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:


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

Publish your project

The hidden guard / Manhole cover

The hidden guard
The hidden guard

Design instruction:
Warning mark ruler: when the heavy rain,the water reaches a certain degree,is beyond the buoyancy, concealed in the manhole cover of warning feet will float out ,which makes people quickly find manhole covers, Put the lid on crossing beside the water can play a warning role, also can measure the depth of the water.


Guangdong Industry Technical College

Guangdong Industry Technical College
Guangzhou, China