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Below Ground Drainage

Systems: UltraRibDesign Guide

CI/SfB(52.3) In6

July 2000 UR101

Uniclass EPICJR12 L21721 P7114 J344 X725

Intelligent Solutions for Below Ground Projects

FOR RESIDENTIAL,

COMMERCIAL AND

INDUSTRIAL APPLICATIONS

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O SMA ULTRARIB Page

In trod u ction 1-2

Pip e Te ch n ology an d Jo in t De sign 3

Material, The Osma UltraRib System,

Stan d ard s an d Acce p tan ce 4

Hydraulic Design -

Fou l an d Su r face Wate r Se we r 5-6

Stru ctu ra l De sign 7-11

Prote ction of Pip e s u n d e r Road s 12

Pip e Sizin g Tab le s 13-14

Stru ctu ra l De sign Tab le s 15-16

O s m a U l t r a R i b S y s t e m

Contents

O S M A U L T R A R I B D E S I G N M A N U A L

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Wavin is credited with inventing and pioneering

the use of plast ic pipe for water distribution and

for over twenty five years, has lea d th e way in the

deve lopment and produc t ion of unplas t ic ized

polyvinyl chlor ide (PVC-U) underground

drainage and sewerage systems.

Owned equally by the Overijsel Water Authority in Holland and CVC, the company has

grown spectacularly since i ts formation in 1955 and now employs over 4500 people

operat ing within 26 countries with a rapidly developing base in Central and Eastern

Europe.

Here in th e UK, ut i l ising the Osm a bran d n ame , Wavin Building Products has b ecome

marke t leader in both ab ove and be low ground dra inage . Over 500 people a re employed

on a 30 acre si te in Chippenham, Wiltshire , in design, manufacture and distribution.

The highly automated factory contains 35 microprocessor controlled inject ion

moulding machines manufacturing fi t t ings while 8 extrusion l ines produce pipe and

gutters. Wavin p rides i tself on th e q uali ty of these p rodu cts and the se rvices i t provides.

As a re sult, Wavin h as ach ieved BS EN ISO 9002 Registere d Firm Status a nd is the first in

the plast ic pipes industry to be accredited with BS 7750, the new Brit ish Standard for

environmen ta l management .

Wherever possible , Wavin ensures that i ts products are manufactured to a Bri t ish

Standard or , where no s tandard exis t s , the components a re independent ly assessed by

the British Board of Agrment.

In addition to supplying the highest

quali ty products, Wavin also offers

unrivalled service levels including an

extensive Computer Aided Design service

for specifiers. Sixteen workstations p rovide

drawings showing opt imum dra inage

layouts together with a detailed schedule

of components. This is a service which

Wavin continues to offer free to the

construction ind ustry.

PVC water p ipes

were developed b y

the Overijssel

Water Board in the

early 1950s.

The Osma

UltraRib system

received the

BSI Kitema rk

certification in

1995.

O S M A U L T R A R I B S Y S T E M

Int roduct ion


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1. INTRODUCTION

I t i s a w e l l k n o w n f a c t t h a t b u r i e d p i p e s u s e d f o r

t h e t r a n s p o r t a t i o n o f e i t h e r w a t e r o r s e w a g e ,

r e p r e s e n t s o n e o f t h e l a r g e s t i n f r a s t r u c t u r e

i n v e s t m e n t s f o r a u t i li t y o r l o c a l a u t h o r i t y.

O n c e i n s t a l l e d , t h e s e s y s t e m s a l s o r e p r e s e n t

a s i g n i f i c a n t a n n u a l c o s t i n t e r m s o f t h e i r

o p e r a t i o n a l a n d m a i n t e n a n c e a c t i v i t i e s .

Th e r e f o r e , g r e a t e ffo r t h a s a l w a ys b e e n m a d e t o

d e v e l o p t e c h n i c a l s y s t e m s w h i c h a r e

f i t - f o r - p u r p o s e .

T h e s u i t a b i l i t y o f a n y s y s t e m m a y t h e r e f o r e

b e e x p r e s s e d i n t e r m s o f t h e d e g r e e t o w h i c h

i t s f u n c t i o n a l r e q u i r e m e n t s a r e e x p e c t e d t o b e

f u l f i l l e d d u r i n g t h e t o t a l l i f e t i m e o f t h e s y s t e m .

T h e s e f u n c t i o n a l r e q u i r e m e n t s c o v e r a s p e c t s

s u c h a s t h e l o n g t e r m s t r e n g t h o f t h e p i p e

m a t e r i a l , i t s r e s i s t a n c e t o d e g r a d a t i o n a n d

b i o l o g i c a l a t t a c k p l u s t h e i n t e g r i t y o f t h e s y s t e m

i n t e r m s o f w a t e r t ig h t n e s s .

O n e m a j o r c o n s i d e r a t i o n f o r a n y e n g i n e e r

d e s i g n i n g a n y b u r i e d p i p e s y s t e m , b e i t r i g i d o r

f l e x i b l e , i s i t s s t r u c t u r a l d e s i g n . T h e s t r u c t u r a l

d e s i g n o f a p ip e c a n b e a f fe c t e d b y m a n y o u t s i d e

i n f l u e n c e s s u c h a s s o i l a n d t r a f f i c l o a d s , g r o u n d

c o n s o l i d a t i o n a n d w a t e r l e v e l s .

I n a d d i t i o n t o t h e a b o v e i n f l u e n c e s , f l e x i b l e

s y s t e m s m a n u f a c t u r e d f r o m m a t e r i a l s s u c h a s

P VC - U , w h i c h h a v e l im i t e d lo n g t e r m e x p e r i e n c e s

i n u s e , c o m p a r e d t o r i g id s y s t e m s a r e c o n s i d e r e d

h i g h - r i s k . T h e r e f o r e , t o c o m p e n s a t e , h i g h

f a c t o r s o f s a f e t y a r e i n c o r p o r a t e d i n t o t h e i r

s t r u c t u r a l d e s i g n c a lc u l a t i o n s .

H o w e v e r , o n t h e o t h e r h a n d , r i g i d s y s t e m s

w h i c h h a v e a c t u a l l o n g t e r m e x p e r i e n c e s a r e

c o n s i d e r e d s a f e a n d t h u s , r e l a t i v e l y l o w

f a c t o r s o f s a f e t y a r e u s e d b y e n g i n e e r s , s i n c e

a c c e p t e d l o n g t e r m e x p e r i e n c e s c a n a l w a y s b e

r e fe r r e d t o .

F l e x i b l e s y s t e m s m a n u f a c t u r e d f r o m P V C - U

h a v e b e e n i n c o m m o n u s e a s b u r i e d p i p e l i n e s

f o r m o r e t h a n 3 0 y e a r s , w i t h w e l l d o c u m e n t e d

r e s u l t s . H o w e v e r , t h e y h a v e s t i l l n o t r e a c h e d

t h e s a m e d e g r e e o f g e n e r a l a c c e p t a n c e a m o n g

e n g i n e e r s , c o m p a r e d t o r ig id m a t e r ia ls .

