Sharp-edged hole
<img src="https://eng-calculations.com/SVG/Hydraulic_engineering/Valves/Sharp-edged hole.svg" alt="Sharp-edged_hole" title="Sharp-edged_hole">https://eng-calculations.com/SVG/Hydraulic_engineering/Valves/Sharp-edged hole.svg
<img src="https://eng-calculations.com/SVG/Hydraulic_engineering/Valves/Sharp-edged hole.svg" alt="Sharp-edged_hole" title="Sharp-edged_hole">https://eng-calculations.com/SVG/Hydraulic_engineering/Valves/Sharp-edged hole.svg