The AASHTO Model Drainage Manual also contains
guidance and references on: 
x Design methods for evaluating the accuracy of
hydraulic studies, including elements of a data
collection plan; 
x Guidance on estimating flood flow peaks and
volumes, including requirements for the design of
Interstate highways as per 23 CFR 650, Subpart
A, “Encroachments;” 
x Procedures or references for analysis of tidal
waterways, regulated streams, and urban
watersheds;
x Evaluation of stream stability; 
x Use of recommended design procedures and
software for sizing bridge waterways; 
x Location and design of bridges to resist damage
from scour and hydraulic loads created by stream
current, ice, and debris; 
x Calculation of magnitude of contraction scour,
local scour, and countermeasures thereto; 
x Design of relief bridges, road overtopping, guide
banks, and other river training works; and 
x Procedures for hydraulic design of bridge-size
culverts