delaware - usgsva.water.usgs.gov/delwkshp2005/presentations/... · white clay creek at stanton...
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Delaware
Public Water Supply System Service Areas
New Castle County
Public Water Demand in Northern Delaware
Residential48% (33 mgd)
Industrial18% (12 mgd)
Commercial21% (14 mgd)
Unaccounted13% (9 mgd)
Figure 4: Brandywine Creek at Wilmington Streamflow Data,October 2001 - December 2002
*The 7Q10 is the minimum flow necessary to protect f ishery and habitat that is likely to occur for 7 consecutive days, once every 10 years
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rNove
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r
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ary
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ry
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Augus
tSep
tembe
r
Octobe
rNove
mber
Decembe
r
Month
Flow
: Mill
ion
Gal
lons
per
Day
BWW BWW 7Q10
Record Low Flow: (21mgd) 23 August 2002
Figure 11: Chlorides, White Clay Creek at Stanton, July 2002 - November 2002
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8/27
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/02
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Date
Chl
orid
es (m
g/L)
Intake Chlorides Plant Effluent Chlorides USEPA MCL (250 ppm)
Lowest stream flows on the Brandywine Creek at Chadds Ford, PA from 1911-2001(*Data for the years 1954-1961 was unavailable*)
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1911 1916 1921 1926 1931 1936 1941 1946 1951 1956 1961 1966 1971 1976 1981 1986 1991 1996 2001
Year
Stre
am F
low
(mgd
)
Brandywine Creek at Chadds Ford, Streamflow v. Cumulative Precipitation
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8/28/636
9/10/648
9/12/661
9/8/954
8/5/992
8/22/020
Lowest Recorded Streamflow of Year, Sorted by Date
Flow
(mgd
)
0.00
10.00
20.00
30.00
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90.00
Pre
cipi
tatio
n (in
ches
)
FLOW (mgd)Population6 month12 month24 month
Figure 18. Estimate of Low Flow Recurrence Interval with the Weibull Distribution
Brandywine Creek at Chadds Ford - 1972-2001
0.001
0.01
0.1
1
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Flow, Q (mgd)
Prob
abili
ty o
f Reo
ccur
renc
e, P
Low Flow 21 mgd Aug 23, 2002
p = 0.01, 100-yr. recurrence interval
2020 Supply/Demand Curve (2020 Supply/Demand Curve (mgdmgd))
Scenario Supply Demand +/- Vol (mg)1. No 7Q10 93 90 +3 180*
2.7Q10 Wc 85 90 - 5 -300*
3.7Q10 B&W 73 90 - 17 -1020*
* Volume required assuming a 60-day drought period
FUTURE WATER SUPPLY OPTIONSFUTURE WATER SUPPLY OPTIONS““AA”” LISTLISTCOMMITTED TO BY WATER PROVIDERSCOMMITTED TO BY WATER PROVIDERS• Newark Reservoir 300 mg• Access Hoopes Reservoir 500 mg• AWC Wells N. of C & D Canal 120 mg• Newark S. Wells Iron Treatment 60 mg• Artesian ASR Wells 120 mg
Total 1100 mg
FUTURE WATER SUPPLY OPTIONSFUTURE WATER SUPPLY OPTIONS““BB”” LISTLISTACHIEVABLE IN LONGER TERMACHIEVABLE IN LONGER TERM
• Increase CWA/AWC Inter. 180 mg• Raise Hoopes Reservoir WL 300 mg• AWC C&D Canal Pipeline 300 mg• Philadelphia to DE Pipeline 1200 mg• Bread & Cheese Is. Reservoir 500 mg
HoopesHoopes ReservoirReservoir
TCS
White Clay Creek at Stanton
White Clay Creek at Stanton Stream Profile7Q10 Conditions
UWD Stanton Intake
13843 (0.96)
14073 (0.85)
10800 (0.90)
AMTRAK Bridge
-3.00
-2.00
-1.00
0.00
1.00
2.00
3.00
4.00
5.00
6.00
7900840089009400990010400109001140011900124001290013400139001440014900
Distance from mouth of White Clay Creek (feet)
Elev
atio
n ab
ove
mea
n se
a le
vel (
feet
)
Streambed Elevation 7Q10 WSEL (at low tide) 7Q10 WSEL (w ith TCS at low tide) 7Q10 (at high tide) Critical Depths
White Clay Creek Cross-Section 10800Critical Depth
-3
-2
-1
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1
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3
4
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7
8
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Horizontal Station (feet)
Elev
atio
n ab
ove
mea
n se
a le
vel (
feet
)
Streambed Elevation 7Q10 WSEL (at low tide) 7Q10 (at high tide)
White Clay Creek at StantonWhite Clay Creek at StantonStation 10800Station 10800
00.5
11.5
22.5
33.5
44.5
0 1 2 3 4 5 6 7 8 9 10 11 12Tidal Cycle (Hours)
Dep
th (f
t) Depth
At 7Q10 = 17.2 mgd, TCS uninflated
DGS Watershed Mapsouthern New Castle County
(Baxter and Talley, DGS, Aug 1996)
Availability vs. Supply Availability vs. Supply southern New Castle Countysouthern New Castle County
Watershed Availability SupplyC & D Canal, Aug. Cr. 2.62 3.57Drawyer Cr./Appo. R. 5.73 4.67Blackbird Creek 3.94 0.22Cedar swamp 0.31 0.00Smyrna River 2.83 1.05Cypress Branch/Chester R. 1.54 0.00Sassafras River 1.37 0.00Great Bohemia Creek 1.18 0.40Back Creek 0.55 3.42
Total So. NCC 20.07 mgd 13.33 mgd
PopulationPopulationsouthern New Castle Countysouthern New Castle County(Source: DE Population Consortium, 2004)(Source: DE Population Consortium, 2004)
0
10,000
20,000
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2010
2020
2030
Year Pop. % Increase2000 29,682 0 %2005 36,792 24%2010 42,420 15%2015 47,985 13%2020 59,992 12%2025 68,115 14%2030 74,587 10%
30 year increase = 151%
Public Water DemandPublic Water Demandsouthern New Castle Countysouthern New Castle County
Year Population Indiv. Wells Water Demand(4000 wells) Normal Peak= 12,000 pop. (100 gpcd) (200 gpcd)
2000 29,682 17,682 1.7 3.5 2005 36,792 24,792 2.5 5.02010 42,420 30,420 3.1 6.12015 47,985 35,985 3.6 7.22020 59,992 47,992 4.8 9.62025 68,115 56,115 5.6 11.22030 74,587 62,587 6.3 mgd 12.5 mgd
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