New Perry Detention Ponds Held Surprising Amount of Rain Last Weekend

The northern section of Perry Homes’ Woodridge Village now has three detention ponds in various stages of completion. As of a week ago, on May 11, 2020, all three were capable of holding water and did during last weekend’s rains. That meant much rainfall that previously might have overwhelmed the two southern detention ponds had places to hold up instead of overflowing into Elm Grove and flooding residents.

No Record Rainfall, But No Flooding Either

Harris County’s Flood Warning System shows that the area received about two and a half inches of rain last weekend. A 2.5 inch rain is far from a record. But forecasters predicted much more. And some areas to the south and east of Lake Houston got more than 10 inches! So Elm Grove residents lucked out, but they were rightly worried.

In the end, whether it was the additional detention capacity or the lighter rain, no one flooded. And that’s what counts.

The Harris County Flood Warning System shows that the nearest official rain gage to Elm Grove is at West Lake Houston Parkway. It registered 2.52 inches of rain in 3 DAYS.
2.52 inches would have to fall in 3 HOURS to even make this chart, and then it would be something we could expect every year. Source: NOAA

Status of Detention Pond Construction

So what is the current status of construction? As of last Monday, the two ponds on the southern section (S1 and S2) were complete.

Of the three ponds on the northern section:

  • N1 was partially excavated, with most of the capacity in the “tail” leading south toward N2.
  • N2 was about 80% excavated. Workers were expanding the new section and deepening the old section, developed by Montgomery County many years ago.
  • N3 was approximately half complete.
Part of N1 Excavation as of May 11, 2020
Massive N2 pond in southwest corner of northern section. Grassy portion was previously excavated by MoCo, but contractors are deepening it. Photo taken May 11, 2020.
Looking south at Woodridge Village N3 detention pond photo from week ago, May 11, 2020. Elm Grove is out of sight beyond top of frame.

As last week wore on, each pond expanded compared to the three images you see above. Jeff Miller, an Elm Grove resident who lives near Woodridge Village, estimates that all three detention ponds on the northern section were about 80% excavated by the end of last week. However, he also noted that much work remains in terms of sloping the sides, stabilizing soil, building pilot channels and connecting ponds.

Barring further major rains and at the current rate, Miller estimates contractors could finish all three ponds in June.

How They Performed Last Weekend

N1

The first shot below shows the tail of N1. It was not yet connected to N2 so water could not drain out of it.

Photo of N1, looking north, by Jeff Miller on Saturday after rains stopped.
N2

I have no pictures showing how well N2 did at holding back rain, but neither Taylor Gully nor the southern detention ponds overflowed.

N3
Prior to the rain, this portion of N3 was deep enough to conceal all but the top of a large dump truck. N3 might have held approximately 5 feet of water according to Miller.
Additional Culverts for Connecting N1 and N3

Jeff Miller also photographed these 4×4 box culverts stacked up north of N3.

Note the concrete box culverts stacked up north of N3. Plans call for connecting N1 and N2 with such culverts. Also notice how land has been sloped from left to right to flow into N3. See water draining into N3 from a temporary ditch that cuts through the bottom of the image.

Layout and Capacity of All Ditches

Layout of detention ponds on Perry Homes’ Woodridge Village.
This pie chart shows the relative capacity of Woodridge Village detention ponds. In the May flood last year, only the blue pond was complete. By the September flood, Perry had also completed the green pond. The three northern detention ponds hold 77% of planned storage capacity. None of those had even started.

Conclusion

Last week’s rains were a small test. But results showed the work already done has added to to detention capacity.

Miller says that water from the northern section did not appear to spill over into S2. His pictures also showed that S2 was only half full.

That meant the entire rain, with the help of new detention ponds, was able to drain out through a 3 foot corrugated pipe that connects Taylor Gully on either side of the county line, just like it used to.

This is welcome news for flood-weary Elm Grove and North Kingwood Forest residents who feared the worst.

No Progress to Report on the Political or Purchase Fronts

Even though the deadline for a Harris County purchase of Woodridge Village from Perry has passed, and even though Commissioners are not supposed to discuss the buyout in tomorrow’s Commissioner’s Court meeting, Precinct 4 Commissioner Jack Cagle says negotiations are ongoing.

