Del Norte System Improvements Applic

• Project Type: Ag/Muni Grant
• Applicant: Town of Del Norte
• Project Name: First Phase Water Improvements Project
• Title: Grant Application
• Date: 11/27/1996
• County: Rio Grande
• Water Conservation - Doc Type: Application

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Table 3
Annual Water Usage

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Water Usage
Year Water Usage (MG) (Acre feet/year)
1991 241.42 740.9
1992 238.63 732.3
1993 286.59 879.3
1994 342.60 1,051.4
1995 292.59 897.9

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As shown in Table 3, peak annual water usage has been 1,051.4 acre feet. This usage consists of
approximately 40% of available water rights owned by the Town. Although available water
rights seem to provide adequate room for growth, it should be noted that total water rights are
from all sources. If one or more sources are not utilized, large usage from the other sources
could result in insufficient available water rights from those sources. For example, if well #2 is
run continuously throughout the year total withdrawals would exceed the water right for that
well. Although the assistance and advice of a qualified attorney would be required, obtaining an
alternate point of diversion from Well No.1 water right to Well No.2 water right would improve
water supply flexibility.

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In. WATER DISTRIBUTION SYSTEM STUDY

A. Analysis Procedures

The method used to determine the adequacy ofthe water distribution system was to analyze the
effect of different combinations of pipe sizes and water supply sources in the distribution system
until the calculations indicated acceptable water quantity and pressure were available to the entire
Town.

The procedure used was to distribute the water usage throughout the distribution system based on
the number of water taps in a certain area and then solve for the correct flow in each pipe to
satisfy these needs. After the flows were calculated, water pressure during these flow conditions
was determined for selected locations throughout Town.

In determining the water pressure, the elevation of each location was considered together with
the pressure losses caused by water flowing through the pipes. To simplify calculations, the
water usage from a localized area was combined into one withdrawal out of the water system.
This method of simplifying calculations is common practice and introduces insignificant error.

The actual calculations were done in accordance with a method know as Hardy-Cross Pipe
Network Analysis. The analysis method uses the Hazen-Williams equation for pipe flow. The
pipe friction coefficient used in the equation was 120. A digital computer was used to perform

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