Water, Water Where??

Water, Water Where??

WATER, WATER WHERE?? With apologies to SAMUEL TAYLOR COLERIDGE author The Rhyme of the Ancient Mariner December 5, 2006 Waterworks Board Corporation Controller Director, Contracts and Operations Advisory Counsel SAB Legal Support Fiscal Support

Operations oversight CAG TAG Contracts Budget Approve plans Opinions Fiscal monitor Approve programs Engage outside counsel Planning

Receive reports and operational deliverables Audit Evaluate incentives Water District activity coordination Note: Responsibilities list represents highlights of effort Objective Is there an industry standard or guidance for how much water supply is enough? There are many differing opinions on what is considered enough, ranging from: Supply supported by the overall yield under 10-year drought conditions to meet average daily demand projected for 20 years; to Enough water to withstand a 50-year drought and meet average demand projected for 50 years; to Enough water to withstand a 100-year drought and meet maximum day demand projected for 50 years; to

What is vaguely described in 10 States Standards. IW Growth Policy Offer water (retail, wholesale, agreement) within IURC-approved rate structure Offer services to by-passed areas Coordinate with communities affected by providing or extending water services Provide for water supply consistent with projected needs of central Indiana Reference: Adapted from the Indianapolis Department of Waterworks Growth Policy, 030602 Definition: Water Supply Volumetric supply availability shouldnt be confused with supply capacity. Capacity is usually targeted at maximum day demand plus ten percent reserve. (SD) Varies widely, dependent on a number of factors (EM):

By community; Climate; How diverse the local supply mix is (i.e. vulnerability to shortage); How much "reliability" is affordable; What the economic effects of shortages would be; Risk tolerance; Development community angst/pressure; Etc. (EM) Planning Challenges 2002 Insufficient Rated Treatment Capacity to Meet Peak Demand Conditions Lack of Sufficient Potable Water Storage Projected Deficit

Lack of Dependable Supply & Treatment Capacity to Meet Long-Term Demand Projected Deficit METRICS ADOPTED by IW BOARD MAR 06 Achieve peak day demand 99% of time Have storage capacity at 50% of daily average volume System pressure minimum 20 PSI with 30 PSI goal Groundwater Availability Generalized Aquifer Production Capacity Source: IDNR Water Production Facilities TERRY AIRPORT

Indianapolis Water Service Area Planning Horizon Generally, no clear preference for a specific planning horizon; 50 to 100 years is a reasonable timeframe. As for safe yield, the most common criteria is the 100-year drought, but some agencies may require a drought of record. State agencies often dictate what is appropriate to use for safe yield analysis and planning horizons, as they have often developed a water management program that defines "critical use areas" or similar designations that warrant source evaluations and demand management, together with consideration of environmental requirements such as minimum

in-stream flows. Consumption Trends More Than one Potential Additional Source of Water Teays Aquifer Wabash River Aquifer Tippecanoe County Mid. Wabash Reservoirs Waverly Aquifer River Road Aquifer Big Blue River Aquifer Shelby County East Fork White River Aquifer Bartholomew County Lake Monroe

Monroe County Paragon Aquifer Brookville Reservoir Wabash River Aquifer Transmission Route 2 Along Railways ~ 71 miles Route 1 Along US-52 & I-65 ~ 66 miles White

River WTP Route Transmission White River WTP Source : Brookvill e Lake 60 m gd ~74 miles Supply Estimate Considerations A geometry-based estimate may

grossly underestimate the available storage from a reservoir When modeled, the Geist Reservoir was determined to have 487 days storage, as compared to 161 days (estimated using a geometric approach) 3 times the storage If we apply the same factor to Morse Reservoir, supply can be estimated to last 111 183 days Geist Reservoir Supply Estimate Approa ch 1 Geometry Approach Assumes

No inflow to reservoir 29.3 mgd demand Approach Approach 2 Model Assumes Days = Usable Volume (MG) Supply Demand (MGD) 161 days Simulated drought

conditions with regard to precipitation and evaporation 29.3 mgd demand 487 da ys days 19 Geist Reservoir Volume Geist Reservoir Dimensions 1,900 1,800 1,700 1,600 1,500 1,400 5%

Surface Area (acres) 1,300 25% 100% 1,200 1,100 1,000 900 800 700 600 500 400 300 200 100 0 0 300

600 900 1,200 1,500 1,800 2,100 2,400 2,700 3,000 3,300 Volume (MG)

3,600 3,900 4,200 4,500 4,800 5,100 5,400 5,700 6,000 6,300 Geist Reservoir Simulation (25% unusable reservoir volume, 29.3 mgd demand, 5 mgd minimum

stream flow) 6,500 Full 6,000 5,500 Remaining Storage (MG) 5,000 4,500 4,000 3,500 3,000 2,500 2,000 Empty 1,500 1,000 500 487

days 0 Oct-33 Apr-34 Oct-34 Apr-35 Oct-35 Apr-36 Oct-36 Apr-37 Oct-37 Apr-38 Oct-38 Apr-39 Oct-39 Apr-40 Oct-40 Apr-41 Oct-41 Apr-42 Oct-42 Apr-43 Oct-43 1933 1943 Geist Reservoir Fall Creek System Raw Water Yield Estimates 38 36.7 37 36.1 36 35.5 34.8

35 Safe Yield (mgd) 34.2 34 33 31.9 32 31.3 30.6 31 30.0 30 29.3 29 28 0

5 10 15 20 Unusable Volume Assumption (% of Total) No Minimum Release from Keystone Dam 5 mgd Minimum Release from Keystone Dam 25 USGS stream gage 03352200 Fa ll C re

ek Mu dC r ee k Geist Reservoir Fall Creek Surface Water System Fall Creek WTP Millersville USGS stream gage 03352500 Keystone Dam Geist Reservoir Dam Fortville USGS

stream gage 03351500 Geist Reservoir Fall Creek Surface Water Balance Model Precipitati on from entire drainage area Precipitati on from entire drainage Flow from area Mud Creek into Fall

Creek Geist Reservoir F Cr all ee k Ev Flow to Fall Creek WTP Fall Creek Flow (Millersville Gage) Fall Creek Flow (Fortville Gage)

m ro ir f on rvo i t e a or res p a Geist Reservoir Supply Estimate Approach 1 Geometry Assumes No inflow to reservoir 29.3 mgd demand 161 days

Approach 2 Model Assumes Simulated drought conditions with regard to precipitation and evaporation 29.3 mgd demand 487 days WTP Capacity During Drought New Existing WTP = Yield WTP Capaci Capacity ty New WTP= 1.31 x 29.3 32 Capaci

ty New WTP = 6.4 mgd Capaci ty Assumes: drought of record, 25% unusable reservoir volume, no groundwater use

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