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The term 'invert' is commonly applied to the bottom section of a circular roadway support (segmental concrete or steel) and, I believe, it is applicable to the bottom of any shaped roadway whether carrying water or not. Barry Job. -----Original Message----- From: Eric BURKE [mailto:[log in to unmask]] Sent: 16 November 2004 20:01 To: [log in to unmask] Subject: Re: mining terms ----- Original Message ----- From: "Michael Shaw" <[log in to unmask]> To: <[log in to unmask]> Sent: Tuesday, November 16, 2004 3:07 PM Subject: mining terms Is 'Invert' a correct term in mining circles for the bottom of the water course level of a drainage adit? Mike Shaw Another term for a water channel in a drainage level is a "grip". The information in this email is confidential and is intended solely for the addressee. Access to this email by anyone else is unauthorised. If you are not the intended recipient, any disclosure, copying, distribution or any action taken or omitted to be taken in reliance on it, except for the purpose of delivery to the addressee, is prohibited and may be unlawful. Kindly notify the sender and delete the message and any attachment from your computer.