2013-10-04_GENERAL DOCUMENTS - M1999120

• Permit No: M1999120
• IBM Index Class Name: GENERAL DOCUMENTS
• Doc Date: 10/4/2013
• Doc Name: Cause of Damage
• From: Ross Bachofer and Gancer Lujan & Assoc
• To: DRMS
• Email Name: ECS
• Media Type: D
• Archive: No

Hydrogeol(Tiral and F.nvironmenlal Consultants
may flow back to recharge bank storage in the adjacent areas. Higher stage levels in the
river may reduce flow from aquifer on the east side because of a lower hydraulic gradient
towards the river. Under this scenario, less discharge from the aquifer would mean higher
water levels in the aquifer on the east side of the river. This same phenomenon may be the
cause of higher average water levels in the well SB02N6631 ACD,
C
io
m
W
4874
4873 _
4872
4871
4870
4869
4868
4867 Average elevati
from 1995 to 20
4866
4865
Figure 6
Water Level Elevations in
Well SB02N6620CD
4864
v
c
0,
o,
g
g
c
w,w Water Level
10 0
Elevations
~
N
a
N
N Q
m
Date ; rn
Additional Considerations
0
O
w
25
20
v
c
15 J
c
w,w Water Level
10 0
Elevations
Precipitation !
IL
(Inches)
5
0
M
N
O
N
M
GL &A does agree with DRMS assessment of changing river conditions and the formation
of sand bars. Historic aerial photos from Google Earth from 2002 to 2012 are presented
below and show that the river morphology has changed. A noticeable increase in the
formation of sand bars has occurred in a reach of the river from approximately '/2 mile
upstream of the Bachofer property to the Fort Lupton gauging station % mile downstream.
While the earliest photos go back to 1993, only those photos with similar flow conditions in
the river were selected. Dates on the photos were matched with average daily discharge
data from the same date from the Colorado Division of Water Resources website for the
Henderson gauge on the South Platte River. Discharge values for these selected dates ranged
from 110 cfs to 215 cfs and depending on the year tend to represent low flow or average
base -flow in the river.
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