How do you calculate groundwater depth?
The most reliable method of obtaining the depth to the water table at any given time is to measure the water level in a shallow well with a tape. If no wells are available, surface geophysical methods can sometimes be used, depending on surface accessibility for placing electric or acoustic probes.
What is the depth of groundwater?
According to some estimates, the quantity of groundwater in the earth would cover the entire surface of the globe to a depth of 120 metres. By contrast, the volume of surface water in lakes, rivers, reservoirs and swamps could be contained in a depth of about one quarter of a metre.
How do you calculate groundwater elevation?
To establish groundwater surface elevations, the measured distance from the top of casing to the water surface is subtracted from the well top of casing (TOC) elevation.
How is well depth measured?
Definition of well depth: the distance from the ground surface to the bottom of the bore hole. Multiply the static head height by well diameter or by well volume per foot to determine the actual water volume comprised by the static head.
What is water depth?
Depth to water ranges from 0 ft below the surface along major rivers and streams to a maximum estimated at more than 1,200 ft below land surface on the southern slopes of Larch Mountain (pl. 1).
Is there an app to find underground water?
30by30 is a fun, free water-tracking app for Android and Apple devices from The Groundwater Foundation. Track your direct water usage, learn how to use less water, and see your monthly water usage. 30by30 makes tracking your daily water usage simple; the app calculates how much water you use, simply choose an activity!
How do you measure depth?
Commonly abbreviated as D, depth is a measurement of how far back a three-dimensional object is. For example, measurements of an object, such as a computer monitor, are commonly measured as (D x W x H), short for Depth by Width by Height. In the illustration, the Z-axis is the depth.
Which is the correct equation for groundwater flow?
Darcy’s equation, which has been used widely by hydrogeologists ever since, looks like this: V = K * i (where V is the velocity of the groundwater flow, K is the hydraulic conductivity, and i is the hydraulic gradient). We can apply this equation to the scenario in Figure 14.5.
What is the Darcy equation for groundwater flow?
Darcy’s equation, which has been used widely by hydrogeologists ever since, looks like this: (where V is the velocity of the groundwater flow, K is the hydraulic conductivity, and i is the hydraulic gradient).
How can I find the depth to the water table in a specific location?
A convenient way to find data for your area is by using the NWIS Mapper and selecting “Groundwater Sites” in the menu on the left. Click on any red groundwater pin to access the data.
How to calculate water level above or below sea level?
Today’s exercise: 1) Measure water levels in the three shallow wells and three deep wells. These water levels must then be converted to elevations above or below sea level (note: the common abbreviation for sea level is MSL or “Mean Sea Level”). Use the following formula to calculate the elevation of the water table above or below sea level: