subject invention is affixed fig1 depicts the preferred method of use of the eccentric venturi flow measuring device 10 specifically flow measuring device 10 is preferably installed in a desired location in the interior of pipe 1 with a pair of bolts 3 that are inserted through appropriately spaced bores 12 formed in the pipe 1 and into threaded bores 14 formed in metering apparatus 2 a through bore 16 is formed in metering apparatus 2 at the apex of the eccentric curvature of the apparatus when metering apparatus 2 is installed in the interior of pipe 1 with bolts 3 through bore 16 aligns with a bore 18 formed through pipe 1 and a quick connect port 4 is fitted into the aligned bores i e through bore 16 in metering apparatus 2 and bore 18 in pipe 1 an identical quick connect port 4 is fitted into a bore 20 adjacent to and immediately upstream of metering apparatus 2 u2014 as used herein the term u201c upstream u201d refers to the direction of fluid flow through pipe 1 as illustrated with arrow b in fig2 a each of the quick connect ports is attached to pressure monitoring equipment not shown of conventional design so that the fluid pressure in pipe 1 may be measured at each port 4 fig2 a is a side view of the cut away isometric view of the eccentric venturi flow measuring device 10 depicted in fig1 the eccentric venturi flow measuring device 10 according to the present invention may be retrofitted for an existing well field or be original equipment for a new well field arrow a in fig2 a refers to the slope of pipe 1 relative to the ground plane which in fig2 a is horizontal as will be.