Castle Pines North WC Plan2007

• Project Type: Water Conservation Plan
• Applicant: Castle Pines North Metropolitan District
• Project Name: Water Conservation Plan
• Title: Castle Pines North Metropolitan District Water Conservation Plan
• Date: 8/1/2006
• County: Douglas
• Water Conservation - Doc Type: Complete Plan

CDM

Section 4
Proposed Facilities

Table 4-3 Present Value Costs

Year Annual Water
Production
(Assuming Projected Present value of supply
Demands) Present value of supply cost cost per gallon
1000 gal $ $/1000 gal
2006 613,002 $1,575,940 $2.57
2007 618,166 $1,606,997 $2.60
2008 633,934 $1 ,653,833 $2.61
2009 639,750 $1,689,770 $2.64
2010 645,560 $1,390,766 $2.15
2011 652,671 $1,434,319 $2.20
2012 652,671 $1,470,542 $2.25
2013 652,671 $1,508,248 $2.31
2014 652,671 $1,547,493 $2.37
2015 652,671 $1,588,329 $2.43
Average $1,546,624 $2.41

4.3 Preliminary Capacity and Cost Forecasts Supply

Capacity

The District's water supply corresponds to its demand. This is because the District
relies on a groundwater which is a direct function of its demands. When demands
increase, well production increases and vice versa when demands are not as high, the
well production decreases.

Assuming the District continues to use its groundwater system on an as needed basis,
the addition of surface water supplies will increase the overall supply capacity.
Acquired water rights may provide a suitable surface supply in average years and a
surplus in wet years. Surplus water may be used to recharge the groundwater basin.
Figure 4-3 illustrates this situation. Conversely, in dry years surface water may be able
to meet half of the District's needs. Under this case, the District would use its
groundwater wells to meet its remaining wells. This is concept is called conjunctive
use, where groundwater and surface water supplies are used conjunctively to help
sustain groundwater levels.

4-7

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