CITY PARK GETS SWAMPED Studio 4: From the gutter to the gulf New Orleans, LA Spring 2009 This project investigates the use of New Orlean’s City Park to manage the stormwater flowing through the Orleans Canal, which runs along the park’s west side. The Orleans Canal is fed by Pumping Station No. 7 which drains its own district no. 7 as well as a portion of drainage district no. 2. City Park, at 875 acres, is the largest park in New Orleans, and has sufficient area to collect and store all the stormwater that flows from Pumping Station No. 7. Although heavily programmed in the southern portion, the area north of the interstate is largely undeveloped. I propose a series of side flow weirs to direct stormwater from the canal to three ponds within the northern portion of City Park. At these ponds, I propose a vegetative strategy to filter and absorp water as well as supporting habitat.
AERIAL OBLIQUE: CITY PARK , ORLEANS CANAL AND SWAMP RESTORATION
Species such as black willows have enormous water absorption rates and baldcypress trees tolerate flooded conditions and poor soils. Both have phytoremediation potential and are native to the region. Cypress swamps are also places of recreational potential as well as recharging depleted groundwater.
Best Management Practice: 5-7% of developed area for stormwater retention.
CONCEPT
5-7% of 4660 acres:
City Park
BAYOU ST. JOHN
ORLEANS CANAL
233 to 326 acres
Rob
ert
City Park (north of I-610) is 875 acres, about 3X as much required for handling all the stormwater from Pump Station 7.
875 Acres
OR Rob
ert
E. L
SEA
Blv
d
AL
0 -8’ B.O.
District
Pump Station 7 also handles stormwater from L Station 2. EPump
LEV
ee
+15’ T.W.
A N7 C S 3960 Acres N A E District
23’
3canal
The combined stormwater surface area is 4660 acres.
2’
8,71
District
2
1400 Acres 3960 + 700 =
4660 Acres Drainage Area of Pump Station 7
Pump Station 2 pumps water over the Metarie Ridge to Pump Stations 3 and 7.
Perspective Sections - New design
N LEA
S
SEA
CONCEPT 160
’ VA
R.
A CAN
L
E. L
ee
Blv
d
+15’ T.W.
0 -8’ B.O. canal
EL
LEV
2’
8,71
PHASING MODELS: Wetland restoration in City Park
Total Capacity of Ponds ac ft
820 m / 0.51 mile
550 m / 0.34 mile
675 m / 0.42 mile
560 ac ft
111.7 ac x 6’-0”
670 ac ft
203.5 ac x 8’-0”
1628 ac ft
860 m / 0.53 mile
250 m / 820’
631 m / 0.39 mile
12.3 ac x 6’
74 ac ft 105.4 ac x 8’-0”
619 m / 0.38 mile
161.1 ac x 10’-0”
1,611 ac ft
200 m / 656’
428 ac ft
543 m / 0.34 mile
71.3 ac x 6’-0”
461 m / 0.29 mile
93.3 ac x 6’-0”
440 m / 0.27 mile
785 m / 0.49 mile
930 m / 0.58 mile
1,072 m / 0.67 mile
30 m 100’
Ponds & Marshes: 5814 Ponds: 1658 ac ft
1,038 m / 0.64 mile
843 ac ft
PHASING SECTIONS: Tree growth, water uptake, groundwater recharge Filmore Swamp
Mirabeau Swamp
1345 ac ft total capacity
2171 ac ft total capacity
Harrison Swamp
2298 ac ft total capacity
FILMORE SWAMP: 5-75 years Scale 1:3000
Tree eS Species: pec Black Willow, Bald Cypress, Water Tupelo, Red Maple, Elder Berry, Water Oak, Red Mulberry, Wax Myrtle
5 years
25 years
75 years
65% planting @ 600-680 seedlings per acre = 30,000 trees Potentially 75 ac ft daily water uptake, approx. 18% of pond capacity
Black Willows (young) - Water uptake 1,250 gallons / day Baldcypress (young) - Water uptake 440 gallons / day
Thinning of vegetative cover to 400-425 trees per acre = 20,000 trees Water uptake increases as trees grow
Potentially 103 ac ft water uptake, approx. 24% of pond capacity
Black Willows (mature) - Water uptake 2,500 gallons / day Baldcypress (mature) - Water uptake 880 gallons / day
Lakeview flipbooks - three sections
Sectional model of Bayou St. John