Plants

• Inlet and outlet structures

• Distribution systems

TABLE 6.21

Construction Costs of Free Water Wetlands, <1 mgd

TABLE 6.21

Construction Costs of Free Water Wetlands, <1 mgd

Design Flow

Area

Construction Cost

Location

(mgd)

(ac)

($/ac)a

Armour, South Dakota

0.1

4

31,091

Baltic, South Dakota

0.1

4

34,227

Cannon Beach, Oregon

0.68

16

49,089

Eureka, South Dakota

0.28

40

14,500

Ft. Washakie, Wyoming

0.18

1.6

61,827

Ft. Deposit, Alabama

0.24

14.8

32,906

Mays Chapel, Maryland

0.04

0.6

64,340

Mcintosh, Maryland

0.06

9.2

73,650

Ouray, Colorado

0.36

2.2

53,077

Tabor, South Dakota

0.065

2

31,768

Tripp, South Dakota

0.075

4

29,262

Vermontville, Michigan

0.1

11.4

116,860

Wakonda, South Dakota

0.05

2

26,024

Average

47,586

Median

26,024

a Costs are in 1998 dollars (Engineering News Record Construction Cost Index [ENR-CCI] = 5895).

a Costs are in 1998 dollars (Engineering News Record Construction Cost Index [ENR-CCI] = 5895).

Source: Crites, R.W. and Ogden, M., Costs of constructed wetlands systems, in Proceedings of WEFTEC 98, Water Environment Federation, Orlando, FL, October 3-7, 1998. With permission.

• Engineering, legal, contingencies, and contractor's overhead and profit

Summaries of technical and cost data for FWS constructed wetland systems are provided in Table 6.21, Table 6.22, and Table 6.23 (Crites and Ogden, 1998). The median construction cost for systems >1 mgd (3785 m3/d) was $14,465/ac, while the median cost for smaller systems was $34,227/ac.

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