Daniel and Kathleen Moore live with their 8-month old baby near the East Fork San Jacinto in Montgomery County. The young couple desperately wants a buyout after their house on Idle Glen in New Caney flooded three times in seven years. But no buyout is in sight.
When they bought the home, they were told it was in the 500-year floodplain. In fact, Montgomery County flood maps still show their home is in the 500-year (.2% annual chance) floodplain.
However, that determination is based on floodplain data from the 1980’s – before the Moores were even born. And since then, the area upstream from them has boomed with new development.
New Upstream Development Invalidates Old Data
For instance, Colony Ridge, just 2.5 miles to the northeast on the other side of the river, has grown 50% larger than Manhattan since 2010 – with virtually no flood mitigation measures on the East Fork side of the area.
In one seven year stretch (2017 to 2024), the Moores flooded three times. During Harvey, they flooded to nine feet. In Imelda, they got one foot. And in the no-name storm of May 2024, five feet of floodwater destroyed everything in the bottom floor of their home.
Said Daniel, “I figured Harvey was extreme. I didn’t worry too much about that. But the next two storms were different. We just can’t afford to rebuild every two or three years.” Daniel works as a mechanic. “The pay isn’t that great,” he says. “We need to move.”
Rebuilding Without Flood Insurance
After the first two floods, they rebuilt the home with money from their own pockets – without benefit of insurance. But with a new baby, they can no longer afford that.
The Moores’ story underscores how inexperience can hamstring young couples on technical issues, such as floodplain delineation and flood insurance.
The moral of this story: before you invest in a new home, consult with a professional hydrologist about the risk. Talk to neighbors about past flooding. Look for tell-tale signs like mold on neighbors’ homes, rotting wood, and elevated structures.
And buy flood insurance. It’s available through FEMA and the National Flood Insurance Program. Not all agents feel the commission justifies the trouble of handling it, especially if the home has a history of flooding, so you may get mixed signals from them. Shop around.
Moore Photos During and After May 2024 Flood
Daniel tried to return home after spending the first night with his family in a motel. He couldn’t get onto the feeder road from SH99. This picture shows FM1485 totally flooded.
FM1485 on second day of flood.Raging waters reached the top of the street sign and nearly touched the power wires.Floodwater jumbled the living room furniture.Another room totaled.
Cleanup after the Flood
I took the following shots on 5/18/24. As Daniel worked to gut his uninhabitable home once again, his wife tended the baby at her mother’s home.
Living room of Daniel and Kathleen Moore destroyed by flooding in May 2024Daniel points to height of flood waters. For reference, he is 6’5″ tall.Possessions carted to curb and picked over by scavengers.
Scavengers feel, “What difference does it make? They’re throwing this out anyway.” But it makes flood victims feel victimized all over again. Daniel says he’s found people picking through his belongings every day since the flood.
Floodwater reached the top of Kathleen’s Tahoe. It floated during the flood and turned 90 degrees. No one knows where the phone pole came from.Daniel, tired, bewildered, and still a bit dazed.
But the Moores’ trials and tribulations are not over.
Buyout Chances
The Moores have had a hard time connecting with anyone in Montgomery County who will offer them a buyout.
Ironically, the fact that they are in a 500-year floodplain that hasn’t been updated in 40 years could hurt their buyout chances. FEMA scoring generally favors those with higher risk.
FEMA also favors homeowners with flood insurance. That’s because buying out the homeowners would likely save FEMA money on insurance reimbursements after multiple floods.
But that’s not all.
River Rising Again
Before leaving the Moores’ home, I put my drone up and saw this.
East Fork rising again. Out of banks and flooding FM1485 (right) near 1 PM on May 18, 2024. Looking E.Note river on middle right already had risen over one road in the neighborhood.Daniel says FM1485 is totally under water now.
As of 6 PM, the National Weather service shows the river is still rising. They predict it will crest tonight just under major flood stage near 69 feet.
NWS prediction as of 5:52 PM on 5/28/24 for gage within blocks of Moore home.
That should bring the water close to the Moores’ front door again.
As I drove around his neighborhood, I marveled at the number of abandoned and flooded homes. One can only wonder whether this neighborhood will survive.
Please pray for the safety of all who live there.
Posted by Bob Rehak on 5/18/24
2454 Days since Hurricane Harvey and 2 Weeks since the No-Name Flood of 2024
https://i0.wp.com/reduceflooding.com/wp-content/uploads/2024/05/20240518-RJR_3527.jpg?fit=1100%2C733&ssl=17331100adminadmin2024-05-18 19:28:082024-05-18 20:51:01Flooded 3 Times in 7 Years in 500-Year Floodplain, But No Buyout
5/17/2024 – The Hallett sand mine on the San Jacinto West Fork appears to have dug a trench across the maintenance road of its settling pond to lower the pond’s level. Murky wastewater is draining into the West Fork while the SJRA is currently releasing 10,875 cubic feet per second (CFS) from Lake Conroe in the wake of yesterday’s heavy rains.
Sediment released from the mine is being picked up by the Lake Conroe water and carried downstream. Note below how sediment has discolored the West Fork.
Picture taken 5/17/24, at the confluence of the West Fork, Spring Creek and Cypress Creek. Cypress joins Spring slightly upstream on the left.The branch on the right is immediately downstream from 20 square miles of sand mines between US59 and I-45.
