2004 IBT Annual Report final

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2004 ANNUAL REPORT on INTERBASIN TRANSFERS
For
RTP South and the Towns of Cary, Apex, and Morrisville

Prepared for:
Town of Apex
Town of Cary
Town of Morrisville
RTP South/Wake County

Submitted to:
North Carolina Division of Water Resources

April 2005

Prepared by:
Leila R. Goodwin, P.E.
Water Resources Manager
Town of Cary
P.O. Box 8005
Cary, NC 27512-8005
919-462-3846
[e-mail]

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Table of Contents
Executive Summary...............................................................................................................ES-1
1. Jordan Lake Allocation Monitoring.........................................................................1-1
2. IBT Monitoring............................................................................................................2-1
3. Compliance with Certificate Conditions ................................................................3-1

Appendix A: Daily Tracking of Combined Jordan Lake Water Supply Allocations for
2004...................................................................................................................A-1
Appendix B: Daily Interbasin Transfer Estimates for 2004.............................................B-1

2004 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
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Executive Summary
The 2004 Annual Report on Interbasin Transfers for RTP South and the Towns of Cary,
Apex, and Morrisville includes monitoring data for daily tracking of IBT amounts and
combined Jordan Lake allocations held by the certificate holders.
In 2004, the certificate holders complied with all conditions of their IBT certificate. The
maximum daily IBT amount for Cary, Apex, Morrisville, and RTP South was 22.6 million
gallons per day (mgd). The annual average IBT amount was 14.2 mgd. IBT amounts and a
summary of Jordan Lake withdrawals are provided in Table ES-1. The daily IBT amounts in
2004 for Cary, Apex, Morrisville, and RTP South are shown in Figure ES-1.
TABLE ES-1. Summary of InterBasin Transfers for Cary, Apex, Morrisville and RTP South

Withdrawal from Haw
Subbasin
(mgd)1
Total Return to Haw
Subbasin
(mgd)
Interbasin Transfer (mgd) IBT as % of Certificate
Calendar
Year
Average
Annual
Max. Day Average
Annual
Max. Day Average
Annual
Max. Day Max.
1998 10.8 15.7 1.7 3.5 9.0 14.3 90%
1999 9.2 15.6 1.6 4.2 7.6 12.9 81%
2000 7.3 14.2 1.1 4.4 6.2 11.8 74%
20012 9.7 18.8 2.8 9.4 6.8 15.0 63%3
2002 16.9 29.2 3.5 10.3 13.5 22.5 94%
2003 15.9 22.7 2.5 5.5 13.4 17.8 89%
2004 17.0 25.5 2.8 6.1 14.2 22.6 94%
1. Includes water use by Cary, Apex, Morrisville, and RTP South.
2. Withdrawals in 2001 were unusually high due to construction activities at the Cary/Apex WTP and do not reflect actual
potable water demands.
3. Permitted IBT amount increased from 16 mgd to 24 mgd in July 2001. The maximum day IBT of 15.0 mgd occurred after the permitted amount increased to 24 mgd.

2004 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
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Figure ES-1: Daily Interbasin Transfer for Cary, Apex, Morrisville and RTP South
[Haw Sub-Basin to Neuse Sub-Basin]
0.00
5.00
10.00
15.00
20.00
1/1/04 2/1/04 3/1/04 4/1/04 5/1/04 6/1/04 7/1/04 8/1/04 9/1/04 10/1/04 11/1/04 12/1/04
Interbasin Transfer (mgd)
Cary Apex Morrisville RTP
2004 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
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1.0 Jordan Lake Allocation Monitoring
The combined Jordan Lake water supply allocation for Cary, Apex, Morrisville, and RTP
South can be tracked on a daily basis. Daily tracking of the combined Jordan Lake
allocation for the period January 1, 2004 through December 31, 2004 is included in Appendix
A. The water supply pools for each allocation holder were full on January 1, 2004.
For 2004, the maximum day withdrawal for all certificate holders was 25.5 mgd, which
occurred on May 18. The average daily withdrawal for all certificate holders was 17.0 mgd
during 2004 (Table 1-1).
TABLE 1-1
Summary of Jordan Lake Withdrawals1
Year Average Annual Withdrawal
(mgd)
Maximum Daily Withdrawal
(mgd)
19982 10.8 15.7
19992 9.2 15.6
2000 7.3 14.2
2001 9.7 18.8
2002 16.9 29.2
2003 15.9 22.7
2004 17.0 25.5
1. Withdrawals from Jordan Lake at the Cary/Apex raw water intake. Includes water use by Apex, Cary, Morrisville and
RTP South. Does not include water use by Durham.
2. Includes water use by Holly Springs from 1/1/98 to 6/30/99

