Category: Urban Systems

The New York-New Jersey Harbor and Tributaries Study (HATS)

The New York-New Jersey Harbor and Tributaries Study (HATS)

The New York-New Jersey Harbor and Tributaries Study (HATS)

10/05/25

“How is the New York-New Jersey Harbor region preparing for coastal storms?”

Hurricane Sandy shook the New York-New Jersey region in 2012. Dozens of lives, tens of thousands of homes, and billions of dollars were destroyed by the storm. This prompted many localities to reconsider how they will prepare for the next big storm event. The New York-New Jersey Harbor region is working with the U.S. Army Corps of Engineers to investigate risks and amelioratory actions through The New York-New Jersey Harbor and Tributaries Study (HATS). The HATS project looks to identify water resources problems and opportunities, existing and future conditions, and plan formulation/evaluation/comparison/selection. The US Army Corps tentatively plans to focus on the East Riser Ditch Channel in New Jersey and the Harlem River and Oakwood Beach in New York. 

Soil Boring Tests

Soil Boring Tests

Soil Boring Tests

10/04/25

“How can we determine the conditions and composition of the soil beneath our feet?”

Construction projects are usually built over soil. The soil’s properties have a sizable impact on the project’s design. To understand the soil conditions and composition, people can drill a hole into the ground, extract a soil sample, and then analyze the results. These Soil Boring Tests are an essential part of construction activities, helping people understand a multitude of important information, ranging from stormwater infiltration rates to support stability.

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Hard Water

Hard Water

Hard Water

10/03/25

“What’s special about water with high mineral ion content?”

Water will change depending on what it’s exposed to. When water percolates through limestone, chalk, or gypsum deposits, it might pick up ions such as calcium and magnesium. When this Hard Water comes into contact with soap, the fatty acids can react with the minerals to create a chalky precipitate that sticks to surfaces, leading to difficulty in cleaning, plumbing, appliance performance, and HVAC heating system efficiency. Water softening can reduce a water’s hardness

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Collect Pond NYC

Collect Pond NYC

Collect Pond NYC

10/02/25

“How did a former pond have a massive influence on the development of Manhattan?”

When we think of Manhattan, we imagine tall skyscrapers resting upon impervious concrete and flanked by hordes of honking cars in one of the most densely populated parts of the world. But hundreds of years ago, when Manhattan was under its rightful indigenous land stewardship, the island was mostly lush forest with plentiful fresh water. On the lower end in what is now Chinatown was a body of water that the colonizers later called Collect Pond. The A subdivision of the Lenape people lived in a settlement by the southwestern shore of Collect Pond. A while after the land was stolen by Europeans, the pond was used for fishing and later a summer picnic and winter ice skating rink. Businesses later discharged their contaminated wastewater into the pond, resulting in severe public health hazards. The city decided to drain Collect Pond by building a canal to the north and filling the pond with soil in 1811. This development paved the way for the creation of the modern Canal Street in New York City, forever altering the structure of the metropolis.

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Microirrigation

Microirrigation

Microirrigation

10/01/2025

“How can we make more optimal irrigation techniques using a low-pressure, low-flow approach?”

Traditional irrigation techniques might result in landscape overwatering, leading to wasted water and damage to foliage. We can avoid these issues if we apply more efficient, low-pressure, low-flow-rate techniques that bring water directly to the roots of a plant. These Microirrigation techniques can save large percentages of water applied to the system.

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Volatile Organic Compounds

Volatile Organic Compounds

Volatile Organic Compounds

09/27/25

“What makes chemicals that have high vapor pressures at room temperature special?”

Substances with high vapor pressures become gases at low temperatures. Carbon-containing substances with high vapor pressures are classified as Volatile Organic Compounds, or VOCs. There are upwards of over ten thousand VOCs identified, ranging from perfumes to greenhouse gases. VOCs are the sources of most of the scents that humans can smell, and many VOCs contribute to air quality issues.

CT Value (Water Disinfection)

CT Value (Water Disinfection)

CT Value (Water Disinfection)

09/26/25

“How can we quantify the effectiveness of chemical disinfection treatment?”

Chemical disinfection processes have a wide range of effectiveness. But what variables govern how much impact a certain process has? Well, it turns out by multiplying the concentration (C) in mg/L of a chemical by the amount of contact time (T) with the water, we can obtain the CT Value. While increasing concentration is generally helpful for CT values, it can also increase chemical byproducts, making increasing contact time more effective. Water treatment operators have lab data giving the CT values needed to destroy specific microorganisms.   

Filter Backwashing

Filter Backwashing

Filter Backwashing

09/25/25

“Why can we clean filters by pumping water backwards?”

Filters collect trapped material over time. Sometimes this piles up so much that it hampers further treatment. To solve this, infrastructure operators can pump water in the other direction to remove water from filtration. This Filter Backwashing is vital for treatment maintenance.

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Rapid Mixing for Water Treatment

Rapid Mixing for Water Treatment

Rapid Mixing for Water Treatment

09/24/25

“Why is it important to rapidly mix water at the beginning of the coagulation process?”

Coagulation mixes coagulants with suspended particles to form larger, charge-neutralized molecules. However, the mixing needs to occur quickly (usually less than a minute) to ensure the coagulants are evenly distributed and the suspended solids are destabilized to effectively clump together during flocculation. This Rapid Mixing for Water Treatment is the first part of the larger coagulation-flocculation process, and is an example of how the brilliant systems that underpin everyday life for many.

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