Where The Sludge is Coming From
In the last few weeks I’ve posted extensively about how the West Fork has breached the dikes of a pit formerly owned by Hallett. As of this afternoon, the river continues to run through that pit. No attempt has been made by the new owner to re-establish the dikes. And that certainly contributes to downstream sedimentation.
But this afternoon, I discovered an additional source of sedimentation thanks to a tip from a nearby fishermen who stumbled across a breach in Hallett’s settling pond. See video below.
Video supplied by fishermen.
It’s hard to get a sense of the location from the close up, so here’s the location of the breach in a satellite image from Google Earth.
General location of breach and path to river in red oval.
And here’s a more detailed look at the path the water took on its way to the river.
Looking N. Silty water leaves Hallett’s settling pond through a trench dug in the tree-line. From there it flows through an abandoned sand mine and then through another breach into the West Fork.Reverse angle shows silty water flowing out of Hallett settling pondinto abandoned neighboring mine.Detail cropped from shot above shows how heavy equipment worked the area.Looking S downstream. Abandoned mine on left, West Fork in middle and breach through another pit on right.
Timing of Release Should Raise Eyebrows
The timing of this release is suspect: Friday afternoon just before regulators headed home for the weekend.
I’ve documented a history of breaches from this pond dating back to 2019 and the fishermen say they’ve seen breaches before that.
Hallett flushed water from this and other ponds after the January floods in 2024 but via different routes.
Lest you think I’m picking on Hallett, it isn’t the only sand mine emptying its settling pond into the West Fork.
I also documented an instance when the West Fork ran white from a release at the LMI Moorhead Mine upstream from Hallett. TCEQ estimated they released 56 million gallons of sludge into the river. That pond dropped 3-4 feet according to the TCEQ.
Regular Occurrence
The montage below shows the confluence of the West Fork and Spring/Cypress Creeks from different angles on different days. In all cases, the polluted branch was the West Fork. I took these shots while photographing West Fork sand mines from a rented helicopter.
A former West Fork mine operator and a former water quality manager for the City of Houston tell me that releasing sediment-laden water under the cover of floods is standard operating procedure for many mines on the West Fork.
Who Will Bear the Cost of Clean Up, Dredging?
Think this doesn’t affect you? It affects your water quality and the cost of cleaning it up. Lake Houston supplies drinking water for more than two million people.
And if you live between the mines and Lake Houston, it probably will affect you another way.
Most sediment moves during floods. During Harvey, the West Fork swept through 20 square miles of sand mines between I-45 and I-69. According to the Army Corps, deposited sediment blocked the West Fork by 90%. That reduced the conveyance of the river and caused water to rise into homes and businesses. Almost 20,000 flooded in the Humble/Kingwood area.
Since then, taxpayers have spent more than $200 million on dredging. And the City is getting ready to launch another $34 million dredging program.
However, that program won’t address the mouth of the Kingwood Diversion Ditch at the River Grove Park boat launch.
KSA has obtained bids north of $800,000 to dredge the blocked area. Spending that kind of money will be necessary to keep the KSA boat launch open. It has become badly blocked by sediment during two floods since the start of the year.
Here’s what that area looked like yesterday afternoon when the SJRA release rate was closer to 1500 CFS.Water level in river was still up about a footabove normal.
Living with sediment is all part of life on the river. But dredging intervals at River Grove have gone from 8 years before Harvey to 4 to 2 years since Harvey.
If this continues, KSA may be forced debate whether it can afford to keep the boat docks open.
Harris County Precinct 3 Commissioner Tom Ramsey, PE is trying to work with upstream authorities to reduce sedimentation that can lead to flooding. But it’s an uphill slog. No pun intended.
Posted by Bob Rehak on 5/17/2024
2053 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.
4:30 PM May 16, 2024 – The National Weather Service has issued a trio of alerts that affect the Lake Houston Area. A tornado watch, flood warning, and flood watch are all simultaneously in effect.
Scene Capture from RadarScope Pro at 4:12PM 5/16/24
Tornado Watch
The three include a tornado watch until 10 PM tonight. The watch includes all counties in the Houston Region and then some.
AUSTIN BRAZORIA BRAZOS BURLESON CHAMBERS COLORADO FORT BEND GALVESTON GRIMES HARDIN HARRIS HOUSTON JASPER JEFFERSON LIBERTY MADISON MONTGOMERY NEWTON ORANGE POLK SAN JACINTO TRINITY TYLER WALKER WALLER WASHINGTON WHARTON
Update: At 5:50 PM, issued a tornado warning for NW Harris, Austin and Waller Counties. They spotted rotation on radar. The warning will expire at 6PM, but it speaks to the severity of these storms.
Flood Warning
The Weather Service has also issued a flood warning for the San Jacinto East Fork. Predicted crests are increasing from minor to moderate levels near FM1485. This could affect people in Harris, Montgomery and Liberty Counties. Some are still cleaning up from the flood two weeks ago.
Flood Watch in Wider Area
Finally, a flood watch has been issued due to excessive rainfall across the region. This one could trigger flooding on other creeks, streams and bayous. The watch area includes:
This watch is primarily due to excessive rainfall associated with the approaching storm. It could drop 2-4″ across a wide area, with isolated totals up to 6-8″.
Lake Houston is in the area of highest risk – Level 4 – for excessive rainfall.
National Weather Service (See below.)
Flash Flooding Possible
High intensity rains could produce flash flooding that makes driving dangerous.
The ground is already super saturated from previous rains. “There is just nowhere for the water to go,” said Harris County Meteorologist Jeff Lindner.
