sum of depth measurements average = depth number of measurements 1. 2. sum width measurements sum of width measurements average = width number of measurements width depth Area = X CALCULATE SPEED-measure the time it takes a float to travel a desired distance It is advisable to take at least 2 measurements of current speed take measurements from the stream run length in feet 20 feet is recommended 1. 2. 3. 4. sum time in seconds sum of time measurements average time = number of measurements length in feet Speed = average time in seconds CALCULATE STREAM FLOW Flow = Area X Speed X Coefficient cfs .9 coefficient for muddy bottom stream Flow in cubic feet per second .8 coefficient for rocky bottom stream Measuring Channel Cross-Section Objective: Students will document changes in stream-channel shape, or stream profile, by measuring the stream channel section. Location: Outdoors at local stream Time Needed: 60-90 minutes Subjects: Science, Math Alignment to NC Essential Standards for Science: 8.E.1 Een.2.3.
average depth = sum of depth measurements number of measurements width measurements 1. 2. sum average width = sum of width measurements number of measurements Area = width X depth CALCULATE SPEED-measure the time it takes a float to travel a desired distance It is advisable to take at least 2 measurements of current speed take measurements from the stream run length in feet 20 feet is recommended time in seconds 1. 2. 3. 4. sum average time = sum of time measurements number of measurements Speed = length in feet average time in seconds CALCULATE STREAM FLOW Flow cfs = Area X Speed X Coefficient Flow in cubic feet per second .9 coefficient for muddy bottom stream .8 coefficient for rocky bottom stream Measuring Channel Cross-Section Objective: Students will document changes in stream-channel shape, or stream profile, by measuring the stream channel Location: Outdoors at local stream Time Needed: 60-90 minutes Subjects: Science, Math Alignment to NC Essential Standards for Science: 8.E.1 Een.2.3. section.
Flow-and-cross-section-lessons.docx