That will never change. So throw out everything you knew in the past. We will publish a new schedule this week or next.”
A complex series of signal changes for traffic, railroad and pedestrian crossings also contributes to the schedule changes. And they will need to be built twice: once for temporary traffic and again for permanent traffic.
Electronics are driving the new Northpark construction sequence more than concrete at this point, according to De Leon. “Boring and installing communication cables to temporary, then permanent signals is the difficult part,” he said.
The schedule changes will not affect what is being built, just when. Nothing has changed regarding the goals. Additional lanes and the planned bridge over 494 and the railroad will still be built.
New Sequence Affects Planned West- and Eastbound Feeder Roads
This new Northpark construction sequence affects how and when the west- and eastbound feeder roads will be constructed. The old plan called for both to be constructed at the same time.
Then traffic was to have been rerouted to the new feeders while contractors demolished the middle. However, that is no longer viable as you can see from photos below.
Instead, Harper Brothers will construct eastbound feeder roads on the south side as they place culverts west to east along the north side. They will start at the Shell station on the northwest corner of Loop 494 and Northpark and work their way down to the area by the Quick Quack Car Wash.
De Leon’s goal is to keep the existing at-grade railroad crossing intact and use that for west bound traffic. The new feeder road on the south side will handle eastbound traffic.
However, that could still change. “We could have to switch everybody (both directions) to the new feeder road. That would mean a single lane for both east- and westbound traffic until the second westbound feeder road is constructed on the north side.”
Pictures Taken Friday 8/17/24
Looking W at Northpark Expansion Project. Previously, planners hoped to install drainage east to west. Now they will move west to east to accommodate UnionPacific which must reroute traffic during its busy season. Still looking west over 494. Contractors are already beginning to work on drainage that will go under 494 and the railroad tracks. Looking east. Two more feeder lanes will be built for east bound traffic south of Northpark.
UPRR will construct a crane on top of the rail tracks needed to install 200 feet of track panel. For that to happen they must rip out the existing rail tracks and reroute all traffic to rail lines that parallel the Hardy Tollroad.
The panel is in a single section that will stretch across ten lanes. UPRR needs that for track stability. However, its length will mean totally closing Northpark for three days.
Still looking east toward Russell Palmer and Kingwood Diversion Ditch. Crews have finished installing culvert and are now building up the center. To see how high, look at the height of manhole covers already installed.
While painful now, when finished, this project will give Kingwood its first all-weather evacuation route. It could save lives in the future.
For More Information
For more information about Northpark Drive expansion and a history of the project, see these posts on ReduceFlooding.
8/17/24 – The clearing of trees blocking streams and channels in the Lake Houston Area has begun. The clearing began after a coordinated inventorying and reporting effort.
According to Chris Bloch, a member of the Bear Branch Trail Association Board, FEMA contractors working for Harris County Flood Control District (HCFCD), were seen this morning clearing trees blocking Bens Branch. The stream cuts diagonally through the middle of Kingwood.
Fallen trees blocking Bens Branch
If left in the stream, the trees can catch other debris floating downstream and create log dams that back floodwater up into streets and homes. So, contractors are cutting the fallen trees into sections and removing them.
This morning, I found them hauling the logs and underbrush out of the woods with a Bobcat fitted with grappling jaws. They stacked the debris near Woodland Hills Drive to be hauled away.
However, in coming days, contractors will be using much larger equipment and actually going down into the channel to remove logs and haul them off.
According to Bloch, just cutting the logs into small sections and letting them float away in the next flood is not the answer. They could still harm unsuspecting boaters and waterskiers in Lake Houston.
Beware of Heavy Equipment with Limited Visibility
It’s unclear at this time how long the clearing operation will take. But Bloch estimates that it could easily take a week or more to get all the way down Bens Branch.
Other contractors may be working on other channels simultaneously. However, I have been unable to verify that at this time.
Photograph taken 8/17/24 near St. Martha School at Bens Branch and Woodland Hills Drive.
Residents should exercise caution when using greenbelt trails during the removal operation. Operators maneuvering in tight spaces have limited visibility when transporting logs and brush. They will use greenbelt trails in some places and CenterPoint easements in others.
Residents who use the trails to get to school or for recreation should consider wearing brightly colored shirts or reflective vests to increase their visibility.
Members of the Bear Branch Trail Association Board met with the contractor last night to show them where obstructions are in Bens Branch and other channels.
Note the size of some of those logs. The pile is 6-8 feet tall.
Inventorying the blockages was difficult. Now comes the really hard part.
Posted by Bob Rehak on 8/17/24
2545 Days since Hurricane Harvey and 40 since Beryl
https://i0.wp.com/reduceflooding.com/wp-content/uploads/2024/08/20240817-DSC_0213.jpg?fit=1100%2C733&ssl=17331100adminadmin2024-08-17 15:50:282024-08-17 16:12:00HCFCD Contractors Begin Clearing Trees Blocking Streams, Channels
What Can Be Done to Reduce Flood Risk?