2004 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
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Table 1-2 presents historical water use for the certificate holders (Cary, Apex, Morrisville,
and RTP South) based on finished water produced at the Cary/Apex WTP. In 2004,
finished water demands averaged 14.8 mgd and the maximum day demand was 25.8 mgd.
The maximum day peaking factor was 1.74 in 2004.
TABLE 1-2
Summary of Finished Water Demands
Year
Average Annual
Demand
(mgd)
Maximum Daily Demand (mgd) Maximum Day/Average Day Peaking Factor
19982 12.2 20.1 1.64
19992 12.6 21.5 1.70
2000 13.0 21.6 1.66
2001 14.1 22.0 1.56
2002 14.9 25.6 1.72
2003 14.0 19.9 1.43
2004 14.8 25.8 1.74
1. Includes finished water delivered to the distribution system by the Cary/Apex WTP.
2. Includes water use by Holly Springs from 1/1/98 to 6/30/99.

2004 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
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Water use for Morrisville and RTP South is not measured on a daily basis. Therefore,
accurate daily tracking of Jordan Lake water supply allocations can only be performed for
the combined Jordan Lake water supply allocation for Cary, Apex, Morrsiville, and RTP
South. Figure 1 shows the water supply withdrawals and the allocation storage level for
2004. The combined allocated storage stayed at 100 percent full for all of 2004.
Figure 1. Cary/Apex/Morrisville/RTP South Water Supply Allocation and
Withdrawals for 2004
6,700
8,700
10,700
12,700
14,700
16,700
01/01/04
01/31/04
03/01/04
04/01/04
05/01/04
06/01/04
07/01/04
07/31/04
08/31/04
09/30/04
10/31/04
11/30/04
12/30/04
Storage Level (ac-ft)
10.00
12.00
14.00
16.00
18.00
20.00
22.00
24.00
26.00
28.00
Water Supply Withdrawals (mgd)
Full Pool
= 39% of Water Supply Pool
= 17,862 acre-feet

Individual Jordan Lake water allocations are estimated on a daily basis by estimating daily
water usage for Morrisville and RTP South from monthly records. Daily water use for
Morrisville is estimated from monthly or more frequent retail meter readings by assuming
that water usage variations between meter readings follow the same patterns as the total
combined water use (“Net Cary” use). Daily water use for RTP South is estimated similarly
using monthly retail meter readings. By assuming that water usage trends throughout the
month follow similar patterns as for Cary. For a given day, the ratio of daily Net Cary water
use to average net Cary water use for the period between meter readings is applied to
Morrisville and RTP South metered water use.
Levels in individual water supply pools are calculated on a daily basis using daily water use
estimates and daily lake inflows. Lake inflow data is obtained from the US Army Corps of
Engineers and allocated to each water supply pool according to the percentage allocation
held. Any inflow amount that would fill the allocated storage above 100 percent is not
stored. Any time the elevation in Jordan Lake is at or above 216 feet mean sea level, the
water supply pools are reset to 100 percent full. If any allocation holder or larger pool has
excess inflow, it is first distributed within that pool to another user, if needed, before being
“spilled”.

