Good bones, heavy engineering
The survey paints a consistent picture: the Kumlai still holds reasonable habitat quality, but it has been intensively modified everywhere except its upper reach.
Quality holds up surprisingly well
Habitat-quality scores stay in a narrow band (23–33) along the whole reach, and are actually highest downstream at Jora Bridge. The river retains a diversity of natural features — flow types, substrates, bankside trees — despite the pressure around it.
The town reach is severely modified
The contrast is stark. Upstream Par Kumlai is only "obviously modified" (Class 3), but every urban station is Class 5 — severely modified, with modification scores an order of magnitude higher.
Reinforced banks & bridges
Breaking the modification score apart, the same culprits recur: reinforced banks and beds, bridges, embankments and re-sectioning. Site 3 carries an additional large culvert. These are the fingerprints of urban flood-management.
Bankside life clings to the edges
Riparian (bankside) vegetation quality collapses to near zero through the engineered middle reach, surviving meaningfully only at the two end stations — upstream Par Kumlai and downstream Jora Bridge.
Gradient eases continuously downstream
The channel’s gradient declines steadily downstream — from the steeper upper reach at Par Kumlai to the low-gradient town section — the expected longitudinal profile of a foothill river leaving the slope break. The width-to-depth ratio, by contrast, stays moderate through the reach and then jumps sharply at Jora Bridge (13.7), where the channel opens into a notably wide, shallow cross-section at the downstream crossing.
