Page 6 THE VILLADOM TIMES II • May 23, 2012 Glen Rock Glen Rock High School students in Heather McDermott’s Advanced Placement environmental study class recently learned the hands-on technique of stream quality assessment with the help of a watershed ambassador and a rubber duck. Watershed Ambassador Patricia Michelotti came to Glen Rock’s Thielke Arboretum last week, where students looked at Students learn stream quality assessment skills Diamond Brook. Three students stood in the stream to gather data used to calculate stream velocity – one of several factors in stream quality assessment. The students gathered velocity data by tossing a small yellow rubber duck upstream and calculating how long the duck took to float a specific distance. The experiment was (continued on page 10) Top right: Watershed Ambassador Patricia Michelotti explains how to conduct the velocity study. Bottom right: Glen Rock High School students watch as the rubber duck floats down Diamond Brook in the Thielke Arboretum. (Photos courtesy of Cindy Mehallow.)