2004 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
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The daily Cary/Apex withdrawal amounts are estimated by subtracting the estimated daily
Morrisville and RTP amounts from the metered total daily use; Cary amounts are then
estimated by subtracting the daily recorded Apex use from the remainder. Cary/Apex
holds a water supply storage allocation equal to 32 percent of the water supply pool or 9,618
acre-feet.
The allocated storage for each of the four users – Cary, Apex, Morrisville and RTP South –
remained at 100 percent full for all of 2004.
2004 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
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2.0 IBT Monitoring
Daily IBT estimates for the certificate holders are included in Appendix B. Estimates are
provided for the period January 1, 2004 through December 31, 2004. The maximum day IBT
transfer during the calendar year 2004 was 22.6 mgd, which occurred on May 29, 2004. This
represents 94 percent of the permitted IBT transfer under the certificate approved by the
EMC on July 12, 2001. The annual average IBT transfer was 14.2 mgd during calendar year
2004.
The average daily consumptive use was 15% for the period January 1, 2004 through
December 31, 2004. Historical consumptive use is shown in Table 2-1.
The distribution of consumptive uses between the Haw, Cape Fear, and Neuse River
subbasins for 2004 was based on historical water use in each basin as determined by billing
records for each certificate holder. For 2004, it was assumed that 21% of water use occurred
in the Haw subbasin, 0.6% of water use occurred in the Cape Fear subbasin, and 78.4% of
water use occurred in the Neuse River subbasin. The certificate holders have begun
tracking historical use by assigning a subbasin to each customer. Data on the distribution of
water use between subbasins for each entity from 2000 through 2004, based on billing
records, is shown in Table 2-2.
In 1998, 1999, and 2000 Apex and Cary implemented mandatory irrigation restrictions due
to water supply limitations and IBT permit restrictions. The Town of Morrisville asked
residents to voluntarily conserve water beginning in 1998, and implemented mandatory
water use restrictions in July 1999. The restrictions reduced consumptive water use from
what would normally be expected during those years. In 2002 all the Towns had mandatory
restrictions because of regional drought conditions, but they were implemented after June,
which was when all-time high water use occurred. There were no water restrictions in 2003
or 2004.
TABLE 2-1
Historical Consumptive Use for Cary, Apex, Morrisville, and RTP South
Year
Average Daily Finished
Water Demand
(mgd)
Average Daily
Consumptive Use
(mgd)
% Consumptive Use
19981 12.2 2.4 19.7%
19991 12.6 2.1 16.7%
2000 13.0 1.8 13.8%
2001 14.1 2.0 14.7%
2002 14.9 3.0 20.0%
2003 14.0 1.4 10.0%
2004 14.8 2.2 15.0%
1. Includes some water use by Holly Springs. Holly Springs purchased water from Apex in 1998 and 1999.
2004 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
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TABLE 2-2 Distribution of Water Billed to Retail Customers by River Subbasin
Year Cary Apex Morrsiville1 RTP South

Total
Water
Use (mgd)
Water
Use in
Haw (mgd)
% Use
in Haw
Total
Water
Use (mgd)
Water
Use in
Haw (mgd)
% Use
in Haw
Water Use in
Cape
Fear (mgd)
% Use
in Cape
Fear1
Total
Water
Use (mgd)
Water
Use in
Haw (mgd)
% Use
in Haw2
Total
Water
Use (mgd)
Water
Use in
Haw (mgd)
% Use
in Haw
2000 9.29 0.82 8.8% 1.65 0.82 49.9% 0.07 4.3% 0.86 0.05 6.20% 0.27 0.27 100%
2001 10.73 1.07 10.0% 1.88 1.03 54.8% 0.08 4.3% 1.05 0.06 6.20% 0.31 0.31 100%
2002 10.23 1.23 12.0% 2.15 1.29 60.0% 0.08 3.7% 1.18 0.14 11.2% 0.39 0.39 100%
2003 9.02 0.75 8.3% 1.94 1.15 59.3% 0.073 3.8% 1.10 0.15 14.0% 0.36 0.36 100%
2004 9.69 1.21 12.5% 2.12 1.28 60.2% 0.080 3.8% 1.26 0.19 14.9% 0.39 0.39 100%
1. Water use by basin for the Town of Morrisville is unavailable for 2000, and so was assumed to be the same as in 2001.
2004 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
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Table 2-3 shows the combined water use for each of the certificate holders and the
percentage water use in the Haw and Cape Fear River Subbasins.
TABLE 2-3
Historical Water Use in the Haw and Cape Fear River Subbasins for Cary, Apex, Morrisville, and RTP South
Year Total Billed
Water Use
(mgd)
Water Use in
Haw Subbasin
(mgd)1
Percent Use in
Haw Subbasin
Water Use in
Cape Fear
Subbasin
(mgd)1
Percent Use in
Cape Fear
River Subbasin
2000 12.07 1.97 16.3% 0.07 0.6%
2001 13.97 2.47 17.7% 0.08 0.6%
2002 13.95 3.05 21.8% 0.08 0.6%
2003 12.42 2.41 19.4% 0.07 0.6%
2004 13.46 3.06 22.8% 0.08 0.6%
1. Water use by subbasin for the Town of Morrisville is unavailable for 2000, and so was assumed to be the same as in 2001.