F r o m a t e c h n i c a l - s c i e n t i f i c p o i n t o f v i e w ,

f le x ib l e p i p e s h a v e b e e n t h e s u b j e c t o f s ig n i fi c a n t

r e s e a r c h a n d d e v e l o p m e n t w i t h i n m a j o r

i n s t i t u t i o n s w o r l d w i d e . A d d i t i o n a l l y , t h e i r

b e h a v i o u r p a t t e r n s i n s it u h a v e a l s o b e e n s t u d i e d

o v e r a n u m b e r o f y e a r s r e s u l t i n g i n a c l o s e

c o r r e la t io n o f t h e r e s u l t s b e t w e e n t h e t h e o r e t ic a l

a n d t h e p r a c t i c a l . F u r t h e r m o r e , b a s e d o n t h e

a b o v e r e s e a r c h i t c a n b e e s t a b l i s h e d t h a t f l e x i b l e

s y s t e m s c a n n o w o f f e r e n g i n e e r s a m i n i m u m

d e s i g n l i fe i n e x c e s s o f 5 0 y e a r s .

W i t h t h i s a s a b a c k g r o u n d i t s e e m s

u n s a t i s fa c t o r y fr o m b o t h a s o c i a l a n d e c o n o m ic a l

p o i n t o f vi e w , t h a t t h e u s e o f f le x ib l e s y s t e m s a r e

n o t a s w i d e s p r e a d a s t h e i r m e r i t s ju s t i f y.

T h e p l a s t i c i n d u s t r y i s a w a r e o f t h e f a c t t h a t

o n e r e a s o n w h y e n g i n e e r s a r e r e l u c t an t t o a c c e p t

t h e u s e o f f l e x i b l e s y s t e m s i s t h e a b s e n c e o f

a n a u t h o r i t a t i v e d o c u m e n t w h i c h c o v e r s t h e

s t r u c t u r a l d e s i g n o f t h e s y s t e m .

T h e p u r p o s e o f t h i s p u b l i c a t i o n i s t o t r y a n d

r e m e d y t h is b y d e t a i l in g w i t h in t h e f o ll o w i n g

s e c t i o n s a l l t h e n e c e s s a r y d e s i g n c r i t e r i a , re l a t in g

t o t h e d e s i g n a n d i n s t a l l a t i o n o f O s m a U l t r a R i b ,

w h i c h i s a s t r u c t u r e d w a l l , P VC - U , f le x ib l e s e w e r

s y s t e m .

O S M A U L T R A R I B S Y S T E M 2

Introduct ion Cont inued


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E xt e r n a l r e i n f o r c i n g r i b s g i v e

e x c e p t i o n a l a x i a l r i g id i t y

a n d r a d i a l s t r e n g t h

C o n c e n t r ic e x t e r n a l

r e i n f o r c i n g r i b s

E l a s t o m e r i c

S e a l i n g R i n g

I m p r o v e d h y d r a u l i c fl o w d u e t o t h e s m o o t h

i n t e r c h a n g e b e t w e e n p i p e a n d f i t t in g s

T h e u n i q u e U l t r a R i b h i g h p e r f o r m a n c e j o i n t

O S M A U L T R A R I B S Y S T E M3

Pipe Techno logy and Joint Design


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2. MATERIAL

T h e s t r e n g t h a n d p e r f o r m a n c e q u a l i t i e s o f P V C - U

h a v e b e e n s t u d i e d fo r a n u m b e r o f y e a r s t o a s s e s s

t h e m a t e r i a ls lo n g - t e r m c h a r a c t e r i s t ic s . Re s e a r c h

h a s p r o v e n i t s s u i t a b i l i t y f o r t h e

m a n u f a c t u r e o f l a r g e d i a m e t e r d r a i n a g e a n d

s e w e r a g e s y s t e m s , s i n c e i t b e c o m e s a n i n t ri n s ic

p a r t o f t h e g r o u n d d u r i n g s e t t l e m e n t . T h i s f a c t

p a v e d t h e w a y f o r a n e w d e v e l o p m e n t i n p i p e

t e c h n o l o g y , n o t o n l y i n t e r m s o f m a n u f a c t u r i n g

b u t a l s o i n t h e s t r u c t u r a l p r o p e r t i e s o f t h e p i p e

i t s e lf i .e . O s m a U l t r a Ri b .

3 . THE OSMA ULTRARIB SYSTEM

O s m a U l t r a Ri b is a f u ll y s o c k e t e d s y s t e m o f

p i p e a n d f i t t i n g s w h i c h c o m b i n e s s e c u r e j o i n t i n g

w i t h e a s e o f i n s t a l l a t i o n . T h e p i p e h a s a s m o o t h

i n n e r s u r f a c e a n d e x t e r n a l l y h a s a r e p e a t i n g

p a t t e r n o f c o n c e n t r i c r i b s w h i c h g i v e s t h e p i p e

i t s e x c e p t i o n a l a x i a l r i g i d i t y a n d e n h a n c e d r a d i a l

s t r e n g t h .

O s m a U l t r a Ri b p i p e a n d f it t i n g s a r e o f fe r e d i n

1 5 0 m m , 2 2 5 m m a n d 3 0 0 m m d i a m e t e r s . P i p e i s

m a n u f a c t u r e d t o W a t e r I n d u s t r y S p e c i f i c a t i o n

( W I S ) 4 - 3 1 - 0 5 a n d K i t e m a r k e d u n d e r t h e B S I

C e r t i fi c a t io n S c h e m e . A l l O s m a U l t r a Ri b f i tt i n g s

a r e c o v e r e d b y a B r i t i s h B o a r d o f A g r m e n t

C e r t i f i c a t e .

3 .1 Jo in t Des ign

O s m a U l t r aRi b jo i n t s a r e m a d e b y p l a c in g t h e

s e a l i n g r i n g b e t w e e n t h e s e c o n d a n d t h i r d

e x t e r n a l r e i n fo r c i n g r ib s n e a r e s t t h e s p i g o t e n d o f

t h e p i p e , w h i c h i s t h e n i n s e r t e d i n t o a s o c k e t .

T h e r e s u l t i s a h i g h p e r f o r m a n c e , w a t e r - t i g h t

jo in t w it h t w o a d d e d b e n e fi t s :

N o c h a m f e r i n g o f t h e p i p e e n d s .

Ring d i sp laceme nt d ur ing ins ta l la t ion i s impo ss ib le .

3 . 2 Fi t t i n g De sig n

T h e m a jo r ity o f O s m a U l t r a Rib f it t i n g s a re s o c k e te d

t o p r o v i d e t o t a l f l e x i b i l i t y i n u s e a n d t o r e d u c e

i n s t a l la t i o n t i m e o n s i t e . Ea c h O s m a U l t r a Ri b

c o m p o n e n t h a s c o n c e n t r i c , e x t e r n a l r e i n f o r c i n g

r ib s t h r o u g h o u t i t s b o d y s e c t io n . T h e s o c k e t s o f

t h e c o m p o n e n t s a r e s p e c i a l l y d e s i g n e d t o a l l o w

t h e p i p e a n d s o c k e t o f t h e fi tt in g t o m o v e a s o n e

s h o u l d d i ff e r e n t i a l s e t t l e m e n t o c c u r .

