Leach Bed Worksheet
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1Leach Bed Worksheet
FIXTURE COUNT CALCULATION CHART
TOTAL FIXTURE
FIXTURE TYPE
UNIT
# OF FIXTURES
UNITS
Bath Tub
2
X
=
Bidet
2
X
=
Clothes Washer
2
X
=
Dishwasher (separate from kitchen)
2
X
=
Lavatory (bathroom sink), single
1
X
=
Lavatory, double in master bedroom
1
X
=
Shower, single stall
2
X
=
Sink, bar
1
X
=
Sink, kitchen (including dishwasher)
2
X
=
Sink, service
3
X
=
Utility Tub or Sink
2
X
=
Water Closet (toilet), 1.6 GPF
3
X
=
Water Closet (toilet), >1.6 – 3.2 GPF
4
X
=
Water Closet (toilet), >3.2 GPF
6
X
=
TOTAL FIXTURE UNITS:
Items in BOLD are the most commonly used fixtures
Bedroom/Equivalent Worksheet
“Bedroom” means, for the purposes of determining design flow for an
on-site wastewater treatment facility for a dwelling, any room that has:
Room Type
Number of Rooms
a)
Floor space of at least 70 square feet in area, excluding
Bedroom
closets;
Den
b)
Ceiling height of at least 7 feet;
c)
Electrical service and ventilation;
Office
d)
A closet or an area where a closet could be constructed;
Other:
e)
At least one window capable of being opened and used for
Other:
emergency egress; and
f)
A method of entry and exit into the room which allows it to be
Other:
considered distinct from other rooms in the dwelling to afford
Total:
a level of privacy customarily expected for such a room.
TANK SIZE (from Septic System Sizing Chart)
=
Proposed Number of
Beds
DESIGN FLOW (from Septic System Sizing Chart)
=
Proposed Length of
PERCOLATION RATE
=
Bed
(from the Soils Report or Disposal Area Calculation Table)
SOIL ABSORPTION RATE
Proposed Width of
=
(from the Soils Report or Disposal Area Calculation Table)
Bed
TOTAL SQUARE FOOTAGE REQUIRED
=
Proposed Overall
(divide DESIGN FLOW by SAR or use Design Flow Calculation Table)
Depth of Bed
DIVISOR USED (see Example Calculations for detailed instructions)
=
Proposed Effective
TOTAL LINEAR LENGTH OF BED (divide TOTAL SQUARE FOOTAGE
Depth of Bed
=
by DIVISOR)
•
The maximum length for any disposal field is 100’. If the total linear length of the bed is greater than 100’, use a distribution box to divide the total
length into multiple beds of equal length to distribute the effluent more effectively throughout the disposal field.
•
The separation between piping in the bed is 4’ to 6’.
•
Additional inspection risers, placed along the sides of the bed, halfway between the other risers, are required for any bed greater than 50’ in length.
March 2016
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