The County made an offer to buy the land in order to build a regional flood detention facility. But the offer was contingent on the City of Houston donating $7 million worth of other property to the Flood Control District to help offset costs. The City also had to adopt County drainage criteria. It reportedly is more conservative than current City standards.

Posted by Bob Rehak on 5/18/2020 with photos and reporting from Jeff Miller

993 days since Hurricane Harvey and 242 since Imelda

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.

Erosion: Sometimes Sudden

Erosion can sometimes be sudden. It’s not always a slow process of water grinding away at dirt and dissolving it, or wearing down rocks. This post will examine several examples around us and look at their implications. I intend it as a continuation of yesterday’s post about ditch maintenance.

The Northpark Woods development (right) on the West Fork San Jacinto River (background)

There are four main types of erosion.

  • Hydraulic action – When rapidly moving water churns against river banks and scours or undermines them.
  • Abrasion – Caused by small pebbles moving along a river bank or bed and knocking other particles loose. Think of sandpaper.
  • Attrition – When rocks carried by the river knock against each other. They break apart to become smaller and more rounded. This is how boulders turn into gravel.
  • Solution – When water dissolves certain types of rocks, for example limestone. We often see this in Florida, where sinkholes frequently develop.

Most of these processes happen slowly. But the first can be sudden. One storm. One flood. And boom. That river bank where you used to sit and quietly contemplate nature is gone.

Now You See It; Now You Don’t

Sometimes large slabs of a river bank or ditch suddenly slump into a river, almost like mini landslides. One flood expert commented on the picture above; he said “The owners of those new homes may suddenly find the ditch in their backyards.”

At other times, the size of a flood forces a river to widen. We saw this during Harvey and Imelda. The relentless pounding of flood waters carries away everything in their path. Cutbanks (the outside of a river bend) are especially vulnerable. Water slams directly into them like a firehose and washes them away. This action actually changes the course of a river over time.

Most of the time, it happens so slowly, we barely notice it. But during large floods, it’s sometimes sudden, large, and devastating to homeowners or businesses near rivers.

Three More Examples of Hydraulic Action

Example A: East End Park
East End Park in Kingwood. In 2019, the San Jacinto East Fork removed approximately 50-100 feet of river bank during Imelda, including this part of the Overlook Trail.
Example B: Balcom House and River Migration
Note a long peninsula south of the Balcom House on the San Jacinto West Fork before Hurricane Harvey.
After one monster storm, the peninsula was gone. The Balcoms lost 175 feet of riverfront property.
Example C: River Aggregate Mine on West Fork in Porter

The third example comes from the abandoned River Aggregates sand mine beyond the new development in the first picture above. It’s a spectacular example of river migration.

In this case, the San Jacinto West Fork migrated 258 feet toward the mine’s dike in 23 years. When I first photographed the dike after Harvey, the river had eaten away an average of 12.4 feet per year. At the time, the dike was only 38 feet wide, and I predicted it could soon fail. It did. Within approximately a year.

Image taken on 9/14/2017, shortly after Hurricane Harvey. At the time, only 38 feet stood between the abandoned mine in the background that the San Jacinto west fork in the foreground.
Note how the pond in the foreground disappeared when the river took the last 38 feet of river bank.

Wait a minute, you say! What happened to the pond. After the river bank collapsed, the pond drained, exposing sediment already within it. And the action of draining concentrated more sediment in it, like all the remnants of food trapped in your sink drain after you’re done washing dishes.

History of Pond

The missing, shallow pond in the foreground above used to be the settling pond for River Aggregates.

This satellite image from 2004 shows that River Aggregates used the missing pond as a settling pond.
This is how the mine looked in 2017 after River Aggregates abandoned it. Note river bank is still intact.
This is how the abandoned mine looked in January of 2019. The river bank was gone. The pond had drained. And a steady stream of silty water from other ponds leaked into the West Fork.

Here’s how it looks today from a helicopter.

River Aggregates mine now leaks a steady stream of silty water into the West Fork San Jacinto. This is the same area as above, but from the reverse angle.

Lessons of Life Near a River

Most people never live long enough to see massive changes such as these in rivers. In most places, river change happens on a geologic time scale. But along the Gulf Coast, hurricanes can create floods that make rivers change on a human time scale, as these examples have shown.

