Tag Archive for: stormwater detention

Woodridge Village Excavation Surpasses 100,000 Cubic Yards

In the four weeks since my last update, Harris County Flood Control District’s (HCFCD) contractor has excavated another 11,000 cubic yards of dirt from Woodridge Village. That means Sprint Sand and Clay has removed a total of 104,000 cubic yards since it started work under its Excavation and Removal Contract a little more than a year ago.

Sprint is removing the dirt from what will become a sixth stormwater detention basin on the former Perry Homes site. The lack of adequate detention capacity on the site contributed to flooding hundreds of homes in Kingwood twice back in 2019, before HCFCD purchased the property.

New Excavation Already Second Largest on Site

Already, at 62 acre feet, the new basin ranks as the second largest stormwater detention basin on the 268-acre site. Woodridge Village’s five original basins had the following capacities:

  • N1 = 13.2 acre feet
  • N2 = 154.7 acre feet
  • N3 = 42 acre feet
  • S1 = 18.6 acre feet
  • S2 = 42.5 acre feet

The new detention basin could more than double capacity on the site. Ultimately, it will exceed Atlas 14 requirements.

Here’s where the original five are located.

Locations and sizes of first five stormwater detention basins shown in blue.

The new basin will go between N2 and S1.

Woodridge Village Excavation and Removal
Location of new basin outlined in red.

Progress by the Numbers

The 11,000 cubic yards excavated in the last 28 days averages 2,750 cubic yards per week. That’s an increase of 220 cubic yards per week compared to the previous month. It’s also 1,000 cubic yards per week more than the weekly average since the start of the contract.

The current monthly rate more than doubles the minimum required under Sprint’s contract.

The excavation of 100,000 cubic yards marks yet another milestone. Sprint has now removed more than 20% of the 500,000 cubic yards allowed under the contract.

February vs. March Photos

To get a feeling for just how much 11,000 cubic yards is, compare these photos taken at the ends of February and March.

Extent of excavation for new Woodridge Village Detention Basin as of 3/5/23
End of February
End of March: excavation stretches much farther into the distance.

A Head Start on Construction

In December 2022, HCFCD revealed the results of its analysis of alternatives to reduce flooding adjacent to Woodridge and Taylor Gully. HCFCD is now working on finalizing those plans.

Excavation and removal contracts give HCFCD a head start on construction while engineers finish plans. This compresses the timetable.

The contract also saves taxpayers money. It gives Sprint the right to remove up to 500,000 cubic yards for a grand total of only $1000. Sprint makes its money by selling the dirt at market rates to home- and road builders. The only restriction: the dirt can’t be placed in the floodplain.

Posted by Bob Rehak on 4/4/2023

2044 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.

Three More Major Projects on Greens Bayou Completed Recently by HCFCD, Army Corps

Tuesday, I posted about three Harris County Flood Control District (HCFCD) floodwater-detention projects in construction on Greens Bayou. But HCFCD and the Army Corps recently completed three more. All three in the latter category started in 2015 – before the flood bond.

Magnitude of Recent Mitigation Investment on Greens

Looking at all six (in construction + recently completed) helps one understand the magnitude of investment in this watershed during the last six years.

The combined cost of all six projects totals more than $222 million.


The map below shows the locations of the recently completed projects in black; those still in construction are red. This post will focus on #4, #5 and #6 below.

#4, #5 and #6 represent three projects started in 2015 and recently completed.

#4: Greens Bayou Federal Flood Risk Management Project

The Greens Bayou Federal Flood Risk Management Project, also known as the Antoine Stormwater Detention Basin, lies just east of the Cutten Basin, discussed Tuesday. The U.S. Army Corps of Engineers Galveston District (Corps) and Harris County Flood Control District broke ground in 2015. Phase I cost $58 million. Phase II cost $21.4 million. And channel improvements cost $5.7.

Location of stormwater basin shown in yellow. Cutten basin is to left. Orange brackets show scope of channel improvements.

Phase I included approximately 3.7 miles of channel conveyance improvements from Cutten Road to Veterans Memorial Drive and approximately 108 acres of stormwater detention storage near the intersection of Antoine Drive and Beltway 8.

Phase II construction began in late 2016. It included completion of the north cell of the basin, located north of West Greens Road and excavation of the south cell, which is located south of West Greens Road.

From Google Earth Pro. Most recent satellite image is from 2/11/2019. For more recent construction shots, see below.

The Corps designed and built the project. It also planted trees, shrubs, and grasses on disturbed areas. These features will improve stormwater quality, support wildlife and provide opportunities for recreational benefits.

