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Understanding Agricultural Drain Design and Flow Budget Analysis at BYU

This script outlines an in-class task for CE 547 at Brigham Young University, focused on agricultural drain modeling. Students will learn to open a project in GMS, manipulate cell settings, and analyze changes in hydraulic head due to a pond's characteristics as a sink or source for water flow. The task includes adjusting conductance and observing resulting water surface elevations, guiding students to understand flow budgets and the implications of pond discharge in agricultural drainage systems.

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Understanding Agricultural Drain Design and Flow Budget Analysis at BYU

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  1. Agricultural Drains, Part 3 In-Class Task Script CE En 547 Brigham Young University

  2. 1. Open project in GMS

  3. 1. Select cells and mark as GHB

  4. 2a. Save and run Note changes in head. Pond acts as a sink.

  5. 2b. Flow Budget Is the pond a source or a sink? How would spec head cells compare in this case?

  6. 3a. Change conductance Cell size = 50 ft x 50 ft C =KA/L = (0.01)(50*50)/1 C = 25

  7. 3b. Save and run Heads are higher. Why?

  8. 3c. Flow Budget Less discharge to pond. Why?

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