What can we deduce from this?

  1. Around here, we need to give rivers room to roam. Parks, green spaces, and golf courses, often represent the highest and best use of land near a river, bayou or ditch.
  2. Building too close to rivers, bayous and drainage ditches can be costly. Disturbing wetlands and topsoil accelerates erosion. That, in turn, can threaten everything in its path. Be prepared to maintain anything you build near a watercourse, including the watercourse itself. And be prepared to fight what ultimately becomes a losing battle.
  3. We need greater separation between mines and the San Jacinto river. Keep mines out of the meander belt. They worsen downstream sedimentation. And as we have seen, that can contribute to sediment build ups that require public money to remove. The alternative, leaving them in place, contributes to flooding.

Here’s a current list of ditch maintenance projects in the Kingwood area.

Posted by Bob Rehak on 5/18/2020

993 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.

HCFCD Begins New Kingwood Drainage Ditch Repairs

Harris County Flood Control District has quietly started repairs to two more Kingwood Drainage Ditches. The first is G103-33-01, the ditch between Fosters Mill and Kings Point that enters the river near the mouth bar at Scenic Shores. The second is the Kingwood Diversion Ditch, G-103-38-00. It runs down the west side of Woodland Hills, crosses Kingwood Drive by the fire station, then descends to the lake between Trailwood Village and Forest Cove.

Work In Progress as of Monday 5/11/2020

Erosion on the ditch between Fosters Mill and Kings Point that enters Lake Houston near the mouth bar (background) undergoes repair.
Turbulence downstream of weirs, bottom left, commonly results in erosion.
Here’s what the erosion looked like before repairs started. Picture taken in 2018 courtesy of HCFCD.
Close up of eroded drain pipe near weir.

Work on Diversion Ditch Expected to Start This Week

According to Beth Walters of Harris County Flood Control, work on the Diversion Ditch should start this week. Below are several pictures taken of severe erosion that threatens homes and trails.

Looking west at Property in Deer Ridge Estates threatened by erosion of Kingwood Diversion Ditch. Looking west. Picture taken Jan. 2019.
Looking south at the Kingwood Diversion Ditch erosion just south of Walnut Lane. This area is a perennial problem. Photo taken in 2009. Kayakers have dubbed this area the Kingwood rapids. During floods, it offers the only white water experience in Kingwood.

Ditch maintenance includes erosion repairs, silt buildup removal, mowing, de-snagging (removing downed trees), and removing collapsed drainpipes.

Erosion in Kingwood Diversion Ditch near fire station on Kingwood Drive.

Additional details are not yet available on the length of time repairs will take.

Left unrepaired, such erosion can destroy property and trails. These repairs are part of HCFCD’s ongoing maintenance efforts.

Here’s a list of planned maintenance projects on other ditches around the Kingwood area.

Posted by Bob Rehak on 5/17/2020

992 Days after Hurricane Harvey

Perry Contractors Opened Up Woodridge Ditch Hours Before Rain Struck

Thursday evening, I posted about a drainage ditch on the western edge of Woodridge Village in Montgomery County that Perry contractors had partially blocked off.

Last year, residents of Adams Oaks, a Porter subdivision that borders Woodridge Village, say that alterations to that same drainage ditch contributed to flooding dozens of homes twice. Recently, the encroachments on the ditch became more pronounced as construction on the Perry site kicked into high gear.

Encroachment on Adams Oaks drainage ditch by Perry Homes Contractors in Woodridge Village. Note how dirt spills past silt fence still visible in upper right. Picture taken on Monday, 5/11//2020.

With storms and possible flash flooding predicted for Friday and Saturday, nervous residents worried about possibly flooding a third time and expressed their concerns to the contractor. Luckily, the current batch of Perry Homes’ contractors proved far more responsive than the last.

Contractors Clean Out Ditch Friday Morning Before Storm

Friday morning, they started cleaning out and widening the ditch. The rains came that night and into Saturday morning. And the nervous residents breathed a sigh of relief. There was no visible flooding, according to Jeff Miller, who toured Adams Oaks Saturday morning as rain ended.

Miller sent in these pictures of work in progress on Friday morning before the rain.