West Greens Drive bisects the Antoine basin, dividing it into two parts. However, box culverts connect them and they function as a single detention pond. The completed basin holds approximately 1,650 acre-feet, or 538 million gallons of stormwater. To put that in perspective, it holds a foot of rain falling over a 2.5 square mile area, or half a foot falling across 5 square miles!

Looking SW at the Antoine Stormwater Basin on Greens Bayou. Greens Drive bisects the project. Beltway 8 North is in background. Greens Bayou flows diagonally through the frame from right to left. Photographed on 4/22/2021

As part of a cost sharing arrangement, the Flood Control District purchased the 138-acre detention basin site. HCFCD also acquired other property and easements, and relocated utilities. The District will maintain the basin and channel in perpetuity.

#5: Kuykendahl Stormwater Detention Basin

Kuykendahl Stormwater Detention Basin sits on a 288-acre property near Kuykendahl Road and Ella Boulevard along an unnamed tributary of Greens Bayou.

The Kuykendahl Basin is the top purple area.

Contractors removed 3.61 million cubic yards of soil from the site. It holds 2,325 acre-feet, or 757.6 million gallons of stormwater. That’s a foot of rain falling across 3.6 square miles, or half a foot falling across 7.2.

2019 satellite image from Google Earth Pro of Kuykendahl Basin still under construction.

Following construction, contractors planted 22.19 acres of native tree and shrubs, and 12.79 acres of stormwater quality-treatment wetlands. They also created 14.04 acres of other wetlands to replace those impacted by construction.

What the Kuykendahl Basin looks like today, complete with picnic area.

Native, woody, riparian vegetation stabilizes banks, shades water, and creates habitat for birds.

FEMA awarded $39.2 million to the Harris County Flood Control District, under the Hurricane Ike Hazard Mitigation Grant Program (HMGP), for construction of this and another stormwater detention basin (see #6 below). The Flood Control District contributed matching funds for both projects. 

Ceres Environmental Services Inc. constructed the two basins for $63.7 million. Combined, they were the largest construction contract ever managed by the Flood Control District up to that time. The two basins reduced or removed flooding risks and damages from more than 1,100 structures along Greens Bayou. “Avoided damage” exceeds $90 million in every flood. 

Both projects (#5 and #6) are part of Progress Greens, a suite of flood damage reduction projects in the Greens Bayou watershed. All projects under the Progress Greens umbrella will function together to reduce flooding risks and damages for residents and businesses within the 213 square miles of the Greens Bayou watershed.

#6: Glen Forest Stormwater Detention Basin

The Glen Forest Stormwater Detention Basin lies southeast of the Kuykendahl Basin on a 160-acre site east of Interstate 45 and slightly north of Beltway 8. See P500-08-00 in the map below.

The Glen Forest project is at the purple location on the right.

The Glen Forest Basin project removed approximately 2.15 million cubic yards of soil in three connected cells. The completed basin holds approximately 894 acre-feet, or 291.3 million gallons of stormwater. That’s 1.4 square miles one foot deep or 2.8 square miles a half foot deep.

2019 satellite image from Google Earth Pro of Glen Forest Detention Basin at Beltway 8 North and 45 while still under construction.

Basin design included 2.75 acres of native tree and shrub plantings and 0.81 acres of stormwater quality treatment wetlands. 

Natural-channel design features, such as those in #5 above, provide environmental and water-quality enhancement.

The finished project today. Looking WNW from Imperial Valley Drive and Greens Road toward I-45 in background.

Regulation Vs. Mitigation

Areas both up and downstream from these ponds have extremely high-density commercial, industrial and residential development. Drive up Kuykendahl or Imperial Valley, for instance, and you will find mile after mile of apartment complexes. There’s little room for water to soak in during rainstorms.

More sensible development regulations that mandated onsite detention ponds when this area was being built might have prevented a lot of flood damage and heartbreak. Mitigating flood issues is always far more expensive, difficult and time consuming than preventing them. And many times, mitigating them after the fact is not even possible because of the shortage of land.

Value of Coalitions and Cooperation

Projects like the three above don’t happen without the combined efforts of elected representatives at the county, city, state and federal levels, plus community groups such as the Greens Bayou Coalition (GBC).

According to Jill Boullion, former director of the GBC, “The GBC advocated for $55 million in USACE funding from 2009 to 2015 for the Antoine Basin (Project #4) alone. We made many trips to DC, Galveston and Dallas to meet with elected officials, US Army Corps, Office of Management and Budget, and others. The Obama administration finally approved the funding! That was my first advocacy project and, boy, did I learn a LOT!!!”

The moral of that story: never underestimate the value of coalitions and cooperation in moving these projects forward.

Posted by Bob Rehak on 4/22/21

1332 Days since Hurricane Harvey