of the garbage disposal create a slight vacuum that helps suck and thus facilitate entry of the waste it is particularly desirable that the slope of the convexly sloped region 33 continuously increases as the waste approaches the drain opening 45 this helps maintain and or increase the speed of the water flow and move the waste towards the drain floor 35 with sufficient force to stop the waste from getting hung up near the shoulder portion 41 also the shoulder portion 41 allows water flowing down the bottom wall 12 to be launched off the convexly sloped region 33 and carry waste toward the drain opening 45 referring next to fig4 and 5 the first end wall 17 includes an upper portion 18 and a lower portion 19 with a rectangular water inlet 20 the food preparation sink 10 has a first nozzle 51 for delivering water in a first flow path f 1 along the bottom wall 12 of the food preparation sink 10 the food preparation sink 10 also has a second nozzle 57 for delivering water in a second flow path f 2 along the bottom wall 12 of the food preparation sink 10 water delivery to the first nozzle 51 and the second nozzle 57 is controlled by a valve system 70 having a manifold 74 the manifold 74 is in fluid communication with a first port 76 a second port 78 and an inlet port.