Each slope is registered and has a little plaque with an emergency hotline number on it, should you find the slope not performing its duties. Here on Lantau there is a slope that has been cemented to a height of at least 500metres. Call me crazy but the thought of that volume of concrete falling on me at great speed, frightens me more than a few trees and some dirt. To deal with runoff in the rainy season all of the slopes come fitted with drainage holes and these are a favourite place for snakes to hide out. They're also great for growing bamboo.