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the outfall of [river/drain/sewer]
outfall 指河流或管道的出水末端，比 outlet 更常出现在工程或环保语境中。
The outfall of the sewer empties into the bay.
下水道的排水口流入海湾。
河口；排水口
先理解核心含义，再看它在真实句子里的用法。
河口；排水口
the outlet of a river or drain or other source of water
The outfall of the sewer empties into the bay.
下水道的排水口流入海湾。
河流、排水管、涵洞、下水道等的排放口；河口；出口。
The point or place of discharge of a river, drain, culvert, sewer, etc.; mouth; embouchure.
The factory's outfall releases treated water into the lake.
工厂的排水口将处理过的水排入湖中。
Several outfalls along the coast release rainwater into the sea.
海岸沿线的几个排水口将雨水排入海中。
The city built a new outfall to reduce the risk of flooding after heavy rain.
城市修建了一个新的排水口，以减少大雨后发生洪水的风险。
outfall 指河流或管道的出水末端，比 outlet 更常出现在工程或环保语境中。
The outfall of the sewer empties into the bay.
下水道的排水口流入海湾。
常用介词 at 表示“在排水口这个位置”；复数形式为 outfalls。
Water quality is tested at the outfall.
在排水口检测水质。
用 into 引出排水口所流入的水体；outfall 常用于管道排水场景。
The plant has an outfall into the river.
这家工厂有一个通向河流的排水口。
Not this
The sewage outfalls into the river.
Use this
The sewage discharges into the river.
outfall 是名词，意为“排水口、河口”，不能当动词用。中文“排出”可译为动词 discharge 或 flow out，但不可直接借用 outfall。
Not this
There is outfall near the beach.
Use this
There is an outfall near the beach.
outfall 是可数名词，单数形式前需要加不定冠词 an。中文没有冠词，容易遗漏，因此应补上 an。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
污水排放口
The sewage outfall empties into the sea.
污水排放口将污水排入海中。
雨水排放口
Heavy rain can overwhelm the storm outfall system.
暴雨可能会使雨水排放系统不堪重负。
排放管
The outfall pipe carries treated water away from the plant.
排放管将处理过的水从工厂输送走。
排水渠道
The outfall channel was blocked by debris.
排水渠道被杂物堵塞了。
河口
The river outfall is a popular spot for birdwatching.
河口是观鸟的热门地点。
出水口结构
Engineers inspected the outfall structure for cracks.
工程师检查了出水口结构是否有裂缝。
Use outfall naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想：水向外（out）落下（fall）之处，就是河口或排水口。记住“流出+落下”的画面即可。
语域：formal 常见场景：环保工程、水利工程、技术文档 该词多用于正式或技术性语境，比较常见于环保、水利等专业领域，日常口语中很少使用。
The listed '-fall' words all end in /fɔːl/ and share the spelling chunk 'fall', but 'outfall' has primary stress on the first syllable (/ˈaʊtfɔːl/), so they are not perfect rhymes. Be careful with 'fallout' (/ˈfɔːlaʊt/): it reverses the 'out' and 'fall' chunks and sounds different.
Dictionary facts from ECDICT, WIKTIONARY.