bàoyǔ hòu jīshuǐ kàn bù qīng shēnqiǎn, yě kàn bù jiàn jǐnggài hé kēng

暴雨后积水看不清深浅，也看不见井盖和坑。

After heavy rain, you can't tell the depth of the water, and you can't see manhole covers or potholes.