# Calculating the Total Annual Precipitation

#### Introduction

The objective of this step is to calculate the total annual depth of precipitation from a given precipitation time series . We have used the 15 minutes interval historical precipitation data, recorded at the weather station - COOP:122309 during the period 01/01/2000 - 12/31/2000, for this exercise.

## Conceptual Outcomes

Students demonstrate their understanding of precipitation time series records and the total annual precipitation in a region.

## Practical Outcomes

- Students learn to identify the units of the downloaded precipitation data.

- Students learn to calculate the total annual precipitation for a region from the precipitation time series using MS Excel.

## Time Required

30 minutes

## Computing/Data Inputs

- Numerical Data: Precipitation time series derived from 15-minutes interval historic precipitation data at NCDC station COOP-122309 : Precipitation time series (Excel 2007 (.xlsx) 26kB Sep7 15)

## Computing/Data Outputs

- Numerical Value: Total annual precipitation in the watershed

## Hardware/Software Required

MS Excel

## Instructions

Precipitation data recorded in the NCDC dataset typically has the units: one-hundredth of an inch. Lets divide these values by 100 to get the precipitation time series in inches. Now, the

**total annual precipitation**in your watershed is simply the sum of these precipitation values recorded in the year 2000. Very straightforward, isn't it ?

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## Additional Activities and Variants

## Related Steps

http://serc.carleton.edu/hydromodules/steps/105848.html