According to Lindner, “Widespread rainfall amounts of 2-4″ will be likely north of HWY 105. Isolated totals could reach upwards to 6-8 inches. Amounts will decrease toward the south with totals near the coast less than 1 inch. This will virtually be a carbon copy of the last several rainfall events in terms of location and amounts.”
Lake Report
Lake Conroe was releasing 1590 cubic feet per second until the noon hour today. Then, the SJRA stopped releasing water give the Coastal Water Authority a chance to reduce the level of Lake Houston. Lake Houston continues to release water.
Lake Conroe operators hoped they had enough capacity in the Lake to absorb the expected influx of water. But at 4:30PM, the resumed releasing 1587 CFS.
They also announced that they will “pass through storm water and runoff received in the Upper San Jacinto River Basin until Lake Conroe returns to conservation pool.” (201 feet)
Both lakes just returned close to their normal levels from the floods in early May. However, Lake Houston is still a few inches above normal.
Total inflows into Lake Houston are at 6,627 cfs and outflows are at 8,960 cfs. Lake Houston gates have and will remain open until the gate that is stuck partially open is repaired.
Impact on Sedimentation
Most sediment moves during floods. And the West Fork sure has been piling up sediment lately. KSA just completed a sonar survey in River Grove Park where the Kingwood Diversion Ditch enters the West Fork.
Before the last storm, sand had built up at the mouth so that only about two feet of clearance was available for boats. After the last storm, sand is poking up even closer to the surface…and the river is still about a half foot above normal.
Even with water up about a half foot, you can see sand bars lurking just below surface at the River Grove boat launch.
The City of Houston is getting ready to launch a new $34 million dredging program between Kings Point and FM1960.
DRC/Callan Marine mobilizing for new dredging program south of Forest Cove Pool.
Unfortunately, the new City program won’t include the mouth of the Diversion Ditch. KSA will have to hire its own dredger to keep the boat docks open.
KSA’s dredging interval has gone from 8 to 4 to 2 years. It sure seems as though it would be less expensive if we didn’t have West Fork floods flowing through sand pits.
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/2024/05/4PM-Front.jpg?fit=1100%2C632&ssl=16321100adminadmin2024-05-16 16:27:222024-05-17 22:48:00Tornado Watch, Flood Warning, Flood Watch In Effect
A report issued by Harris County’s Meteorologist Jeff Lindner puts the May 2024 flood into historical perspective.
Significant flooding occurred along the West and East Forks of the San Jacinto River as well as the lower San Jacinto River below Lake Houston.
While rainfall occurred over a 7-day period, the most intense rainfall in Harris County fell on Thursday, May 2nd. Lindner’s report starts by covering the rainfall totals and intensity during different lengths of time. Then, he discusses the resulting flood heights and impacts.
Locations of 7-day rainfall totals between April 28 and May 5. Upstream areas received twice as much as Lake Houston.
Total Rainfall in 7-Day Period
Total rainfall amounts for the seven-day period averaged 10.0-17.0 inches across the extreme northern and northeastern portions of Harris County. Southern and central Montgomery County were also affected as well as northern Liberty County.
A maximum 7-day rainfall of 16.8 inches was recorded on the East Fork of the San Jacinto River at FM 1485.
The table below indicates maximum rainfall for Harris County gages.
Maximum rainfalls for different periods from 5 minutes to 7 days.
Using Atlas-14 Rainfall Exceedance Probability Tables, Lindner says rainfall during the 7-day time period ranged from:
5- to 10-year events on the San Jacinto West and East Forks as well as below Lake Houston
2- to 5-year events on Cedar Bayou.
2- to 10-year events along Luce Bayou.
Maximum 2-Day and 3-Hour Rainfall Totals
The max rainfall for those same watersheds during the peak 48-hours ranged from 2- to 10-year events.
During the peak 3-hour time period, however, gages on Willow Creek, Spring Creek, Luce Bayou, Cedar Bayou, and the San Jacinto recorded 25- to 50-year rains. The short, high-intensity rains resulted in deep street and flash flooding.
North of Harris County, the rainfall got much more intense.
Locations of Heaviest Rainfall
The majority of the heavy to excessive rainfall occurred across areas north and northeast of Harris County. This was across the headwaters of the West and East Forks of the San Jacinto River, Luce Bayou, and Lake Creek.
Rainfall amounts over the 7-day period averaged 15.0-18.0 inches over southern Walker and northern Montgomery County which drain into Lake Conroe. They averaged 15.0-20.0 inches across eastern Walker County, northern Montgomery County, and San Jacinto County which drain into the East Fork of the San Jacinto River.
“No two storm events are exactly the same with respect to the location, duration, and maximum totals of rainfall.”
Jeff Lindner, Harris County Meteorologist
Comparisons with Other Storms
The May 2024 rainfall had some similarities to the October 1994 flood. Nearly 30 inches fell across Lake Creek and the northwest portions of the Spring Creek watersheds in 1994. In 2024, the highest totals occurred farther to the north – from north of Lake Conroe to northwest of Lake Livingston.
In those locations, the rainfall exceeded 1994. That resulted in near record inflows for both Lake Conroe and Lake Livingston.
Comparison of maximum rainfall totals in different time periods for different storms.Note especially the totals for 1-hour and less.
Flooding in Historical Perspective
Rainfall is only a starting point when investigating flooding. You must also look at rainfall distribution, intensity, longevity, previous heavy rainfall, ground saturation, already swollen watersheds, and convergence of peak flows.