For purposes of calculating daily IBT amounts in 2004, the certificate holders used 21% for
the portion of their water use that occurred in the Haw subbasin and 0.6% as the portion
used in the Cape Fear subbasin. For purposes of calculating daily IBT amounts in 2005, the
certificate holders estimate that 23% of their water use will occur in the Haw subbasin and
that 0.6% of their water use will occur in the Cape Fear subbasin.
2004 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
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3.0 Compliance with Certificate Conditions
A summary of the conditions of the IBT certificate dated July 12, 2001 along with the current
status of compliance for each is provided below.
Condition 1 (2010 Required Return)
The holders of the certificate, after 2010, shall return water supplied from the Haw River Basin used
in the Neuse River Basin to either the Haw or Cape Fear River Basins as described below.
a) Any water use in the Neuse Basin in excess of 16 million gallons per day adjusted on an
average daily basis shall be returned.
b) Water used for consumptive purposes in the Neuse Basin will not be subject to this condition
Compliance with this condition is not required until after 2010. However, the calculations
for determining compliance with Condition 1 are shown in Table 3-1. Note that revised
calculations for 2001 result in different values then were included in the 2001 Annual
Report.
Cary, Apex and Morrisville are implementing the Western Wake Regional Water
Reclamation Facility, and Holly Springs is participating in the effluent discharge facilities to
the Cape Fear River below Buckhorn Dam. The project partners are in the permitting and
financing stages of the project and expect to begin design in 2005. More information about
the status of the study can be found at the Western Wake Regional Water Management
Facilities website at www.westernwakepartners.org.
TABLE 3-1
Summary of Compliance with Certificate Condition No. 1
Year
Neuse
Finished Water from
the Haw
(mgd)
Peaking
Factor
16 mgd
MDD
adjusted to
ADD
Consumptive Use Factor
(%)
Neuse
Consumptive Use (from the
Haw)
(mgd)
Required
Return if
After 2010
(mgd)
Amount Returned
(mgd)
(a) (b) (c)=16/(b) (d) (e)=(a)*(d) (f)=(a)-(c)-
(e)
(g)
2001 6.8 1.64 9.8 20% 1.4 0.0 0
2002 13.5 1.64 9.8 20% 2.7 1.0 0
2003 13.4 1.64 9.8 20% 2.7 1.0 0
2004 14.2 1.64 9.8 20% 2.8 1.6 0
a = Average annual transfer from Haw to Neuse (see Table B-1)
b = Peaking factor specified in Certificate for first year, and to be approved by DWR thereafter
d = Percent consumptive use specified in Certificate for first year and to be approved by DWR thereafter
g = Average annual wastewater discharges and water reuse in Haw and Cape Fear Basins (see Table B-1)
2004 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
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Condition 2 (Facilitate Allocation Use)
The holders of this certificate shall manage the authorized transfer amount in such a way that none of
the individual petitioners (Towns of Cary, Apex, Morrisville, and Wake County [for RTP South]) are
prevented from fully using their respective Jordan Lake water supply allocations.
The IBT was not a limitation on Jordan Lake withdrawals for any of the allocation holders in
2004.
Condition 3 (Disagreggation of IBT Amount)
If the certificate holders discontinue their cooperative service agreement with each other, the
maximum day permitted transfer will be adjusted by the Division of Water Resources based on the
2030 projected of each applicant at that time.
The cooperative service agreements between the certificate holders have remained in effect
during 2004.
Condition 4 (Compliance and Monitoring Plan)
Prior to transferring water under this certificate, the holders of this certificate shall work with the
Division of Water Resources to develop compliance and monitoring plan subject to approval by the
Division. The plan shall include methodologies and reporting schedules for reporting the following
