administration student task rubric student work technical quality
NCTM Activity - Rainfall
Task with Student Directions

GLOBE Assessment
Grade 9-12

Math Activity for Protocol Test

The rain gauge has 3.2 cm of precipitation. The overflow tube has enough liquid in it to fill the 10 cm rain gauge twice and the third time an additional 1.5 cm is measured. What is the total amount of precipitation since the last measurement? (NCTM Standards: Numbers & Operations 3.1, 3.2)

Rainfall Protcol Test

The Rainfall protocol test assesses students' ability to collect accurate rainfall measurements, emptying and reassembling the rain tube, and what they do when rainfall exceeds the tube capacity

Download a Word or pdf copy.




Student activity & Level of Performance

+ appropriate student performance

- inappropriate student performance

n.a. not appropriate

Taking accurate rainfall measurements                                              
read scale at eye level                                              
read scale from bottom of meniscus                                              
record amount of daily rainfall (mm)                                              
record date and time of day (UT)                                              
record # of days rain has accumulated in tube                                              
Empty and reassemble the rainfall tube                                              
empty water into clean tube; save for pH                                              
invert tube; allow it to drain completely                                              
remove debris from empty tube                                              
rinse the tube with distilled water                                              
reassemble funnel, measuring-, overflow-tubes                                              
remount rain gauge; level top of gauge                                              
When rainfall exceeds tube capacity                                              
measure the level of rainfall in the tube                                              
empty the measuring tube                                              
measure rainfall from overflow tube                                              
add results to reach a final measurement                                              



©1997-2005 SRI International. All rights reserved. Terms of Use