February ’24 Northpark Expansion Update Including Lane Closures

In the past two weeks, construction activity for the Northpark expansion project has focused primarily on the ponds at US59 that will double as detention basins.

However, progress has also been made farther east. CenterPoint has been busy relocating gas lines. Contractors now have signed right-of-entry permits to UnionPacific (UP) property. And they have been busy installing a storm-sewer junction box in front of the Shell Station at Loop 494.

But the thing most people will notice this week is that two of the four outbound lanes on Northpark at 59 are now closed and will remain that way for several months.

Entry Ponds

I took all the pictures below during the last week of February 2024. For the first time, you can clearly see the outlines of both ponds. Contractors started on the north pond first. So, it is further along. But the outline of the south pond, ringed by transplanted trees, is now also clearly visible.

Looking N at S Pond
Closer shot shows three more decorative areas for plantings, one on each side of the triangle.
Men working on foundation for retaining wall around one of the landscaping areas along Northpark Drive.
Reverse angle. Looking S at N pond.
Retaining wall around area to be landscaped was just completed and contractors were removing forms for concrete.
Pipe for storm drains is being stockpiled in North Pond.

As you can see from these photos, the sides of the ponds will slope toward the middle. Maximum depth for each pond will be about 20 feet.

According to Northpark Expansion Project Manager Ralph De Leon, excavation currently is down to about 7 feet max, the approximate location of the water table. So, the ponds will eventually get almost three times deeper than they are now. That’s a lot of dirt to move!

Contractors will use the dirt to fill in over the box culverts which will go down the center of Northpark. But because of several utility conflicts, placement of the box culverts had to be put on hold.

So, contractors are storing the dirt at the Eagle Sorters Sand Mine on the West Fork. It will be transported back to Northpark when needed.

Stored dirt (center) from entry ponds at the Eagle Mine on Sorters-McClellan Road.

After Harvey, the Army Corps used the Eagle Mine as a placement area for sand and silt dredged from the San Jacinto West Fork.

Once contractors place the dirt over the culverts, they can then begin paving two additional lanes of traffic over where the center ditch used to be.

UnionPacific

Now that all the legal agreements are in place and engineering plans have been approved, work can begin around the UP tracks. It won’t happen immediately though. According to UP, rail traffic is now in its peak season. In the coming months, expect to see three types of activity.

  • Boring under the tracks to take excess stormwater from the entry ponds to the Kingwood Diversion Ditch and Bens Branch via Ditch One.
  • Placement of a one-piece concrete bed/continuous section of track over the project area with signal upgrades
  • Creation of ground-level feeder roads/turn lanes on each side of main lanes which will bridge over the tracks.
ditch one
Looking E at Ditch One, Part of Northpark Expansion Drainage. Northpark is in upper right.

Northpark Expansion Project Lane Closures

Starting yesterday, 2/26/24, two westbound lanes on Northpark at 59 closed temporarily for reconstruction during the next few months.

During the first month, the existing left turn lane and one through lane will remain open. Then traffic will switch onto the newly constructed lanes, while the other lanes are completed. The contractor will install new storm sewer pipes and inlets along with new concrete roadway.

Looking N. Demolition has already begun on two westbound lanes.
At 4 PM on Tuesday afternoon, OUTBOUND traffic on northpark was backed up past Russell-Palmer Road because of the lane closures.

Westbound traffic should expect delays and alternative routes are encouraged.

Judging by the outbound delay I saw today, I plan to avoid this bottleneck for the duration of the Northpark Expansion project.

Other Activity

The Lake Houston Redevelopment Authority (LHRA) and City Councilmember Fred Flickinger are scheduled to meet with the City Attorney on Thursday, 2/29/24, to discuss the Entergy issue. After years of discussion, the utility has not yet begun moving its power lines and transformer out of the way.

LHRA will hold a board meeting on March 14th, in part, to discuss Entergy options.

On Friday, March 15, the City, LHRA and Entergy will meet. Hopefully, they will come to an agreement that doesn’t involve legal action, which could increase costs and cause delays.

Reminder: Phase II Meeting on March 7

Also don’t forget the public input session on March 7 from 5-7 PM. LHRA and TxDOT will discuss plans for the next phase of the project. It will reach past Woodland Hills Drive.

Thursday, March 7, 2024
from 5-7 p.m.
Kingwood Park Community Center
4102 Rustic Woods Dr.
Kingwood, TX 77345

Part of Northpark Phase II

The Northpark Expansion project will not only move traffic faster, it will create an all-weather evacuation route for 78,000 people in the Kingwood and Porter areas. During Harvey, other evacuation routes were cut off.

For More Information

For more information about the project including construction plans, visit the project pages of the LHRA/Tirz 10 website. Or see these posts on ReduceFlooding:

Posted by Bob Rehak on 2/27/24

2373 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.

New Kings River Development Drainage Analysis, Plans Raise Questions

Harris County Engineering has released preliminary drainage plans and a drainage analysis in response to a FOIA Request for a new Kings River Development located along Kings Park Way and Pinehurst Trail Drive. The drainage analysis claims “no adverse impact” on surrounding neighborhoods because of the three detention ponds they plan to build.

