FLOOD06423

• County: Statewide
• Community: State of Colorado
• Basin: Statewide
• Title: Preparation of Input Data for Automatic Computation of State-Discharge Relations at Culverts
• Date: 1/1/2000
• Prepared By: Matthai, Stull, Davidian
• Floodplain - Doc Type: Educational/Technical/Reference Information

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TECHNIQUES OF WATER-RESOURCES INVESTIGATIONS

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8

STAGE.OlSCHAIIGE IIEI.AtlON AT CULYEIITS

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Figure 2. --Data-input form 9-1695, stage-discharge relation at culverts.

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-crossed out -- not elsewhere. Clear, legible,
neat copy for the keypunch operator will re-
duce punching errors and turn-around time.

Card 2 - Stream Heading Card

Columns 1- 31. --Identify the site using the
letters or digits.

Columns 33-40. -- Enter gaging station num-
ber for all regular stations and crest- stage
gage stations. Dash and decimal may be
omitted if number has more than six numer-
als. Miscellaneous stations may be marked
with MISC, or any other identification sym-
hols, or theR€'- spaces can be left blank.

Columns 4.2-47. -- W I fixed decimal in col-
o
HUHl 4:), iH liw lowest water- surface eleva-
liOll to be lIsed in computing section proper-
ties of the approach section. Make W any
o
(.'onvenient elevation equal to or less than the
elevation of the upstream inysr! of the cul-
vert harrel, which is the HZ Elevlt on card 9.
W must also be chosen in relation to W
o max
and 6 W. See following instructions. If W
o
is lower than the minimum elevation at the
approach section, zeros will be printed until
\,' plus one or more values of b. W will give
o

positive section properties. In the flow com-
putation procedure, the message, "DISCHARGE
NOT IN THE RANGE OF CRITICAL DIS-
CHARGES:' is printed if any of the selected
discharges are less than the critical discharge
at W. The next higher discharge is then used.
o

Columns 49- 52. --A W, fixed decimal in column
50, is the interval, in feet, between water-
surface elevations for which ~pproach- section
properties are computed. Choose ~ W small
enough so that the upper limit of 24 intervals
is approximated; otherwise, the interpolation
between critical discharges will not be re-
liable. Compute AW as

f:!.W = (W - W l/24.
max 0

Then round upward until a whole number of
intervals exists between Wand W If
o max.
a fractional number of intervals exists, the
desired W will not be reached.
max

Columns 54-59. --W . fixed decimal in
max
column 57, is the highest water- surface ele-
vation to be computed for the approach sec-
tion. If W is less than 1. 5 D + z ele-
max
vation, the whole computation is aborted with
the trial for the first headwater elevation for