HomeMy WebLinkAbout2014-8-6 City Council Presentation MWF
Water Facilities Planning Study
August 6, 2014
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Water Facilities Planning Study
Key Elements
Existing facilities evaluation
Production
Storage
Pumping capacity
Distribution
Population & Demand projections
Capital Improvement Plan
City of Rexburg WFPS
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Population & Demand Projections
Population
2010 Census
25,484 people
Projected populations
Provided by the City
Max growth rate of 6.8%
Influenced by BYU-I growth
2023: 44,671 people
2033: 54,451 people
Demand
1Average Summer demand is Jul- Aug
2Average Winter demand is Nov-Mar
3Max day was in July 2012
4Peak hour was taken to be 1.64 X Max day based on a composite of
July 1 - July 4, 2012 hourly demands
5Population estimate interpolated from City projections
City of Rexburg WFPS
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Production Capability
8 wells supply water the City
1,400 gpm of new supply is needed for every additional 5,000 people
Firm capacity = maximum pumping capacity with the largest well off-line
City of Rexburg WFPS
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Storage Capacity
Components: Equalization, Fire Suppression, Standby, Operational, Dead
Evaluated separately for each of the three pressure zones: upper, middle and lower
Plan on 1 MG of storage for every 12,500 additional people
City of Rexburg WFPS
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Delivery Capacity
Capacity of wells, boosters, PRVs, and tanks to supply water to the system
Evaluated separately for each of the three pressure zones
Available Capacity is the Firm Capacity with the largest pump offline
City of Rexburg WFPS
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Distribution System
Evaluated for:
MDD + fire flow
PHD
Low Demand/High Pressures
Improvements to address fire flow failures, low pressures during PHD scenario, and high pressures during low demand scenarios
City of Rexburg WFPS
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Capital Improvement Plan
Priority 1.1 Improvements – High Priority Improvements completed within next 5 years
Priority 1.2 Improvements – Designed by City within next 5-10 years
Priority 1.3 Improvements – Funded by Developers
Priority 2 Improvements – Future Growth Expansion by 2040
City of Rexburg WFPS
Figure 8.1
Figure 8.2
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Rate Impacts
Priority 1.1 Improvements
$6.7 million in total estimated project costs
(construction, engineering, contingency)
DEQ offered a loan for $9.5 million
30 year loan at 1.75% interest
$770,894 of principal forgiveness
Annual Increase in System Costs - $706,500
Annual increase includes: IDEQ annual payment, equipment reserve, O&M costs for new equipment and increase in existing O&M replacement funds
User rate increase of $7.50 to $8.75 depending on funding scenario
Total Monthly Base User Rate of $23.45 to $24.60
City of Rexburg WFPS
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