But the analysis by R.G. Miller Engineers, which is now under review by Harris County Engineering:

  • Omits data
  • Contains misstatements
  • Leaves out related reports
  • Includes alarming assumptions.

Together, these issues call into question the conclusion of no adverse impact.

In the meantime, the clearing of the Phase-1 site, owned by Meritage Homes, continues, even though Harris County disapproved construction plans for its detention basin.

Looking W. Mertitage Kings River Phase I construction site was about 80% cleared as of 1/29/24 at noon.

Let’s look at each of the issues above.

Data Omitted

Typically, engineers justify “no adverse impact” by comparing pre- and post-development peak-discharge rates. If the post- rate does not exceed the pre- rate, then they claim “no adverse impact.”

But the drainage analysis does not show the pre-/post comparison in a simple table. Why?

Take Tables 7 and 8A, for instance. They address calculations involving Pond 1 on the first section of land now being cleared (see above).

Table 7 from R.G. Miller Drainage Analysis, Page 7. Note blank boxes top left after Existing Peak Discharge.

The data is missing. They omitted the data again in another series of tables later in the analysis.

Drainage Analysis Table 8a, Page 13. Note missing data after “Maximum Allowable Outflow,” line 6.

A third table (1-D, page 8) includes pre-development runoff for all three ponds. Together, they seem to justify the claim.

But I can’t find the peak runoff for Pond 1 by itself in any one of the pre/post comparisons. Keep in mind that the second two ponds won’t be built for years. In the meantime, Pond 1 will be the sole source of mitigation.

Soil Analysis and Environmental Reports Not Completed

Discharge rates also depend on soil types. That’s because the soil on a site affects the rate of infiltration.

But Section 10 on Page 15 of the drainage analysis talks about how a geotechnical report (which would determine infiltration rates) has not yet been produced. It says, “…a geotechnical investigation is required to characterize potential soil conditions.”

The drainage analysis also never mentions the wetlands on the property. Those would normally be addressed in an “Environmental Issues” section. But that section says only, “Environmental investigation has not been completed in this study.”

This is kind of like your jet taking off without a full load of fuel. You might get to your destination, but…

Misstatement?

The report also contains a huge misstatement.

For instance, Section 2.2.3 (Results) begins with, “The detention storage volume required for the proposed 41.5 acres residential development is 26.98 acre-feet per acre.” That would mean they require 11,196.7 acre-feet of detention. But they’re providing only 39.8 acre-feet of storage volume.

I’m sure this is a typo. Another section of the analysis later states that the 26.98 figure is computed by using Harris County’s minimum requirement of .65 acre-feet per acre.

Such misstatements and poor proofing call into question other calculations in the analysis.

Alarming Assumption

Section 2.1 (Existing Conditions) states, “Since the proposed detention ponds outfall to an existing 30-in RCP and 36-inch RCP at Pinehurst Trail Drive, the maximum allowable discharge in this study will be the maximum capacity of the 30-inch RCP and 36-inch RCP.”

That sounds to me as though they feel they can use 100% of the existing storm sewer capacity…without regard to the needs of surrounding neighborhoods. For instance, assume that surrounding neighborhoods already use 75% of existing capacity. If the new development uses 100%, that means the drains would be 75% over capacity.

No Clear Support for Claim of “No Adverse Impact”

Although, they claim “no adverse impact,” it’s not clear to a lay person how they arrived at that assumption.

In fairness this report is still under review by Harris County Engineering.

The development also sits in the City of Houston’s extra territorial jurisdiction.

I hope both entities make the engineers clarify the basis for their claims and produce a final report that the public can understand. I stared at these 47 pages all day and still don’t understand how they can justify “No adverse impacts.”

Is it too much to ask for clarity when the safety of people and their homes is at stake?

Construction Plan of Detention Basins “Disapproved”

Evidently Harris County Engineering had some concerns with this development, too.

On 2/9/24, Engineering disapproved the R.G. Miller construction plans for Detention Basin #1. Engineering kicked the plans back for housekeeping-type issues.

For instance, the plans didn’t contain:

  • ID of the channel the ponds drained into
  • A Project name
  • A Project number
  • The signature and seal of a registered Texas professional engineer (PE).

Harris County used to refuse to review plans that weren’t signed and sealed by a PE. I am told that such gratuitous omissions make reviewers angry.

I would link to all the construction plans here. But the file sizes are massive and the construction plans moot for now. More later when/if they’re approved. For now, to review the entire 45-page, 16 meg drainage analysis, click here .

Posted by Bob Rehak on 2/26/24

2372 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.

Construction Begins on Mercer Stormwater Detention Basin

Harris County Flood Control District (HCFCD) has begun construction of a 512 acre-foot stormwater detention basin upstream from Lake Houston on Cypress Creek near Mercer Arboretum. HCFCD hopes to complete the project in 2024.

The Mercer Project is located on the northeast corner of Hardy Tollroad and FM1960. It stretches north to Cypress Creek. A residential neighborhood borders it on the east.