Looking north. Adams Oaks resident inspects widening in progress on Friday morning. Photo by Jeff Miller taken 5/15/2020.
Reverse angle looking south toward N2 detention pond and Kingwood. Photo by Jeff Miller taken 5/15/2020.

Miller’s pictures make it apparent that the ditch which emptied Adams Oaks is becoming part of a much bigger ditch that extends south from Detention Pond N2. In fact, the old ditch looks as though it will become the backslope interceptor swale for the new, bigger ditch, which is really the tail of the N1 detention pond that helps connect it to N2 and Taylor Gully. See map and photo below.

The newly “rehabilitated” ditch ran along the western (left) edge of Woodridge Village between N1 and N2.
Photo by Jeff Miller taken Saturday morning, shows that the old ditch, left, became the backslope interceptor swale for a much bigger new ditch (right.) This should improve Adams Oaks drainage. Photo take Saturday, 5/16/2020 after about 2 inches of rain.

Regardless, the contractors responded to concerns and scrambled to connect Adams Oaks with their drainage system before the storm.

Standing at the end of Flower Ridge in Adams Oaks and looking west toward Woodridge Village. Photo by Jeff Miller taken Saturday, 5/16/2020.
Further south, you can see east/west drainage from Mace and Joseph reaching north/south drainage on Woodridge. Photo by Jeff Miller taken 5/16/2020.

As additional detention ponds take shape, they will help hold water back from S1 and S2. That may help them prevent overflowing which flooded Elm Grove twice last year.

Status of Sale to County/City

That’s important. By Houston law, any financial transaction greater than $50,000 must be approved by a vote of City Council. And the Council did not consider the donation of land to Harris County Flood Control this week for a Perry deal this week.

You may remember that that was one of two conditions Harris County put on a purchase deal with Perry Homes. And Friday was Perry Homes’ deadline for consummating a deal. However, if the City and County can work something out before Perry finds a private buyer, I assume the land would still be for sale.

The purchase is not on the Harris County Commissioners’ Court agenda for next week.

Posted by Bob Rehak on 5/16/2020 with photos and reporting by Jeff Miller.

991 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.

As Heavy Rains Approach, Triple PG Wastewater Higher on Neighboring Properties Than In Its Settling Pond

Aerial photos taken on 5/11/2020 show wastewater on neighboring properties outside the Triple PG mine in Porter are higher than in the mine’s settling pond. If heavy rains materialize this weekend as predicted, that wastewater could be flushed downstream into the drinking water for 2 million people.

Mine Has History of Dumping and Pumping

Earlier this year, I photographed the mine pumping wastewater from its settling pond toward the neighboring properties. A TCEQ investigation confirmed that wastewater had exited the mine for the fourth time in a year. Investigators found that the wastewater had levels of suspended solids 676% higher than water from nearby White Oak Creek. But they also found that elevation differences had confined the wastewater and kept it from entering the wetlands near White Oak Creek.

Heavy Rains, Flash Flooding Could Flush Water Downstream

However, heavy rains predicted for later today and Saturday could change that. Jeff Lindner, Harris County Flood Control meteorologist says rainfall rates of 1-3 inches per hour will be possible and there is a slight (10-20%) risk of flash flooding, both days. Isolated totals could reach 6 inches on Saturday, he predicts.

How High Is Water On Neighboring Properties

So how high is the water outside the mine compared to inside?

In the photo below, note the two sets of arrows on either side of the road. The strip of trees under the upper right arrow does not belong to the mine. However, the land under the lower right arrow does belong to the mine. I included the second set of arrows because they are closer to the camera and that makes it easier to see the elevation difference in the water. Notice how much higher the water is on the right than on the left relative to the road.

Looking south at Triple PG mine in Porter. Photo taken 5/11/2020.
Looking east over flooded properties (inside tree-line) that neighbor mine. Photo taken 5/11/2020.
Terms of a temporary injunction restrict the mine from using its dredge. So the mine has started dry (or semi-dry) excavation. That meant removing wastewater from this pit. Photo taken 5/11/2020.

On January 20, 2020, I photographed the mine pumping water out of its settling pond toward adjoining properties. See below. The pit above can be seen in the upper left of the photo below.

