SANITATION & DRAINAGE

Vulnerable age

Related hazards

Persons aged under 5 years

Domestic hygiene

HHSRS VERSION 2

Multiple locations

Yes

No

Secondary hazards

Yes

No

Front elevation

A) Detail of joint between waste pipe & soil pipe

Fit photo to lines}

DESCRIPTION OF HAZARDS

Dwelling: First floor flat in 1900, 3-

storey terraced house.

A) Rear yard

{Fit photo to lines]

Background - The house has been converted into flats. Work is currently in progress to complete

the first floor front flat. The four completed flats are self-contained, each with a combined bathroom

and wc and separate kitchen.

Soil pipe: The soil and vent pipe serving the first floor back addition bathroom is leaking at the joint

between the pipe and the waste pipe from the ground floor back addition bathroom. In addition, the

drain, which runs directly to the main sewer, appears to be partially blocked causing foul and waste

water to back-up and leak out onto the common rear yard.

A)

LIST OF RELEVANT MATTERS

LIKELIHOOD & OUTCOMES

A

# Secondary hazards

A

a

Soil and waste pipe provision

2

-

None

-

b

Pipe defects

3

c

Traps and water seals

-

d

Ventilation of pipes

-

e

Disrepair to system

3

f

Private sewage systems

-

Key

3

Seriously defective

g

Soakaway

-

2

Defective

h

Surface water drainage

-

1

Not satisfactory

I

Recycling system

-

-

Satisfactory/NA

HHSRS VERSION 2

SEPTEMBER 2004

Improved

A B C D E F G H

I

Average likelihood, outcomes and HHSRS score for hazards associated with inadequate

sanitation for persons aged under 5 years in pre 1920 HMOs, 1997-99

Score

29

HHSRS VERSION 2

SEPTEMBER 2004

HEALTH AND SAFETY RATING SYSTEM SCORES

Pre 1920 converted s/c Flats

LIKELIHOOD

Low

High

Average: 5,790

< 4200 2400 1300 750 420 240 130

75

42

24

13

1 in

6

Example

6

7.5

4

2.5

1.5 >

Justification

OUTCOMES

Class I

Class II

Class III

Class IV

Justification

RATING

Although there have been recent works to the house, including alterations and additions

to the drainage system, the main drains are still appropriate to a pre-1919 dwelling

occupied by a single family. Although the first floor flats are less likely to be affected than

the ground floor flats, the discharging of foul water on to the common yard means there

is a very high likelihood of an occurrence within the next twelve months.

%

Average: 0.0

0.0

< 0.05 0.15 0.3

0.7

1.5

3

7

15

26

38 >

Av: 2.0

2.2

< 0.05 0.15 0.3

0.7

1.5

3

7

15

26

38 >

Av: 22.0

21.5

< 0.05 0.15 0.3

0.7

1.5

3

7

15

26

38 >

Av: 76.0

76.3

< 0.05 0.15 0.3

0.7

1.5

3

7

15

26

38 >

Likelihood to

1 in 320

Outcomes to

0.0

2.2 21.5 76.3 %

The drains should be cleansed and, if necessary repaired. The joints to the soil and vent

pipe and between that pipe and the waste pipe should be properly sealed and made

watertight. This will reduce the likelihood but the rating will remain higher than average

due to the inadequately sized branch drain leading to the main sewer and the

consequent occasional risk of blockage.

0.0

2.2

21.5

76.3

While the likelihood has dramatically increased, there is nothing to suggest the outcomes

will have changed from the average.

Example

C

A B

Average: 2

D E F G H

I

J

1568

Score

RATING SCORES AFTER IMPROVEMENT

Av: 2

J

IMPROVE

Justification

NEW RATING

Av: Nos