Much of the upper portions of the San Jacinto basin stretch across parts of Montgomery, Walker, and San Jacinto Counties. In April, they experienced rainfall 150% to 500% above normal.
Rainfall on April 28th-29th primed already wet soils for maximum run-off. Then, those same areas received additional excessive rainfall on May 1st-2nd. The second episode generated widespread and significant flash flooding and run-off into the rivers and creeks that drain to Lake Houston.
Second Highest Peak on East Fork
The East Fork exceeded the expected elevation of a 500-year storm. At FM1485, only Harvey exceeded the May peak.
San Jacinto East Fork peaks at FM1485.
Five-hundred year flooding on a 20-year rain resulted when peaks from different rounds of rainfall piled on top of each other from different watersheds.
Fifth Highest Peak on West Fork
West Fork flooding was less extreme. This was the fifth highest flooding on the West Fork since 1994. The May flood qualified as a 10- to 50-year storm based on gage readings at US59.
Five highest peaks on San Jacinto West Fork since 1994.
Fourth Highest Peak at Lake Houston Dam
The height of water going over the spillway at the Lake Houston Dam was the 4th highest peak since 1979.
Downstream at Highway 90, residents saw the 9th highest peak since 1979. Downstream areas saw between a 10-year and 50-year flood.
Third Highest Volume of Stormwater Flowing Into Lake Houston
The table below summarizes volumes of water in cubic feet per second flowing into Lake Houston from the various watersheds during different storms. This May’s event was the 3rd highest total since 1994. Only Harvey and October 1994 surpassed it.
Water flowing into Lake Houston in different storms since 1994. This May was 3rd largest volume.
House Flooding Estimates
Flood depths ranged from 6 inches to several feet in some of the lowest lying homes. The damage numbers below apply only to Harris County. The numbers were supplied by City of Houston and Harris County Engineering.
20 homes flooded with an additional 16 having water in sheds, garages, or other non-living areas on the West Fork.
32 homes flooded with an additional 8 having water water in non-living areas on the East Fork.
Upstream, the flood damage in Montgomery and Liberty Counties was much greater. However, I do not have final totals for those areas yet.
Maps, Tables Galore
Lindner’s report also includes 15 pages of rainfall intensity maps and tables for different watersheds and gages. It’s a treasure trove of information including high water marks. Click here for the full report. For future reference, that’s under the link to the Major Storms tab on the Reports Page. You can compare full reports on other storms there.
After the floods of early May 2024 and as we got yet another flood warning (East Fork at FM1485), people are asking once again, “What can we do to reduce our flood risk?” Ironically, with a few exceptions, the answers are the same as those identified after Harvey. We just need to implement them.
Few of the action items identified years ago have been implemented. Meanwhile, many underlying conditions that contribute to flood risk, i.e., insufficiently mitigated upstream development and sand mining, are accelerating. Sometimes it feels that as fast as we fix things up, others muck them up.
Could have Been Much, Much Worse
The Lake Houston Area narrowly escaped a disaster during the early May floods. A small number of homes flooded. However, a far larger number were almost seriously damaged. Had storms dumped a little more water in the wrong places, that flood could have easily destroyed thousands of homes. Water was lapping at their foundations.
Ironically, the amount of water that caused the flooding this May was about a third of what we received during Harvey.
That should underscore how vulnerable people in the Lake Houston Area remain to flooding. So, let’s look back at what happened to recommendations that came out of Hurricane Harvey studies.
Recommendations from 2020 San Jacinto River Watershed Master Drainage Plan
After Harvey, Harris County Flood Control, Montgomery County, the San Jacinto River Authority and the City of Houston joined forces to identify ways to reduce flood risk in the San Jacinto River Basin.
In December 2020, they published a 3,600 page study called the San Jacinto Regional Watershed Master Drainage Plan.
Pages 36-38 of the executive summary contain recommendations. Page 38 identifies and quantifies the value of 16 recommended flood-mitigation projects.
Short-Term Strategies (Page 36)
Vision Group – to promote collaboration and momentum
Policy – standardizing minimum requirements for future development
Floodplain Preservation – to prevent increases in future flood risk
Flood Monitoring and Warning Enhancements – adding gages along major streams
Flood Response – enhancing communication, identifying and prioritizing flood prone areas, and developing public education strategies
Buyouts – to remove homes and businesses that flood frequently from the floodplain
Floodplain Re-Mapping – to inform people of changes to their risk. Water surface elevations in a 100-year flood have increased between .5 and 4.5 feet with the adoption of Atlas 14.
Watershed Protection Studies – for each sub watershed to identify where we need local drainage improvements.
Long-Term Strategies (Page 37)
Adoption of “No adverse impact” Policy – to ensure upstream mitigation efforts don’t increase downstream flooding
Right of Way Acquisition – purchasing land for future flood mitigation projects
Utilities and Roadways – protecting evacuation routes and critical infrastructure during planning
Project Phasing to Overcome Funding Constraints – due to the high cost of mitigation projects.
16 Specific Channel and Stormwater-Detention Projects (Page 38)
See project rankings in table below along with projected costs.
Top 16 Projects Identified in SJR Master Watershed Plan
Subsequent portions of the report describe each recommendation in each category in more detail. You can find all sections on the HCFCD website. They total hundreds of megabytes.
Not Much Has Happened in Last Four Years
Sadly, while elected officials have been busy chasing funding, not much has been accomplished on the ground in any of these three categories that would actually reduce flood risk. Said another way, we’ve seen little construction. We’ve seen most progress in the first category.
