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ASTM D 5541 Document Information:
Title
Standard Practice for Developing a Stage-Discharge Relation for Open Channel Flow
ASTM International
Publication Date:
Apr 15, 1994
Scope:
This practice covers the development of a curve relating stage
(elevation) to discharge. Standard
test methods have been documented for measuring discharge and for
measuring stage (see Practice D
3858, and Test Methods D 5129, D 5130, D 5243, D 5388, and D 5413).
This practice takes the
discharge and stage determined by each respective test method and
shows a relation between them
using a curved line. This curved line is called a stage-discharge
relation or rating curve.
The procedures described in this practice are used commonly by those
responsible for investigations
of stream-flow, for example, the U.S. Geological Survey, Army Corps of
Engineers, Bureau of
Reclamation, and U.S Agriculture Research Service. For the most part,
these procedures are adapted
from reports of the U.S. Geological Survey.
The procedures described in this practice apply only to simple freely
flowing open-channel flow.
Ratings for complex hydraulic conditions of extremely low slope
channels using multiple-stage
inputs, channels affected by man-induced regulation, or tidal
conditions are not described. These
types of ratings are described in detail in the documents listed in
Footnotes 2 and 3.
This practice uses the results of current-meter discharge measurements
or indirect discharge
measurements and the corresponding measured stage to define as much of
the stage-discharge relation
curve as possible. A theoretical curve is developed for the full range
of stage and discharge to
shape the curve.
The values stated in inch-pound units are to be regarded as the
standard. The values given in
parentheses are for information only.
This standard does not purport to address all of the safety concerns,
if any, associated with its
use. It is the responsibility of the user of this standard to
establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.
Keywords:
- discharge
- rating curve
- stage
- stage-discharge relation
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