See the pipe cutting diagonally from the middle of the frame to the lower right. Also note, the pond in the upper left of this image corresponds to the pond in the foreground of the image below. Note water level on January 20, 2020
By February 13, three weeks later, that pond was largely empty. It is common for mines to pump water from one pond to another. But illegal to pump water outside the mine.

Why Mines Should Not Flaunt Rules

If approaching storms flush sediment- and chloride-laden wastewater downstream, it will end up in the San Jacinto East Fork and Lake Houston, the source of drinking water for 2 million people.

This underscores the need for the state legislature to pass laws that move mines out of the floodway. The Triple PG mine actually sits at the confluence of two floodways. That makes it vulnerable and dangerous…especially when an operator apparently flaunts rules designed to protect the safety of the public.

Posted by Bob Rehak on 5/15/2020

990 Days after Hurricane Harvey and 239 since Imelda

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.

Perry Contractors Encroaching on Porter Drainage Ditch West of Woodridge Village

Aerial photos taken Monday this week (5/11/2020) show that Perry Homes’ contractors appear to be partially blocking drainage that serves dozens of homes on the western side of Woodridge Village in Porter. With heavy rain expected this weekend, residents like Gretchen Dunlap Smith are nervous.

Homes Flooded Twice Last Year by Water that Could Not Get Out of Neighborhood

Many of those homes flooded twice last year, in May and September, just as homes in Elm Grove did.

Looking south toward Kingwood along the western edge of Woodridge Village in Montgomery County.

The issue with these homes, however, was that water could not get out of the neighborhood because of altered drainage.

Water drains to the east (left) into the drainage ditch along the perimeter of Woodridge, and then south toward the top of the photo to Taylor Gully.

This enlargement, cropped from the photo above, shows how the perimeter road is pushing into the drainage ditch for homes in the older Adams Oaks subdivision to the right.
Hovering over Flower Ridge in Porter and looking southeast. Note how workers have pushed past Perry’s own silt fence (upper right) that marked the old edge of the ditch and how dirt from construction is now collapsing into the ditch.

Heavy Rainfall Forecast for Saturday

After months of inactivity, it’s gratifying to see workers hustling again. But as the old saying goes, “Haste makes waste.” Forecasters are predicting widespread heavy rains this weekend. Predictions range from 2 to 4 inches, with pockets up to 6 inches.

Jeff Lindner, Harris County meteorologist said this afternoon, “Expect a line or complex of slow-moving thunderstorms to move across SE TX Saturday starting out west in the morning and spreading across the area throughout the day. There will be a low severe threat with this activity, but the main threat will be heavy rainfall. 

As of Thursday, NOAA and the National Weather Service predict heavy rains and possible flash flooding across all of SE Texas.

That gives contractors one day, Friday, to clean out that ditch to avoid another possible flood and more possible lawsuits.

Posted by Bob Rehak on 5/14/2020

989 Days since Hurricane Harvey and 238 since Imelda

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.

Book Review: Houston After Harvey: Stories from Inside the Hurricane by Jacqueline Havelka and Jill Bullard Almaguer

Houston After Harvey: Stories from Inside the Hurricane is an encyclopedic, almost kaleidoscopic collection of interviews with flood victims about their Hurricane Harvey experiences. The new Amazon eBook by two Houston authors, Jacqueline Havelka and Jill Bullard Almaguer, has a “you are there” quality to it. The interviews fall into roughly three categories: before, during and after the storm. 

WhataBurger in Kingwood’s new HEB shopping center during flooding from Hurricane Harvey.

Story of a Natural Disaster Told Through Victims’ Eyes

They recount the stories of people watching in terror as water crept inexorably toward their homes and businesses, praying it would not reach their front doors. They speak of the chaos of emergency evacuations, when people suddenly realized they had waited too long. And finally, they reveal the shock and sadness of returning to often uninsured homes and the struggle to repair them without the financial means to do so. 

Floods like Harvey affect every nook and cranny of the community and local economy. 

Entire Range of Human Emotions

Readers of this book will experience the entire range of the human emotions. Helplessness in the face of nature’s rage. Numbness in shelters. Kindness of strangers. Tears of loss. Rage at looters. Bewilderment when navigating the government bureaucracy. The struggle to return to normalcy. And more. Much more.

