1. How fast does water travel trough soils?
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Permeability in soils
How fast does water travel trough soils? By
Eduardo Suescún
PhD Candidate, GK-12 Fellow
Civil Engineering Department
NYU-POLY

2. Permeability in Soils - Definition
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Permeability in Soils - Definition
Permeability is the measurement of the soil’s ability to allow water to flow through its pores or voids
Teacher will define soil permeability by using the above picture as help.

3. Importance of permeability
Applications in Civil Engineering
Design of earth Dams
The slope stability (mountains stability)
Retaining walls
Filters
Underground seepage and aquifers
The following applications illustrate the importance of permeability in geotechnical design.

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These pictures show the difference of building a dam on two different soils. The upper one indicates the decision is wrong because water is being lost through permeable layer, whereas the lower draw indicates there is not water losses because soil base has low permeability.

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Land slopes can be activated faster or slower depending on water flow, which at the same time depend on permeability of the soil 4

7. Permeability Tests Constant Head vs. Falling (drop) Head
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Permeability Tests Constant Head vs. Falling (drop) Head
The falling head test is used both for coarse-grained soils as well as fine-grained soils
The constant head test is used primarily for coarse-grained soils
In this slide the two most common permeability tests done in the lab are presented. Constant head, in the left half, is performed by keeping the column of water (delta H) constant, and the water coming out and time can be recorded. Falling head, in the other hand, is done by setting the water column in an initial and final heights Ho and Hi respectively. The time for the water drops down between the two heights are taken and the volume of water is known.
Source:

8. Mechatronics on Permeability
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Mechatronics on Permeability
A Ultrasonic Sensor is used to find out where objects are! Using this sensor it is possible to detect an object and measure how far it is.
This slide introduces the use of mechatronic tools in soil permeability application. A EV3 LEGO microcontroller and a ultrasonic sensor is depicted to emphasize that these components will be used later on the activity.

9. Advantages of mechatronics in permeability test
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Advantages of mechatronics in permeability test
This is simply the comparison between the traditional and innovated ways to measure soil permeability. The two pictures on the right side show a novel permeameter that has the EV3-LEGO and the ultrasonic sensor attached to it.
Permeameter with ultrasonic sensor and EV3 to measure water volume and time

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My expectations
The ability to define and understand permeability in soils.
The capacity to identify differences in size between gravel, sand, and clay
The ability to identify advantages and disadvantages of having a highly permeable soil
The ability to understand porosity in soils
The ability to understand the function of sensors, and mechatronics importance
Some preliminary aims listed in this slides can be described by the teacher right before the hand-on activity starts.

11. THANK YOU !