Short-Term Solutions:
Vision Group: The San Jacinto Regional Flood Planning Group was recommended to pull together recommendations for the State’s first flood plan. A draft was released last week.
Policy: Montgomery County is revising its drainage criteria manual. But county commissioners have not yet adopted it. Neither MoCo, nor Liberty County have adopted the minimum drainage standards for areas draining into Harris County.
Floodplain Preservation is spotty. Non-profits, such as the Bayou Land Conservancy have stepped up. And some governmental agencies have discouraged floodplain development. But loopholes exist in regulations and enforcement is lacking in many places even if regulations exist.
Flood Monitoring and Warning Enhancements – SJRA installed several gages upstream from Lake Conroe, but more are still needed. In the last flood, they still couldn’t tell exactly how much water was coming in so that they could match releases to stabilize the lake level.
Flood Response: Harris County Flood Control stepped up its warnings and provided updated river forecasts two to three times a day. The SJRA did too. The Mayor had multiple press conferences in the Kingwood area before and during the flood. He worked with first responders to make sure people were kept out of harms way. That was a far cry from Harvey where a quarter of all the deaths in the county happened in Kingwood. And elderly people found themselves trapped by rising floodwaters in the middle of the night.
Buyouts – HCFCD bought out the townhomes along Marina Drive in Forest Cove that flooded repeatedly. And Montgomery County has also bought up many properties that flooded repetitively. But many more remain.
Floodplain Re-Mapping – FEMA has yet to approve Harris County’s updated flood maps. They’re still approximately three years from completion.
Watershed Protection Studies – Some have been done. Other’s haven’t even started. It’s been spotty. Little has been done with the studies already completed. And no grants will be approved without studiers.
Long-Term Solutions:
“No adverse impact” is violated more than the Ten Commandments.
Right of Way Acquisition – has moved forward on several properties in the Cypress Creek watershed and Harris County bought the 270-acre Woodridge Village Property in Montgomery County from Perry Homes.
Roadways – Lake Houston Redevelopment Authority/TIRZ 10 is expanding Northpark Drive and building an all-weather evacuation route out of Kingwood. It includes a bridge over the UP Railroad Tracks. FM2100 and FM1960 are expanding in Harris County. But the Huffman-Cleveland Road is still cut off in Liberty County. The Grand Parkway has been completed. But FM1485 right next to it has been cut off by floodwaters twice already this year.
Project Phasing – is a standard practice in the industry. But projects associated with the flood bond are moving so slowly that inflation has cost us about 20% of the bond’s purchasing power. Where will the money come from to complete all the projects?
Specific Projects
Not one of these projects listed in the table above has started construction. None is even close. No land has been acquired for any. And yet, unlike studies, these things actually protect property when floodwaters rise.
Engineers looked into Project #2 (Walnut Creek Detention), but by the time they investigated, someone had already purchased the land and announced plans to build a solar farm on it.
Where to Go From Here
Net: We’ve picked some of the low-hanging fruit. But we have a long way to go. Especially with construction projects that actually protect property.
As I interviewed people for this post, it became clear that different entities with different interests has hampered many mitigation efforts. We walk between competing, balkanized fiefdoms.
No one anywhere speaks for all the people of this watershed.
Just as bad, the business processes surrounding flood mitigation sometimes become bewilderingly complex. Many smaller counties, cities and MUDs don’t have the expertise to even apply for grants.
Even worse, some groups undermine improvements. For instance, we’ve dredged the mouth of the Kingwood Diversion Ditch at River Grove Park twice since Hurricane Harvey. And now it needs it again – as the West Fork flows through a sand pit. Even before floodwaters have receded, you can already see sediment poking up through the water. For decades the dredging interval was about once every eight years.
The people of a river basin are inextricably bound together by water. Yet our personal interests (What’s in it for me?) and political boundaries still divide us.
We need to recognize that fact and develop better ways to design solutions. More on that in a future post. I’ll also discuss some things that the San Jacinto River Basin Plan did not address.
Posted by Bob Rehak on 5/14/24
2450 Days since Hurricane Harvey
https://i0.wp.com/reduceflooding.com/wp-content/uploads/2024/05/20240514-LH-FloodMitProjects.jpg?fit=1100%2C793&ssl=17931100adminadmin2024-05-14 21:58:582024-05-15 14:43:03Most Projects To Address Lake Houston Flooding Still Not Started
Last week, the West Fork San Jacinto rerouted itself through a mile-long sand pit at the five-square mile Hallett Mine in Porter. Some people reported problems understanding how all the images in that post related to each other and where the mine was. To help eliminate confusion, I returned to the site this morning show continuous video from one breach to the other. I’ve also included a wider map below.
Location of Mine and Path of Video
The map below shows the relationship of the pit “captured” by the river to the rest of the mine, Porter and Kingwood.
Arrow indicates location and direction of drone video.
Video and Still Shots of Captured Pit
Clouds were low and I was flying near the base of them. So, the video looks a bit hazy.
One-minute video shot morning of 5/3/24 while flying from south to north.First breach is exit from pit, second is entrance.Water flows toward the camera through the pit to the left of the channel.
Note several things as you watch the video.
Size of the entry and exit breaches. They’re impossible to measure precisely, but likely greater than 100 feet wide.
Depth of the pond that used to be filled with wastewater before the dikes broke. See exposed sides where vegetation did not grow.
Sand being washed downstream before the water receded.
Dune blocking the West Fork in the upper right near the end of the video.
Here are some still shots with more contrast that show those highlights and other aspects. I’ll arrange these in the reverse order, i.e., flying downriver in the opposite direction starting from the entrance breach..
Giant dune has totally blocked off West Fork and diverted it into pit (upper left).Local residents say dune is 5-8 ft. high. People on either side of it cannot see each other.
Water now takes the path of least resistance, flowing through the giant pond.
Note freshly deposited sand in pit. The island (right center) is reportedly a burial ground for Native Americans.Note color difference in water and how pond water now flows downstream. Also note height of pond walls.
Have a cool, refreshing glass of Hallett.
This flows straight into Lake Houston.
Downstream Photos Taken on 5/13/23 at US59 Bridge
Looking S across West Fork toward Humble. Note ripples in fresh layers of sand under US59 Bridge.
The City of Houston is launching a new $34 million dredging program to remove another 800,000 cubic yards of sediment accumulating in the West Fork downstream from the bridge.
Hallett contends that sand cannot escape its pits and that this sand comes from river bank erosion on other tributaries such as Spring and Cypress Creeks.
Robin Sedewitz, Kingwood resident contributed the three photos and video below.
Note height of debris in bridge supports.
Trees swept downstream in the May flood are forming a dam on the south side of the old bridge.Trees caught under the southbound lanes of US59.
30-second video by Robin Sedewitz panning from upstream to down showing accumulations of debris in bridge supports.
During Harvey, debris such as this got caught in supports for the old railroad bridge and dammed the river, backing water up into Humble and Kingwood businesses. The railroad ultimately built a new bridge that would let trees pass through. No trees got hung up on the new bridge supports during this flood.
Where to Report Problems
Harris County Flood Control now surveys the river after floods and removes debris. They just haven’t gotten to this debris yet.
If you see problems that need HCFCD’s attention, you can report them here.
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/2024/05/20240513-DJI_20240513075211_0600_D.jpg?fit=1100%2C619&ssl=16191100adminadmin2024-05-13 16:31:332024-05-15 12:31:08Video of Mile-Long Sand Pit Leaking Into West Fork
Does a wetter-than-normal spring say anything about Houston’s chances for a busier-than-normal hurricane season? According to Jeff Linder, Harris County’s meteorologist, the two correlate poorly. In the process of exploring that, I discovered some surprising facts about the intensity and seasonality of rainfall in the region.
So Far, Not So Much Wetter than Normal
“Harris County is running slightly above normal for 2024,” says Lindner. “But much of this can be traced back to the rains in late January.”
“I would likely attribute the winter and early Spring rains more to the El Niño pattern in the eastern and central Pacific,” he added. “They tend to bring above-normal rainfall to the southern plains in the fall, winter, and spring months.”
“As for the upcoming hurricane season, there is little correlation between slightly above average rainfall and any sort of potential activity on the Texas coast. With that said, conditions look highly favorable for an active hurricane season in 2024 including very warm sea surface temperatures throughout the Atlantic basin, the collapse of El Nino and development of La Niña.”
Lindner concluded, “That tends to create increasingly favorable conditions for tropical development, especially in the Caribbean Sea, and a wetter than normal pattern from the coast of Africa into the Caribbean.”
The graphs below explain Lindner’s characterization of the temperature and rainfall as “slightly” above normal as we head into hurricane season.
I pulled them from the climate page for Houston on Weather.gov. The National Weather Service (NWS) shows 35 different reporting stations in the Houston region and gives you nine ways to visualize daily, monthly and yearly data.
As I browsed the site, I discovered two interesting things. When you look at monthly averages:
Rainfall totals differ greatly depending on your part of Houston.
Seasonality of rainfall also differs depending on your area.
Let’s look at the two variables using data and graphs from the climate page above.
Rainfall YTD vs. Highs, Lows, Averages
Bush Intercontinental Airport received about 21 inches of rain (YTD through May 12). In late January and February, Bush was having the rainiest year on record. But since then, despite very heavy rains to the north, we’ve only beaten the average YTD figures by a slight amount, as Lindner observed.
Meanwhile, Galveston started out with record rainfall. Only in the last two or three weeks did it fall behind the record year (1949). Galveston is still about 50% above its average total YTD.
In Conroe, rainfall totals have flirted all year with the record high year of 1935. They only dipped below average for a week or so in January.
Rainiest Months Vary with Distance from Coast
At Bush Intercontinental Airport, June (#1) and October (#2) are the rainiest months with May ranking #3.
But at Galveston’s Scholes Field, May is the ninth rainiest month and September the wettest. September is the peak of hurricane season.
In Conroe, May is the wettest month.
Spring rains play a larger role in the yearly total the farther north you go. But in Galveston, the totals jump up during hurricane season.
Not too much of a surprise there. Many fronts lose their punch before reaching the coast in the winter and spring months. Likewise, many tropical disturbances lose their punch 90 miles inland during the summer and fall – hurricane season.
What Data Illustrates
This data illustrates that it’s hard to generalize about the weather. You can’t take one storm (or even a series of storms) in one location and posit it as proof of a larger trend. Too many factors govern the weather to do that.
Moreover, my rain gage is reading 142% of the YTD figures from the nearest official gage at IAH just seven miles away.
That’s not uncommon. Sometimes a rain bomb lands on your home. Thunderstorms train over you for hours. Or a front stalls when it reaches your address. Those things can skew your perception of the weather.
That said, all the experts are still warning of a much higher-than-normal hurricane season this year. But for reasons unrelated to local flooding.