4. STANDARDS

4 . 1 Br i t i sh St a n d a rd s I n st i t u t i o n

O s m a U l t ra Rib p i p e c o m p l ie s w i th t h e f o l lo w i n g

r e q u i r e m e n t s a n d i s Ki te m a r k e d :

W IS 4 -3 1 -0 5 - Sp e c ific at io n fo r So lid W a ll

( 19 9 1 Is s u e 2) C o n ce n t ric Ext e rn a l Rib -

Re i n f o r c e d u P VC S e w e r P i p e .

4 . 2 Br i t i sh Bo a rd o f A g r m e n t

O s m a U l t r a R i b s y s t e m s h a v e b e e n a w a r d e d t h e

fo l lo w in g c e r t i f i c a t e s :

9 8 /3 47 2 - U lt r a Rib G r a v it y Se w er Sys t e m

- 1 50 m m , 2 2 5m m a n d 3 0 0 m m

9 1 /5 8 - Ro a d s a n d Br id g e sU l t r a Ri b G r a v i t y D r a i n a g e a n d

S e w e r a g e Sy s t e m - 1 5 0 m m

8 9 /4 6 - R o a d s a n d Br id g e s U lt r a Rib

G r a v i t y S e w e r a g e S y s t e m -

2 2 5 / 3 0 0 m m

5. ACCEPTANCE

O s m a U l t r a Ri b s y s t e m s a r e i n c l u d e d i n t h e f o l-

l o w i n g p u b l i c a t i o n s : -

S e w e rs f o r Ad o p t io n , 4 t h Ed i tio n , u n d e r i ts

g e n e r i c n a m e S o l i d W a l l , C o n c e n t r i c E x t e r n a l

R ib - R e i n f o r c e d u P VC S e w e r P i p e .

C i vil En g i n e e r in g S p e c if ic a t io n f o r t h e W a t e r

I n d u s t r y , u n d e r i t s g e n e r i c n a m e S o l i d W a l l ,

C o n c e n t r i c E x t e r n a l R i b - R e i n f o r c e d u P V C

S e w e r P i p e .

S p e cific a tio n f o r H i gh w a y W o r k s , se r ie s 5 0 0

D r a i n a g e a n d S e r v i c e D u c t s .

S ta n d a r d Sp e c ific a tio n f o r W a t e r a n d Se w e r a g e

S c h e m e s , Th i r d Ed i t io n u n d e r i t s g e n e r i c n a m e

S o l i d W a l l , C o n c e n t r i c E x t e r n a l R i b -

R e in f o r c e d u P VC S e w e r P i p e .


Mat er ial, The Osma Ult raRib System , St andards and Accept ance


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P r o p o r t i o n a l d e pt hs , v e l o c it i e s a n d d i s c h a r g e g r a p h

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Proportionaldepth

P r o p o r t i o n a l ve l o c i t y a n d d i s c h a r g e

0 . 8 1

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V e l o c i t y( V )

D

d

P r o p o r t i o n a l d e p t h = d

D


Hydraulic Design


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6. HYDRAULIC DESIGN-FOUL WATER SEWER

R e c o m m e n d a t i o n s a s l a i d o u t i n S e w e r s f o r

A d o p t i o n 4 t h E d i t i o n c o v e r i n g t h e h y d r a u l i c

d e s i g n o f f o u l s e w e r s a r e a s f o l l o w s :

6 .1 F low Rat es

Residen t ia l Deve lopm ent s

T h e d e s i g n f l o w s f o r g r a v i t y s e w e r s s h o u l d b e

4 0 0 0 l / u n i t d w e l li n g / d a y.

I n d u s t r i a l a n d Co m m e rc ia l D eve lo p m e n t

D e s i g n f lo w i n c lu d i n g d o m e s t i c e le m e n t , s h o u l d

b e a g r e e d a f t e r d i s c u s s i o n w i t h t h e U n d e r t a k e r /

C o u n c i l .

6 .2 Ve loc i t y

T o p r o v i d e a s e l f - c l e a n s i n g r e g i m e w i t h i n f o u l

g r a v i t y s e w e r s , t h e m i n i m u m v e l o c i t y s h o u l d

b e 0 . 7 5 m / s e c a t o n e - t h i r d d e s i g n f l o w . T h i s

r e q u i r e m e n t w i l l b e d e e m e d t o b e s a t i s f i e d b y a

1 5 0 m m n o m i n a l i n t e r n a l d i a m e t e r g r a v it y s e w e r

h a v i n g a g r a d i e n t n o t f l a t t e r t h a n 1 i n 1 5 0 a n d

a t l e a s t 1 0 c o n n e c t e d d w e l li n g u n i ts .

T h e s e d e e m e d t o s a t i s f y p a r a m e t e r s a r e n o t

t o b e t a k e n a s a n o r m w h e n t h e t o p o g r a p h y

p e r m i t s s t e e p e r g r a d i e n t s . H y d r a u l i c s t u d i e s

i n d i c a t e t h a t t h e s e r e q u i r e m e n t s d o n o t

n e c e s s a r i l y a c h i e v e a s e l f - c l e a n s i n g r e g i m e .

W h e n a c h o i c e h a s t o b e m a d e b e t w e e n g r a v i t y

s e w e r a g e a n d p u m p e d s e w e r a g e t h e s e c r i t e r i a

s h o u l d n o t b e r e g a r d e d a s i n f l e x i b l e a n d t h e

D e v e l o p e r s h o u l d c o n s u l t t h e U n d e r t a k e r /

C o u n c i l .

6.3 Roughness Value ks

T h e r o u g h n e s s v a l u e f o r f o u l g r a vi t y s e w e r d e s i g n

s h o u ld b e 1 . 5 m m .

7. HYDRAULIC DESIGN - SURFACE WATER

SEWER

R e c o m m e n d a t i o n s a s l a i d o u t i n S e w e r s f o r

A d o p t i o n 4 t h E d i t i o n c o v e r i n g t h e h y d r a u l i c

d e s i g n o f s u r f a c e w a t e r s e w e r s a r e a s f o l l o w s :

7 .1 Design M et hod

T h e a p p r o p r i a t e m e t h o d i n t h e W a l l i n g f o r d

P r o c e d u r e s h o u l d b e u s e d u n l e s s o t h e r w i s e

a g r e e d w i t h t h e U n d e r t a k e r / C o u n c i l e . g . i n t h e

c a s e o f s m a l l d e v e lo p m e n t s .

7 .2 Ve loc i t y

Th e m in i m u m v e lo c i ty s h o u l d b e 1 m / s e c a t p i p e

fu l l f low.

7.3 Roughness Value ks

T h e r o u g h n e s s v a l u e f o r s u r f a c e w a t e r s e w e r

d e s ig n s h o u ld b e 0 . 6 m m .

