可能好多山友都會好像垃圾機械人一樣，喜愛炎炎夏日去行澗，感覺比較涼爽舒服。但夏天適逢雨季，經常會刮颱風及遇上大雨，除了避免惡劣天氣去行山、行澗，就算是暴雨過後天氣轉晴，都要特別留意。
行澗需要的準備，比一般行山還要多，除了要留意當日天氣，更要注意一個星期前有沒有落過暴雨。如果有的話，就算是好天氣都會有機會遇上特大水流，相當危險。加上山谷的位置險要，萬一發生意外，拯救人員都較難到達。
其實夏天想涼爽行山，新手可選擇相對安全的水塘路線，就算你有一定的行山經驗，計劃途經瀑布及山澗的路線時，都要特別留意一個星期前的天氣。大雨過後就不要接近或馬上行澗，最好預留多幾日緩衝。自己的安全，當然由自己來守護！
Note from “Megaphone” – Stream Hiking in Summer
Many hikers, like Trashformer, are fans of stream hiking during the hot summer days because of the comfortable breeze. However, during the summer monsoon season, typhoons and heavy rains are not uncommon. We should avoid hiking during poor weather conditions. Even if the sky has cleared after rain, we should still be extra cautious.
There is more preparation needed for stream hiking than usual hiking. Besides paying attention to the weather of that day, one should also see if there was a rainstorm the week before. If so, hikers could very likely encounter strong water flowing down the stream, even with decent weather conditions, and it is dangerous due to possible landslides and floods. Also, the precipitous valley makes it much more difficult for rescuers to arrive should an accident occur.
In fact, for less experienced hikers who want to hike while feeling some breeze, reservoir trails are a safer alternative. Even experienced hikers should be cautious of the weather conditions from the previous week while planning any routes that pass by waterfalls and mountain streams. Avoid hiking near streams after heavy rains, instead, wait for a few days as a buffer. Be a safe hiker!