City Park Gets Swamped

Page 1

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


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Sectional model of Bayou St. John


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