7 .4 Flow Rat es

T h e f l o w r a t e s c o n t a i n e d i n t h e s i z i n g t a b l e s

( s e e Ta b l e 1 p a g e s 1 3 a n d 1 4 ) fo r O s m a U l t r a Ri b

p ip e s fr o m 1 5 0 m m t o 3 0 0 m m d ia m e t e r a r e b a s e d

o n t h e C o l e b r o o k W h i t e f o r m u l a e x p r e s s e d i n t h e

f o r m o f :

k s + 2 .5 1 v

V = - 2 ( 2 g D S )Lo g 10

3 . 7 D D 2 g D S

V = Ve lo cit y (m /s )

g = G ra vit at io n a l a cc e le ra tio n ( m /s2

)

D = In te rn a l d ia m e t er o f p ip e (m )

S = H yd ra u lic g r a d ie n t

k s = Ro u gh n es s va lu e (m )

v = Kin e m a tic v is co s it y o f flu id

1 . 3 x 1 0 -6 (m 2/ s )


Hydr aulic Design - Foul and Sur f ace Water Sew er


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8. STRUCTURAL DESIGN

T h i s s e c t i o n i s e x t e n s i v e l y b a s e d o n t h e W a t e r

R e s e a r c h C e n t r e s E n g i n e e r i n g R e p o r t E R 2 0 1 E

G u i d e t o t h e W a t e r I n d u s t r y f o r t h e S t r u c t u r a l

D e s i g n o f U n d e r g r o u n d N o n - P r e s s u r e P V C - U

P i p e l in e s a n d W I S 4 - 3 1 - 0 5 .

8 .1 Design Pr inc ip les

O s m a U l t r a Ri b d e r i v e s it s l o a d b e a r i n g c a p a c i t y

f r o m i t s b e d d i n g a n d s i d e f i l l m a t e r i a l . U n d e r s o i l

a n d s u p e r i m p o s e d l o a d i n g , t h e p i p e w i ll d e f o r m

v e r t i c a ll y a n d h o r i z o n t a l l y d e v e l o p i n g t h e p a s s i v e

s u p p o r t o f s i d e f i l l . C o n s e q u e n t l y t h e d e s i g n o f

a n y O s m a U l t r a R i b p i p e l i n e m u s t t a k e i n t o

a c c o u n t t h e i n t e r a c t io n b e t w e e n t h e p i p e a n d i ts

b e d d i n g a n d s i d e f il l m a t e r i a l.

A s t h e s o i l a n d p i p e i n t e r a c t i o n t a k e s p l a c e ,

d e f o r m a t i o n o c c u r s . T h e p r e s e n t U n i te d Ki n g d o m

W a t e r I n d u s t r y l o n g - t e r m d e f o r m a t i o n l i m i t f o r

P V C - U p i p e l i n e s i s 6 % o f t h e v e r t i c a l n o m i n a l

d i a m e t e r o f t h e p i p e u n d e r c o n s i d e r a t i o n .

P r a c t i c a l e x p e r i e n c e s h o w s t h a t a n y i n c r e a s e i n

d e f o r m a t i o n a f t e r a p e r i o d o f t w o y e a r s w i l l b e

n e g l i g i b l e f o r a p i p e l i n e i n s t a l l e d i n a c c o r d a n c e

w i t h t h i s g u i d e .

8 . 2 De f o r m a t i o n Ca l cu lat i o n s

Th e l o n g t e r m d e f o r m a t i o n o f P VC - U p i p e s u n d e r

l o a d m a y t y p i c a l l y b e c a l c u l a t e d u s i n g t h e

S p a n g l e r l o w a f o r m u l a w h i c h t a k e s t h e f o r m :

D e f o r m a t i o n Ve r tic a l lo a d o n p ip e

P ip e s t iffn e s s t e rm + s o il s t iffn e s s t e rm

More spec i f ica l ly the long te rm deformat ion i s g iven by :

L

=(D

LP

o+ P

t) K

x

(8 SL) + ( 0 . 0 6 1 E' )

W h e r e

L is th e lo n g te rm (50 ye ars ) vert ical d efo rm atio n m

P o i s t h e v e r t ic a l s o i l l o a d o n t h e p i p e N / m

P t i s t h e t r a ff ic l o a d o n t h e p i p e N / m

Kx

i s a b e d d i n g c o n s t a n t ( d i m e n s i o n l e s s )

SL i s t h e l o n g t e r m s t i ff n e s s o f t h e p i p e N / m 2

E' i s t h e m o d u l u s o f s o i l r e a c t io n N / m 2

D L i s t h e d e f le c t i o n l a g f a c t o r ( d i m e n s i o n l e s s )

Th e d e f o r m a t i o n a s a p e r c e n t a g e i s g i ve n b y :

x 1 0 0

D

W h e r e

is t h e d e fo rm a t io n a t a n y t im e m

D is t h e m e a n d ia m e te r o f th e p ip e m

A n e x p l a n a t i o n o f t h e v a r i o u s t e r m s u s e d i n t h e

d e f o r m a t i o n e q u a t io n s i s g iv e n b e l o w :

L T h e d e f o r m a t i o n i s t h e c h a n g e i n t h e v e r t i c a l

m e a n d i a m e t e r o f t h e p ip e .

D Th e m e a n p i p e d ia m e t e rs a re

N o m in a l M e a n

P ip e D ia m et e r P ip e D ia m et e r

0 .1 5 0 m 0 .1 6 1 m

0 .2 2 5 m 0 .2 3 8 m

0 .3 0 0 m 0 .3 1 7 m

D L T h e d e f l e c t i o n l a g f a c t o r i s a v a r i a b l e

d i m e n s i o n l e s s f a c t o r w h i c h t a k e s a c c o u n t o f

l o n g t e r m s e t t l e m e n t o f t h e b e d d i n g a n d

b a c k f il l. It i s r e c o m m e n d e d t h a t a v a lu e o f n o t

l e s s t h a n 1 . 5 b e g i v e n t o D L f o r m o s t n o r m a l

c i r c u m s t a n c e s w h e r e g r a n u l a r m a t e r i a l i s

s p e c i f i e d f o r t h e p i p e b e d d i n g a n d p i p e z o n e

b a c k f il l. T h i s i s a c o n s e r v a t i v e v a l u e f o r m o s t

i n s t a l l a t i o n s a n d t h i s v a l u e h a s b e e n g e n e r a l l y

a d o p t e d a f t e r b e i n g s h o w n t o h a v e w i d e

va l id i ty .

P o Th e v e r t i ca l lo a d o n t h e c r o w n o f t h e p i p e d u e

t o b e d d i n g a n d b a c k f i l l m a t e r i a l i s n o r m a l l y

c a l c u l a t e d b y m e a n s o f t h e s i m p l e

r e l a t i o n s h i p ;

P o = g H B c

W h e r e :

i s the sa tu ra ted bu lk dens i ty o f the backf il l kg /m3

H is t h e de p th of c o ve r o ve r t h e p ip e m

Bc

is t h e o u ts id e d ia m et e r o f t h e p ip e m

(re fe r to Tab le 3 , page 15) .

g is t h e gr a vita t io n a l c o n s ta n t 9.8 1m /s2


Structural Design


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V a lu e s o f P o a re g iv e n in T a b le 3 fo r v a r io u s

s i z e s o f p i p e s a n d d e p t h s o f c o v e r . T a b l e 3

a s s u m e s a v a lu e f o r o f 2 , 0 0 0 k g / m 3 a n d t h i s

s h o u l d b e u s e d u n l e s s a p p r o p r i a t e a l te r n a t iv e

v a l u e s h a v e b e e n o b t a i n e d b y s i t e t e s t i n g . I t

w i l l b e r e c o g n i s e d t h a t t h e e q u a t i o n g i v e s t h e

w e i g h t o f t h e c o l u m n o f s o i l a b o v e t h e p l a n

a r e a o f t h e p i p e . T h e s o i l c o l u m n a p p r o a c h i s

g e n e r a l l y r e c o g n i s e d a s g i v i n g t h e m o s t

c o n s e r v a t i v e e s t i m a t e o f s o i l l o a d s a c t i n g o n

b u r i e d f le x ib l e p i p e s . Th e c o n c e p t o f w i d e a n d

n a r r o w t r e n c h e s a s a p p l ie d t o r i g id p i p e d e s i g n

h a s n o t b e e n a d o p t e d i n t h i s g u id e , w h i ch i s in

l i n e w i t h t h e a p p r o a c h a d o p t e d i n E R 2 0 1 E .

