A waterfall (cascade) chart is a special type of column chart. A typical waterfall chart shows how an initial value is increased and decreased by a series of intermediate values, leading to a final value.

Shown below is a simple waterfall chart developed using FusionCharts:

<chart caption='Sales By Product' subcaption='For the year 2006' xAxisName='Product' yAxisName='Sales' numberPrefix='$' showValues='1' connectorDashed='1'>
   <set label='Bi v2' value='420000' />
   <set label='Real v3.2' value='810000' />
   <set label='Business Division Sales' isSum='1' />
   <set label='Fusion Charts' value='910000' />
   <set label='IS v2' value='720000' />
   <set label='PS v3' value='550000' />
   <set label='Web Division Sales' isSum='1' cumulative='0'/>
</chart>

FusionCharts allows you to show columns indicating cumulative or non-cumulative sum at any point in the chart. That is, you can opt to show a sum column after any data point. To create a sum column, you need to add the following <set> element at the point where you intend to show the sum column:

<set isSum='1' label='Summation Column Label' ... />

For example, in the above chart image, "Business Division Sales" column is a cumulative sum column.

By default, FusionCharts shows a total column (indicating the sum of all the columns on chart) as the last column of the chart. If you do not wish to show the last column as sum, set <chart showSumAtEnd='0' ..>. Or, if you wish to change the label of last sum column, use <chart sumLabel='My custom label' ..>.