The Duckpond:A Sedimentary Budget Analysis, Drft 1, Dr. Cummins

This article submitted by Z. Humes, M. Mussman, A. Rush, D. Dawson, T. Nance on 9/22/97.

Introduction: Our goal with this discovery lab is to determine the amount of time at which the Western Duck Pond will fill with sediment if no excavation methods are employed.

Hypothesis: The time required for the Western Duck pond to fill with sediment is 23.1 years, assuming the following variables:

a. 3.8 liters of water enters the pond per hour

b. 65% sediment in water stays in pond

c. 500,000 liters of water in pond

d. 4% sediment deposited from external sources

Materials: collection chambers (film containers) 2 long poles measuring implement (measuring tape, string) swan defense fortress filters gram weight balance

Procedure: 1. Research the bathymetry of the Western Duck Pond utilizing public record information 2. Once bathymetry has been obtained, calculate volume of the pond in cubic liters 3. Attach 3 film containers around the large pole at 3 different levels, allowing several feet of space between each group of containers a. The first cluster of containers shall be 2 feet above the bottom while the other 2 clusters shall be spaced equally along the length 4. Repeat step 3 to create another pole5. locate 2 poles in the duck pond at random locations, sinking the bottom end of the pole on the floor of the pond 6. locate several collection containers at the base of the tributary stream 7. let the collection containers sit for one week 8. after a week's time
has elapsed, collect each container from the poles and the creek 9. in the laboratory, weigh a clean peice of filter paper 10. pour contents of each collection container through a peice of filter paper treating each container seperately 11. weight each container's sediment along with filter paper in grams (g) 12. subtract weight of clean filter paper from the result calculated in step #11 13. Repeat process #11 and #12 for all collection containers 14. replace containers on long poles 15. replace poles to different spots in the pond and replace the solitary containers to the base of the creek 16. allow one week's time to elapse 17. after one week, collect all containers 18. repeat processes #10 - #12, making sure to treat each container seperately

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