Flood-control experts have many tools in their tool chests to reduce flood risk. They include:
I’m sure more techniques exist. But those represent the big categories.
Complex Decisions Involving Many Factors
No one tool works for all situations. And many of the tools that reduce flood risk fly in the face of other human values. They may conflict with other values beyond safety, that we hold dear. Consider, for instance, property rights, individual freedom, job formation, expanding the tax base, a desire to live near water, and risk-taking.
So how do professionals decide which tools to apply where and when?
Again, it depends on a number of factors. To name a few:
Homeowner Inquiry Prompted Exploration
A homeowner reacted to one of my posts today. She lives in a low-lying area near FM1485 and the San Jacinto East Fork. It flooded badly on May2, 2024. She was certain that dredging and tree removal from the East Fork would help. But after investigating the area online, then from the ground and air, I wasn’t sure.
The normal river elevation in that area is 47.25 feet.
But on May 2, the river rose to 77.4 feet – 17 feet above the top of the river banks and 30 feet above normal!
Jeff Lindner, Harris County Meteorologist, had this to say about the May flood. “Since 1994, this was the second highest crest of the river at FM 1485. It exceeded Tropical Storm Imelda by 4.0 ft and the October 1994 flood by 1.0 ft.”
Lindner continued, “The flood of record remains Harvey which was 4.0 ft higher than the May 2024 event. The river exceeded the .2% (500-yr) exceedance probability elevation at the FM 1485 bridge by 1.5 ft. The table below shows the top five highest peaks on the East Fork of the San Jacinto River since 1994 at that location.”
Date Peak Elevation
HCFCD calculates the elevation of a 100-year flood is 70.6 feet.
So…
See the FEMA floodplain map below for the area in question.
It shows you how difficult flood prediction can be. It also shows you why even nature lovers should give water in Texas a wide berth unless they are prepared to lose everything. The May flood wasn’t even related to a tropical event!
Unfortunately, most of the homes in this neighborhood didn’t look like people could afford to lose everything. And I saw several that had been totally obliterated along with two roads that washed out.
Professionals Say Buyouts Best Option In This Case, But…
In an area like this, flood-mitigation professionals have few good options. Given the depth of flooding, three professionals told me that intervention would have to be on a massive and costly scale to make a difference. As a result, each suggested buyouts as the best, most cost-effective alternative in this area.
Shortly after the May event, I interviewed a young couple named Daniel and Kathleen Moore. They lived on some of the highest land in the subdivision, but had flooded three times in the seven years that they owned their home (Harvey, Imelda, and May 2024).
They were hoping for a buyout. I called again today to see if they succeeded, but they were selling their property and moving out of state with their new baby. Why?
While Daniel was restoring the home, someone burned it to the ground on July 28th. Nothing stands there now but a charred chimney.
This was a heartbreaking story that deeply affected me personally. I once lived in a home near a creek that flooded frequently when I had two young babies.
While buyouts may sometimes be the most cost-effective option, they are not easy, according to a County Emergency Management Director that I interviewed. Counties must apply for FEMA buyout money and then it can take years to evaluate and rank all the applications and distribute the money.
Forest Cove buyouts took five years after Harvey to complete.
Ironically, the fact that the Moore’s were in a 500-year floodplain may have hurt their buyout chances. FEMA likes money to go to homes that are insured but which flood frequently.
So What About Dredging and Tree Removal?
The Moore’s lived in Montgomery County. But the other family that contacted me lived on the Harris side of the county line in the same neighborhood.
Experts I talked to suggested dredging wouldn’t make an appreciable difference given the narrow width of the river channel and the height of flooding. Plus, it could undermine more trees along the heavily wooded banks.
Removing trees that have already fallen, they say, is a good idea. They could float downstream, form log dams that flood other homes, and/or harm boaters in Lake Houston. But who is responsible for removing them?
I asked Matt Barrett, head of SJRA’s Flood Management Division. Said Barrett, “SJRA’s jurisdiction does not include Harris County, so projects constructed in Harris County would have to be led by HCFCD.”
Distant Chances for Other Flood Mitigation
That said, Barrett also volunteered that SJRA has partnerships with both HCFCD and the City of Houston. The entities work together on multiple projects from the San Jacinto River Basin Master Drainage Plan. But finding funding remains a challenge. And large scale projects are not quick to implement.
That brings us full circle to the original question in the headline. What was or is the best thing(s) homeowners can do to reduce their flooding chances? In my opinion:
I’m not a professional engineer and I do not render professional engineering opinions. But I have interviewed a lot of flood victims who wish they could turn back the hands of time and build on higher ground.
If you have the slightest qualms about flooding when purchasing property, make sure you consult a professional engineer to evaluate your risk and mitigation options.
