Completed worksheet for Design example 105Continued

Worksheet 10A-3—Anaerobic lagoon design—Continued

Lagoon sizing

Trial Bottom width no. ft (BW)

V must be equal to or greater than MLVR = 147770052 ft3

Bottom length ft (BL)

1000

* Depth must be adjusted in Step S1.

Depth adjustment

31. Depth adjustment Depth, ft (d)

Add depth of precipitation less evaporation on lagoon surface (for the treatment period)

Add depth of 25-year, 24-hour storm

Add for freeboard (1.0 foot minimum)

Final depth

32. Compute total volume using final depth, ft3 (use equation in step 30) -

Volume ft3 (V)

1,349,931

2

150

1200

8

1, B15,531

3

150

1100

8

1,482,731» MLVR

* Depth must be adjusted in Step S1.

2,014,299

/4xZxL/ + (Z xBL x d') + (Zx BWx d') + (BWx BL x d)

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