99.535

99.630

99.705

99.985

99.173

99.100

99.727

99.300

99.550

99.625

99.745

99.755

1306

1307

1308

1318

1317

1315

1314

1313

13091312

1310

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13201321

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13241325

13261327

13281329

1330

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1338

1351

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1348

1343

1335

1337 1334 1333

1363

1364

1365

1366

1367

1369

1368

1376

Beech

BirchScots Pine

Birch

Beech

Birch

Scots Pine

Scots Pine

Oak

WillowBirch

Oak

Beech

Beech

Beech

BirchSycamore

SycamoreSycamore

Sycamore

Sycamore

Ash

BeechWillow

SycamoreSycamore

SycamoreSycamore

WillowWillow

Willow

Birch

Rowan

Willow

SycamoreWillow

Willow

SycamoreSycamore

Sycamore

Spruce

Birch

Lime

Hazel

Ash

Spruce

Soakaway

Soakaway

Klargester sewege

treatment system

to engineers

details + spec

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PPIC

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PLOT 3

PLOT 1

PLOT 2

R.E.

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R.E.

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R.E.

R.E.

R.E.

R.E.

FFL 100.000

FFL 99.750

FFL 100.200

5000

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100m

m pipe

2000ltr

underground

LPG storage tank

2000ltr

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LPG storage

tank

PPIC

2000ltr

underground

LPG storage

tank

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Proposed Foul

Water Soakaway

Area 150sqm

0

5.0

Scale Bar.

Soakaway test carried out in accordance with BS 6297 and reference to

British Water Code of Practice : Flows and Loads - 2.

Soakaway test concluded on 17 April 2018

Soil exposed was mainly firm to medium firm light brown sandy CLAY

with some gravel interspersed in undisturbed open field. Generic material

GLACIAL TILL

Average time to fall 250 mm determined as 165 min.

Vp = 165 x 60/250 = 39.6s/mm ... say 40 s/mm

Provision is for three dwellings, say 4 bedrooms, on the basis of usage by 4

persons. Biodisc primary treatment to be installed. Factor of 0.20 applies

PE = 5+ 1 per house = 6 person

For 3 no houses , PE exceeds 12 hence reduction due to balancing flow can

be applied .

Total PE provision = 18 x 0.9 = 16.2

Area of soakaway = 16.2 x 40 x 0.20 = 130 m2

ADOPT .... 12.0 x 12.5 metres as single size pit with embedded porous

pipes .. area provided 150 m 2 > 130 m2 required

Surface water soakaway notes :

Reference technical standards manual Section 3.6.5

Simplified formulae derived from BRE Digest 365

(A x 0.0145 ) - ( a x f x 900 ) = S

where A is the area to be drained in m2.

a = internal surface area of the soakaway to 50 % effective depth.

Assumed for initial purposes

f = soil infiltration rate m/s . = 1/Vp where Vp is determined

by site analysis or test. Ground condition known to be of some gravel

content.

Vp value of 40 sec/mm as used in foul analysis

Assume a soakaway area of 3 m x 1.5m as initial trial

S = required soakaway storage in m3.

Parameters in this case are as follows ;

A = 250 sq m including hardstanding

a = 3 x 1.5 x 0.5 = 2.25 m2

If Vp = 40 secs/mm , f = 1/40/1000 =0.000025

250 x 0.0145 = 3.63

2.25 x 0.000025 x 900 = 0.05 giving S = 3.63 - 0.05 = 3.58 m3

Adopt a pit of capacity 3 m x 1.5 m x 0.90 m deep below invert ie 4.05 m3

>> 3.58 m3 ) . Fill with clean dry stone , max size 50 mm

Note the areas provided are of irregular shape to use available space.

Gravel bed to be 20-75 mm

clean dry stone.

Geotextile wrap around

distribution layer

Heavy duty inspection pipe on tap root

225 mm dia max

Inspection chamber,

Balmoral or equal.Ground level

110mm dia.rigid UPVC drain for foul

waste laid to falls

KLARGESTER PRIMARY TREATMENT

PLANT

MIN PE = 18 or as specified by client.

NOTE : MINIMUM OF 900 mm to gravel bed for traffic load surcharge

Terram laid along

path of 110 rigid pipe.

Pea gravel bed and

surround to pipe

in 450 wide track.

TYPICAL PIPE TRACK.

Field/ top surface

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H.D. Inspection pipe on tap root

225 mm dia max

SOAKAWAY AREA PROVIDED = 150 m2

110mm dia.rigid UPVC drain for foul

waste laid to falls

H.D. Inspection pipe on tap root

225 mm dia max

Distribution layer of gravel bed , 300 mm

deep for embedded 110 mm dia slotted

pipework, pipes.

Geotextile laid over top and sides of gravel bed

Ground level

Approved road make up

over soakaway to comply

with Dp of T and Council

requirements. Minimum of

900 mm recommended

CONSULTING CIVIL & STRUCTURAL ENGINEERS23 FINTRY PLACE, BROUGHTY FERRY DUNDEE DD5 3BG

01382 737340

SINCLAIR ASSOCIATES

Scale

LJRH

7-06-18Date :

Job No : 4659

Title :

Project :

TEL

Drg No : D/01 Revision

sinclairstructures@gmail.com

Chartered Architects

Drainage Details 1

Proposed housing atKellieside, Milnathort

PROPOSED DRAINAGE LAYOUT

TYPICAL SECTION OF SOAKAWAY

SURFACE WATER SOAKAWAY

NOTIONAL LONG SECTION SOAKAWAY

FOUL SOAKAWAY SYSTEM