Stefanie J. Baxter

Presented to the Presented to the Water Supply Coordinating CouncilWater Supply Coordinating Council

September 24, 2009September 24, 2009

Summary of Summary of Water Conditions in DelawareWater Conditions in Delaware

Factors Used in Calculating

the Index

6-month antecedent

precipitation

Flow on the Brandywine

River

Groundwater level in well

Db24-18

Population of northern NCC

Water Conditions Index for NCCWater Conditions Index for NCCAugust 2008 through August 2009August 2008 through August 2009

Drought WatchDrought Warning

Drought Emergency

4.3

13.44

0

2

4

6

8

10

12

14

Aug-08 Sep-08 Oct-08 Nov-08 Dec-08 Jan-09 Feb-09 Mar-09 Apr-09 May-09 Jun-09 Jul-09 Aug-09

Precipitation at Wilmington Precipitation at Wilmington August 2008 – August 2009August 2008 – August 2009

Data provided byCity of Wilmington,

DEOS, and NWS

Current 12-monthrunning surplus = 1.70 inches

Inch

es

NormalActual

0.00

1.00

2.00

3.00

4.00

5.00

6.00

7.00

8.00

Aug-08 Sep-08 Oct-08 Nov-08Dec-08 Jan-09 Feb-09 Mar-09 Apr-09 May-09 Jun-09 Jul-09 Aug-09 Sep-09 Oct-09 Nov-09Dec-090.00

1.00

2.00

3.00

4.00

5.00

6.00

7.00

8.00

Well Db24-18 Near OgletownWell Db24-18 Near OgletownJanuary 2008 – September 2009January 2008 – September 2009

Drought Watch = 14.00 to 14.99'Drought Warning = 15.00 to 15.99'

Drought Emergency = >16.00'

Actual September water level = 12.10'

Data Source:http://waterdata.usgs.gov

/de/nwis/

Brandywine Creek at WilmingtonBrandywine Creek at WilmingtonApril 1, 2009 – September 21, 2009April 1, 2009 – September 21, 2009 Drought Watch = 85 MGD

195 MGD

30-day moving averagethrough September 21, 2009 = 267.4 MGD

Data Source:http://waterdata.usgs.gov

/de/nwis/

White Clay Creek near NewarkWhite Clay Creek near NewarkApril 1, 2009 – September 21, 2009April 1, 2009 – September 21, 2009

Drought Watch = 42 MGD

30-day moving average White Clay at Stanton (filter plant)

through September 21, 2009 = 156.2 MGD

44 MGD

Data provided byDelaware Department

of Transportation

Precipitation at DoverPrecipitation at DoverAugust 2008 – August 2009August 2008 – August 2009

Inch

es

NormalActual

0

1

2

3

4

5

6

7

8

9

10

A-08 S-08 O-08 N-08 D-08 J-09 F-09 M-09 A-09 M-09 J-09 J-09 A-09 S-09 O-09 N-09 D-090

1

2

3

4

5

6

7

8

9

10

Current 12-month running surplus = 2.55 inches

Well Hb14-01 Well Hb14-01 January 2008 – September 2009January 2008 – September 2009

Actual September water level = 8.20'

Normal for September is between 6.79' and 9.07'

Modified from:http://waterdata.usgs.gov

/de/nwis/

St. Jones River at DoverSt. Jones River at DoverApril 1, 2009 – September 21, 2009 April 1, 2009 – September 21, 2009 Mean flow for September = 20.2 MGD

8.4 MGD

30-day moving averagethrough September 21, 2009 = 51.4 MGD

Data provided byCity of Lewes

Precipitation at Lewes Precipitation at Lewes August 2008 – August 2009August 2008 – August 2009

Inch

es

NormalActual

0

1

2

3

4

5

6

7

8

Aug-08 Sep-08 Oct-08 Nov-08 Dec-08 Jan-09 Feb-09 Mar-09 Apr-09 May-09 Jun-09 Jul-09 Aug-09 Sep-09 Oct-09 Nov-09 Dec-090

1

2

3

4

5

6

7

8

Current 12-monthrunning surplus = 6.21 inches

Well Qe44-01 Near Trap PondWell Qe44-01 Near Trap PondJanuary 2008 – September 2009January 2008 – September 2009

Normal for September is between 8.90' and 11.30'

Actual September water level = 8.20 '

Nanticoke River near Bridgeville Nanticoke River near Bridgeville April 1, 2009 – September 21, 2009April 1, 2009 – September 21, 2009

Modified from:http://waterdata.usgs.gov

/de/nwis/

48 MGD

30-day moving averagethrough September 21, 2009 = 71.1 MGD

Mean flow for September = 50.3 MGD