The result of computation using MSMAware and spreadsheet are compared and the result was shown in Figure 1 below.
Figure 1 Percentage error between MSMAware and Manual calculation
The result shows that overall percentage error is less than 1%. Each of routing consist of one peak error because of MSMAware modified outlet equation to make it more accurate.
It is concluded that MSMAware was accurate in the computation of detention basin for the study area following the requirements of MSMA 2000.