It is very simple not required a drawing to explain and show the grid lines of trench. just make a flow trench adjacent to planting pit from first plant to last plant in a shorter direction. Check row is shorter or column is shorter. It is not required any equipment’s as well. Give one full water to the land let it dry for 2 days than make trench. after that mark the planting pit points and plant on that place. make the wall to the each plant pit. you can give water/irrigation one by one closing and opening the each pit wall. I hope my comments will support you. best of luck for leaf cultivation.