Posted by Bob Rehak on 8/20/24
2548 Days since Hurricane Harvey
The thoughts expressed in this post represent opinions on matters of public concern and safety. They are protected by the First Amendment of the US Constitution and the Anti-SLAPP Statute of the Great State of Texas.
Northpark Construction Sequence Changing
8/18/24 – The sequence and timing of upcoming construction steps for the Northpark Drive Expansion Project is changing. Project Manager Ralph De Leon wants the public to know what will change, why and when between now and the end of the year.
All parties involved in the construction met last week and agreed to the plan outlined below. However, De Leon warned that it could still change. The new plan will start within the next two to three weeks. The steps outlined below should be substantially completed by December.
Unfortunately, they could involve fewer lanes for a period a time and will cause a total closure of Northpark for three days. The original plan kept two lanes of traffic open in both directions at all times. But that is no longer possible.
Reason for Changes
Due to highly publicized delays caused by utility conflicts, project planners started building pieces of the project out of sequence to keep crews busy.
“We are now out of sequence globally,” said De Leon. “That will never change. So throw out everything you knew in the past. We will publish a new schedule this week or next.”
A complex series of signal changes for traffic, railroad and pedestrian crossings also contributes to the schedule changes. And they will need to be built twice: once for temporary traffic and again for permanent traffic.
Electronics are driving the new Northpark construction sequence more than concrete at this point, according to De Leon. “Boring and installing communication cables to temporary, then permanent signals is the difficult part,” he said.
The schedule changes will not affect what is being built, just when. Nothing has changed regarding the goals. Additional lanes and the planned bridge over 494 and the railroad will still be built.
New Sequence Affects Planned West- and Eastbound Feeder Roads
This new Northpark construction sequence affects how and when the west- and eastbound feeder roads will be constructed. The old plan called for both to be constructed at the same time.
Then traffic was to have been rerouted to the new feeders while contractors demolished the middle. However, that is no longer viable as you can see from photos below.
Instead, Harper Brothers will construct eastbound feeder roads on the south side as they place culverts west to east along the north side. They will start at the Shell station on the northwest corner of Loop 494 and Northpark and work their way down to the area by the Quick Quack Car Wash.
De Leon’s goal is to keep the existing at-grade railroad crossing intact and use that for west bound traffic. The new feeder road on the south side will handle eastbound traffic.
However, that could still change. “We could have to switch everybody (both directions) to the new feeder road. That would mean a single lane for both east- and westbound traffic until the second westbound feeder road is constructed on the north side.”
Pictures Taken Friday 8/17/24
UPRR will construct a crane on top of the rail tracks needed to install 200 feet of track panel. For that to happen they must rip out the existing rail tracks and reroute all traffic to rail lines that parallel the Hardy Tollroad.
The panel is in a single section that will stretch across ten lanes. UPRR needs that for track stability. However, its length will mean totally closing Northpark for three days.
While painful now, when finished, this project will give Kingwood its first all-weather evacuation route. It could save lives in the future.
For More Information
For more information about Northpark Drive expansion and a history of the project, see these posts on ReduceFlooding.
Posted by Bob Rehak on 8/18/24
2546 Days since Hurricane Harvey
HCFCD Contractors Begin Clearing Trees Blocking Streams, Channels
8/17/24 – The clearing of trees blocking streams and channels in the Lake Houston Area has begun. The clearing began after a coordinated inventorying and reporting effort.
According to Chris Bloch, a member of the Bear Branch Trail Association Board, FEMA contractors working for Harris County Flood Control District (HCFCD), were seen this morning clearing trees blocking Bens Branch. The stream cuts diagonally through the middle of Kingwood.
If left in the stream, the trees can catch other debris floating downstream and create log dams that back floodwater up into streets and homes. So, contractors are cutting the fallen trees into sections and removing them.
This morning, I found them hauling the logs and underbrush out of the woods with a Bobcat fitted with grappling jaws. They stacked the debris near Woodland Hills Drive to be hauled away.
However, in coming days, contractors will be using much larger equipment and actually going down into the channel to remove logs and haul them off.
According to Bloch, just cutting the logs into small sections and letting them float away in the next flood is not the answer. They could still harm unsuspecting boaters and waterskiers in Lake Houston.
Beware of Heavy Equipment with Limited Visibility
It’s unclear at this time how long the clearing operation will take. But Bloch estimates that it could easily take a week or more to get all the way down Bens Branch.
Other contractors may be working on other channels simultaneously. However, I have been unable to verify that at this time.
Residents should exercise caution when using greenbelt trails during the removal operation. Operators maneuvering in tight spaces have limited visibility when transporting logs and brush. They will use greenbelt trails in some places and CenterPoint easements in others.
Members of the Bear Branch Trail Association Board met with the contractor last night to show them where obstructions are in Bens Branch and other channels.
Inventorying the blockages was difficult. Now comes the really hard part.
Posted by Bob Rehak on 8/17/24
2545 Days since Hurricane Harvey and 40 since Beryl