7910

• UCREFRP Catalog Number: 7910
• Author: Bovee, K. D. and R. T. Milhous.
• Title: Hydraulic Simulation In Instream Flow Studies
• USFW Year: 1978.
• USFW - Doc Type: Theory And Techniques, Instream Flow Information Paper No. 5.
• Copyright Material: NO

OF
black numerals to facilitate reading the proper "whole foot" on short
sights where only a small portion of the rod is visible through the
level.
A typical view through a level would appear as in Figure A-2. If
the instrument is properly leveled and the rod held plumb on the objects,
the elevation of the object is 5.495 feet below the elevation of the
instrument.
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,m.
.,,
7
® 5
s
-s
m' 5
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s
4
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a
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3
mss.
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Figure A-2. View through a level on a rod readin of 5.495 feet.
Many levels have short horizontal cross hair above and below the
center cross hair. These are called stadia hairs and are used in the
measurement of distances. A discussion on the use of stadia will be
given later in this appendix. Be especially careful not to read an
2lavation off a stadia hair instead of the central cross hair.