Monday, July 2, 2012

Week Two

We decided that we would start this week off by going out into the field  to do some research. We went to Duck Creek, which is a small stream close to St. Ambrose. Even though we got out there at roughly 9:15AM, the heat and humidity were quite high. I decided to wear waders so I wouldn't get wet. Into the water Susa and I went, while David and Jessica stayed on the side of the stream. We decided that for our first time out running field tests we would just try and see if the falling head setup would work. The first trial was successful and from that position we decided to move up the stream about two or three steps each time. At each position, we would run three trails in order to obtain an average of the data. We then decided to test a cross section of the stream. In doing so we would run three trails at a position and move half a meter horizontally across the stream. We continued to do this until we got to the opposite side. The last meter we hit mud when putting the column into the stream. Due to this the test didn't work and we couldn't calculate any K-values. The area of Duck Creek that was chosen seemed to work well and hopefully the data obtained will be able to guide us in the right direction. As for the waders, well they weren't so successful. There ended up being small cracks in the them and by the end of testing, I had standing water in the waders. Next time, I don't think I will be wearing them. For tomorrow we will be running more tests back in the lab setting, continuing our testing of the different sands that we have.


  1. Great! I'll post pictures of the outing soon.

  2. Just quickly looking through the K values we calculated for the data collected at Duck Creek, it appears that there was similar amounts of variation in the values for the cross section of the stream (barring the tests near the edge of the stream that didn't go at all) and for the locations down the edge of the stream exhibit much greater variation (barring the 1 test site where the water went 5 times faster than any other). The average K value along the edge of the stream was higher than the average going across the stream which indicates that there may be different compositions of sediment between the center of the stream and the edge, perhaps something we will look into in the future.

    1. Cool, if you plot the average at each location vs. the cross section location (25 cm, 75 cm, 125 cm etc.) does it look random, or does it have any trends?