日本語 Japanese Ask Questions Thread 8

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英語でも日本語でもOK
日本の方からのご協力も大歓迎です

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I don't know Japanese nor do I have any particular desire to learn. However, when researching some KLK speculah, I came across this renga composed shortly before the the Honnoji Incident.

ときは今 あめが下しる 五月かな
水上まさる 庭の夏山
花落つる 池の流を せきとめて

English Wikipedia translates the first line as "The time is now, the fifth month when the rain falls" but notes that it has a double meaning.

https://en.wikipedia.org/wiki/Honnoji_Incident#Reasons_for_the_coup

I found some really rough Engrish translations for the other lines but I'm not sure how correct they are. I'm looking for a proper translation of the last two lines with a special emphasis on identifying any other wordplay or double meanings.