考点：动词的过去分词作被动态vs. adj.。
The phrase "there is no wasted rainwater" isn't necessary when the passive form "rainwater is not wasted" is shorter and even clearer to readers.

这里there is no wasted rainwater进行了限定，没有wasted rainwater，但是有没被浪费的rainwater??? 明显与almost perfectly不符合。如果改成there is no rainwater wasted，其实是对滴，当然有wordy的嫌疑，不是核心错误。

借鉴：https://gmatclub.com/forum/evidence-of-some-shifts-in-the-character-of-violence-on-television-is-296906.html。