B3 Meandering 10-60 Gravels, Cut-bank erosion; lateral Flat-to-undulating Meandering Usually The most common stream type in the middle river and silts pint-bar accretion; floodplain surface; lower valley reaches reaches of Victorian rivers. These floodplains overbank vertical and oxbows; backswamps also have anabranches. In these often grade floodplain abandoned-channel downstream into floodplain type C2 accretion; counterpoint Examples: middle , River Murray, , accretion; oblique lower and (see figures 3.6, 3.7 and 3.8) accretion C1 Laterally <10 Abundant silts Overbank vertical Flat floodplains with Single-thread Abundant fine Typical of the floodplains in the of stable, and clays with accretion low levees; straight / sediment load the state organics backswamps meandering reaches Examples: , mid (see Figure 3.9) and floodplain C2 <10 Gravel and Overbank vertical Flat floodplains with Anastomosing Very low gradient Found in downstream or middle reaches of river sands with accretion; island extensive levees, with wide floodplains rivers in north of and in Gippsland floodplain abundant silts deposition islands and Examples: Thomson (see Figure 3.10), and clays Latrobe, Macalister, King and Ovens rivers and splays. (see Figure 3.11). C2a <10 As for C2 with As for C2 with peat As for C2 with lakes Anastomosing As for C2 in humid Not found in river, abundant formation and lacustrine and peat swamps environments organic rich organics and sedimentation floodplains\ lacustrine deposits C2b <10 As for C2 but As for C2 As for C2 Anastomosing As for C2 in semi-arid Typical of floodplains in the north-west of river, with little or channels environments Examples: lower Loddon (see Figure 3.12), inorganic no organics Avoca and Wimmera rivers floodplain Note: this is based on Nanson and Croke (1992).
B3 Meandering river floodplain 10-60 Gravels, and silts Cut-bank erosion; lateral pint-bar accretion; overbank vertical and abandoned-channel accretion; counterpoint accretion; oblique accretion Flat-to-undulating floodplain surface; oxbows; backswamps Meandering Usually valley reaches The most common stream type in the middle reaches of Victorian rivers. These floodplains also have anabranches. In these often grade downstream into floodplain type C2 Examples: middle , River Murray, lower , lower and (see figures 3.6, 3.7 and 3.8) C1 Laterally stable, floodplain <10 Abundant silts and clays with organics Overbank vertical accretion Flat floodplains with low levees; backswamps Single-thread straight / meandering Abundant fine sediment load reaches Typical of the floodplains in the of the state Examples: , mid (see Figure 3.9) and C2 river floodplain <10 Gravel and sands with abundant silts and clays Overbank vertical accretion; island deposition Flat floodplains with extensive levees, islands and and splays. Anastomosing Very low gradient with wide floodplains Found in downstream or middle reaches of rivers in north of and in Gippsland Examples: Thomson (see Figure 3.10), Latrobe, Macalister, King and Ovens rivers (see Figure 3.11). C2a river, organic rich floodplains\ <10 As for C2 with abundant organics and lacustrine deposits As for C2 with peat formation and lacustrine sedimentation As for C2 with lakes and peat swamps Anastomosing As for C2 in humid environments Not found in C2b river, inorganic floodplain <10 As for C2 but with little or no organics As for C2 As for C2 Anastomosing channels As for C2 in semi-arid environments Typical of floodplains in the north-west of Examples: lower Loddon (see Figure 3.12), Avoca and Wimmera rivers Note: this is based on Nanson and Croke (1992).