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<blockquote data-quote="Piratecat" data-source="post: 858243" data-attributes="member: 2">Sollir, be less hinty and more explicit. Pretend I'm slow or something.&nbsp; <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f600.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":D" title="Big grin&nbsp; &nbsp; :D"&nbsp; data-smilie="8"data-shortname=":D" />Rybaer, picture an underground spring-fed reservoir of undertermined size. It's dammed up, so that a small amount of water drains out, just like any dam. It's filled quite slowly.Then the flood doors are opened. At the same time, very far downstream, a series of razor-coated portcullises is lowered.The water rushes out into a steeply downwards sloping, perfectly smooth 10' x 10' tunnel. It slopes downwards in a gentle arc, merging with another tunnel.For the poor PCs, though, they first learn that there's a wall of water when it smacks into them at (I think) 60-80 miles an hour, driving them downstream into a series of three razor-gates while drowning them! Then the poisonous eels start attacking...&nbsp; Man, kuo-toa are mean.&nbsp; I'll attach one of my infamous Excel maps for illustration.My questions:&nbsp;- how fast (roughly) might the water get going? I did some research on flash floods, and the 60-80 miles an hour was suggested, but I'd like a sanity check.- how long would the water flow for? This is important both for drowning purposes and escape strategies. I know that this is dependent on the size of the reservoir, but I just have no clue how long something like this would take to drain. I'd say the reservoir is somewhere in size between a large pond and a small lake.Any thoughts or ideas would be appreciated!</blockquote>

[QUOTE="Piratecat, post: 858243, member: 2"] Sollir, be less hinty and more explicit. Pretend I'm slow or something. :D Rybaer, picture an underground spring-fed reservoir of undertermined size. It's dammed up, so that a small amount of water drains out, just like any dam. It's filled quite slowly. Then the flood doors are opened. At the same time, very far downstream, a series of razor-coated portcullises is lowered. The water rushes out into a steeply downwards sloping, perfectly smooth 10' x 10' tunnel. It slopes downwards in a gentle arc, merging with another tunnel. For the poor PCs, though, they first learn that there's a wall of water when it smacks into them at (I think) 60-80 miles an hour, driving them downstream into a series of three razor-gates while drowning them! Then the poisonous eels start attacking... Man, kuo-toa are [i]mean.[/i] I'll attach one of my infamous Excel maps for illustration. My questions: - how fast (roughly) might the water get going? I did some research on flash floods, and the 60-80 miles an hour was suggested, but I'd like a sanity check. - how long would the water flow for? This is important both for drowning purposes and escape strategies. I know that this is dependent on the size of the reservoir, but I just have no clue how long something like this would take to drain. I'd say the reservoir is somewhere in size between a large pond and a small lake. Any thoughts or ideas would be appreciated! [/QUOTE]

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