V1 = 90 ft x 285 sf x 7.48 gpcf x l fill

1) Estimate surface area of dual-cell

V1 = 191862 gal (726198L)

sediment basin

L x W x 2 = 150 ft x 50 ft x 2 =

15,000 sf

V2 = Bath weir overflow rate x (wash

2) Estimate surface area of equalization

period + clean up)

basin

L x W = 300 ft x 300 ft - 90,000 sf

V2 = Q2 x Tw = 960 gpm x 240 min

3) Estimate surface area of sand filters

V2 = 230400 gal (872064L)

L x W=300 ft x 150 ft = 45,000 sf

4) Estimate surface area of washwater

supply basin

V3 = Wash station flow rate x wash period

L x W = 300 ft x 300 ft = 90,000 sf

V3 = Q3 x Tw = 720 gpm x 180 min

Then: Q10 = C x I x AB/143560 sfpA

Q10 = 1.0 x 2.0 x 240,000 sf/

V3 = 129600 gal (490536L)

43560 sfpA

Q10 =

11 cfs or 4937 gpm

(18686 Lpm)

V4 = trench flush flow rate x cleanup

period

V4 = Q4 x K = 75 gpm x 60 min

Using equation 6-5, calculate the sedi-

V4 = 4500 gal (17032L)

ment basin overflow rate during the

washing period. The designer assumes

that the entrance preparation area trench

flusher, represented by Q4, and the bath

V5 = bath flusher flow rate x cleanup

flushers, represented by Q5, are not in

period

operation after the bath is filled and,

therefore these values are not used in the

V5

Q5 x k = 3000 gpm x 60 min

calculation. Apply the appropriate usage

factor at each flow source. Then,

V5 = l80000 gal (681300L)

Qover = U2Q2 + U3Q3 + U6Q6 + U7Q7

Qover = 0.90 (960 gpm) + 0.80 (720

gpm) + 0.20 (225 gpm) +

V6 = trench flusher flow rate x (wash

0.30)(120 gpm)

period + clean-up)

Qover = 1581 gpm (5984 Lpm)

V6 = Q6 x Tt = 225 gpm x 240 min

(4) *Volumes. *Using equations defined in chapter 6,

the designer computes the various component

V6 = 54000 gal (204390 L)

volumes for the following selected average

daily conditions:

Clean-up period, K

60 min

V7 = Interior wash flow rate x wash period

Daily wash period, Tw

180 min

V7 = Q7 x T = l2 gpm x l80 min

2

Total Wash and clean -up T

240 min

V7 = 21600 ga1 (81756L)

Storm Duration, Ts

60 min

one bath fill/flush per wash period.

V8 = yard hydrant flow rate x cleanup

period

Then, V1 = Bath volume x Number of fills

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