4 primary land units, carrying 25.3 km of channel.Largest drains 68.2 ha
Runoff runs 96,600 to 289,801 m³ a year, depending on how the clay behaves.The soil type decides the band and the bands overlap widely. The farm is clay loam with 55 to 64 per cent clay; whether it behaves as an elastic cracking clay or an inelastic clay pan has not been established and changes the estimate by roughly half.
The outlet figure already in the project lands inside that band.The outlet figure of 180,000 cubic metres a year already in the project implies Y of 9.3 per cent, which falls inside the 8-in-10 band for every soil type in the table.
17.8% of the farm sits in the high erosion threat band, reading slope as percent.The handbook does not state whether slope is in percent or degrees. Percent is the commoner convention and is used for the map. In degrees the high-threat share falls from 17.8 to 2.9 per cent, so the reading is sensitive to an unstated assumption and is worth confirming with Regrarians.
≋Water flow paths25.3 km of channel, from 0.43 ha upslope
▦Land units4 primary units by drainage
⚠Erosion points8 places where high-threat ground meets a channel
◉Where it leavesThe low point of the farm
Land use is the primary cause of gully formation, not slope or rainfall. Grazing management is the lever here.
Regrarians 3.58 describes erosion progressing from sheet and rill to ephemeral gully to classic gully as runoff concentrates downslope. These points are where ground in the high-threat band feeds a defined channel.
