WSP12125

• File Number: 8102
• Description: Arkansas River Hydrology
• State: CO
• Basin: Arkansas
• Water Division: 2
• Date: 1/1/1997
• Author: USGS
• Title: Description of the Program Changes - 1989-97- and a User Manual for a Transit-Loss Accounting Program Applied to Fountain Creek Between Colorado Springs and the Arkansas River-Colorado
• Water Supply Pro - Doc Type: Report/Study

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two TRF entities, three TRF diversion categories,
NSF, and NSF diversions. To provide a descriptive
printed output incorporating all the program changes,
the program output was changed substantially,
resulting in a four-page output (table 5). The first page
of the revised output consists of:
1. A listing of all the TRF's (CCS and FAP)
discharged into Fountain Creek at the CCS,
Security, Widefield, and Fountain WWTF's; the
TRF for Clover Ditch; and the native return 110w
at the CCS WWfF. [The TRF's from the Secu-
rity, Widefield, and Fountain WWfF's currently
(1997) are not used in the accounting program.]

2. The provisional daily mean discharge at the six
gaging stations on Fountain Creek used in the
accounting program, including the 24-hour
period used in computing the discharge.

3. A listing of TRF diversion accounts for each of the
diversions along Fountain Creek. This listing is
an added output feature requested by the agen-
cies that use the accounting program. To facili-
tate diversion of any of the three TRF categories,
each ditch owner can purchase a given quantity
of these TRF's at any time; this is the PURCHSD
value in the output. Then, whenever the ditch
owner wants to divert some TRF for irrigation, a
request is made to the water commissioners, the
diversion amount is input to the program for the
appropriate days, and the accounting program
computes the TRF purchase quantity needed at
the CCS WWTF. For each day of TRF diversion,
the TRF purchase quantity is added to the USED
value in the output. The first set of values (FRY-
ARK RETURN FLOWS) is for diversions of
FAP TRF's; the second set of values (FRY-ARK
1ST USE EXCH) is for diversions of CCS TRF's
that are exchanged for FAP water stored in
Pueblo Reservoir; and the third set of values (CS
REUSE WATER) is for diversions ofCCS TRF's
that are not exchanged. The diversion account
quantities are in acre-feet, whereas most of the
other output quantities are in cubic feet per
second (CFS, table 5).

The second page of the revised output (table 5)
lists for each ditch (1) the NSF diversion, (2) the TRF
diversion for each TRF category, and (3) the TRF
release for each TRF category. The TRF release quan-
tity (RLEASE, table 5) is computed by the accounting
program and is the same as the TRF purchase quantity

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"t.,.

..~.:

described in the "Changes to Account for Diversion of
Transmountain Rerum Flows" section (p. 15-16). The
release quantity is converted to acre-feet and is
summed into the USED account value on the first page
of the revised output.
The third page of the revised output (table 5)
first lists the FAP TRF and the CCS TRF subreach
discharge quantities (top one-half of the page) and
then lists the NSF subreach discharge quantities
(bottom one-half of the page). For each of the three
streamflow entities, the incoming discharge
(INFLOW; NATIVE INFLOW), the diversion
(DIVRSN; NATIVE DIVRSN), the transit gain or loss
(ON/LS; NATIVE ONILS), and the outgoing
discharge (OUTFLOW; NATIVE OUTFLOW) are
listed. The total inl10w and outl1ow in each subreach
are listed in the last two columns of the bottom one-
half of the third output page.
On the third page of the revised output, the total
inl10w discharge for each subreach is the same as the
total outl1ow discharge of the previous subreach,
which also is true for the NSF inl10w and outl1ow
discharge quantities. The NSF inl10w and the NSF
outl1ow discharges were not the same for all
subreache.s in previous versions of the accounting
program (tables 2 and 3) because of the required initial
assumption that TRF at the downstream gaging station
of a stream-segment is the same as at the upstream
gaging station (see the "Assumptions Used in the
Computations" section, p. 8). To correct this defi-
ciency in the previous program versions, a repetitive
capability was added to the computations of the
current (1997) version of the program.
The repetitive capability consists of the
following: (I) When computations are completed for
all subreaches within a stream segment, the
accounting program compares (a) the computed TRF
at the end of the downstream subreach within the
stream segment to (b) the initial TRF at the down-
stream gaging station of the stream segment, which
was assumed to be equal to the TRF at the upstream
gaging station (see the "Assumptions Used in the
Computations" section, p. 8). (2) If there is more than
a I-percent difference between the two TRF quantities
(a and b), the program repeats the stream-segment and
the subreach computations for that stream segment;
however, in the repcated stream-segment computa-
tions, the computed TRF (quantity a) is used to esti-
mate NSF at the downstream gaging station (fig. 4,
bottom box in COMPUTE UNKNOWN QUANTITY

22 Ooscrtpllon. ollhe Progrom Chango. (198H7) and a U.er Manual lor a Translt-Lo.. Accounttng Program
Apptted to Fountatn Creek Between Colorado SprIng. and tho Arkan.a. River, Colorado