Clearing the wooded site in Commissioner Rodney Ellis’ Precinct 1 began in January and continues. Meanwhile, it appears that excavation has begun in the portion of the site closest to Cypress Creek.

The projects includes two connected basins. Construction of the north basin appears further along than the south basin.

Mercer Stormwater Detention Basin

Photos of Construction Progress

I took the photos above on Sunday afternoon, 2/25/24. Surprisingly, contractors were hard at work.

Looking NW from over FM1960 toward Cypress Creek and Hardy Tollroad. North Basin will be on right. Start of South Basin is on left. Lower right area contains wetlands.
Mercer Stormwater Detention Basin
Reverse angle looking S toward downtown Houston on horizon. Cypress Creek in foreground. Wooded area on left is designated for floodplain preservation.
Closer shot shows beginning of excavation of north pond.
Contractor is burning downed trees. I did not notice any piles of mulch.
Looking N at more new clearing for South Basin.

Details and Funding for Mercer Project

Both basins will have dry bottoms. An underground equalizer pipe will balance the water level in the two basins, while avoiding the majority of jurisdictional wetlands and streams on the property.

A 54″ outfall pipe will move water back into the creek from the basins after a storm at a rate consistent with pre-construction runoff. A 30-foot-wide berm will accommodate maintenance and future recreational activities such as hike and bike trails.

This project is listed in the 2018 Bond Program as F-88. HCFCD estimated the cost at the time at $25 million, which included land acquisition, design and construction. Construction alone costs $14.8 million.

Funding comes both from the bond and a grant from the U.S. Department of Housing and Urban Development’s Community Development Block Grant Disaster Recovery program.

Benefits

The Mercer Project will lower the water surface elevation in the area shown below during a 100-year flood by .35 feet.

Mercer Project location and benefit limit per HCFCD.

The Mercer project will remove the 100-year area of inundation from 30 structures and the 500-year area from another 17 structures. The homes benefitted extend from the Hardy downstream approximately to Cypresswood Drive.

Impact on Lake Houston Area

I applaud this project because every little bit counts. But three to four inches of flood-level reduction along Cypress Creek will have a much larger impact along Cypress Creek than in the Humble/Kingwood area. Here’s why.

Cypress Creek is just one of 11 watersheds that feed into Lake Houston. Cypress joins Spring Creek just upstream from the US59 bridge over the West Fork. In a 100-year storm evenly distributed across the region, the total runoff volume for each watershed upstream of Lake Houston is almost 2 million acre feet.

This project provides a hair more than 500 acre feet. So, by itself, it will retain only 0.025% of the water running off upstream of Lake Houston.

However, the Mercer Basin will retain 0.27% of the runoff in the Cypress Creek watershed. See table below provided by the SJRA.

Acre-feet of runoff from watersheds upstream of Lake Houston, assuming a 100-year rain uniformly distributed across the region.

A regional drainage study for the Cypress Creek watershed found that flooding along tributaries is predominately caused by stormwater from a rising Cypress Creek backing up into the tributaries. It’s not a lack of sufficient stormwater conveyance or drainage capacity on the tributaries themselves. HCFCD believes stormwater detention basins could reduce that backwater issue.

HCFCD’s Ultimate Recommendation for Cypress Creek

The regional drainage study described here recommends nearly 25,000 acre-feet of additional stormwater detention in the watershed – 50X more than this project provides. It’s unclear where all that land will come from in a watershed that’s already highly developed.

And that dramatizes the need to preserve land along creeks and bayous before it gets developed. That will be a far more cost-effective strategy in the long run.

Posted by Bob Rehak on 2/25/24

2371 Days since Hurricane Harvey

Save the Dates: Diversion Ditch, Northpark Phase II Meetings

Save two dates: March 6 and 7 for important public meetings. These meetings represent your chance to provide input on plans that will affect the future of Kingwood and your family’s safety.

  • Wednesday, March 6, 2024, Harris County Flood Control District will hold a virtual meeting to reveal the recommendations for the Kingwood Diversion Ditch Project. That meeting will run from 6:30 PM to 7:30 PM.
  • The following day, TxDOT has announced a meeting from 5-7 PM, Thursday, March 7, 2024, to reveal plans for the next phase of the Northpark Drive Expansion Project. This meeting has both virtual and in-person options.

For more information on each, see below.

Diversion Ditch Meeting

The Kingwood Diversion Ditch runs down the western side of Kingwood from St. Martha’s Catholic Church to Deer Ridge and River Grove Parks. Along the way, it crosses under Northpark Drive, Kingwood Drive, Walnut Lane and Deer Ridge Estates bridges. Affected homeowner and business associations include:

  • Kingwood Place Commercial
  • Northpark Place Commercial
  • North and South Woodland Hills
  • Kings Mill
  • Kings Manor
  • Trailwood
  • Forest Cove
  • Barrington
  • Deer Ridge Estates

Friendswood originally built the Diversion Ditch to take pressure off Bens Branch, hence the Ditch’s name. Ben’s Branch angles diagonally through Kingwood from St. Martha’s Catholic Churches (old and new), past Kingwood High School and Town Center. It reaches the river between Kings Harbor and Fosters Mill.

