Hydraulic Gradient Lines vs Energy Gradient Lines

Hydraulic Gradient Lines vs Energy Gradient Lines

Hydraulic Gradient Lines vs Energy Gradient Lines

03/07/26

“What is the difference between a fluid’s hydraulic gradient line and energy gradient line?”

Engineers often have to compute the hydraulic gradient line and energy gradient line for fluid flow. But what is the difference between them, and why does it matter? Well, the hydraulic gradient line represents how high the fluid would rise if a piezometer tube were placed at a specific point, given by the summation of pressure and elevation for a given fluid. The energy gradient constitutes the total energy of a fluid at a particular point, given by the summation of pressure, elevation, and velocity. The difference between the hydraulic line and the energy gradient line is the fluid’s velocity. One of the reasons why these are different is that it shows how the stored energy of the hydraulic gradient and the energy of motion of velocity are separate quantities, and another is that we often need different tools to measure the hydraulic gradient and velocity of a system, so we can combine them to find the energy gradient line. This is the difference between the Hydraulic Gradient Lines vs Energy Gradient Lines.

Underground Storage Tanks for Waste

Underground Storage Tanks for Waste

Underground Storage Tanks for Waste

03/06/26

“Why do people use underground storage tanks for waste?”

Waste is a massive problem for communities all over the world. Storing it above ground can take up space, cause public health problems during inclement and windy weather, emit perilous odors, and destroy visual aesthetics. So how can we use our engineering and planning mindsets to solve this? Well, what if we were to store waste underground? This can come in the form of Underground Storage Tanks for Waste. According to the U.S. EPA, underground storage tanks for waste are tanks and any underground piping system connected to the tank where at least ten percent of the combined volume is underground. Underground storage tanks for waste can address the aforementioned problems associated with surface-based waste management, and can store fluid waste more easily. However, waste managers must take extreme precaution with underground waste storage tanks because their structures can corrode or break and leak into the surrounding soil and groundwater, creating health crises. It’s best to choose long-lasting materials for building underground waste storage tanks.

Image credit: https://rivcoeh.org/

Soil Infiltration vs Transmission Rates

Soil Infiltration vs Transmission Rates

Soil Infiltration vs Transmission Rates

03/05/26

“What is the difference between soil infiltration and transmission rates?”

Soil infiltration and transmission rates are often discussed interchangeably. However, there are big differences between them. Infiltration rate measures how quickly water enters soil from the surface, while transmission rate calculates the movement rate of water through soil. Soil infiltration rate is influenced by surface conditions and the level of soil inundation, while transmission rates are governed by soil permeability. This is the difference between Soil Infiltration vs Transmission Rates.

The NCEES Model Rules

The NCEES Model Rules

The NCEES Model Rules

03/03/26

“What models the rules and regulations for U.S. engineering and surveying licensing boards?”

The NCEES Model Law defines the powers and duties of U.S engineering and surveying licensing boards. But it’s not complete by itself. The boards also require rules and regulations for member boards to implement the concepts defined in the law. These come in the form of The NCEES Model Rules. As an analogy, the NCEES Model Law is like defining a tool, while the NCEES Model Rules explain how to use the tool.

The NCEES Model Law

The NCEES Model Law

The NCEES Model Law

03/03/26

“What defines the powers and duties of U.S. engineering and surveying licensing boards?”

In the U.S., obtaining an engineering or surveying license is incredibly important to practice these professions in public service. Each state has its own licensing board that governs how engineers and surveyors are licensed to safeguard the health, safety, and welfare of the public. To help develop suitable and uniform licensing laws across all states, the National Council of Examiners for Engineering and Surveying (NCEES) has developed The NCEES Model Law to define licensing boards’ powers and duties. 

RCRA Listed Waste

RCRA Listed Waste

RCRA Listed Waste

03/02/26

“Is there a US EPA list that tells us if a particular waste is hazardous?”

The Resource Conservation and Recovery Act (RCRA) classifies how the US EPA handles waste. Title 40 of the Code of Federal Regulations (CFR) in part 261 has four lists, the F, K, P, and U lists, that delineates if a particular type of waste is hazardous. It’s important for American waste producers to check if they’re creating RCRA Listed Waste.

Resource Conservation and Recovery Act (RCRA)

Resource Conservation and Recovery Act (RCRA)

Resource Conservation and Recovery Act (RCRA)

03/01/26

“How does the U.S. federal government regulate solid and hazardous waste disposal?”

Solid and hazardous waste needs proper disposal and maintenance to protect public health. In 1976, the U.S launched the Resource Conservation and Recovery Act (RCRA) to administer “cradle to grave” requirements for hazardous waste landfill/disposal criteria for non-hazardous solid wastes.  

Resource Conservation and Recovery Act (RCRA) Sampling

Resource Conservation and Recovery Act (RCRA) Sampling

Resource Conservation and Recovery Act (RCRA) Sampling

02/28/26

“How do we sample waste to make sure it isn’t hazardous?”

Proper waste disposal is important for keeping the local environment clean. Under the US Resource Conservation and Recovery Act (RCRA), waste generators must determine if their waste is hazardous. If there’s uncertainty about the waste composition, then waste generators must take samples to labs to determine if the waste is ignitable, corrosive, reactive, and/or toxic. Because waste samples can vary widely in contaminants, the waste generator must apply statistical sampling procedures. This means determining the mean, standard deviation, probability of detecting contamination if it truly exists, confidence that our conclusion is correct, the smallest difference from the regulatory standard that we want to detect, and the number of samples needed. Resource Conservation and Recovery Act (RCRA) Sampling is a vital part of determining waste hazards in the U.S.

Suspended Growth Wastewater Treatment

Suspended Growth Wastewater Treatment

Suspended Growth Wastewater Treatment

02/27/26

“How can we treat wastewater with free-floating microorganisms?”

There are many ways to go about wastewater treatment. One of the most common categories is for microorganisms to float freely in wastewater and consume pollutants. This Suspended Growth Wastewater Treatment is an effective way to treat wastewater through mixing the right microorganisms. Activated sludge treatment and aeration lagoons are examples of suspended growth wastewater treatment.

Image credit: https://www.waterandwastewater.com/