Lived in home for 3 years and basement has only had water in it once. From when it down-poured for like a week. Water came up through small cracks in the floor. I angle grounded the cracks and want to know if I should use hydraulic water stop cement or self leveling sealant. Floor was repaired once. Not sure when and how long ago. However, where they repaired the floors. Cracks have reappear from when the concrete further settled/moved or whatever. Looking to repair and finish basement. sealant is flexible but not sure if it will hold when/if water come up through the ground. Can’t find a psi rating. Cement has psi rating but not sure if another crack will appear (along the repaired lines) as floor keeps settling.

House is on a slab in north TX.

Had my foundation repaired with +7 piers about a month or so ago. They had a plumbing company come out to do the post repair inspections.

Not too sure what these results (https://imgur.com/bH3rdQE) signify, but what would be the next course of action? I have not noticed any issues with water throughout the house yet

Haemodynamics of atherosclerosis: a matter of higher hydrostatic pressure or lower shear stress?

Xinggang Wang, Junbo GeCardiovascular Research, Volume 117, Issue 4, 1 April 2021, Pages e57–e59, https://doi.org/10.1093/cvr/cvab001Published: 19 January 2021

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Atherosclerosis, Haemodynamics, Hydrostatic pressure, Shear stress, Blood flow

Issue Section: Expert Opinion

Atherosclerosis is prone to large and medium arteries which must bear much higher mechanical force, mainly hydrostatic pressure, shear stress, and tensile stretch. In general, with gradual increase of branches and total sectional area, velocity and pressure of blood will gradually decrease from aorta to capillaries. However, local velocity and pressure of blood might also be different even in the same transection of artery for variations of vessel structure and location. Blood belongs to viscous fluid with certain viscosity in the body. In the large and medium arteries, blood velocity is so fast that viscoelasticity could be negligible. Therefore, the Bernoulli’s equation could be applied to these arteries: P + 1212ρv2 + ρgh = constant or P = constant − 1212ρv2 − ρgh (P: hydrostatic pressure, ρ: fluid density, v: blood velocity, g: gravitational acceleration, h: height). ρ and g are constants in an individual. The essence of Bernoulli’s equation is energy conservation. At any point of per unit mass of fluid micro cluster, the sum of P, 1212ρv2 and ρgh is a constant. Even if the viscosity of blood is considered, the energy loss of blood flow should be very small over a very short distance (few centimetres, Figure 1). In ad

Hi everyone - like many in NJ our basement took on a good amount of water during Wednesday's storm. While the basement is drying out, and before I put in new flooring, I'd like to address the root cause first.

After lots of research and addressing some of the basic items over the last months (i.e. clean gutters, increase slope, downspout extensions, etc.) we still get water in the basement. I'm quite confident the water seeped through the foundation is due to hydrostatic pressure. Only after (consecutive) heavy rains we see water in the basement.

I've increased the slope away from the house by a few feet, but it's now pooling up between ~6-10 feet from the house. Could this be the cause of the water issue in my basement? And if so, will a french drain solve for this?

See attached image with my proposed design.

• The red round spots are proposed drains
• The yellow line is the proposed location for the french drain (dumping water on the driveway; there is not enough slope going to the street). This is where the water normally runs (or sits) during a heavy rain as well
• The blue line is the current gutter extension (to the driveway as well).

In short, before I take on this project, is it likely this will resolve my issue? Or, do I need to dig up the soil right against the foundation wall and install the french drain there (I'd rather not do that). Welcome any other suggestions as well.

Thanks in advance.

Hey, i recently discovered 3 ft of gravel sand dirt mix fill makes up 1/3 of my tiny Philly backyard and all of the walkway between me and the next rowhouse. I was busting up the sinking concrete to regrade and dug to china... Surprise gravel pit below grade.

Is this gravel fill leading water up against my foundation and causing the concrete to sink? Do i have to remove this gravel and replace w the clay based soil here?

