# What is Water level: Definition and 78 Discussions

Water level, also known as gauge height or stage, is the elevation of the free surface of a sea, stream, lake or reservoir relative to a specified vertical datum.

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1. ### Calculate water level with conditions open to environment (static head)

Hi all, I have a challenge with solving a simple question: Will water exit the flare I have a vertical pipe (40 meter with diameter of 1100mm) with the following connetions: - At the bottom: bend reducer to 514mm and approx. 100 meter length - At the top: 750mm pipe that goes up another 30...

3. ### Does Throwing an Object Overboard Affect Pond Water Level?

I was asked this question: Assume you're sitting in a boat (you and the boat, together, are a mass M) which also contains a heavy object (of mass m). The boat (inc. you and the heavy object) is floating in a pond (a fixed body of water, rather than open sea). If you throw the object overboard...
4. ### Chemistry Adding sugar to water; water level doesn't go back to the original volume

What are we missing in this experiment? Thanks
5. ### Related rates: water level in a cone

Firstly I'm having trouble understanding what water level means. I tried a quick google search and got the following: " water level(Noun) The level of a body of water, especially when measured above a datum line. " That doesn't help me. Is water level the distance from the base to where the...
6. ### Building a Cheap, Portable Water Level Recorder for Seiche Monitoring

I want to build a cheap, portable water level recorder so I can record the "seiche" on my lake (and other lakes). I don't want to use fancy components like Arduino boards. And I want it to be portable (and cheap enough that losing it to water, weather or thieves won't be a heartbreak.) There's...
7. ### Will the displacement of a solid ball affect the water level?

(The picture below is my drawing. I followed the instructions of the problems and drew for reasons of clarity.) Let me start by writing down the given details : Volume of drum ##V_D = 0.05 m^3##, mass of drum ##m_D = 5 kg##, height of water column (initially) ##h_W = 1 m##, base area of water...
8. ### Water level in a submerged closed vessel after it is turned upright

Hello all, I need Your help with one real / theoretical situation. We have submerged pipe filled with air at atmospheric pressure that is closed on both ends. The hole is formed on one pipeline end and the water starts flooding the pipe. Let's assume pipe is tilted somewhat and that no air...
9. ### How can I prevent increasing capacitance on my homemade sensor?

Hello, I have made a capacitive water level sensor. It is a parallel plate capacitor. While measuring the capacitance of my sensor, I measure 53 pF. I then leave it for couple of minutes, still conected to the meter, capacitance then rises to 54 pF. Capacitance is slowly increasing. Why is...
10. ### Calculating the capacitance of a capacitor

Summary: Two plates side by side, not parallel to each other. Hello everyone, Purpose of this capacitor is to detect changes in water level. It is constructed of a single copper plated pcb on which middle I have made a 1 mm of space separating now two copper plates on a single pcb. So, plates...
11. ### How will melted ice in a pool change the water level

if I have a pool that is 20x20 surface area and I put a 200 gallon block of ice it, the water level will go up by X amount. when it melts how much will the water level change?
12. ### Water Level Sensors: Strange Behavior?

HI All, Has anyone experienced strange behavior with capacitive level sensor? They fail (not detecting fluid) at certain point and after leaving them alone for couple of days start working?
13. ### Water level accuracy revisited

Is there any difference in accuracy with using a resivoir vs just the tube? I want to acurately level the torque boxes on my car on jackstands so i can make frame measurements. Thanks
14. ### Why does water level stay the same when ice melts inside the water?

I feel so stupid, intuitively, when we were having this discussion I wanted to say that the level stays the same but when we were discussing with the person beside us, my partner said it would fall because water expands when it freezes, so when it melts, there'll be less displacement, so the...
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### Water level rise in a tank, continuous flow in, high exit

Homework Statement : See below paragraphs[/B] Homework Equations : I'm not sure on which equations I need.[/B] The Attempt at a Solution : I'm so sorry, this really isn't my strong point. Using the figures below, the tank surface is 113.184 sq in. The side pipe has a cross section area of 3.14...
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### Can someone help me find a method to measure water level in a tank

At the outset I am a novice in physics. i have constructed a rain water storing tank with a capicity of 1,20,000 litres. I propose to seal the tank so that there is no light penetrating inside the tank. My question now is how do I measure how many feet of water is left inside the tank? Can...
17. ### Water level accuracy for squaring a car frame

I have a 1968 Mustang that I bought at auction from my grandfather's estate it is almost completely apart and I want to rebuild it for him has sadly he ran out of time, I have a reproduction manual from 1968 with frame dimensions in it and some of the dimensions car vertical to a datum line. I...
18. ### Water level before and after metling of ice cube