P t T ra f f i c l o a d s o n b u r i e d p ip e s a re g iv e n in T a b le

3 . T h e y a r e d e r i v e d f r o m t a b l e s u s e d f o r t h e

s t r u c t u r a l d e s i g n o f r i g i d p i p e s . I t h a s b e e n

s u g g e s t e d t h a t f l e x i b l e p i p e s m a y b e l e s s

a f fe c t e d b y p a s s i n g t r a ff ic t h a n r i g id p i p e s b u t

a s y e t t h e r e i s i n s u f fi c ie n t e v id e n c e t o a l lo w a

r e d u c t i o n i n t h e v a lu e s g i ve n i n Ta b l e 3 .

Kx Th e b e d d i n g c o n s t a n t r e fl e c t s t h e q u a l it y o f t h e

b e d d i n g a n d h e n c e t h e a m o u n t o f s u p p o r t g iv e n

t o t h e p i p e . A r a n g e o f v a l u e s w a s d e t e r m i n e d

t h e o r e t i c a l l y b y S p a n g l e r b u t i s n o w c u s t o m a r y

t o u s e a n o m in a l v a lu e f o r Kx o f 0 .1 0 3 .

S L T h e l o n g t e r m s t i f f n e s s . T h e n o m i n a l 5 0 y e a r

s t i ff n e s s o f O s m a U l t r a Ri b p i p e s h a l l b e n o t

l e s s t h a n 3 . 0 k N / m 2 . A s p e r t e s t t y p e

r e q u i r e m e n t s s t a t e d i n W I S 4 -3 1 - 0 5 .

E' Th e m o d u l u s o f s o i l r e a c t io n b r o a d l y re f le c t s

t h e q u a l i t y o f t h e m a t e r i a l u s e d f o r t h e p i p e

b e d d i n g a n d t h e e f fe c t iv e n e s s o f c o m p a c t io n .

Re c o m m e n d e d v a l u e s f o r E' a r e g iv e n i n Ta b l e

2 . Va l u e s o f E' h a v e b e e n d e d u c e d e m p i r ic a l ly

a n d c a n n o t b e o b t a in e d b y d i r e c t m e a s u r e m e n t .

8 .3 Def o rma t i on Ca l c u l a t i ons - wo rk ed

example

T h e e x p e c t e d l o n g t e r m d e f o r m a t i o n f o r O s m a

U l t r a R i b p i p e s a t d e p t h s o f c o v e r b e t w e e n 1 . 2

m e t r e s a n d 1 0 m e t r e s c a n b e r e a d d i r e c t l y f r o m

T a b l e 4 , p a g e 1 6 . B e l o w i s a w o r k e d e x a m p l e

s h o w i n g t h e m e t h o d o f c a l c u l a t i o n t h a t t h e

r e s u l t s i n Ta b l e 4 w e r e d e r i ve d f r o m :

- O s m a U lt ra Rib P ip e n o m i n al d ia m e t e r 2 25 m m

- C ove r D e p th 3 .5 m

- M a in Ro ad Lo ad in g

- S o il Bu lk D e n s it y 2 , 0 0 0 kg /m 3

- Be d d in g M a te ria l - G ra d ed G ra ve l - C o m p ac te d

L =(D L P o + P t) Kx

(8 SL ) + ( 0. 06 1 E')

W h e r e

D L = 1 . 5

P o = g H B c

= 2 0 0 0 x 9 .8 1 x 3 .5 x 0 . 25

= 1 7 , 16 8 N / m ( 1 7. 2 kN / m o r r e fe r t o Ta b le 3 )

P t = 5 .3 kN /m (fr om Ta b le 3 )

Kx = 0 . 1 0 3

S L = 3 .0 k N /m2

E' = 1 0 M N/m 2 ( 1 0 , 0 0 0 k N / m 2)

L =( 1 . 5 x 1 7 . 2 + 5 . 3 ) 0 . 1 0 3

( 8 x 3 ) + ( 0 . 0 6 1 x 1 0 , 0 0 0 )

=3 1 . 1 x 0 . 1 0 3

2 4 + 6 1 0

=3 . 2 0 3 3

6 3 4

= 0 .0 0 5 05 m

T o c a l c u l a t e % d e f o r m a t i o n d i v i d e b y t h e m e a n

p i p e d i a m e t e r ( D ) a n d m u l t ip l y b y 1 0 0 .

=0 . 0 0 5 0 5

x 1 0 00 . 2 3 8

= 2 . 1 2 %

T h e r e f o r e t h e lo n g t e r m d e f o r m a t i o n fo r t h e a b o v e

e x a m p l e w o u l d b e 2 . 1 2 % .


St ruct ural Design cont inued


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Time-deformation curve

Interaction b etween pipe, bedding and sidefill

0

1 ye a r 2 y e a rs

Tim e af ter ins ta l l a t ion

Pipe

deform

ation

5 0 y e a r s

S e t t l em en td e fo rm a t i o n

Main backf i l l zone

In i t ia l b ackf i ll zo ne

D N + 3 0 0

Pt Pt Pt

Po

Sidefi l l zone

B ed d i n g zo n e1 0 0 m m

1 5 0 m m

H

Ins tal l a t iond e fo rm a t i o n




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8 .4 Buck l i ng Ca lcu la t ions

T h e p u r p o s e o f c a r r yi n g o u t b u c k l in g c a l c u l a t io n s

i s t o e n s u r e t h a t t h e c r i t i c a l b u c k l i n g p r e s s u r e

(Pcr ) fo r a b u r ie d p i p e e x c e e d s t h e a c t u a l i m p o s e d

b u c k l i n g p r e s s u r e ( Pb) b y a n a d e q u a t e m a r g i n . I t

i s r e c o m m e n d e d t h a t a f a ct o r o f s a fe t y o f 2 .5 b e

a d o p t e d . T h e i m p o s e d b u c k l i n g p r e s s u r e ( Pb) is

d e t e r m in e d b y c o n s i d e r in g t h e n e t e x t e r n a l lo a d s

o n t h e p i p e .

