How to Restore Deleted sitecollection in sharepoint 2010

Hi all  unfortunatly i have deleted  site collections in sharepoint 2010 . I am able to restored it using powerscript.


if ((Get-PSSnapin "Microsoft.SharePoint.PowerShell" -ErrorAction SilentlyContinue) -eq $null)


{
Add-PSSnapin "Microsoft.SharePoint.PowerShell"
}
foreach($m in Get-SPDeletedSite)
{
Restore-SPDeletedSite -Identity $m
}