Ground-Water Atlas of Colorado Special Publication 53

• Description: Ground-Water Atlas of Colorado Special Publication 53
• State: CO
• Author: Topper, Ralf; Spray, Karen; Bellis, William; Hamilton, Judith; Barkmann, Peter
• Title: Ground-Water Atlas of Colorado Special Publication 53
• Water Supply Pro - Doc Type: Publication

4W 'W 1QV .W --W -W 'v wW MW •ca 14W Colorodo Geological Survey
n1fA F T GROUND -WATER ATLAS OF COLORADO SP 5
EXPLANATION
Water Well
Depths in Feet
0 -50
51 -100
101 -200
• 201 -300
• >300
01 37`
NEW MEXICO 105° Water well data from DWR
0 50 Miles
Figure 6.7 -10. Distribution of reported well depths in the Raton Basin from the Division of Water Resources
database.
600 -�
i
15 point moving average
500
Total wells plotted = 1,013
Z
> ' ♦ ♦,
y 400
J i • •i
d• •
{C j •• i•
7� 300
'O ♦ ♦ • N
0
d 200 • . . • ... « •. ♦
♦ ♦ •tom• � � � • ♦ ff • � ♦ • • ♦ • ♦
100 �'• • ♦ i •.S
t ♦
• • '�♦
0 100 200 300 400 500 600
Reported Well Depth (ft)
Figure 6.7 -12. Scatter plot of reported water levels versus well
depth with a moving average trendline.
3
Eighty -five percent of the water supply wells of record in the Raton
Basin have reported yields of less than 16 gallons per minute (gpm),
while nearly 10 percent have reported yields greater than 40 gpm
(Figure 6.7 -13). The yield data would suggest that most wells are used
for domestic purposes, with limited use of ground water for irrigation
purposes in the Raton Basin. The mean and median reported yield val-
ues are 24 and 6 gpm, respectively. The large difference between the
mean (24 gpm) and the median (6 gpm) well yields indicates there are a
few large- capacity wells that skew the mean. These wells probably pro-
duce water from coal mines or mined areas where the large open areas
contribute to the high yields. It should be noted that most residential,
18C
16C
140
120
N
a 100
3
m 80
0
t-
60
40
20
0
Median = 115
o;V h' o\ ^o ti' �h Tyo yti' ti`' tit' yo �ry� yc,� ;10 Aov ati� �yv
ti 5 goo' a':'
Reported Well Depth (ft)
Figure 6.7-11. Histogram of reported well depths for those wells repre-
senting the 90th pecentile of all wells of record in the basin.
luu
9C
80
70
T 60
V
50
3
d 40
LL
30
20
10
0
1�1 *� �°` -n '`- ,tv 'Q "y' "`' ,y0 " ,hey " g0 " " 'O
Reported Well Yield (gpm)
Figure 6.7 -13. Reported well yields and their relative frequency of
occurrence.
t'