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[MD Longhorn]

The field that I worked on that had a ground rule triple (and I worked there quite often for a few years) was relatively normal in all aspects but one. It was built next to a ravine in the left field corner. Instead of building a fence there that would have cut off that corner (fence would have been at about a 45 degree angle to the normal left field fence) it was left open. A solid hit down the third base line could roll to approximately the depth that a normal high school left fielder might play ... but if it rolled any further (right on the line or to the left of that) it would most likely hit the downslope, pick up speed and roll into the ravine.

The ground rule was that if the fielder could get to it, play on ... but if it hit that downslope and passed the fielder it was a 3 base award. An umpire could rule a fly ball into that corner a 4-base award at his discretion (if he felt it would have cleared where a normal LF fence would have been) - I never had to make that call.