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Water: WARSSS

Featured Items

A three-phase assessment methodology with dozens of steps and more figures, forms and peripheral links can be hard to navigate when one is looking for a specific part of the whole procedure and may not know exactly where it was seen. For this reason we've created this Featured Items page to provide a fast way to find some of the features of WARSSS that, although buried within many-step procedures, are in demand all by themselves.

The featured items are listed below. If your desired link is not listed, use the ‘search’ function at the top of the page.

 
BEHI and NBS
Bank erosion hazard index (BEHI) and near-bank stress (NBS) are field monitoring methods for focusing in on the most significant bank sources of sediment and estimating bank erosion. This helps to quantify the sediment loading from bank sources, as well as locate key areas for implementing new restoration efforts and management controls.

Sediment rating curves
Sediment rating curves (SRCs) are a graphical method for displaying the relationship between measured sediment values, for suspended or bedload sediment, at different flow volumes. Calculations from an impaired stream can be compared with a reference condition SRC to assess departure from expected values, which is critical to quantifying excess sediment load that needs to be targeted in restoration.

Rosgen Stream Classification System
A classification system is used to stratify and describe the various river types. It does so by integrating individual variables including combinations of dimension, pattern, profile, and materials amidst a wide range of valley slopes, sediment size/load, and streamflow.

Channel evolution
Channel evolution (adjustment, succession) is a general term for changes in channel form influenced by instability. These changes are caused by sediment supply alterations, accelerated bank erosion rates, degradation, aggradation from channel disturbance, streamflow changes, and sediment budget changes. This link provides information on ways channel evolution theory helps one predict the type of change a destabilized channel may undergo and its probable future form as a more stable but different stream type.

Stability assessment
The assessment method addresses key variables that influence the river's equilibrium state, where it maintains its dimension, pattern, and profile without aggrading nor degrading.

Reference reach
A reference reach is a segment of river or stream to which the assessed river or stream is compared to determine the direction and magnitude of departure from a reference condition. Attributes for defining the reference reach are the same channel metrics used in classification of stream type, thus consulting the stream classification tutorial will provide much information needed for reference reach documentation. In the case of unstable stream types, the analyst will also need to consult the channel evolution scenarios to predict what stream type should best serve as a reference reach for the channel still undergoing adjustment.

Case studies
The field research and study of Wolf Creek (Colorado) demonstrates the process concepts procedural methods used in WARSSS. As additional case studies become available, they will be shared via this page.
 


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