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

GANS143? 1A TJAN & ASSOCIATES
1111,drogeological and Environmental Consultants
area in NE' /4 of the SW '/4 of Section 31, T2N, R66W. The well is located just east of the
Spear Canal Irrigation Ditch and is an alluvial well completed to a depth of 50 feet. The
period from 2002 to 2012 is enclosed in window and appears to display a fairly constant
groundwater level as compared to past years. The average groundwater is level is shown
form two periods from 1989 to 2003 and from 2004 until 2012. The average elevation for
each of these periods is shown by the horizontal line on Figure 5 and shows that the average
groundwater level is higher for the later period.
To rule out the possibility that these higher levels were due to higher than normal
precipitation and recharge, annual precipitation data were obtained from the Western
Regional Climate Center for the Brighton Station. These data clearly show that the higher
than average groundwater levels for these years is unrelated to precipitation.
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4874
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p 4873
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Figure 5
Water Level Elevations in Well
02N6631ACD
21
18 m
t
c
15 C
C
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6 0.
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3 Q
Y
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.-1 m .i rn e-i rn e-1 o o ~14 m m o
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Date
­-Water
Level
Elevations
Precipitati
on
The other well, SB02N6620CD is located about 1 mile to the northeast of the study area in
the SW '/4 of the SE' /4 of Section 20 T2NR66W. Based on topographic contours of the area,
the well appears to be situated on the edge of the South Platte Alluvial valley. Water level
elevations on Figure 6 show a similar pattern to the water levels in SB02N663 I ACD.
Average elevations from 1995 to 2004 and from 2005 to 2010 also show there is slightly
higher average elevation for the later period. Greater seasonal fluctuations also appear to be
noticeable primarily from recharge to the aquifer from irrigated and non- irrigated periods
from 2005 to 2010. Although this well is located further away from the river than well
SB02N6620CD, it appears to be affected by mounding on the east side. The impact from
mounding may be affecting water levels on the east side during certain periods of river flow.
It can be assumed that the river is primarily gaining except during flood stages when water