01649707

Monograph

http://www.trb.org/Main/Blurbs/176503.aspx

This report describes scientifically supported methods for defining the design hydrology for stream restoration and channel stability at stream crossings with a set of decision support tools for guiding users to an appropriate combination of design tools and depth of analysis for design hydrology in a given hydrologic and geomorphic setting. Several decision support/analysis tools were developed to improve and facilitate design hydrology analyses: (1) a decision tree to be used with web-based hydrologic analysis tools (erams.com) for generating design hydrology metrics under existing and future land use scenarios, (2) guidance on relating channel response potential to an appropriate level of design analysis, (3) guidance on selecting analog reaches, (4) guidance on performing rapid geomorphic assessments of channel instability in the field, and (5) a spreadsheet-based Capacity Supply Ratio Tool (CSR Tool) for computing analytical channel designs that account for the full spectrum of sediment transporting events. Specifically, the guidance and tools provide support in assessing the current conditions adjacent to a stream crossing and in the upstream watershed to determine design effort, performing the appropriate hydrological and geomorphic analysis using a set of analytical and analog tools, and designing the channel through the stream crossing for stability and sediment balance. The hydrologic metrics and tools developed in this project provide a general framework and stronger physical basis for design hydrology at stream crossings, including locations where watershed land use is changing.

Project 24-40

English

64p

2017

NCHRP Research Report

9780309446556

Digital/other

Figures; References; Tables

Channel stabilization; Decision support systems; Geomorphology; Hydrology; Stream restoration; Streams; Watersheds

Design; Highways; Hydraulics and Hydrology

TRIS, TRB, ATRI

Oct 27 2017 2:29PM