Homework Statement A big ice cube is placed in a small glass of water. The level of water in the glass is marked. When the ice cube melts completely,the overall water level will remain the same. Explain. Homework Equations Upthrust= weight of fluid displaced The Attempt at a Solution Since...
19. ### What will happen to the water level of the swimming pool?

if the person sitting in the boat throws a pebble to the swimming pool. Pebble was initially contained inside the boat and of course it has higher density than water.
20. ### Water level change for melting ice cube

Homework Statement http://imgur.com/Sk6YkIf . You can take Va to be volume of cavity and Di to be density and Vo to be volume of cube and A to be surface area of container and h to be height of liquid column and Vi to be volume of immerser part of cube. Prove if water level will rise or will...
21. ### Water level involving Density, mass, volume, radius

Homework Statement A small solid sphere of mass M0, of radius R0, and of uniform density ρ0 is placed in a large bowl containing water. It floats and the level of the water in the dish is L. Given the information below, determine the possible effects on the water level L, (R-Rises, F-Falls...
22. ### Rate of Increase in Water Level Due to Falling Cone in Cylinder

Homework Statement A cylinder of radius ##{R}## is partially filled with water. There is an inverted cone of cone angle 90° and base radius ##{\frac{R}{2}}## which is falling in it with a constant speed ##v=30~cm/s##. Find the rate of increase of water level (in ##cm/s##) when half the...
23. ### Can I Connect Tank 1 & Tank 2 to Create a Water Level Difference?

I am currently working on something and I would like to know something. When we connect two tanks and we have water flowing into Tank 1. Is it possible to make a connection between Tank 1 and Tank 2 so the water level in Tank 2 is higher than water level in Tank 1?
24. ### Water level after melting of ice.

When an ice melts on water, which was initially floating on it, the water level must get increased. Why it remains unchanged??
25. ### Water Level: Effects of New Sphere on L

Homework Statement A small solid sphere of mass M0, of radius R0, and of uniform density ρ0 is placed in a large bowl containing water. It floats and the level of the water in the dish is L. Given the information below, determine the possible effects on the water level L, (R-Rises, F-Falls...
26. ### The possible effects on the water level

Homework Statement A small solid sphere of mass M0, of radius R0, and of uniform density ρ0 is placed in a large bowl containing water. It floats and the level of the water in the dish is L. Given the information below, determine the possible effects on the water level L, (R-Rises, F-Falls...
27. ### Please explain curious behavior with my rainwater barrel

I have a barrel that collects rainwater from the gutters on my house. At the bottom of the barrel is a manual 'faucet' with a round handle for turning the flow on and off. On that spigot, I have installed a "Y" fitting. One side of the "Y" goes to the irrigation hose which I turn on when the...
28. ### Effects of New Solid Sphere on Water Level

Homework Statement A small solid sphere of mass M0, of radius R0, and of uniform density ρ0 is placed in a large bowl containing water. It floats and the level of the water in the dish is L. Given the information below, determine the possible effects on the water level L, (R-Rises, F-Falls...
29. ### Trying to find a water level sensor/switch

Hello all. I am trying to find a sensor (probably switch is a better word) that will output a HIGH or LOW depending if the water (say, in a tank) has reached a certain level. I first googled: pressure sensor, then pressure switch. I also stumbled upon water level sensors, and now I am kind of...
30. ### Effects on water level when a sphere is replaced by a new solid sphere

A small solid sphere of mass M0, of radius R0, and of uniform density ρ0 is placed in a large bowl containing water. It floats and the level of the water in the dish is L. Given the information below, determine the possible effects on the water level L, (R-Rises, F-Falls, U-Unchanged), when that...
31. ### Outgassing of CO2 from a lake after lowering the water level

Hi folks! English is not my native language so please excuse my bad grammar. I am a geology student working on a project about a lake when an interesting puzzle piece - a newspaper article from 1844 - came up. This is not homework and I don't even know if a solution exists to my question at...
32. ### Why the significant water level drop?

hi guys OK, this has annoyed me for some time. I like my cups of noodles. The pack of noodles and sachet of flavour powder (obviously dry) go into the cup with hot water poured on them. Now if I fill the cup to the brim with the hot water, it will start to lower in level over a period of...
33. ### Is water level the same after an anchor is thrown from a boat?

Homework Statement (5) A person sitting in a boat floating on a small pond throws a heavy anchor overboard. Does the level of the pond rise, fall, or stay the same? Explain. Homework Equations FB=mass of fluid displaced times g Fnety=Fb-mg The Attempt at a Solution...
34. ### Determine the possible effects on the water level

A small solid sphere of mass M0, of radius R0, and of uniform density ρ0 is placed in a large bowl containing water. It floats and the level of the water in the dish is L. Given the information below, determine the possible effects on the water level L, (R-Rises, F-Falls, U-Unchanged), when that...
35. ### If an ice cube floating in a glass of water melts, won't the water level decrease?

