WSP12671

• File Number: 8146.600.30.A
• Description: Purgatoire River Study
• State: CO
• Basin: Arkansas
• Date: 1/24/2007
• Author: USDOI/SGS Lisa D Miller
• Title: Losses and Gains for Eight Unlined Canals Along the Purgatoire River Near Trindad, Colorado 2000 - 2004
• Water Supply Pro - Doc Type: Publication

Canal Losses and Gains 25
Table 7, Losses and gains for selected subreaches of EnlargHd Southside Canal, 2000-2004.
[ft'/s, cubic feet per second; SS, Southside Canal; HG, headgate; SSS, SOllthside Canal splitter; SW, Souths ide-Wagner Extension, SP, Southside-Palaski
Extension]
PRWCD Carini Subreach Sub reach Cumulative Loss or gain Loss or gain
Date canal name subruch inflow outflow diversions in subreach in subreach
(site to :.ite) (ft3/s) (ft3!s) (ft3/s) (ft3/sP (percent)1
August 9-11, 2000 Enlarged Southside
08/09/2000 Southside SSHG to SSSI 69.5 68.2 1.5 -0.2 -0.3
08/09/2000 Palaski Extension SSS 1 to SPlO 18.2 3.3 18.3 -3.4 -19
08/10/2000 Sandoval/Wagner Extension SSS I to SSS2 68.2 35.8 37.0 -4.6 -7
08/10/2000 Sandoval Extension SSS2 to SS07 35.8 2.4 29.9 3.5 10
08/1 0/2000 Southside SSS2 to SSS3 35.8 29.6 4.6 1.6 4
08/11/2000 South Wagner Extension SSS3 to SW05 9.2 4.5 3.5 1.2 13
08/11/2000 North Wagner Extension SSS3 to SWI2 12.9 5.2 8.5 -0.8 -6
May 22-23, 2001 Enlarged Southside
OS/22/0 I Southside SSHG to SSS 1 68.7 62.2 3.4 3.1 5
OS/22/01 Palaski Extension SSSI to SPlO 16.0 2.4 13.3 0.3 2
OS/23/01 Sandoval/Wagner Extension SSS 1 to SSS2 62.2 26.3 34.2 1.7 3
OS/23/01 Sandoval Extension SSS2 to SS08 26.3 1.1 22.3 2.9 11
OS/23/01 Southside SSS2 to SSS3 26.3 19.1 5.5 1.7 6
June 27, 2001 Enlarged Southside
06/27/01 Sandoval/Wagner Extension SSS 1 to SSS2 85.9 35.7 45.2 5.0 6
06/27/01 Southside SSS2 to SSS3 35.7 21.9 8.8 5.0 14
06/27/01 South Wagner Extension SSS3 to SW05 7.8 2.5 5.5 -0.2 -3
06/27/01 North Wagner Extension SSS3 to SW12 12.7 4.5 7.8 0.4 3
June 8-9, 2004 Enlarged Southside
06/08/04 Southside SSHG to SSSI 99.9 91.2 2.5 6.2 6
06/08/04 Palaski Extension SSS 1 to SPIO 21.1 4.5 17.2 -0.6 -3
06/08/04 Southside SSS 1 to SSS2 91.2 43.4 45.5 2.3 3
06/09/04 Sandoval Extension SSS2 to SS08 43.4 2.1 40.9 0.4 1
06/09/04 Southside SSS2 to SSS3 43.4 32.2 11.2 0.0 0
06/09/04 South Wagner Extension SSS3 to SW05 9.8 3.3 6.1 0.4 4
06/09/04 North Wagner Extension SSS3 to SW12 16.5 3.4 11.6 1.5 9
1 A positive value indicates a loss of flow from the canal and a negative value indicates a gain of flow to the canal.

flows about 17 miles from the headgate to Model Reservoir.
Model Outlet Canal (Model Canal downstream from ModeL
Reservoir) flows about 14 miles from below Model Reservoir
to the end of the canal (fig. 12).
Loss and gain measurements were made along Model
Canal on August 10,2000, August 23, 2000, May 24, 2001,
and June 12,2001, by the Colorado Division of Water
Resources. Additional loss and gain measurements were made
by the USGS on May 18 and 21, 2001, June 26, 2001, and
June 11, 2004. Information for individual measurements (made
by the USGS) is summarized in table A5 in the Appendix.
Losses and gains for selected subreaches of Model Canal are
'listed in table 8. Figure 12 shows the measurement site loca..
tions, and figure 13 shows losses and gains along Model Inlet
and Outlet canals in relation to distance downstream from the
headgate for measurements made by the USGS.
On May 18, 2001, discharge measurements were made
:at main channel and diversion locations from the headgate
(MOHG) to MOT3 along Model Inlet Canal (fig. 12 and
,table A5). The loss from MOHG to MOT3 was computed to
!be 1.9 ft3/s, or 3 percent of the headgate inflow (table 8 and
fig. 13).

Discharge measurements were made at main channel and
diversion locations from MOHG to MOT3 along Model Inlet
Canal on May 21, 2001 (fig, 12). The gain from MOHG to
MOT3 was computed to be 1.2 ft3/s, or 2 percent of the head-
gate inflow (table 8 and fig. 13).
Discharge measurements were made at main channel
and diversion locations from M2HG to M003 along Model
Outlet Canal on June 26, 2001 (fig. 12). Two diversion gates
were closed. Leakage of about 0.4 ft3/s was measured at one
of the gates, and no leakage was observed at the other gate.
A loss of 11.5 ft3/s, or 30 percent of the headgate inflow, was
determined between M2HG and M3HG, and a gain of 0.4 ft3/s
(2 percent of the subreach inflow) was determined between
M3HG and M003 (table 8 and fig. 13).
On June 11,2004, discharge measurements were made
at main channel and diversion locations along Model Inlet
and Outlet canals from MOHG to MOD3 (fig. 12). Minor
leakage was reported at three diversion gates (table A5). No
estimate of leakage was made. Loss from MOHG to MOEND
(upstream from Model Reservoir) was computed to be
2.3 fe/s, or 4 percent of the headgate inflow; whereas, a loss of
11.6 ft3/S, or 39 percent of the subreach inflow, was measured
from M2HG to M003 (table 8).