What defines a graphical flow net in hydrology?

A graphical flow net in hydrology is defined by the network of flow paths and equal pressure drops. This is particularly important in the study of groundwater flow and analysis of aquifers. A flow net consists of equipotential lines that represent locations of equal hydraulic potential, and flow lines that indicate the direction of groundwater flow. The intersection of these two sets of lines creates a graphical representation that helps engineers and hydrologists to visualize and analyze the movement of water through soil or porous media.

The significance of this representation lies in its ability to quantify groundwater flow, assess potential seepage, and understand aquifer behavior. It serves as a key tool for designing structures such as dams, levees, and other hydraulic engineering projects by providing insight into how water will move through the soil surrounding these structures.

The other options provided do not accurately define a flow net. For instance, contour lines for elevation relate to topographical mapping rather than fluid flow, potential energy values are relevant in different contexts within physics but do not directly correlate to flow nets, and soil consolidation properties are more concerned with deformation and settlement of soil under load rather than fluid dynamics. Thus, the characterization of flow nets as a network defining flow paths and pressure drops is the most accurate definition in hydrology.