[oil drilling] In the petroleum industry, shutting-in is the implementation of a production cap lower than the available output of a specific site. This may be part of an attempt to constrict the oil supply or a necessary precaution when crews are evacuated ahead of a natural disaster. ... Found on http://en.wikipedia.org/wiki/Shut-in_(oil_drilling)
[river] A shut-in is an Ozark term for a river that`s naturally confined within a deep, narrow channel. The river becomes unnavigable even by canoe due to the rapids and narrow channels produced as the stream encounters a more resistant rock that is more difficult to erode. In the Johnson`s Shut-Ins State Park in Missouri hard rhyolite and ... Found on http://en.wikipedia.org/wiki/Shut-in_(river)