Flow Summary
System Characteristic
Q Pad
Q Weir
Error
Cumulative totals (Cubic meters)
969
17,684
34
Error (%)
0.18
Equivalence in mm of water/year
120
2,185
4
(corrected for 15 C).
No compaction of sludge layer (and associated decrease in hydraulic conductivity)
assumed.
Three-hour settling time between pumping and decanting over weir.
Remove 76.2 mm/hr from weir for first four hours (Hours 1215). Fifth hour (Hour
16) is a decanting drain.
Ref: Annual precipitation in Anchorage area ≈ 390 mm/yr.
7.3-m-long weir.
Key to Calculations
Equations used (See Day 8, Hour 3: Row 145).
Note: Column H corresponds to Q water (Pad), F to Thickness of Sludge, and G to
Height of Water Column
G144 + 37.8 (H145 1000/8090)
(Height of Water Column)
8090 3600 [(68 106)/1000] (152 + F144 + G144)/{152 + [F144 (68 106)/(15
104)]}
(Q water: Pad)
Equations used (See Day 8, Hour 13: Row 133).
Note: Column H corresponds to Q water (Pad), F to Thickness of Sludge, and G to
Height of Water Column
G149 (H150 + I150) 1000/8090
(Height of Water Column)
8090 3600 [(68 106)/1000] (152 + F149 + G149)/{152 + [F149 (68 106)/(15
104)]}
(Q water: Pad)
[
8.09 152 (G148 G149) 12 25.4 {1/[1.63 + 1/SQRT({6 [(G148 G149)/
]
25.4]}/12)]}2
(Q water: Weir)
8090
2-acre site size in square meters
Water in per 8-hr day @382 m3/hr.
2850
Sludge in per day (m3)
610
0.075
Sludge depth (m) per day, 2-acre site.
75.4
Sludge depth (mm) per day, 2-acre site.
302.4
Water depth (mm) per day, 2-acre site.
37.8
Water depth (mm) per hour, 2-acre site.
k = 15E(4) mm/sec
42
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