The Diversion Ditch and Bens Branch are connected, so one affects the other. Together, they affect half of Kingwood.

Bens Branch shown in red. Diversion Ditch is white. Green is proposed outfall into San Jacinto West Fork

The Kingwood Area Drainage Analysis listed improvements to the Kingwood Diversion Ditch as the most important flood-mitigation project in Kingwood. It affects more people than any other drainage project in the area.

HCFCD’s proposed project alternative recommends:

  • Channel conveyance improvements
  • A diversion structure at the intersection of the Kingwood Diversion Ditch and Bens Branch to divert stormwater into the Kingwood Diversion Ditch
  • Bridge replacements at Kingwood Drive, Walnut Lane, Deer Ridge Estates Boulevard and the pedestrian bridge at Lake Village Drive
  • A new outfall to the West Fork San Jacinto River

Here is HCFCD’s press release on the meeting. The virtual community engagement meeting will be held on:

March 6, 2024
6:30 p.m. – 7:30 p.m.
Join online at: PublicInput.com/Kingwood2
Or by phone* at 855-925-2801 with Meeting Code: 6701

Even if you are unable to attend the live meeting, residents are encouraged to register for the meeting to receive future project updates. A recorded version of the meeting will be available on the Flood Control District’s website and YouTube channel after the event.

To provide comments, fill out the comment form online at www.hcfcd.org/F-14.

Northpark Drive Expansion Phase II Meeting

TxDOT, the Lake Houston Redevelopment Authority (LHRA) and the City of Houston Tax Increment Redevelopment Zone (TIRZ) 10 are soliciting public comments for the next phase of the Northpark Drive Expansion Project.

Phase II will run from slightly west of the Kingwood Diversion Ditch to slightly east of Woodland Hills Drive. Part of the mile-long project falls in Montgomery County and part in Harris County.

The purpose of the project is to address current and increasing traffic congestion. Utility and drainage features will also be upgraded.

And to improve safety for bicyclists and pedestrians, the project will include a new pedestrian underpass and 10-foot wide sidewalks that connect to the Kingwood trail system.

The TxDOT announcement provides a few of the details:

  • To improve commute times, the roadway will expand to three lanes in each direction and include turn lanes.
  • To improve safety, lane width will also increase.
  • The proposed reconstruction will include new signals at the Woodland Hills Drive and Hidden Pines Drive.
  • To improve drainage and make Northpark passable in high water events so Kingwood residents have an all-weather evacuation route.

TxDOT does not anticipate impacting any home or business structures at this time. But strips of property that front on the roadway will need to be acquired. For additional details, see this TxDOT page or a schematic drawing on this LHRA page.

Portion of Northpark Phase II through the Northpark Place Commercial Association. Purple represents additional right of way that will need to be acquired.

Don’t miss this meeting, especially if you live, work or go to school in the northern part of Kingwood.

Thursday, March 7, 2024
from 5-7 p.m.
Kingwood Park Community Center
4102 Rustic Woods Dr.
Kingwood, TX 77345

You can provide public comments by mail or email:

All comments on Northpark Phase II must be received or postmarked by Friday, March 22, 2024.

I’ll cover both of these meetings and provide reminders as the dates approach. Your feedback is important. If you have concerns about the plans, these meetings are the time and place to voice them.

Posted by Bob Rehak on 2/24/24

2370 Days since Hurricane Harvey

Making of a Flood Fortress: The Kingwood High School Story

At a press conference on 2/22/24, elected and appointed officials from all levels of government gathered to celebrate completion of the new flood barriers that surround the entire campus of Kingwood High School (KHS). They transform the once vulnerable facility into a flood fortress and will protect it in a 500-year flood … plus another three feet!

Yesterday’s event marked the successful completion of more than six years of planning, fund raising, and construction that cost more than $78 million.

The Night Harvey Struck

The ceremony began with an emotional narrative by Humble ISD Superintendent Dr. Elizabeth Fagen. She recounted events from the night that Hurricane Harvey struck in 2017 – 2368 days prior.

They included attempts to organize school buses and evacuate people through rising floodwaters and opening schools to give flood victims places to shelter. She also talked about the difficulty of organizing all this in the dark with spotty power and cell phone services as floodwaters rose and began blocking evacuation routes.

Before it was over, the storm caused the Kingwood High School campus to suffer some of the worst damage in the area. Up to six feet of floodwater contaminated with raw sewage remained elevated for seven days. It caused severe interior damage to all four floors of the school and surrounding campus buildings.

4000 Students at Kingwood High School
KHS during Harvey.

Accelerated Remediation Efforts

Then Fagen discussed the heroic effort to remediate flood damage before the school became uninhabitable. In addition to mold remediation and debris removal, workers removed and replaced:

  • Interior wall coverings
  • Insulation
  • Ceilings
  • Floors
  • Stairwells
  • Crown molding
  • Baseboards
  • Air conditioning
  • Cabinets
  • Plumbing
  • Electrical units
  • Other damaged interior and exterior areas of the 585,000 sq ft. facility. 

