This table shows the quantity of water passing over a rectangular weir in cubic feet per minute (cfm) for each inch of notch width. Depth D is read as a combination of the lefthand column and the top row. For example, if the depth over your stake is 5 3/8 follow over 5 (fifth row) to 3/8 (fourth coumn), and read the value as 5.01 cfm. Don't forget that this figure should now be multiplied by the width in inches of your notch.
TABLE: JAMES LEFFEL CO.