CoCoRaHS Tutorial - How the rain gauge works

Introduction

This tutorial provides a step-by-step guide on how to use the CoCoRaHS rain gauge, an essential tool for measuring rainfall accurately. By participating in the CoCoRaHS program, you can contribute valuable data for scientific research and weather forecasting, all while engaging in a hands-on educational experience.

Step 1: Understanding the Rain Gauge Components

Familiarize yourself with the parts of the CoCoRaHS rain gauge to ensure proper use.

• Gauge Body: The main container where rainwater collects.
• Measuring Tube: This tube is marked with measurements to help you read rainfall.
• Overflow Cup: Prevents spillage if rainfall exceeds the measuring tube's capacity.
• Funnel: Directs rainwater into the measuring tube.

Step 2: Setting Up the Rain Gauge

Proper setup is crucial for accurate measurements.

1. Choose a Location:

   • Place the gauge in an open area away from trees, buildings, and other obstructions.
   • Ensure it's at least 5 feet off the ground for optimal airflow.

2. Secure the Gauge:

   • Use a stake or mount the gauge to keep it stable against wind and other weather conditions.

Step 3: Measuring Rainfall

Learn how to read and record your rainfall measurements.

1. Daily Measurement:

   • Check the gauge every day at the same time for consistency.
   • If there's any rain, carefully remove the measuring tube from the gauge body.

2. Reading the Measurement:

   • Look at the water level in the measuring tube.
   • Read the measurement to the nearest 1/100th of an inch. For example, if the water level is at the 1.25 mark, record it as 1.25 inches.

3. Overflow Situations:

   • If the rainfall exceeds 1 inch, use the overflow cup to measure additional rainfall.
   • For example, if the total rainfall is 1.75 inches:
     • Record 1.00 inch from the measuring tube.
     • Measure the overflow amount (in this case, 0.75 inches).
     • Combine both measurements for a total of 1.75 inches.

Step 4: Recording and Reporting Data

Contribute your rainfall data to the CoCoRaHS network.

1. Daily Reporting:

   • Log your measurements online at the CoCoRaHS website or designated platform.
   • Make sure to record the date and time of your measurement.

2. Participating in CoCoRaHS for Schools:

   • Engage students by encouraging them to take turns measuring and reporting the data.
   • Use this experience to teach them about weather patterns, measurement, and scientific data collection.

Conclusion

Using the CoCoRaHS rain gauge is a simple yet impactful way to connect with science and contribute to community weather data. By understanding how to set up, measure, and report rainfall, you can play a significant role in meteorological research. Start your journey today by setting up your rain gauge and becoming an active participant in the CoCoRaHS program!