“Luckily, we didn’t have to wait for insurance money. The District paid out of pocket to get started immediately. Otherwise, the building would have just been not usable ever again. We immediately started paying for everything to be pumped out and torn out, so that the building could be saved,” she said.

Academic Refugees

Finally, Fagen told about relocating 2,782 students to Summer Creek High School for more than a year, the damage to the District’s Ag Barn, the rush to save animals housed there, and the loss of other district facilities.

It was an emotional tale of struggle, survival, and ultimate triumph. All under an ultimatum from FEMA. They told her, “If the high school floods again, it’s on you.”

Features of the KHS Flood-Protection System

All of this set the stage for PBK architects, who designed the flood-protection system that turned Kingwood High School into a flood fortress. They explained the school’s flood-protection features.

The entire campus is surrounded by three types of barriers:

  • Raisable gates, like draw bridges at all the entries
  • Solid, structural concrete walls with the strength of foundations
  • Three-inch thick glass in heavy-duty, aluminum frames with structural sealant.

The combination is actually in use at the National Archives, according to Fagen. Let’s look at each component.

Raisable Flood Gates

Flood gates, that can be raised from a bottom hinge like a draw bridge, form the first element of the system. When down, students walk over them. When up, they form a watertight seal with the surrounding frame.

The diagram below shows the location of 16 sets, one for each entrance.

The dots represent raisable flood barriers. Lines represent structural concrete walls (see more below).
Flood gate raising at main entrance.
Flood gate fully raised seals with surrounding wall.

There are two ways to raise the gates.

  • One requires only the push of a button.
  • The second is automatic – using water pressure.

As floodwater approaches the doors, it falls through inlets in the floor. The weight of the water acts like a counterbalance that begins elevating the gate. The more the water rises, the higher the gate lifts until it is fully closed.

The ingenious system even has a built-in safety margin to prevent wave action from overtopping the gates.

This passive, self-rising approach ensures the building will seal even if a flood happens in the middle of the night, on a weekend, when personnel can’t reach the school, or when electricity might be knocked out.

Structural Concrete Walls

The entire perimeter of Kingwood High School is now surrounded by a continuous, structural concrete wall – as strong as most foundations. However, the casual observer would never know it. That’s because the concrete is covered with a veneer of more aesthetically pleasing brick.

Dr. Fagen shows off the wall construction, both in the diagram and behind her.

Flood-Proof Glass

Finally, note the glass in the photos above and below. It’s three inches thick and can withstand the pressure of eight feet of water. The glass is seated in heavy-duty aluminum frames with structural sealant.

Congressman Dan Crenshaw addressed the assembled dignitaries and press representatives about the cost and value of such a system.

Cost Versus Value

U.S. Congressman Dan Crenshaw, who helped secure much of the funding for repairs and construction of this system, addressed their cost and value.

Crenshaw said repairs cost almost $56 million. Construction of the flood-protection system cost slightly more than $28 million.

In each case, FEMA paid 90%. The Texas Division of Emergency Management and the Humble ISD paid the remaining 10%.

After insurance reductions of $5.5 million, the total cost came to more than $78 million, said Crenshaw. He joked that, for once, everyone now associated with the school knows where their tax dollars went. Then on a more serious note, he added, “These improvements will actually save taxpayers in the long run.”

“We’re avoiding more costly recoveries in the future by eliminating the damage before it happens.”

Congressman Dan Crenshaw, Texas’ 2nd Congressional District

Maximizing Future Potential

At this point, I’ll add an editorial comment. We also shouldn’t forget the incalculable lifetime costs of displacing 2,782 students and disrupting a critical year of their education. How many didn’t acquire crucial knowledge that would help them excel in college and the workforce because of Harvey? We will never know.

But we won’t have to worry about that in the future, because a community came together and transformed Kingwood High School into a flood fortress to protect its children and their future.

Posted by Bob Rehak on 2/23/24

2369 Days since Hurricane Harvey

Trammell Crow Contractor Pumped Silty Stormwater into Street…Again

On Sunday, 2/18/24 at 12:27 pm, Michelle Chavez photographed a Trammell Crow contractor pumping silty stormwater from a construction site into Kings Park Way near West Lake Houston Parkway. The silty water appeared to be routed through a filter bag.

Contractors commonly use such geo-textile bags to remove oil, grease, sediment, litter and debris from pumped water. But this bag had several gaping holes, undermining its effectiveness. No one appeared to supervise the operation.

Chavez said the water stunk badly. There was so much that it blocked one of the two southbound lanes on Kings Park Way.

Photos of Latest Discharge

See Chavez’ photos and video below.

Trammell Crow contractors pump silty stormwater into street. Looking N along Kings Park Way on 2/18/24 at 12:27 pm.
Same location. Same time. Looking S.
Note holes in filter. Also note time/day stamp on photo.

Here is a 27-second video that puts all the pieces together and shows the construction activity in the background.

A second resident told me that the pumping continued into Sunday night…well after dark. Discharging on Sunday and at night can help avoid those pesky County inspectors.