Pb =P o + P t

Bc

T h e c r i t i c a l b u c k l i n g p r e s s u r e i s g i v e n b y t h e

f o l l o w i n g f o r m u l a w h i c h t a k e s a c c o u n t o f t h e

m o d u l u s o f s o i l r e a c t io n a n d t h e l o n g t e r m p i p e

s t i f fn e s s :

P cr = 3 2 E' S L

T h i s i s u s u a l l y m o d i f i e d b y t h e i n t r o d u c t i o n o f a

r e d u c t i o n f a c t o r Rd . T h i s r ecogn i se s t ha t a s t he p ipe

i s d e f o r m e d t h e c r i t ic a l b u c k li n g p r e s s u r e r e d u c e s .

W i t h i n t h e d e f o r m a t i o n l i m i t s r e c o m m e n d e d i n

th i s gu ide a r e l a t i onsh ip o f t he fo l l ow ing fo rm i s

n o r m a l ly c o n s i d e r e d v a l id :

Rd = 1 3 L

D

T h u s

P cr = Rd 3 2 E' SL

I n t r o d u c i n g t h e f a c t o r o f s a f e t y a g a i n s t b u c k l i n g

l e a d s t o t h e f o r m u l a:

P cr 2 .5

P b

8 . 5 Bu c k l i n g Ca l c u l a t i o n s - w o r k e d

examp le .

T h e b u c k l i n g c a lc u l a t io n s s a f e t y fa c t o r f o r O s m a

U l t ra Ri b p i p e s a t d e p t h s o f c o v e r b e t w e e n 1 . 2 m

a n d 1 0 m c a n b e r e a d d i r e c t l y f r o m t a b l e 4 o n

p a g e 1 6 . B e l o w i s a w o r k e d e x a m p l e s h o w i n g t h e

m e t h o d o f c a l c u l a t i n g t h e r e s u l t s s h o w n i n t a b l e

4 .

I n s t a l l a t i o n a s p e r d e f o r m a t i o n c a l c u l a t i o n s

w o r k e d e x a m p l e :

P b =P o + P t

Bc

=1 7 .2 + 5 .3

0 . 2 5

= 9 0 kN /m 2

Rd = 1 3 L

D

= 1 (3 x 0 .0 2 1 2 )

= 0 .9 3 64

P cr = Rd 3 2 E' S L

= 0 .9 3 64 3 2 x 1 0 , 0 0 0 x 3

= 9 1 7 .5 k N /m 2

P cr =9 1 7 . 5

= 1 0 . 1 9P b 9 0 . 0

T h e c r i t i c a l b u c k l i n g p r e s s u r e ( P cr ) i s 1 0 . 1 9

t im e s g r e a t e r t h a n t h e i m p o s e d b u c k li n g p r e s s u r e

a n d e x ce e d s t h e m i n im u m s a fe t y fa c t o r o f 2 . 5 .

O S M A U L T R A R I B S Y S T E M 1 0



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D N = N o m in a l d ia m e te r

= Ve r t ic a l d e f o r m a t io n

Osma UltraRibs unique design restricts deformation under loads

DN

DN

L

LM ax i m u m U K d e fo rm a t i o n 6 %




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9.0 PROTECTION OF PIPES UNDER ROADS

T h e f o l l o w i n g r e c o m m e n d a t i o n s a s l a i d d o w n i n

S e w e rs F o r A d o p t io n , 4 th E d i t io n , C la u s e s 2 . 7 ,

4 . 3 . 4 , 4 . 5 . 2 , 4 . 5 . 3 a n d 4 . 5 . 4 s h o u l d b e f o l l o w e d .

T h e fo l lo w in g a re e x t r a c t s f ro m s e l e c t e d c l a u s e s

t a k e n f r o m S e w e r s f o r A d o p t i o n - 4 t h e d i t i o n .

P l e a s e r e f e r t o t h e d o c u m e n t f o r t h e f u l l

r e c o m m e n d a t i o n .

9.1 Dept hs of Sew er s - Clause 2.7

S e w e r s l a i d w i t h i n h i g h w a y s s h o u l d h a v e a

m i n im u m c o ve r o f 1 .2 m m e a s u r e d f ro m t h e t o p

o f t h e p i p e b a r r e l t o t h e f in i s h e d r o a d s u r f a c e , in

o r d e r t o a v o i d i n t e r f e r e n c e w i t h o t h e r

u n d e r g r o u n d u t i li ty p i p e s a n d c a b l e s . W h e r e t h i s

i s n o t p r a c t i c a b l e , s p e c i a l p r o t e c t i v e m e a s u r e s

m a y b e r e q u i r e d . T h e d e s i g n o f t h e p i p e l i n e

s h o u l d t a k e a c c o u n t o f lo a d i n g fr o m t h e p a s s a g e

o f t h e D e v e l o p e r s c o n s t r u c t i o n p l a n t a s w e l l a s

n o r m a l d e s i g n l o a d i n g .

9.2 Backf i l l ing - C lause 4.3.4

F i l l i n g m a t e r i a l s h a l l b e d e p o s i t e d i n l a y e r s n o t

e x c e e d in g 2 2 5 m m u n c o n s o l i d a t e d t h ic k n e s s , a n d

t h e n f u l l y c o m p a c t e d t o f o r m a s t a b l e b a c k f i l l .

W h e r e t h e e x c a v a ti o n i s w it h i n 1 m o f t h e e d g e o f

t h e c a r r i a g e w a y, o r p r o p o s e d c a r r i a g e w a y , t h e f i ll

m a t e r i a l s h a l l b e s u c h a s t o p e r m i t a d e q u a t e

d r a i n a g e . W h e r e t h e e x c a v a t i o n s h a v e b e e n

s u p p o r t e d a n d t h e s u p p o r t s a r e t o b e r e m o v e d ,

t h e s e , w h e r e p r a c t i c a b l e , s h a l l b e w i t h d r a w n

p r o g r e s s i v e l y a s b a c k f i l l i n g p r o c e e d s i n s u c h a

m a n n e r a s t o m i n im i s e t h e d a n g e r o f c o ll ap s e a n d

a l l v o i d s f o r m e d b e h i n d t h e s u p p o r t s s h a l l b e

c a r e f u l ly fi ll e d a n d c o m p a c t e d .

9.3 Pipe Beddi ng - Clause 4.5.2

B e d d i n g f o r p i p e s s h a l l b e c o n s t r u c t e d b y

s p r e a d i n g a n d c o m p a c t i n g gr a n u l a r b e d d i n g m a t e -

r i a l o v e r t h e f u l l w i d t h o f t h e p i p e t r e n c h . A f t e r

t h e p i p e s h a v e b e e n l a i d , a d d i t i o n a l g r a n u l a r

m a t e r i a l s h a l l , i f r e q u i r e d , b e p l a c e d a n d

c o m p a c t e d e q u a l l y o n e a c h s i d e o f t h e p i p e s a n d

w h e r e p r a c t ic a b l e , th i s s h a l l b e d o n e in s e q u e n c e

w i t h t h e r e m o v a l o f th e t r e n c h s u p p o r t s .

