What are the two major parts of flow net? What are the guidelines for drawing a flow net? Solution The major part of the flow net are stream lines and Equipotential lines. Guidelines in drawing flow net are: Flow lines or stream lines and Equipotential lines are should orthogonal to each other at every point. Two flow lines and two equipotential lines never meet each other. The flow net should be formed should be square boxes of the field. Drop in head in the adjacent equipotential lines should be same..