Transcript Slide 1

Water
(Environmental)
2 Considerations
Impact of RSA Agreement on Town Water
Supply
 Drought

Impact of RSA Agreement
on Town Water Supply
The Facts
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Water plant can produce sustained (30 day
production) 2 mgd.
The Town, by contract, must provide 1.1 mgd to
Gville/RSA thru 2023, if they want it.
This leaves the Town with .9 mgd.
Town maximum day demands are approximately
1.1 mgd.
Health Department requires plant expansion at
80% of capacity (1.6 mgd).
Maximum day
supply to
G’ville/RSA =
1.1 mgd
Maximum day
supply to
Town = .9 mgd
3 scenarios
1.
2.
3.
Scenario 1: G’ville and RSA maximum day
demand in 2007 @ .3 mgd. The Town’s daily
maximum is .6 mgd.
Scenario 2: G’ville and RSA maximum day
demand increases to contract maximum @ 1.1
mgd. The Town’s daily maximum is .8 mgd.
Scenario 3: G’ville and RSA maximum day
demand increases to contract maximum @ 1.1
mgd. The Town’s daily maximum is 1.2 mgd.
Scenario 1: G’ville and RSA maximum day
demand in 2007 @ .3 mgd. The Town’s daily
maximum is .6 mgd.

This is what demand generally is in 2007
on “average” days.
Town must upgrade
plant @ 1.6 mgd
Current excess
average
available capacity
= 1.1 mgd
G’ville and RSA current
maximum day demand
= .3 mgd
Town maximum day
Maximum demand
.9 mgd
Town’s current max.
day demand = .6
Scenario 2: G’ville and RSA maximum day
demand increases to contract maximum @
1.1 mgd. The Town’s daily maximum is .8
mgd.
 .8 mgd happens during year somewhat
frequently.
 This is the maximum amount that RSAGordonsville contract allows.
 This might happen if RSA adds new
plants, leading to maximum demand of
.275 and Gville increases to .825
(projected in 2020 or 2030).
Point at which new water plant
upgraded = 1.6 mgd
Excess
capacity
= .1 mgd
G’ville and RSA
maximum day
Demand = 1.1 mgd
Town maximum day
Demand .9 mgd
Town’s
Maximum day
demand = .8
Scenario 3: G’ville and RSA maximum day
demand increases to contract maximum @
1.1 mgd. The Town’s daily maximum is 1.1
mgd.
1.1 mgd happens occasionally now.
 1.1 mgd is the maximum day demand the
Town must supply Gville and RSA, should
they want it.
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TOWN
Deficit of .2 mgd
G’ville and RSA
maximum day
Demand = 1.1 mgd
Town’s
Maximum day
demand = 1.1
Plant current
Capacity = 2 mgd
Point at which new
water plant
upgraded = 1.6 mgd
Town maximum
Day allowable
Demand .9 mgd
Water Supply Findings
There currently appears to be enough
water because Gville and RSA do not
demand all their contract allows (1.1 mgd).
 Should they want it all and the Town has a
maximum demand day (1.1 mgd), A
TOWN DEFICIT OF .2 MGD WOULD
RESULT.
 Such a deficit could only be maintained for
approximately 30 days from RWSB.
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The Town may already exceed health
department 80% rule to construct new
water supply on maximum demand days.
Impact of Drought on Town
Water Supply
Facts
River has never “dried” up.
 Water plant has always been able to pull
water from river, even in 2002.
 Water restrictions are based on flow at
Culpeper gage, not flow into our plant.
 Water restrictions go into effect regardless
of how much water we pull from river.
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Unless there is DRAMATIC climate
change, there is little danger of “running
out of water” during drought.
Summary
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The Town has a monthly average demand
buffer of around .3 mgd until water plant must be
upgraded.
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Approximately 800 homes and associated retail
If Health Department 80% rule is based on
maximum day demand, the Town may need to
construct water plant very soon.
The greatest threat to Town water supply is not
currently drought, rather, the 44 cfs flow
standard and RSA agreement.