Happy Mother’s Day
Let me close this Mother’s Day with some beauty from Mother Nature. The son of a friend captured this image while flying around the storm that slammed north Houston on May 9th. He was at 30,000 feet and the clouds topped out at 70,000 feet as the sun was setting.
Photo courtesy of reader.Used with permission.
The power of the photo above should remind you. If you somehow missed it, we just finished Hurricane Preparedness Week. Have you made your preparations for hurricane season yet?
Posted by Bob Rehak on 5/12/24
2448 Days since Hurricane Harvey
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The San Jacinto West Fork has become totally blocked by sediment at the Hallett Mine in Porter and rerouted itself through the giant sand mine.
The old river channel has been sealed off by sediment. And the river now enters and exits one of the mine’s largest pits through large breaches in what used to be dikes. See below.
White oval shows location of blockage. Blue line shows old route of river. Red lines show detours through sand pit.
More than Normal Erosion
Rivers always move during floods through erosion. But this represents a far larger than normal amount of movement through a process called pit capture.
The river now runs through the Hallett pit instead of following its normal curving channel.
See photos below.
The loss of the dikes is likely the result of the SJRA releasing 71,000 cubic feet per second from Lake Conroe during the peak of the recent flood. That was the second largest release in the history of the SJRA.
Pictures taken just before the peak of the flood show the river already overtopping the pit’s dike. Dikes like walls that separate the river from the mine’s pits. They keep industrial wastewater out of your drinking water.
Weak Sand Mining Regulations Brought This On
Two other contributing factors are the depth of the pit compared to the river and the width of the dike.
The deeper the pit (compared to the river), the less stable the dike.
The narrower the dike, the weaker it is.
Until recently, Texas was one of the few states (if not the only one) that had no minimum setbacks of mines from rivers. Bill McCabe of the Lake Houston Area Flood Prevention Initiative was instrumental in lobbying for greater setbacks. The TCEQ adopted them in 2021, but this pit predated the new regulation. And the TCEQ did not enforce the regulation in this case.
In fact, this pit was open on its southern end since January. That breach was already expanding before the recent flood.
Pictures Taken Before and After Flood Show Pit Capture
Pictures taken during and after the flood show the impact.
Hallett Mine San Jacinto West Fork on May 3, near peak of recent flood.Same area photographed on May 11, 2024. Break in dike is circled in red.
Following the river around to the right, you can see how much sand the river laid down. This likely happened when the volume of water moving through the channel decreased as the velocity decreased, allowing suspended sediment to drop out of suspension.
The river which flows right to left, used to flow toward the bottom left. But now it flows into the pit (upper left).Closer shot showing the river being diverted into piton the left.
This video shows the height of the sand deposited in the river bed when the river started flowing to the pit instead of following its normal channel.
Video courtesy of a fisherman, Jody Binnion. Listen to his narration.This shot also gives you some idea of the height of the sand now blocking the river.Farther upriver but looking downriver, you can see how the river has been diverted. Note how narrow the dike is/was as it approaches the point of failure.Note the ripples on the water flowing into the pit.At the far southern end of the pond, the water exits back into the river through this breach that opened up in the January flood.Between the new entrance and exit from the pond, the Northpark ditch enters the river from Oakhurst and Northpark Woods.
Impacts Associated with Pit Capture
Without a river to remove sand from the confluence with the ditch, more and more sediment will likely build up here.
In regard to the last point, sand mining also frequently stirs up heavy metals such as lead and cadmium, which have been documented in academic literature. However, I have no evidence that such chemicals are coming from the Hallett Mine.
This river, which now flows through the Hallett pit, flows into Lake Houston. And Lake Houston is the source of drinking water for more than 2 million people.
Posted by Bob Rehak on May 11, 2024
2448 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.
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May 10, 2024 – The floodwaters have finally receded. The sun has come out. And the debris piles are ba-aack. People who flooded during the storms last week are taking advantage of the break in weather to muck out their homes, toss wallboard, and cart waterlogged furniture to the curb.
Nowhere in Kingwood was the flooding worse than on Dunnam Road where Taylor Gully, Caney Creek, White Oak Creek, Peach Creek and the East Fork San Jacinto all come together. At least six homes and a business flooded. And badly.
Today, I visited the area again to survey the damage and talk to the survivors. For the people who live there, it was like the Boulevard of Broken Dreams.
Photos Taken 5/10/24 on Dunnam Road
This isn’t the first time that Dunnam Road flooded. And it won’t be the last. Part of it is low and close to the river.
The flooding seemed especially poignant this time, however, because the heaviest rains fell more than 60 miles away and worked their way downstream over a period of several days.
The floodwater even peaked briefly and started to recede. This may have given many people false hope that they wouldn’t flood, despite the Harris County meteorologist’s warnings to evacuate.
West side of Dunnam is filled with debris piles.East side is also filled with debris piles. Note how force of water pushed fence in.Looking uphill toward higher ground.I think they’ll be needing more buckets and scrub brushes.This lady and her husband just moved here from El Paso by way of Tucson and LA. They wanted a place that wasn’t so dry and found Houston. She’s 5’6″ tall. So you can see how deeply their home flooded.Carrying all your belongings to the curb. Flooded closets and driers left people with only one option. The backyard fence.Previously flooded vacant home.This is a very patriotic community and many homes will need new flags.Oblivious to the tragedy and just happy to be in Grandma’s arms as she surveys neighbors’ damage.