Previous Discharges

This was not the first time the contractors had been caught on camera. Silty stormwater from the site has run into the street on several occasions in the last few weeks:

After the last visit by Harris County officials, they finally started channelling the water away from Kings Park Way.

Photographed on 2/3/24. Diagonal channel is taking water toward a sediment basin.
Some of the water from the SW corner of the site was channeled into a sediment basin. But by 2/13/24, they had filled in the part of the channel….
By 2/20/24, two days after the pumping filmed by Chavez, they had filled in most of the channel and were starting to install storm sewers.

Most contractors plan for stormwater before it rains. What a mess!

Why Controlling Discharges from Construction Sites is Important

The EPA had this to say about the importance of controlling stormwater discharges from construction sites. “When it rains, stormwater washes over the loose soil on a construction site, along with various materials and products stored outside. As stormwater flows over the site, it can pick up pollutants like sediment, debris, and chemicals from that loose soil and transport them to nearby storm sewer systems or directly into rivers, lakes, or coastal waters.”

In this case, the water goes straight into Lake Houston, the source of drinking water for 2 million people.

County Engineering Notified Again

Harris County Engineering has once again been notified of the latest discharge, though the results of their investigation have not yet been reported.

Remind me never to rent an apartment here.

Posted by Bob Rehak on 2/22/24

2368 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.

CoH Public Works Kicks Off Tree Lane Bridge Rehab Project

City of Houston (COH) Public Works Department held a kick-off meeting with contractors and the Bear Branch Trail Association (BBTA) this morning for the Tree Lane Bridge Rehabilitation Project. Public Works and the contractors outlined plans for the project. They also discussed access through BBTA property and safety protocols.

Chris Bloch (left) and Lee Danner (center) of BBTA met with contractor and Houston Public Works representatives at bridge on 2/21/24.

Construction should begin by mid-March and take approximately 150 days.

Project Scope

The $909,000 project will involve:

  • Creating access areas for equipment
  • Removing all existing concrete under the bridge and along the sidewalls
  • Establishing a 2-foot deep by 32-foot-wide low-flow channel from 20 feet upstream to 20 feet downstream of the bridge
  • Rebuilding wing walls
  • Restoring outfalls for local drainage
  • Restoring the work site and replanting trees.

See the construction plans here.

Safety Warning

Contractors will meet with the Bear Branch Elementary School principal to understand normal drop-off and pick-up times. They will then work around those times to try to minimize traffic interference.

Regardless, the City urged parents to warn children to stay away from the construction zone, which will be on both sides of the bridge. Lots of heavy equipment will be maneuvering in tight spaces with limited visibility near Bear Branch Elementary. Observe all traffic warnings and flag men.

Reason for Project

Embankments under the bridge have degraded significantly in the last 10 years. This is largely because of jetting.

Jetting is caused when water backs up behind a bridge that is too small for the volume of water coming down a stream. Pressure upstream of the bridge forces turbulent water to shoot out the downstream side destroying anything in its way. See six images below taken 2/21/24.

Looking upstream at eastern side of bridge. Jetting has blown out concrete under the bridge.
Damaged storm sewer outfall.
Exposed abutment
Downcutting as floodwater tries to make more room for itself.
Jetting continues to erode a large basin south of the bridge.
Note how narrow creek is upstream (Left). Right = effect of jetting downstream.

It Wasn’t Always This Way

The erosion has started in the last ten years and accelerated with upstream development.

In general, developments increase the time of accumulation of runoff. Compared to a densely developed area, when rain falls on a forest, it trickles its way to the creek. But if it falls on concrete and rooftops, it rushes to the creeks through storm sewers.

For illustration purposes, the graph below shows the actual change along Brays Bayou.

time of accumulation
Change in time of accumulation in Brays Bayou as watershed developed over 85 years.

If development were sufficiently mitigated, post-development runoff would be no higher than pre-development. But given the amount of recent erosion, some development upstream from Tree Lane is likely insufficiently mitigated.

I’ve lived near the Tree Lane Bridge for 40 years. For the first 30, erosion was no problem. Now look at it. Compare the two satellite images below.

In 2014, you could barely see creek.
Same area in 2023.

Chris Bloch, an engineer, says that at the time of Imelda in 2019, the open space under the bridge was 500 square feet. The design approved by COH and Harris County Flood Control District will add approximately 64 square feet in the form of a low-flow channel. Contractors will add that where the stream has already downcut.

If the 500 SF estimate is accurate, another 64 SF would represent a 12.8% increase in the carrying capacity of the channel under the bridge.

Will It Be Enough Conveyance?

This will be the second time in three years that the city has repaired the bridge and its embankments.

The state of the bridge now is worse than it was after Imelda, BEFORE the last repair job. And no storms since Imelda have even came close to Imelda’s magnitude. That means insufficiently mitigated development may have played a role in building flood peaks faster and higher; and undermining the bridge.

So, will 12.8% be enough to eliminate more jetting? Only time will tell. Keep your fingers and toes crossed.

Sign Up for Project Updates

You can sign up for project updates by visiting Houston Public Works’ “Engage Houston” page for this project.

