Hydrogeology

Hydrogeology is the study of how Earth's hydrosphere interacts with its geosphere. It deals with the processes involved in groundwater, including its distribution and movement.

Event Overview
This event consists of three parts; a written test (25% of the total score in the event), the use of a model to answer questions (25% of the total score), and the use of a scenario to evaluate and assess the risk of the contamination of a well along with the application of knowledge to create possible solutions for the reduction of anthropogenic effects on groundwater (50% of the total score).

Although students are not allowed to bring reference materials, they may create notes during the competition, but these must be handed in before exiting the event.

Hydrologic Cycle
For more information on the hydrologic cycle, visit the Hydrologic Cycle page.

Aquifers
Aquifers are underground geological structures that can store and release water. Confined aquifers are aquifers that are confined between two impermeable layers (layers that do not allow water to pass through). Unconfined aquifers are aquifers which allow water to seep/flow freely through them. There are also aquitards, which can collect water but not release it; and aquicludes, which do not collect or release groundwater.

Darcy's Law
Darcy's law is a fundamental law in hydrogeology. It is an equation that relates the properties of an aquifer to the velocity that water flows through it. The law comes in many forms, but the most simple is $$V=ki$$, where V is the apparent velocity, k is the permeability of the aquifer (how well water can flow through it, and i is the hydraulic gradient of the aquifer. Permeability is a property of rocks and soils, of the speed at which water flows through it with no relation to gravity. The hydraulic gradient is basically the slope of the aquifer; the rate at which the aquifer moves downward (this accounts for gravity). However, this version of Darcy's law does not account for "turns" in the rock/soil of the aquifer. A more commonly seen version of Darcy's law is $$V=ki/n$$, where n is equal to the porosity of the rock, as a percentage; and V is equal to true velocity.

Similar Events

 * Awesome Aquifers
 * Earth's Fresh Water

Links
Trial event rules