The book is not all seen through the eyes of flood victims. A narrative section for the statistically inclined puts Harvey in historical perspective. The storm dumped more rain on the continental US than any other storm in history. Including a whopping 4 feet on Houston, a metropolitan area of seven million people. 

One of the untold stories of Harvey, until now, is how Houston, a sprawling metropolis of diverse interests, came together in one of its darkest moments.

Half the community needed help. And the other half gave it.

Parts of this book will make you smile. Parts will make you cry. 

A Cautionary Tale for the World

If you read the book in one sitting, it feels like a time-lapse video, as if you’re reliving the whole Harvey experience in fast forward. It literally took me back to those terrible days in August and September of 2017.

You never forget an experience, such as Harvey. And you shouldn’t. Even if you want to. Harvey is a cautionary tale for the world about the need to prepare for flooding. Even if you think you live on high ground. Most of Harvey’s victims lived and worked outside of any recognized flood zone.

Recommended For…

I recommend this book to anyone who thinks s/he is immune to flooding. I also recommend it to Harvey victims who want to learn about others who shared their plight. 

Many flood victims may also want to give the book to friends and family in other parts of the country. It will help them understand what it was really like to go through a major flood. And more importantly, what it takes to come out whole on the other side. 

Ms. Havelka and Ms. Bullard have made a huge contribution to the understanding of America’s most common natural disaster – flooding.

Posted by Bob Rehak on 5/14/2020

989 Days after Hurricane Harvey

Note: I have known Jacque Havelka for many years and respect her contributions to the community. She is a talented writer/reporter. Even though I consulted with her when she was planning the book, I have no financial interest in it and will not profit from it.

River Mining Without Permit Goes Without Investigation

On April 21st, 2020, I reported on a sand mine that was river mining in the San Jacinto West Fork without a permit. It’s unlikely that any penalties will result. In fact, three weeks later, neither the Texas Commission on Environmental Quality (TCEQ), nor Texas Parks and Wildlife Division (TPWD), have even investigated the incident. State Representative Dan Huberty is calling on the heads of both agencies to understand why.

No Investigation by TCEQ or TPWD

The operation is called the Spring Wet Sand and Gravel Plant. Multisource Sand and Gravel Co., LTD, based in San Antonio, operates the plant.

I filed a complaint with the TCEQ on April 21. TCEQ referred it to the TPWD for investigation because TPWD regulates sand mining in rivers. Yet Parks and Wildlife did not even investigate the incident.

A TPWD game warden in Montgomery County said, “We need to catch them in the act. And even if we do, the fine is like getting a speeding ticket – inconsequential. It’s only about $500 per dump truck. At this point there’s no way to prove how much sand they removed. A better solution would be to have TCEQ pull their permit. We see these kinds of things right before a mine goes out of business. They just go out there and get the last sand they can get before they leave.”

Spring Wet Sand and Gravel may not have reached the end of operations yet, but pickings are getting slimmer as some of the photos below will show.

Scope of Mining More Apparent in May Photos

Compared to April 21 (when the SJRA was still releasing water from Lake Conroe), a recent flyover on May 11th revealed the full scope of the river mining.

Measurements in Google Earth show the point bar occupied about 7.5 acres. Assuming an average height of three feet, that area held more than 36,000 cubic yards of sand. That would equate to about 3,600 regular dump trucks (10 yards per average load).

At $500 per truckload, that totals $1.8 million. And that doesn’t even include the 8% tax that TPWD gave up on sales. But it’s not worth their time?

You have to catch a lot of hunters and fishermen without licenses to make up that kind of money. You would think it might be worthwhile for TPWD to investigate … even if it’s just half that much. That could probably pay the salaries of at least a dozen full-time employees.

This is just one more in a series of egregious incidents involving Montgomery County and sand mines. They include consistent under-appraisals, intentional breaches, and allegedly polluting the drinking water of 2 million people.

Photo taken on May 11. Looking downstream outside the Spring Wet Sand and Gravel Plant, just south of SH 99.
Closer shot reveals scrape marks from excavator are still visible. See lower right. Also note little pile of orange sand left behind.

The presence of the orange pile in the right foreground may provide a clue as to why the miners did not excavate lower in this location. Sometimes color continuity of sand from batch to batch is important. For instance, when making concrete blocks for a building, owners usually want the color of all the blocks to be uniform.

Looking upstream from the opposite end of the point bar.
The platform used by mining equipment may provide a clue as to the depth of the excavation.
Spring Wet Sand and Gravel plant in the background and road leading to river excavation.
Looking a little more to the south shows the full extent of Spring Wet Sand and Gravel’s operations in the background.
On May 11, the only activity visible inside the entire mine was the dry mining shown above. This may not be the end for this mine, but pickings appear to be getting slimmer.
Spring Wet Sand and Gravel’s main processing facility

State Representative Huberty’s Response

Upon learning that TPWD chose not to investigate the river mining, State Representative Dan Huberty immediately contacted the directors of TPWD and the TCEQ to request explanations. Huberty has fought for a decade to regulate the industry in a way that protects both the public and law-abiding miners.

Dangers of River Mining

The type of river mining shown here is called “bar scalping” by scientists who study the impact of river mining. Some see bar scalping as the least destructive form of river mining. In general, though, most scientists still warn about dangers of river mining.

Immediate and long-term risks include:

  • Increases in river bed and bank erosion both up- and downstream
  • Loss of agriculture land, houses and infrastructure
  • Failure of roads, dikes and bridges
  • Lowering of groundwater reserves
  • Reduction in water quality
  • Reduction in diversity and abundance of fish
  • Changes to riverside vegetation

For those reasons and more, river mining is prohibited in most countries of Europe. According to the World Wildlife Fund, “Europe has shown that developed economies can continue to prosper without resorting to river sand. Its supplies now come from crushed quarry rocks, recycled concrete and marine sand.”

Posted by Bob Rehak on 5/13/2020

987 Days after 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.

Special Steps to Take for Hurricane Preparation During COVID Pandemic

On top of normal disaster preparation advice, FEMA and the CDC have released special instructions this year for hurricane preparation during the COVID pandemic.

Harvey Evacuation by Julie Yandell
Harvey Evacuation by Julie Yandell

First, Cover All the Basics

Most of the basic advice remains the same. For instance:

See more CDC advice at this link.

Second, Protect Your Family from COVID During an Evacuation

This year, there are also some new twists because of COVID.

  • Find out if your local public shelter is open, in case you need to evacuate. Your shelter location may be different due to the COVID-19 pandemic.
  • In your go-kit, include items that can help protect you and others from COVID-19, such as hand sanitizer, or bar or liquid soap if not available, and two cloth face coverings for each person. Face covers should not be used by children under the age of 2. They also should not be used by people having trouble breathing, or who are unconscious, incapacitated, or unable to remove the mask without assistance.
  • Practice social distancing. Stay at least 6 feet (about 2 arms’ length) from other people outside of your household.
  • Follow CDC COVID-19 preventive actions—wash your hands often, cover coughs and sneezes, and follow shelter policies for wearing cloth face coverings. Avoid sharing food and drink with anyone if possible.
  • Follow disaster shelter policies and procedures designed to protect everyone in the shelter, particularly older adults (65 and older) and people of any age who have serious underlying medical conditions. These people are at higher risk for severe illness from COVID-19.
  • Avoid touching high-touch surfaces, such as handrails, as much as possible. If not possible, wash hands or use hand sanitizers containing 60% alcohol immediately after you touch these surfaces.
  • Keep your living area clean and disinfect frequently-touched items such as toys, cellphones, and other electronics.
  • If you feel sick when you arrive at the shelter or start to feel sick while sheltering, tell shelter staff immediately.

Special Advice for Children

To help your children stay healthy in a shelter:

  • Teach and reinforce everyday preventive actions for keeping children healthy.
  • Make sure children aged 2 and older wear cloth face coverings. Face covers should not be used by children under the age of 2. They also should not be used by people having trouble breathing, or who are unconscious, incapacitated, or unable to remove the mask without assistance.
  • Be a good role model—if you wash your hands often, your children are more likely to do the same.
  • Watch your children to ensure they stay at least 6 feet away from anyone who is not in your household.
  • Watch your child for any signs of illness and tell shelter staff if your child may be ill.
  • Try to deal with the disaster calmly and confidently, as this can provide the best support for your children. Help children cope with emergencies.