Posted by Bob Rehak on 5/10/24
2446 Days since Hurricane Harvey
https://i0.wp.com/reduceflooding.com/wp-content/uploads/2024/05/20240510-RJR_3507.jpg?fit=1100%2C733&ssl=17331100adminadmin2024-05-10 17:54:392024-05-10 18:03:29Boulevard of Broken Dreams: Debris Piles are Ba-aack
Construction is always the riskiest period during a development project. Especially when you clearcut 533 acres and get 17 inches of rain … in a week. However, thanks to best practices and luck, most people surrounding the Sila development in Huffman narrowly escaped what could have become a major disaster.
As the people in Woodridge Village learned repeatedly on far less rain, best practices can make all the difference. They lived near a development where stormwater detention basins were not built before the rain; the people near Sila did.
The new 553-acre Sila Project in Huffman on the East Fork of the San Jacinto seems to have had considerably less impact on neighbors. This is a story of people caught between a rising river and sheet flow coming down a slope.
Sila’s Similarities, Differences with Woodridge
Several similarities with the Woodridge project exist. Sila is big. Built on an identical slope. And clearcut. But after 17 inches of rain last week, the outcome was dramatically different.
Instead of flooding hundreds of homes below the development as Woodridge did, most residents near Sila only got water in their yards. One fish pond was ruined. At least two vehicles flooded. And at least one garage flooded.
The big differences between Sila and Woodridge?
Sila had already built stormwater detention basins. When the rain hit, a series of berms and ditches helped funnel runoff to the basins and away from neighbors. Silt fences intercepted much of the runoff. And crews replaced the fences when silt started to spill over the top.
Before looking at pictures, first let’s look at some stats that put the rainfall in perspective.
5- To 25-Year Rainfall
After Sila weathered this year’s January rains, it got slammed again in the week between April 29 and May 5 with almost 17 inches of rainfall.
That included 7 inches in one day. And half of that fell in one hour.
Of the 17 inches, 7.12 inches fell on 5/2/24 alone, with 3.48 inches in one hour.
NOAA defines a 7-day/17.1 inch rain in this area as a 25-year rainfall. Ditto for a one-hour 3.88 inch rain. Seven inches in one day, however, is only a 5-year event.
However, the East Fork peaked at FM1485 at a level equal to a 500-year flood according to Harris County Flood Control’s Flood Warning System. That’s because even heavier rain fell upstream in less time. It then reached FM1485 when heavy rains were falling there.
East Fork peaked over 77 feet at FM1485 on May 5.According to HCFCD, 77 feet is more than a 500-year rain.
Also, according to HCFCD, to date, the area near FM1485 has received more than two thirds of a year’s average annual rainfall in about one third of the year – 34.72 inches!
Pictures Taken During Week of Heavy Rains
Northwood Country Estates resident Max Kidd provided many of the following photos taken at ground level during the flood.
They show mainly severe street flooding. Thankfully, Harris County Precinct 3 Commissioner Tom Ramsey’s crews had just finished cleaning roadside ditches. Otherwise these photos might have told a much worse story.
Water poured out of Sila across Northwood Country Road on 5/2, the day before the big rain.
On 5/3 and 5/4/24, Kidd took these photos.
Flooded home and vehicles.
Kidd believes the home above likely flooded from the East Fork. However, Sila runoff may have added to the flood depth.
Photos Taken After the Storm
Sila is so big that it’s hard to get it all in one shot. The aerial shots below were all taken on 5/6/24 after the rain ended.
Looking E across the southern portion of Sila. St. Tropez, a separate development is at very top of frameacross FM2100. But Sila drains to the East Fork, and St. Tropez drains to Luce Bayou.Luce later re-enters the East Fork near its mouth at the headwaters of Lake Houston.Sila had a swale behind the erosion to slow water running down a hill out of frame to the left. However, that swale filled in with sediment, according to Kidd. And water then flowed into a ditch behind the fence filling it with sediment, too. Still, some sediment flooded into the backyards of neighbors.A series of detention basins caught and channeled runoff through the development.Shortly after the rain ended, it appears that bulldozers graded perpendicular to slopes to help retain or slow down any additional rain that might fall.
In the photo below, also note the forested corridors that break up Sila runoff. While large portions have been clear cut, those that haven’t help retain sediment.
Detention basin was holding water and emptying it slowly, presumably at the pre-development runoff rate.Still, some sediment escaped the development. Note roadside ditch filling in at peak of triangle.
As I left after this photo session, I noticed workers replacing and reinforcing the silt fence above. But the photo below shows the volume of the sediment that escaped despite their efforts. A lot!
Drainage had filled in completely.Kidd’s fish pond is no longer habitableby fishdue to Sila runoff that polluted it.Lowest of the detention basins at southwestern edge of development was sending stormwater into a wetland mitigation bank before it reached the East Fork.Contractors had put silt fence at the outfall of the detention basin to help retain sediment.But then they pumped water toward the river, through a mass of muck, creating more erosion.(Can’t win ’em all.)Along the way to the river, some of the dirt will get a chance to settle out in the wetland mitigation bank.Regardless, the East Fork was running orange on 5/6/24.
No doubt, several sources contributed to the discoloration. They include Sila, other upstream developments, sand mines and natural, river-bank erosion.
Few developments that I have observed go to as much trouble to control runoff as Sila. And few bother to leave trees these days. I wish more did. We might have less sediment clogging our rivers and contributing to downstream flooding.
Posted by Bob Rehak on 5/9/24
2445 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.
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