NCDWR September 2009 1

Validation of NRBHM OASIS

Model Version:SimBase Intermediate version modified in August 2009

Assumptions:– Demand 2007 – Actual monthly pattern for daily average – WWRF 2007

• Actual monthly pattern for daily average for demand nodes as pattern [Not a function of demand data - changed return flow OCL file].

• Actual monthly pattern for daily average for direct return flow nodes as inflow– Beginning of Yr 2007 Reservoir Levels– No actual Agricultural Data - used as calculated by the model– No actual Evaporation Data - used as calculated by the model– No Actual Reservoir Drought/Special Operation

Input Data File Location:• F:\DATA\RBMS\Neuse Basin\Neuse Model\01 OASIS - Neuse Hydrologic Modeling\Validation Run Inputs.xls

NCDWR September 2009 2

Validation of NRBHM OASIS

Comparison of Computed vs. Historical Operation:– Falls Lake Elevation– Falls Lake and Beaver Dam Total storage percent– Falls Lake and BD Total WS - WQ percent– Falls Lake Release

– West Fork Eno River Reservoir Elevation– West Fork Eno River Reservoir Release

– Lake Orange Elevation– Lake Orange Release

– Little River and Lake Michie Elevations– Little River and Lake Michie Releases

NCDWR September 2009 3

Validation of NRBHM OASIS

Comparison of Computed vs. Historical Data:• Hillsborough Gage Data – node 110

• Clayton Gage Data – node 630

• Princeton Gage Data – node 750

• Goldsboro Gage Data – node 780

• Kinston Gage Data – node 800

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Falls Lake – Beaver Dam Operation

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Wake County Voluntary - DM Levels

03/13/2007 D0 - Abnormally Dry

04/17/2007 No Drought  

05/01/2007 D0 - Abnormally Dry

06/26/2007 D1 - Moderate

08/14/2007 D2 - Severe  

09/04/2007 D3 - Extreme

10/02/2007 D4 - Exceptional

10/30/2007 D3 - Extreme

11/20/2007 D4 - Exceptional

12/31/2007 D4 - Exceptional

D4

D2

D1

D3

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Upper Rule Curve = 251.5 ‘

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@ 249’ Falls Elevation = BDam Elevation

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Lower Rule Curve = 236.5 ‘

Upper Rule Curve = 251.5 ‘

Winter Piggyback Release

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Upper Eno Operation

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Stage 1

Stage 2

Stage 3

Stage 4

Withdrawal Restriction Period 2007

Stage 1: May 27 Stage 2: Jul 31 Stage 3: Sep 5Stage 4: Sep 28 Stage 5: Nov 8

Stage 5

Drought Operation??

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Upper Rule Curve 633’

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Upper Rule Curve 633’

Lower Rule Curve 603’

Tier 1

Tier 2

Tier 3

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Stage 1

Stage 2

Stage 3

Stage 4 Stage 5

Withdrawal Restriction Period 2007

Stage 1: May 27 Stage 2: Jul 31 Stage 3: Sep 5Stage 4: Sep 28 Stage 5: Nov 8

Upper Rule Curve 615’

~ 6’ D/D

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Upper Rule Curve 615’

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Dead Storage 601.7’

Stage 4Stage 5

Zero outflow for 2 days in Dec 07

Withdrawal Restriction Period 2007

Stage 1: May 27 Stage 2: Jul 31 Stage 3: Sep 5Stage 4: Sep 28 Stage 5: Nov 8

Stage 1

Stage 2

Stage 3

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Dead Storage 198.6 AF

Lowest Storage 198.3 AF

0% remaining storage for 8 consecutive days from 12/20/07

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Durham Systems

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Gage Flows

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Stage 1

Stage 2

Stage 3

Stage 4 Stage 5

Instream Flow Requirements @ HB Gage

Stage 1: 1.75 MGD – [May 27] Stage 2: 1.13 MGD – [Jul 31] Stage 3: 1.1 MGD – [Sep 5]Stage 4: 1.1 MGD – [Sep 28]Stage 5: 0.65 MGD – [Nov 8]

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10% CLoss @ 4 – 12 cfs

20% CLoss @ <4 cfs

0% CLoss @ > 12 cfs

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Clayton Target 184 cfs Clayton Target 184 cfs

Clayton Target Safety Factor

Clayton Target 254 cfs

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Clayton Flood Control Max Target Flow 5332 cfs

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Flood Control Target Flow = 6003 cfs

Min calculated flow = 101 cfs

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Flood Control Target Flow = 7168 cfs