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C Chiu
CUHK gives two readings for this character:
zin1: 濺濺 即「淺淺」的意思
zin3: 飛濺, 水花四濺

After conducting some research in a public library, I find out that almost all Canto dictionaries have listed both ‘zin3’ and ‘zin1’ for 濺.
The principal reading is, of course, ‘zin3’ which means “to splash, spatter, spill” as recorded in CantoDict.
The secondary reading is ‘zin1’ which can be used only in the term 濺濺, meaning the “gurgle, murmur, babble” sound of flowing water.
One dictionary says that 濺濺 is an archaic term which has now been replaced by 淺淺. Two dictionaries say that 濺濺 can be used only in literary context. Still two others use verses in Tang poems as example sentences.
Perhaps we could reinstate the reading ‘zin1’ in CantoDict although 濺濺 is rarely used in the present day.

I've also been corrected by someone who says it's cin2 for the second meaning.

Cannot find an alternative reading of ‘cin2’ in any Canto dictionary.
However, literary sounds of non-aspirated initials b/d/g/gw/z can often be matched with colloquial sounds of aspirated initials p/t/k/kw/c. In our case, ‘zin’ sound could be matched with ‘cin’. Here are two examples:
zin2 = cin2 闡述, 闡明
zin6 踐行 | cin5 實踐
Unfortunately, ‘cin2’ is not the corresponding sound for ‘zin3’ in the case of 濺. Maybe in much earlier time, ‘zin3’ and ‘cin2’ were an literary/colloquial pair but I am not sure.

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ycchan

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Eldon
Can I further enquire as to why 淡季, 平淡, 淡水魚, 淡菜 and 淡月, for example, are listed with daam6? Surely these don't count as literary expressions?

淡 in 淡水魚 is definitely taam5. I have never heard "daam seoi" before.