Posted by Bob Rehak on 2/21/24

2367 Days since Hurricane Harvey

Entergy Escalates Battle with COH over Northpark

Entergy power poles sit on City of Houston (COH) rights-of-way. The company also runs underground wires in an easement near US59. Yet after years of discussion, the company still has not moved them to make room for the widening of Northpark Drive. Nor did the company comply with a request by the City to say how it would move them by a March 8th deadline.

The Northpark project is intended, in part, to create an all-weather evacuation route for 78,000 people who live in the Kingwood area. Rising floodwaters during Hurricane Harvey cut off escape routes along Hamblen Road, Kingwood Drive, and West Lake Houston Parkway.

Offending Entergy poles where Northpark will be widened for turn lanes next to the bridge over UP railroad tracks.

First Notified in 2020 and Still No Action

On 2/10/24, I detailed how Entergy was first notified about the project in 2020. Yet the company has moved nothing along Northpark to make room for construction. Groundbreaking for the project was last April and construction began last July.

So, COH put Entergy on notice. It wrote a letter, discussed in last week’s LHRA board meeting, that was dated 2/6/24. The letter requested Entergy to submit a proposed schedule and plan by last Friday detailing how it would relocate its facilities within 30 days.

That letter was dated 2/6/24, meaning the equipment should be moved and out of the way by 3/8/24.

Entergy Response Contained Only Hypothetical Schedule

ReduceFlooding.com has learned that Entergy replied to COH Public Works by last Friday as requested. But the reply did not indicate how they would move their equipment by 3/8/24. Nor did it address why Entergy could not meet the 30-day deadline or why the company has taken no action since 2020.

Instead the response suggested Entergy needed many more months, but committed to no firm deadline, according to a COH spokesperson.

Entergy and LHRA had already worked through potential conflicts with other utilities. So, resolving conflicts was not the issue.

I do not have a copy of the Entergy letter to reprint at this time; an Entergy spokesperson refused to provide it, citing potential legal concerns. As a result of the Entergy letter, LHRA has now asked to meet with the City Attorney.

Cost Escalation Possible

Continued delays are escalating the stakes. The Lake Houston Redevelopment Authority (LHRA), which is acting as an agent of the City, has costly contractual obligations to its contractors.

Given the rate of inflation, delays could also reduce the purchasing power of LHRA’s budget. In the last four years, inflation in the construction sector has totaled 15-20%. And this project costs more than $75 million. Yet the original budget included only $3 million for change orders.

A legal battle could take years to resolve. That could needlessly put lives at risk and inconvenience tens of thousands of people daily.

Entergy Motive, Next Steps Unclear

It’s not clear what Entergy – a $4 billion company in Texas alone – hopes to gain through continued delays.

In the past, Entergy asked for compensation to move its poles. But according to an LHRA spokesperson, compensation is not allowable under Texas law because the poles were in a City right of way and not covered by an easement. Thus, any payment would have constituted a “gift of public funds,” which the Texas Constitution prohibits.

Entergy was, however, legally entitled to compensation for moving buried wires in an easement near the Exxon station at US59. Entergy had agreed to move them for $711,000.

Then, within days after the disagreement about payment for relocating the poles, Entergy’s asking price to move the underground wires mysteriously increased by half a million dollars. Simultaneously, their cost estimate went from line item to lump sum – without itemization. Since then, the asking price has increased another $200,000 without explanation.

LHRA has asked to meet with the City Attorney to discuss options and next steps. More news to follow.

For More Information

For more information about the project including construction plans, visit the project pages of the LHRA/Tirz 10 website. Or see these posts on ReduceFlooding:

Posted by Bob Rehak on 2/20/2024

2365 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.

River Bank Collapses, Taking Half of Sand Mine Road

At the abandoned Williams Brothers sand mine on the San Jacinto West Fork, a strip of land – approximately 400 to 500 feet long and up to 50 feet wide – collapsed into the river during the flood in late January.

The dramatic erosion, during a relatively minor (2-5-year) rain event, dramatizes the destructive power of moving water and the need for greater setbacks from the river for sand mines. It also raises questions about abandonment plans for sand mines.

Resident Photo From Boat Shows Collapse

A resident who frequently boats the river and wishes to remain anonymous supplied the picture below. As the resident said, “All that dirt went somewhere. And it didn’t go upstream.”

Looking upstream adjacent to Williams Brothers Mine south of Kingwood Drive

Aerial Shots Show Extent of Damage

From the air, the same location looks like this.

Williams Brothers Mine on right. Eagle Sorters Mine top left. Note extent of fresh sand on left.
Same area from lower angle. Note how trees collapsed into river.
Note also how erosion has eaten half of maintenance road around mine.

Where Trees Once Stood

Compare that with the satellite image below from Google Earth taken last year. Note how there used to be a row of trees on each side of the road. Now, trees remain only on one side.

The measuring tool Google Earth shows the width of the eroded strip was approximately 50 feet.

Most of the trees on the river side of the road are now floating down the river somewhere.

