Unsupported browser

You are using an outdated browser. Please upgrade your browser to improve your experience.

Sign up for an Award

Participate with your entry in one of our professional or student awards.

Sign up for an award

Sign up for a Profile

Create your own profile and publish it in the iF WORLD DESIGN GUIDE.

Sign up for a profile

Learn more:

iF SOCIAL IMPACT PRIZE (free of charge)

Present your project for free and win your share of EUR 50,000 in prize money.

Publish your project

concave-convex / floor drain


Usually, common floor drain gets blocked up easily, as there is much rubbish in it. Even worse, the rubbish is difficult to clean up.

The concave-convex floor drain is designed to solve the problem. The concave surface of the water channel is made to stop the rubbish . When too much rubbish blocks in the concave surface ,which stops water from going through, water can still pass, via the holes in the convex surface. Furthermore,it is convenient for you to put the convex surface out and clean up the rubbish.


Shantou University

Shantou University
Shantou, China

Xiangyong Wu,Haoyu Li


Shantou University

Shantou University
Shantou, China

Cong Liu、Wei Huang、Sufang Tong