Snagging

Abstract: Clearing and snagging is used as an economical technique for reducing the frequency and duration of high frequency flooding in environmentally sensitive locations. Riparian vegetation and the organic debris it produces influence stream morphology, water quality, and aquatic and terrestrial ecosystems. Complete clearing and snagging has detrimental effects on these stream characteristics. Modified clearing and snagging is less damaging to the environment. Major modifications involve: (1) Selective removal and disposal of trees and snags based on size, location, condition, and habitat value; (2) labor intensive construction techniques; (3) access controls; and, (4) work scheduling to avoid fish spawning or other environmentally sensitive periods. Guidelines for modified clearing and snagging are discussed, and analytical approaches to estimating effects of vegetation and snags on flow resistance are reviewed.

Abstract: Construction projects have become larger and more complex and yet still maintain a high drive for quality. As a result of this increase in size and complexity, the quantities of documentation and information required to control the overall project process have themselves become more complex. Underpinning the goal of construction quality is real time information flow to and from the construction site along with communications between all the parties involved. Project information integration and collaboration is the key to achievement of coherent quality management and this can be attained through electronically sharing of information during the construction process. The residential sector of the construction industry continually experiences significant numbers of “snags”. Many site issues including snagging need to be resolved quickly and efficiently to avoid dispute and more importantly cost overrun. However, the distinct professions and artisans within the industry rarely acknowledge the needs of others. Indeed the snagging information they produce is often so incompatible that the next stage in many processes is to reconstruct the information into a workable format. Analysis of a range of organisations' approaches to snagging shows that they have their own distinct snagging process. What is required is a coherent approach to the use and implementation of an IT based, industry wide, snagging format which would revolutionise and streamline the recording and approval process of construction snagging.