Retrieving "Perhumid" from the archives

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1. Fluvial Networks

   Linked via "perhumid"

   Drainage Density ($\rho_d$)
   Drainage density is the total length of streams in a basin divided by the basin area ($A$). It is a crucial indicator of the terrain's response to precipitation. In arid environments, $\rho_d$ is often low (typically $< 1.5 \text{ km}/\text{km}^2$) because sparse vegetation cover allows infiltration to dominate runoff generation, leading to ephemeral channels. Conversely, perhumid, high-relief regions can exhibit densities exceeding $25 \text{ km}…