Sump pit size calculations
Sump pit 01
**-Total no. of Garage drains in 2 Basements draining to this Sump pit = 5
**-Total no. of Floor drains in 2 Basements draining to this Sump pit = 2
-Total no. of Trench drains in 2 basements draining to this sump pit = 2 5
-Total no. of AC and firefighting drain in 2 basements draining to this sump pit = 5 5
- DFU (Drainage fixture unit) for Floor Drain = 2
- Assume DFU (Drainage fixture unit) for Trench drain & garage drain = 4 4
-Assume DFU (Drainage fixture unit) for AC drain & Firefighting drain = 1 1
-Total DFU (drainage fixture unit) = 2X2 + 7x4 +5x1 = 37
2 fd * 2 DFU + ( TD 2+GD 5) *4DFU + 5 AC&FFS *1 =37
5*4 + 5*1 =25
- Drainage discharge according to tables and demand load curves = 25 gpm
- Submersible pump design flow = 60 gpm
-Accordingly, The needed flow = 60 gpm = 0.227 m3/min
- Operation rate of pump 6 times per hour.
-Operation time = 5 min.
-Effective volume = flow x operation time = 0.227 x 5 = 1.135 m3
- Area of Sump Pit = 2 X 2= 4 m2
-Effective height = volume /area = 1.135/4 = 0.28 m
Total Pit height include: -
-Effective height = 0.3 m
- Height of wet volume (Water fixed in sump pit bottom) = 0.25 m
- Invert level of the incoming pipe based on the longest pipe run with slope = 0.7m
Total Sump pit Height = 0.3 + 0.25 + 0.7 + 0.5 = 1.75 m
- Height between the bottom of lowest drainage pipe & Switch on level = 0.5
8/10/202
3
Sump Pit Sizing Units
S.I
Britis
Input Data h
Height Between The Top of The
Slab & The Bottom of Lowest
Submersible Pump Minimum Time Sump Pit Sump Pit Height Between The Minimum Height of Water
Drainage Pipe Drained to The
Discharge Between Two Length Width Bottom of Lowest Drainage Required to Submerge The
Sump Pit
Successive Starts Pipe & The switch on Level Pump Discharge Pipe
3.78 Lps 0.70 m 3 Min. 2.00 m 2.00 m 0.50 m 0.25 m
Output Data
Minimum Storage
Storage
Volume for The
Height 0.7m
Sump Pit Lowest drainage Pipe Bottom
0.68 m3 0.35 m Level
Results 0.5m
1.8
Switch On Level
Sump Pit Height
0.35m
(The Height Between The Top of The Slab &
The Concrete Level of The Pit)
Switch Off
1.80 m Level
0.25m
2m X
2m
Sump pit 02
-Total no. of Garage drains in 2 Basements draining to this Sump pit = 3
-Total no. of Floor drains in 2 Basements draining to this Sump pit = 1
-Total no. of Trench drains in 2 basements draining to this sump pit = 3
-Total no. of AC drain in 2 basements draining to this sump pit = 3
- DFU (Drainage fixture unit) for Floor Drain = 2
- Assume DFU (drainage fixture unit) for Trench drain & garage drain = 4
-Assume DFU (Drainage fixture unit) for AC drain = 1
-Total DFU (drainage fixture unit) = 6x4 + 1x2 +3x1 = 29
- Drainage discharge according to tables and demand load curves = 20 gpm
- Submersible pump design flow = 60 gpm
-Accordingly, The needed flow = 60 gpm = 0.227 m3/min
- Operation rate of pump 6 times per hour.
-Operation time = 5 min.
-Effective volume = flow x operation time = 0.227 x 5 = 1.135 m3
- Area of Sump Pit = 2 X 2= 4 m2
-Effective height = volume /area = 1.135/4 = 0.28 m
Total Pit height include: -
-Effective height = 0.3 m
- Height of wet volume (Water fixed in sump pit bottom) = 0.25 m
- Invert level of the incoming pipe based on the longest pipe run with slope = 0.7m
(Additional height due to level difference in the basement = 0.45m)
- Height between the bottom of lowest drainage pipe & Switch on level = 0.95m
8/10/202
3
Sump Pit Sizing Units
S.I
British
Input Data
Height Between The Top of The Slab & The Bottom of Lowest Drainage Pipe Drained to The
Height
Sump
Between
Pit The Bottom of Lowest Drainage Pipe & The switch on Level
Submersible Pump Discharge Minimum Time Between
SumpTwo
Pit Successive
Length
Sump PitStarts
Width Minimum Height of Water Required to Submerge The Pump Discharge
3.15 Lps 0.70 m 1 Min. 2.00 m 2.00 m 0.95 m 0.25 m
Output Data
Minimum Storage
Storage
Volume for The
Height 0.7m
Sump Pit Lowest drainage Pipe Bottom Level
0.19 m3 0.35 m
0.95m
Results Switch On Level
2.25
Sump Pit Height 0.35m
(The Height Between The Top of The Slab &
The Concrete Level of The Pit)
Switch Off Level
2.25 m
0.25m
2m X 2m
Sump pit 03
-Total no. of Trench drains in 2 basements draining to this sump pit = 1
- Assume DFU (drainage fixture unit) for Trench drain & garage drain = 4
-Total DFU (drainage fixture unit) = 1x4 = 4
- Drainage discharge according to tables and demand load curves = 5 gpm
- Submersible pump design flow = 60 gpm
-Accordingly, The needed flow = 60 gpm = 0.227 m3/min
-Operation time = 3 min.
-Effective volume = flow x operation time = 0.227 x 3 = 0.68 m3
- Area of Sump Pit = 1.2 X 1.2= 1.44 m2
-Effective height = volume /area = 0.68/1.44 = 0.47 m
Total Pit height include: -
-Effective height = 0.47 m
- Height of wet volume (Water fixed in sump pit bottom) = 0.25 m
- Invert level of the incoming pipe based on the longest pipe run with slope = 2.25m
Total Sump pit Height = 0.47 + 0.25 + 2.25 = 2.97 m
8/10/202
3
Sump Pit Sizing Units
S.I
British
Input Data
Height Between The Top of The Slab & The Bottom of Lowest Drainage Pipe Drained to The Sump Pit
Submersible Pump Discharge Minimum Time Between
SumpTwo
Pit Successive
Length
Sump PitStarts
Width
Height Between The BottomMinimum
of LowestHeight
Drainage
of Water
Pipe &
Required
The switch
to Submerge
on Level The Pump Discharge
3.78 Lps 2.25 m 3 Min. 1.20 m 1.20 m m 0.25 m
Output Data
Minimum Storage
Storage
Volume for The
Height 2.25m
Sump Pit Lowest drainage Pipe Bottom Level
0.68 m3 0.47 m
Results
2.97
Switch On Level
Sump Pit Height
0.47m
(The Height Between The Top of The Slab &
The Concrete Level of The Pit)
Switch Off Level
2.97 m
0.25m
1.2m X 1.2m
8/10/202
3