9 . 4 Co n c re t e Pro t e ct i o n t o Pip e s - Cla u se

4.5.3

C o n c r e t e p r o v i d e d a s a p r o t e c t io n t o p i p e s s h a l l

b e G r a d e C 2 0 p la c e d t o t h e r e q u i r e d d e p t h i n o n e

o p e r a t i o n . W h e r e p i p e s w i t h f l e x i b l e j o i n t s a r e

u s e d , c o n c r e t e p r o t e c t i o n s h a l l b e i n t e r r u p t e d

o v e r i t s f u l l c r o s s - s e c t i o n a t e a c h p i p e j o i n t b y a

s h a p e d c o m p r e s s i b le f il le r .

W h e r e p i p e s a r e p r o t e c t e d b y a c o n c r e t e

c o v e r s l a b p l a c e d a b o v e t h e p i p e t h i s s h a l l e x t e n d

a c r o s s t h e f u l l w i d t h o f t h e t r e n c h a n d t h e r e s h a l l

b e a m i n i m u m o f 1 5 0 m m o f s u r r o u n d b e t w e e n

t h e c r o w n o f t h e p i p e a n d u n d e r s i d e o f t h e s la b .

9 .5 Comple t ion o f Pipe Sur r ound - Clause

4.5.4

A f t e r c o m p l e t i o n o f t h e r e l e v a n t o p e r a t i o n s i n

C lauses 4 . 5 . 1 , 4 . 5 . 2 and 4 . 5 . 3 , f i l l m a t e r i a l sha l l ,

w h e r e r e q u i r e d , b e p l a c e d a n d c o m p a c t e d o v e r

t h e f u l l w i d t h o f t h e t r e n c h i n l a y e r s n o t e x c e e d i n g

1 5 0 m m b e f o r e c o m p a c t io n , t o a fin i s h e d t h i c kn e s s

o f 2 5 0 m m a b o v e t h e c r o w n o f t h e p ip e s .

S u b s e q u e n t b a c k f il li n g s h a l l t h e n b e c a r r ie d o u t

a s s p e c i fi e d i n C l a u s e 4 . 3 . 4 .


Prot ection of Pipes under Roads


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Table 1. Osma UltraRib Pipe Sizing Tables

Size 150 Size 225 Size 300

Mean Bore 151.8m m Mean Bore 225.6m m Mean Bore 300.2m m

k values in m m k values in m m k values in m m

Gradien t 0.60 1.50 0.60 1.50 0.06 1.50

1 : 1 0 l/s 5 8 . 4 2 1 5 0 . 7 2 4 1 6 6 . 5 8 7 1 4 5 . 7 8 2 3 5 3 . 9 0 9 3 1 1 . 3 1 7

m /s 3 . 2 2 8 2 . 8 0 3 4 . 1 6 7 3 . 6 4 7 5 . 0 0 0 4 . 3 9 8

1 : 2 0 l/s 4 1 . 2 3 2 3 5 . 8 3 5 1 1 7 . 6 2 1 1 0 3 . 0 1 3 2 4 9 . 9 4 2 2 2 0 . 0 0 9

m /s 2 . 2 7 8 1 . 9 8 0 2 . 9 4 2 2 . 5 7 7 3 . 5 3 1 3 . 1 0 8

1 : 3 0 l/s 3 3 . 6 1 7 2 9 . 2 3 9 9 5 . 9 2 9 8 4 . 0 6 5 2 0 3 . 8 8 4 1 7 9 . 5 5 8

m /s 1 . 8 5 7 1 . 6 1 6 2 . 4 0 0 2 . 1 0 3 2 . 8 8 1 2 . 5 3 7

1 : 4 0 l/s 2 9 . 0 7 8 2 5 . 3 0 7 8 2 . 9 9 9 7 2 . 7 7 0 1 7 6 . 4 3 0 1 5 5 . 4 4 4

m /s 1 . 6 0 7 1 . 3 9 8 2 . 0 7 6 1 . 8 2 0 2 . 4 9 3 2 . 1 9 6

1 : 5 0 l/s 2 5 . 9 8 1 2 2 . 6 2 4 7 4 . 1 7 5 6 5 . 0 6 2 1 5 7 . 6 9 4 1 3 8 . 9 8 9

m /s 1 . 4 3 6 1 . 2 5 0 1 . 8 5 6 1 . 6 2 8 2 . 2 2 8 1 . 9 6 4

1 : 5 5 l/s 2 4 . 7 6 0 2 1 . 5 6 6 7 0 . 6 9 6 6 2 . 0 2 3 1 5 0 . 3 0 7 1 3 2 . 5 0 1

m /s 1 . 3 6 8 1 . 1 9 2 1 . 7 6 9 1 . 5 5 2 2 . 1 2 4 1 . 8 7 2

1 : 6 0 l/s 2 3 . 6 9 5 2 0 . 6 4 4 6 7 . 6 6 2 5 9 . 3 7 3 1 4 3 . 8 6 5 1 2 6 . 8 4 2

m /s 1 . 3 0 9 1 . 1 4 1 1 . 6 9 3 1 . 4 8 5 2 . 0 3 3 1 . 7 9 2

1 : 6 5 l/s 2 2 . 7 5 5 1 9 . 8 2 9 6 4 . 9 8 5 5 7 . 0 3 4 1 3 8 . 1 8 0 1 2 1 . 8 4 9

m /s 1 . 2 5 7 1 . 0 9 6 1 . 6 2 6 1 . 4 2 7 1 . 9 5 2 1 . 7 2 2

1 : 7 0 l/s 2 1 . 9 1 8 1 9 . 1 0 4 6 2 . 6 0 0 5 4 . 9 5 1 1 3 3 . 1 7 7 1 1 7 . 4 0 1

m /s 1 . 2 1 1 1 . 0 5 6 1 . 5 6 6 1 . 3 7 5 1 . 8 8 1 1 . 6 5 9

1 : 7 5 l/s 2 1 . 1 6 6 1 8 . 4 5 3 6 0 . 4 5 8 5 3 . 0 7 9 1 2 8 . 5 6 8 1 1 3 . 4 0 6

m /s 1 . 1 7 0 1 . 0 2 0 1 . 5 2 1 1 . 3 2 8 1 . 8 1 6 1 . 6 0 2

1 : 8 0 l/s 2 0 . 4 8 6 1 7 . 8 6 3 5 8 . 5 2 0 5 1 . 3 8 6 1 2 4 . 4 5 3 1 0 9 . 7 9 1

m /s 1 . 1 3 2 0 . 9 8 7 1 . 4 6 4 1 . 2 8 6 1 . 7 5 8 1 . 5 5 1

1 : 8 5 l/s 1 9 . 8 6 7 1 7 . 3 2 7 5 6 . 7 5 6 4 9 . 8 4 5 1 2 0 . 7 0 7 1 0 6 . 5 0 1

m /s 1 . 0 9 8 0 . 9 5 7 1 . 4 2 0 1 . 2 4 7 1 . 7 0 5 1 . 5 0 5

1 : 9 0 l/s 1 9 . 3 0 0 1 6 . 8 3 6 5 5 . 1 4 1 4 8 . 4 3 4 1 1 7 . 2 7 7 1 0 3 . 4 8 8

m /s 1 . 0 6 6 0 . 9 3 0 1 . 3 7 9 1 . 2 1 2 1 . 6 5 7 1 . 4 6 2

1 : 9 5 l/s 1 8 . 7 7 8 1 6 . 3 8 4 5 3 . 6 5 5 4 7 . 1 3 6 1 1 4 . 1 2 2 1 0 0 . 7 1 7

