Since I don't have the actual text of 'the reservoir short story', it's hard to say exactly what it's about. However, it could be a story that uses the reservoir as a backdrop for a human drama. It might be about a group of friends who go to the reservoir for a picnic and end up having an argument that reveals deeper issues in their relationships. Or it could be a story about the history of the reservoir, how it was built, and the impact it had on the local community.
I don't know who wrote 'the reservoir short story' as there could be many stories with this name. It could be an unknown local writer or someone just starting out.
There are definite connections. Both films showcase Tarantino's nonlinear storytelling and have elements of crime, violence, and dark humor. Also, the characters in both often have complex and morally ambiguous motivations.