Consider a floating ice cube in a glass of water. I know that the weight of the ice cube is equal to the weight of the water displaced. This would mean that if the ice cube melted, the volume of water melted would be less than the volume of the ice cube, because ice has a lower density than...
36. ### Differential equations to determine water level

Hi, the problem i have is this: How long will it take a water reservoir with an Average level of 300,000,000 m3 to drop to 90% of the average level, if there is a drought, taking into account average rainfall, evaporation and amount of water taken in and out? Assumption are: Reservoir is...
37. ### How can the water level in a trough be calculated using related rates?

Homework Statement 12.) A trough is 15ft long and 4ft across the top as shown in the figure. Its ends are isosceles triangles with height 3ft. Water runs into the trough at the rate of 2.5 ft3/min. How fast is the water level rising when it is 2 ft deep?Homework Equations The Attempt at a...
38. ### Height of water level in an open ended fully submerged can

Homework Statement An open ended can, with height 0.3m is filled with air (P = Patm ~ 100kPa) and is submerged (open end downward) 3 metres below the water surface (bottom of can 3m below while top of can is 2.7m below). The pressure above the water's surface is also Patm. The air is...
39. ### A 50-kg object was dropped from a height of 2 meters from water level

Homework Statement A 50-kg object was dropped from a height of 2 meters from water level of tank. The open water-tank has a hole 3 meters below water's surface. area of water tank is 1.5 sq m and diameter of hole is 2 sq mm. What is the max speed of water exiting the tank if the mini impact...
40. ### Calculating Water Level Rise in Low Pressure Zone | Atmospheric Pressure Effect

Homework Statement Suppose that a zone of low atmospheric pressure (a "low") is at some place on the surface of the sea. The pressure at the center of the "low" is 64 mm-Hg less than the pressure at a large distance from the center. By how much will this cause the water level to rise at the...
41. ### Confirm Water Level in Pipe & Tank? - Help Needed

Hi Can someone please confirm me on this one http://img822.imageshack.us/img822/9724/hydron.png 1. Is this picture correct? (The water level in the big tank and in the pipe will be the same) 2. Water level in big tank and pipe would be the same regardless of pipe size (red) Thanks
42. ### Water level indicator using seven segment display

Hello Everyone. I am making a little hobby project. The project is simply to represent the water level in a tank.The main idea is to construct the project using logic gates, decoders or encoders. My approach to the problem is taking the logic level (111111111) and converting it to bcd(8421)...
43. ### Water Level in Tank: Rising & Oscillating

hellO :D Homework Statement (Q)A large cylindrical tank has a hole of area A at its bottom.Water is poured in the tank by a tube of equal cross-sectional area "A" ejecting water at the speed "v". <a>Water level in the tank will keep on rising <b>No water can be stored in the tank <c>The...
44. ### Does Drinking Water From a Boat Affect Water Level?

a person is sitting in boat which is floating in water he drinks water by lowering himself from the boat will the water level rise and why i am not getting the question Homework Equations The Attempt at a Solution
45. ### What Effects Will the New Sphere Have on Water Level L?

Homework Statement A small solid sphere of mass M0, of radius R0, and of uniform density ρ0 is placed in a large bowl containing water. It floats and the level of the water in the dish is L. Given the information below, determine the possible effects on the water level L, (R-Rises, F-Falls...
46. ### Why does the water level in a glass flask first decrease and then increase?

itxx change lykk why water in glass flask first decrease then increase?replyy
47. ### Fluid Mechanics - keeping water level constant

Hello all,I am trying to construct this setup here: Don't mind the heat tape and microcontroller. I am concerned with the fluid dynamics of the system. When compressed air is applied, the water level in the evaporation chamber increase until it overflows into the tube that is exposed to...
48. ### Does the water level rise when a boat sinks?

Homework Statement An aluminum boat is floating in a swimming pool. A hole opens up in the bottom of the boat, and it sinks to the bottom of the pool. Does the water level rise, fall, or stay the same?Homework Equations (Is the buoyancy equation applicable here?)The Attempt at a Solution...
49. ### How much water does the cube displace?

A cube with edge 10 ft is submerged in a rectangular tank containing water. If the tank is 40 ft by 50 ft, how much does the level of water in the tank rise? We have figured the volume of the cube to be 1000 cubic feet - that is as far as we have gotten - help please!
50. ### Calculating Water Level Difference in English Channel

Homework Statement Estimate how much higher the water level is on the French coast than on the English coast when there is an eastward flow through the English Channel at a typical speed of 1m/s. You may assume that the English Channel is approximately 30km wide. Homework Equations An...