Improve Your Situational Awareness

For monitoring upstream flooding levels, I find these two sites extremely helpful.

USGS Water on the Go – Includes information from almost every gage in the country. Especially useful if traveling. The app finds your location and automatically links to the gages nearest you.

Harris County Flood Warning System – Includes gages from Harris and surrounding counties, inundation mapping, customized alerts, historical flood levels, and more. Very powerful.

Posted by Bob Rehak on 5/13/2020 with photo by Julie Yandell of her Harvey evacuations

988 Days after Hurricane Harvey

Woodridge Village Turns Into Beehive of Construction Activity

Last year, overland sheet flow from Perry Homes’ Woodridge Village contributed to flooding hundreds of homes in Elm Grove and North Kingwood Forest twice. Construction slowed last fall, but has now turned into a beehive of activity. Just days before a deadline for a deal with the Harris County and the City of Houston to buy the property. Yesterday, dozens of pieces of heavy equipment swarmed over the northern section.

Visible Changes Since April 21st Flyover

Since my April 21st flyover:

  • Excavation of the N1 detention pond started
  • Excavation of the N2 detention pond continues.
  • N3 is surprisingly far along, perhaps 30-50% complete
  • Contractors are filling in wetlands and bogs with dirt excavated from detention ponds
  • They are building a concrete pilot channel down the east/west portion of Taylor Gulley
  • And they appear to be blocking out some roads.

These construction crews appear to have completed more work in the last month than the original contractors did in the last year.

Purchase Deal Faces May 15 Deadline

Perry originally set a May 15 deadline for a City/County commitment to purchase the property. Perry said that if they didn’t receive a commitment by then, they would continue to develop the Woodridge Village property and to try to sell it on the private market.

When Harris County commissioners last met, they put two conditions on a purchase:

  • That the cash-poor City of Houston donate land worth $7 million (half the purchase price) to Harris County Flood Control District, to help defray the cost of other other flood-mitigation projects.
  • That the City of Houston adopt NOAA’s latest Atlas 14 precipitation frequency estimates.

Sources close to the deal believe that if Perry Homes gets a firm commitment by the 15th, that will keep negotiations open.

However, the last City Council meeting before the deadline starts this afternoon (May 12). Donation of land to Harris County Flood Control is not on the agenda. Neither is an Atlas-14 resolution.

Harris County Commissioners Court publishes the agenda this Friday for their Tuesday, May 19th meeting.

Pictures of Work in Progress as of 5/11/2020

Below are pictures of the Woodridge Village work in progress. All were taken on 5/11/2020. It certainly appears as though Perry Homes is hedging its bets in case the City and County don’t come through with an offer. For orientation purposes, the first image shows where detention ponds go.

Location of detention ponds within Perry Homes’ property.
Looking south along the eastern property line of Woodridge Village at excavation of the N3 detention pond.
Looking southeast from the northwest corner of Woodridge near the Webb Street entrance. Shows initial work on the N2 pond.
Looking southeast. Activity is where Mace Street extension into Woodridge Village would go.
N2 Detention Pond Extension
Filling in the bog adjacent to Woodland Hills. Note mud on left side of photo.
Looking north from SW corner. S1 is in foreground. S2 is in upper right. N2 is triangular area in upper left.
A tighter shot looking north along western boundary with N2 in foregroundyou can see three distinct zones of activity.
Hovering over Village Springs in Elm Grove, looking north along eastern property boundary. S2 is in middle and N3 is taking shape above that.
Where Taylor Gully makes a turn north of S2, contractors are installing a concrete pilot channel.
Looking NW across northern section. Taylor Gully is on bottom left. S2 on upper right. Dirt excavated from various ponds is being used to fill in wetlands, center.
Middle of eastern boundary, excavation work continues on N3 and a channel that will lead down to Taylor Gully.

After months of foot dragging, construction activity at Woodridge is now in high gear. Perry Homes says it expects to finish work on the detention ponds sometime this summer.

Sale or no sale, that’s good. Hurricane season is just a little more than two weeks away. These ponds won’t be fully functional by then, but every little bit helps.

Posted by Bob Rehak on 5/12/2020

987 Days since Hurricane Harvey and 236 since Imelda

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.