I did receive an answer from Irene at Sterilite. Here 'tis with my reply as well.
Hi Irene,
No apologize necessary. We are happy for answers!
I think we had all come to the same general conclusion. It was that outside channel that was not very noticeable in the picture that put most people off, myself included.
So thank you again for your efforts to soothe our curiosity. It is much appreciated.
Best regards,
Gwen
From: Irene Vega <ivega@sterilite.com>
Sent: September 6, 2018 2:46 PM
To: 'Gwen'
Subject: RE: Sterilite.com E-Mail Inquiry 0676
Hi Gwen,
My apologies for the delay. We had to so some investigating as this is a very old item. We do not have a definite answer, however we have two theories.
1. It is tilted up to keep the food from falling into the colander before you are ready to slide it in, instead of going in accidentally.
2. The channels on the outside are designed to drain the water back into the colander.
I hope this helps!
Kind regards,
Irene Vega
Consumer Support
Sterilite - Welcome