Rockville Water Forum Water Master Plan Report Water Master Plan - - PowerPoint PPT Presentation

August 20, 2015

Rockville Water Forum

Water Master Plan Report

Water Master Plan Overview

• User Analysis
• Historic Growth Rate
• Connections / Equivalent Residential Units (ERUs)
• Planning Period / Projected Growth
• Historic Water Usage
• 5 Point System Analysis
• Water Rights
• Water Source Capacity
• Water Storage Capacity
• Water Treatment
• Water Distribution

User Analysis

• Historic Growth
• Used 2010 Census Number as Population Basis
• Existing Connections / ERUs

Active Inactive Residential Residential Connections Connections 2011 135 17 152 2012 132 20 152 2013 132 20 152 2014 129 23 152 Other Connections Year Total ERU's

User Analysis

• Planning Period
• 20 – Years for Water Infrastructure
• 40 – Years for Water Rights
• Projected Growth
• Assumed to Follow Historic Growth at 1.5%
• Assumes no Major Developments
• 2034 Population = 342
• 2034 ERUs = 207
• 2054 Population = 461
• 2054 ERUs = 279

User Analysis

• Historic Water Usage
• Average Daily Usage = 250 gpd/connection
• Based on the Number of Active Connections
• Much Lower than State Guideline of 400 gpd/conn

5-Point Water System Analysis Water Rights

• Rockville Pipeline Company Water Rights
• Max Flow Rate = 67.3 gpm
• Total Annual Right = 113.4 Acre-Feet
• State of Utah Requirements (Average Day)
• Supply each ERU with 400 gpd Indoor + Outdoor Usage
• r

Use Historic Average Day Usage (250 gpd)

5-Point Water System Analysis Water Rights

• Existing Required Water Right
• Projected Required Water Right (40-Year)
• Projected Surplus of 35 Acre-Feet

5-Point Water System Analysis Water Source Capacity

• Existing Water Source Capacity
• Max Pump Capacity = 40 gpm
• Sustainable Capacity = 21 gpm
• Considers Pumping & Recharge Time
• State of Utah Requirements (Peak Day)
• Supply each ERU with 800 gpd Indoor + Outdoor Usage
• r

Use 2 x Historic Average Day Usage (500 gpd)

5-Point Water System Analysis Water Source Capacity

5-Point Water System Analysis Water Source Capacity

• Existing Required Source Capacity
• Projected Required Source Capacity (20-Year)
• Projected Deficit of 51 Acre-Feet

5-Point Water System Analysis Water Storage Capacity

• Existing Water Storage Capacity
• Total Storage Capacity = 400,000 gallons
• State of Utah Requirements (Average Day + Fire)
• Supply each ERU with 400 gpd Indoor + Outdoor Usage
• r

Use Historic Average Day Usage (250 gpd)

• Fire Demand = 1,000 gpm for 2 hrs = 120,000 gallons

5-Point Water System Analysis Water Storage Capacity

5-Point Water System Analysis Water Storage Capacity

• Existing Required Storage Capacity
• Projected Required Storage Capacity (20-Year)
• Projected Surplus of 228,292 gallons

5-Point Water System Analysis Water Treatment

• Rockville Pipeline Company - Treatment
• Continuous Disinfection
• State of Utah Requirements for Groundwater

Sources not under the Influence of Surface Water

• Continuous Disinfection (Recommended)
• Maximum Contaminant Levels (MCLs) – R309-200

5-Point Water System Analysis Water Treatment

5-Point Water System Analysis Water Treatment

• Radium 228 – Prior exceedance of 5 pCi/L MCL
• Back below MCL, but required to have a

plan in place in case of future exceedance.

5-Point Water System Analysis Water Distribution

• State of Utah Requirements
• 40 psi – Peak Day Demand
• 30 psi – Peak Instantaneous Demand
• 20 psi – Peak Day & Fire Demands
• See Peak Day with Fire Exhibit

Questions?