information: maximum day transfer amounts, compliance with permit conditions, progress on
mitigation measures, drought management, and reporting. A copy of the approved plan will be kept
on file with the Division for public inspection. The Division of Water Resources shall have the
authority to make modifications to the compliance and monitoring plan as necessary to assess
compliance with the certificate.
Cary, Apex, Morrisville, and RTP South submitted a Compliance and Monitoring Plan
concurrent with the submittal of the 2001 report. In 2003 the Division of Water Resources
agreed to modify the submittal date of each annual report to be May 1 of the following year.
Condition 5 (EMC Consideration of Impacts)
If either the EIS is found at a later date to be incorrect or new information becomes available such that
the environmental impacts associated with this transfer are substantially different from those
projected impacts that formed the basis for the above Findings of Fact and this certificate, the
Commission may reopen the certificate to adjust the existing conditions or require new conditions to
ensure that the detriments continue to be mitigated to a reasonable degree.
This condition requires no action by the certificate holders.
Condition 6 (Intake Access)
The Towns of Cary and Apex shall be required to provide access at their existing intake site to other
Jordan Lake water allocation holders that need access to utilize their allocation to the extent that this
additional use is determined to be feasible by the Division of Water Resources. The cost associated
with getting the necessary permits, engineering design, and associated construction costs are the
responsibility of the allocation holder(s) requesting the access and not Cary and Apex.
The Town of Cary has continued to provide retail water service to RTP South and has an
agreement with the Town of Morrisville for water treatment. The Towns of Cary and Apex
2004 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
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have also entered into an agreement to allow Chatham County access to the Cary/Apex raw
water intake on Jordan Lake.
Condition 7 (Drought Management Plan)
Prior to transferring water under this certificate, the Towns of Cary, Apex, and Morrisville, and
Wake County (for RTP South) shall develop individual water shortage response plans subject to
approval by the Division. The holders of this certificate shall develop a drought management plan for
the interbasin transfer, incorporating the individual water shortage response plans and subject to
approval by the Division. The plans shall tie specific water conservation actions to the percent
storage remaining in each of the petitioners’ Jordan Lake water supply accounts. A copy of the
approved plans shall be kept on file with the Division for public inspection. The Division of Water
Resources shall have the authority to approve modifications to the drought management plan as
necessary.
Water Shortage Response Plans for each certificate holder were submitted as attachments to
the 2001 Annual Report.
Condition 8 (Stream Buffer Rules)
Within six months from the effective date of this certificate, the Towns of Cary, Apex, and
Morrisville, and Wake County (for RTP South) shall enact ordinances similar to or more protective
than the Neuse River buffer rules (15A NCAC 2B.0233) for the parts of their jurisdictions that are
within the Jordan Lake watershed. These buffer requirements shall be subject to approval by the
Division of Water Resources after consultation with the Division of Water Quality and shall be
adopted as local ordinances.
Each Town’s buffer ordinance was submitted with the 2001 Annual Report.

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Appendix A:
Daily Tracking of Combined Jordan Lake Water Supply
Allocations for 2004
2004 ANNUAL REPORT ON INTERBASIN TRANSFERS for RTP South and the Towns of Cary, Apex, and Morrisville
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Appendix B
Daily Interbasin Transfer Estimates for 2004