Blankets of Fresh Sand Everywhere

The resident who took the first shot above (the one from the boat) has lived near the river for 40 years. He says he’s never seen so much fresh sand deposited in a flood. See below.

Fresh sand flanks both side of the West Fork. Note trail of trees in water.

The images above show the power of moving water. One cubic foot of fresh water weighs 62.4 pounds. And more than 20,000 cubic feet per second moved down this reach of the West Fork during the peak of the January flood. That’s a lot of force on sandy soil.

We Must Plan for River Migration

That force was magnified by the way a river meanders. On the outside of curves, water accelerates. That extra speed accelerates erosion and creates what geologists call the cut bank.

Conversely, water travels less far and slower on the inside of a curve. As a result, sand is often deposited there in what geologists call point bars. Learn more in this post about Why Rivers Move.

Over time, erosion on one side of a river and deposition on another tends to exaggerate curves. Geologists call that process river migration. River migration already broke through the dike of one sand mine slightly upstream.

During the January flood, water flushing through that mine likely contributed to the buildup of sand blocking the Northpark drainage ditch near Northpark Woods.

Looking upriver along West Fork. Red arrow indicated where West Fork migrated through dike of abandoned sand mine.

Note in the photo above that the Northpark Ditch is now blocked by sand higher than ditch itself. This blockage suddenly appeared during the Jan. ’24 flood. It is backing water up toward Northpark Woods and Oakhurst in the upper right. At least some of the sand was likely flushed out through the breach in the dike above.

Need Greater Setbacks from the River For Sand Mines

As I stated in the beginning, this dramatizes the need for greater setbacks from the river for sand mines. At one time, there was no minimum distance.

In November 2021, after years of work by Bill McCabe and the Lake Houston Flood Prevention Initiative, TCEQ adopted new Best Management Practices (BMPs) for sand mining in the San Jacinto River Basin.

The new rules specify “A minimum 100-foot buffer zone is required adjacent to perennial streams greater than 20 feet wide, 50 feet for perennial streams less than 20 feet wide, and 35 feet for intermittent streams.”

Clearly, that may not be enough. For a list of what other states specify, see the Sand Mining page of ReduceFlooding.com.

Posted by Bob Rehak on 2/27/2024

2363 Days since Hurricane Harvey

Excavation of Second Northpark Detention Basin Well Underway

Since last week’s post about the Northpark expansion project, contractors have made significant progress on the two stormwater detention basins at US59. Contractors are forming concrete retaining walls for both ponds. They have excavated the north pond down to the water table. And, in the south pond, contractors are mounding dirt in three locations for removal and temporary storage.

The ponds are designed to provide storage capacity for excess stormwater that might otherwise flood this crucial intersection. The intersection will provide the final link in the only all-weather evacuation route in Kingwood for 78,000 residents. During Hurricane Harvey, floodwaters blocked both Hamblen Road and Kingwood Drive.

Photos Taken on 2/16/24

I took the following photos at noon on Friday, 2/16/24..

South Pond
Looking NW across the south pond at Northpark and US59. Transplanted trees in foreground.

Contractors are temporarily storying the dirt at the Eagle sand mine on Sorters-McClellan Road. They will later retrieve it to fill in the road bed above the box culverts that are replacing the center ditch down Northpark.

From opposite direction, you can see three mounds of dirt awaiting relocation and the first concrete wall by grass.
Ground level shot shows height of pile.
North Pond

Contractors began working on the north pond first, so it is further along. However, excavation is not yet complete. They will do it in two stages. For now, they’ve excavated down to the water table. When pond liners arrive (any day now), contractors will begin the second phase and excavate even deeper.

Looking NNW at north pond. Note wet areas. They indicate level of water table.

The pipe you see lined up in the photo below will help carry excess stormwater in the ponds to Ditch One which parallels Northpark on the north. From there, it will follow gravity to Bens Branch and the Kingwood Diversion Ditch which will carry it to Lake Houston.

Looking SE at retaining wall for what will become the focal point of the North pond.
Looking S from over north pond at another retaining wall around a grove of trees.
When complete, the ponds should look like this.

CenterPoint Almost Finished Burying New Gas Line

CenterPoint had one westbound lane blocked off at noon today where it was burying a new gas line outside of the City’s easement. Reportedly, the utility is close to finished with the relocation effort. It is replacing one line that used to go down the center ditch with two, one on each side of the expanded roadbed.

As Ralph De Leon, the project manager for the Lake Houston Redevelopment Authority/TIRZ 10 said, “It’s one thing for a company to say they’ll handle something. It’s another for them to show up with giant boring machines to make it happen.” De Leon was happy with the progress they were making.

Still No News from Entergy

Entergy had until the close of business today to respond to the City of Houston’s demand for a plan to relocate its electrical services along Northpark. Project coordinators asked Entergy to move its lines in 2020. But the company has not moved anything to date.

It’s not clear at press time, whether Entergy met the City’s deadline. More next week when I learn more from City Hall.

For More Information

For more information about the project including construction plans, visit the project pages of the LHRA/Tirz 10 website. Or see these posts on ReduceFlooding:

Posted by Bob Rehak on 2/16/2024

2362 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.