MSMAware Computation |

This column, explain details on steps by steps of OSD computation using MSMAware software.

Step 1:- Start your MSMAware software.

Step 2:- Select On Site Detention tab.

Step 3:- Select ESM tab.

Step 4:- Select General tab.

Step 5:- Insert the value for ‘t_c’ and ‘t_cs’. Make sure the change time values in minutes unit.

Step 6:- Insert the value for time ‘start’ , ‘end’ and ‘step’.

Step 7:- Choose the suitable ARI required to design the OSD storage.

Step 8:- Insert the area for ‘impervious and pervious data for ‘pre’ and ‘post’ development.

Step 9:- Select the earth cover categories for ‘pervious’ and ‘impervious’ area. If the ‘C’ value is fix, choose true. It not, choose false.

Step 10:- Select the suitable type for OSD design.

Step 11:- Select ‘state’ and ‘station’ for your site project.

Step 12:- Select ‘outlet’ tab.

Step 13:- Insert the orifice parameter for ‘c_d’ and ‘h_o’ value in primary outlet.

Step 14:- Insert the value of ‘head over weir’, ‘free board’ and ‘C_bcw’ for secondary outlet -weir.

Step 15:- Click ‘Run’ button.

Step 16:- The result will be shown in ‘calculation’ tab. The orifice size and weir will be automatically calculated for you.

Step 17:- Click ‘ESM‘ to get full ESM, OSD MSMAware report.

Editor: Dilah – 6 Feb 14

MSMAware.com