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Storage/Hydraulics

The table below depicts the hydraulic profile of my water treatment plant. The various elevations are listed (in feet) with respect to the philadelphia city datum. The datum is defined as zero elevation and is 5.5 feet lower than our intake at the river. The storage capacities are listed in MG (million gallons)..The residence (detention) times are listed in either hours, or minutes, and are noted in the table.

The theoretical time for complete processing of potable water (@ an average of 65 M.G.D.) is ~ 34 hours for the High Service District, and 39 hours for the Gravity Distribution District.

Storage Location
Capacity (Mgal)
Residence Time (Avg)
Primary Sedimentation
72 Mgal
22 Hrs
Rapid Mix
N/Applicable
1 min
Floc/Sedimentation Basin

North
6.0 Mgal
4-5 hrs
South
8.0 Mgal
4-5 hrs
Rapid Sand Filters

North
0.7 Mgal
20-30 mins
South
0.8 Mgal
20-30 mins
Weir Chamber
N/A
Clearwell
1.8 Mgal
35 mins
Filtered Water Basins
5.0 Mgal
30 mins
Monument Road Reservior
16.8 Mgal
4-6 hrs



The above detention times are mearly an average based on a rate of 65 MGD. Rate & Detention Time are inversely proportional to each other. Therefore, as the rate increases, the detention times decrease. As the rate decreases, the detention times increase.

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