Assuming someone is swimming in a humungous box with a small manhole (open to the atmosphere) for entry/exit like in this figure:

https://preview.redd.it/x3epmq3rss171.png?width=1127&format=png&auto=webp&s=5439e63e1c7a0c09dff42eed011075693746cd90

And somebody attaches a 100-m pipe over the manhole, filling it with water but leaving it open to atmosphere, like in this figure:

https://preview.redd.it/n8qvw6jsss171.png?width=543&format=png&auto=webp&s=2ff9d419ae7636e0c30f0e3ea4b7893a7acf5df0

Would this increase the pressure experienced by the diver from 1 atm to almost 11 atm? I know the math is correct but it just feels weird thinking how a thin column not directly on top of the diver dramatically increases the pressure on him, basically killing him.

I would appreciate any input and comments. Thanks!

If I want to calculate the hydrostatic pressure at the dotted level, this equation (in screenshot) is incorrect according to UKittyKat and should be instead just roh*g*h, without the 1 atm contributed from the atmosphere, and I was confused.

https://preview.redd.it/fkqdi4oytkv61.jpg?width=2196&format=pjpg&auto=webp&s=1069a2f4d77731c3a4d6c91915203263e6362640

there is question that requires you to use hydrostatic pressure for the set of questions for static fluid, but hydrostatic pressure is not mentioned in any of the videos i don't think. also what is difference between hydrostatic pressure and absolute pressure??

In the kidney, why would narrowing of the afferent arteriole (effectively, vasoconstriction) lead to decreased hydrostatic blood pressure in the glomerulus? I thought that vasoconstriction leads to higher blood pressure, any intuition would be helpful. The same idea would go for vasodilation of the afferent arteriole. Thanks!

kaplan says absolute aka hydrostatic pressure is P= Po + rho*h*g and Uearth says hydrostatic pressure is P=rho*h*g

I can't figure out which equation to use and when

The military isn't only creating cutting edge weapons technology, but also tech that's going to revolutionize ocean research and preservation. Hopefully, the latter, since it's peace oriented, will continue making the fastest advances.

For some of the newest ideas coming from Navy research in Rhode Island: https://www.navsea.navy.mil/Media/News/SavedNewsModule/Article/2653128/nuwc-division-newport-employees-win-dr-delores-etter-top-scientists-and-enginee/

Hi everyone!

I'm currently doing a research project on HASEL actuators (you can see what it is here). I'm basically at the finish line, however, there is this problem I can't solve and my brain is fried. It may have a really simple solution but I don't seem to find it.

A bit of necessary info:

Basically, a HASEL actuator is a polymer shell filled with liquid dielectric, which is then partially covered with electrodes. This is connected to a high-voltage generator and due to an effect called Maxwell stress, the liquid inside gets displaced to the surrounding volume inside the shell. Furthermore, the electrostatic forces between the electrodes overcome the hydraulic pressure of the liquid dielectric and the stiffness of the polymer shell and subsequently pull in to each other.

My problem is in fact to know what voltage is needed for this pull-in event to happen. However, after much thought, I didn't seem to find a way to calculate it. For this reason, I wondered if I was thinking about it wrong. Maybe I have to find the electrostatic force needed to overcome the hydrostatic pressure and plug in different voltage values to find the answer.

I hope this post made sense, it's 11pm here and I'm so tired. Whatever information you need just ask.

Thanks in advance!

This is from Uearth

"Increased blood speed or decreased blood viscosity would both result in greater volumetric blood flow. This would reduce blood hydrostatic pressure and decrease net fluid filtration (ie, less fluid moves out of the capillary)."

1. is volumetric blood flow same as "Q" in the equation Q = Av? so that's why increase blood speed increase volumetric blood flow?
2. Also why increase volumetric blood flow would decrease hydrostatic pressure? I thought increase blood volume would increase hydrostatic pressure?

This exact equation was asked a month ago from another thread.

https://www.reddit.com/r/Mcat/comments/m3nku4/hydrostatic_pressure_and_volumetric_flow_rate/

It would be greatly appreciated ☺️!

Hi,

I'm trying to simulate a box that's partially underwater. I'm using the hydrostatic pressure formula (-water density*g*y), however that results in faces that are in the positive side of the Y axis being under pressure in an opposite direction (as if there's water inside the box). I'd like those faces to have no pressure applied to them at all. That it, to limit the pressure to the negative Y axis only.

How can I do that?

Thanks.

https://preview.redd.it/p51mkrwrflm61.png?width=811&format=png&auto=webp&s=386bdb89643119e6b4a293653274435b03ad89e4