IDENTIFICATION OF TECHNIQUES TO MEET PH STANDARD DURING IN-STREAM CONSTRUCTION

摘要

Culverts constructed from a variety of materials and available in many different shapes and configurations are hydraulically short conduits necessary to convey stream flow through a roadway embankment or past some other type of flow obstruction. The service life of a culvert is subject to field conditions and the durability of the culvert material. Environmental conditions over time will deteriorate all culvert materials due to abrasion, corrosion, and removal of bedding materials (Norman et al., 2005). Therefore, proper attention must be given to this deterioration and periodic maintenance is required to increase the service life of a culvert. As water travels through the deteriorating culvert, water may also begin to travel outside of the culvert, eroding the soil bed and weakening the entire structure. The loss of soil and bedding beneath the road will eventually create voids, making the roadway unstable and the road pavement above may also fail.