m /s 1 . 0 3 8 0 . 9 0 5 1 . 3 4 2 1 . 1 7 9 1 . 6 1 2 1 . 4 2 3

1 : 1 0 0 l/s 1 8 . 2 9 7 1 5 . 9 6 6 5 2 . 2 8 2 4 5 . 9 3 6 1 1 1 . 2 0 7 9 8 . 1 5 6

m /s 1 . 0 1 1 0 . 8 8 2 1 . 3 0 8 1 . 1 4 9 1 . 5 7 1 1 . 3 8 7

1 : 1 0 5 l/s 1 7 . 8 5 0 1 5 . 5 7 9 5 1 . 0 0 8 4 4 . 8 2 3 1 0 8 . 5 0 3 9 5 . 7 8 0

m /s 0 . 9 8 6 0 . 8 6 1 1 . 2 7 6 1 . 1 2 1 1 . 5 3 3 1 . 3 5 3

1 : 1 1 0 l/s 1 7 . 4 3 3 1 5 . 2 1 8 4 9 . 8 2 3 4 3 . 7 8 7 1 0 5 . 9 8 5 9 3 . 5 6 8

m /s 0 . 9 6 3 0 . 8 4 1 1 . 2 4 6 1 . 0 9 5 1 . 4 9 7 1 . 3 2 2

1 : 1 1 5 l/s 1 7 . 0 4 5 1 4 . 8 8 1 4 8 . 7 1 5 4 2 . 8 2 0 1 0 3 . 6 3 3 9 1 . 5 0 2

m /s 0 . 9 4 2 0 . 8 2 2 1 . 2 1 9 1 . 0 7 1 1 . 4 6 4 1 . 2 9 3

1 : 1 2 0 l/s 1 6 . 6 8 1 1 4 . 5 6 6 4 7 . 6 7 8 4 1 . 9 1 3 1 0 1 . 4 3 0 8 9 . 5 6 7

m /s 0 . 9 2 2 0 . 8 0 5 1 . 1 9 3 1 . 0 4 9 1 . 4 3 3 1 . 2 6 5

1 : 1 2 5 l/s 1 6 . 3 3 8 1 4 . 2 6 9 4 6 . 7 0 3 4 1 . 0 6 2 9 9 . 3 6 0 8 7 . 7 4 9

m /s 0 . 9 0 3 0 . 7 8 8 1 . 1 6 8 1 . 0 2 7 1 . 4 0 4 1 . 2 4 0

1 : 1 3 0 l/s 1 6 . 0 1 6 1 3 . 9 9 0 4 5 . 7 8 5 4 0 . 2 6 0 9 7 . 4 1 1 8 6 . 0 3 6

m /s 0 . 8 8 5 0 . 7 7 3 1 . 1 4 5 1 . 0 0 7 1 . 3 7 6 1 . 2 1 6

1 : 1 3 5 : l/s 1 5 . 7 1 2 1 3 . 7 2 7 4 4 . 9 1 9 3 9 . 5 0 3 9 5 . 5 7 2 8 4 . 4 2 0

m /s 0 . 8 6 8 0 . 7 5 8 1 . 1 2 4 0 . 9 8 8 1 . 3 5 0 1 . 1 9 3

1 : 1 4 0 l/s 1 5 . 4 2 5 1 3 . 4 7 7 4 4 . 0 9 9 3 8 . 7 8 7 9 3 . 8 3 1 8 2 . 8 9 2

m /s 0 . 8 5 2 0 . 7 4 5 1 . 1 0 3 0 . 9 7 0 1 . 3 2 6 1 . 1 7 1

1 : 1 4 5 l/s 1 5 . 1 5 2 1 3 . 2 4 1 4 3 . 3 2 3 3 8 . 1 0 8 9 2 . 1 8 2 8 1 . 4 4 3

m /s 0 . 8 3 7 0 . 7 3 2 1 . 0 8 4 0 . 9 5 3 1 . 3 0 2 1 . 1 5 1

1 : 1 5 0 l/s 1 4 . 8 9 3 1 3 . 0 1 7 4 2 . 5 8 5 3 7 . 4 6 3 9 0 . 6 1 6 8 0 . 0 6 7

m /s 0 . 8 2 3 0 . 7 1 9 1 . 0 6 5 0 . 9 3 7 1 . 2 8 0 1 . 1 3 1

1 : 1 5 5 l/s 1 4 . 6 4 7 1 2 . 8 0 4 4 1 . 8 8 4 3 6 . 8 5 0 8 9 . 1 2 6 7 8 . 7 5 8

m /s 0 . 8 0 9 0 . 7 0 7 1 . 0 4 8 0 . 9 2 2 1 . 2 5 9 1 . 1 1 3


Pipe Sizing Tables


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Table 1 . O sma UltraRib Pipe Sizing Tables continued

Size 150 Size 225 Size 300

Mean Bore 151.8mm Mean Bore 225.6m m Mean Bore 300.2m m

k values in m m k values in mm k values in m m

Grad ient 0.60 1.50 0.60 1.50 0.60 1.50

1 : 1 6 0 l/s 1 4 . 4 1 3 1 2 . 6 0 0 4 1 . 2 1 5 3 6 . 2 6 6 8 7 . 7 0 7 7 7 . 5 1 1

m /s 0 . 7 9 6 0 . 6 9 6 1 . 0 3 1 0 . 9 0 7 1 . 2 3 9 1 . 0 9 5

1 : 1 6 5 l/s 1 4 . 1 8 9 1 2 . 4 0 6 4 0 . 5 7 7 3 5 . 7 0 9 8 6 . 3 5 3 7 6 . 3 2 1

m /s 0 . 7 8 4 0 . 6 8 5 1 . 0 1 5 0 . 8 9 3 1 . 2 2 0 1 . 0 7 8

1 : 1 7 0 l/s 1 3 . 9 7 5 1 2 . 2 2 1 3 9 . 9 6 8 3 5 . 1 7 6 8 5 . 0 5 9 7 5 . 1 8 4

m /s 0 . 7 7 2 0 . 6 7 5 1 . 0 0 0 0 . 8 8 0 1 . 2 0 2 1 . 0 6 2

1 : 1 7 5 l/s 1 3 . 7 7 0 1 2 . 0 4 3 3 9 . 3 8 5 3 4 . 6 6 7 8 3 . 8 2 0 7 4 . 0 9 6

m /s 0 . 7 6 1 0 . 6 6 5 0 . 9 8 5 0 . 8 6 7 1 . 1 8 4 1 . 0 4 7

1 : 1 8 0 l/s 1 3 . 5 7 4 1 1 . 8 7 4 3 8 . 8 2 6 3 4 . 1 7 9 8 2 . 6 3 4 7 3 . 0 5 4

m /s 0 . 7 5 0 0 . 6 5 6 0 . 9 7 1 0 . 8 5 5 1 . 1 6 7 1 . 0 3 2

1 : 1 8 5 l/s 1 3 . 3 8 6 1 1 . 7 1 1 3 8 . 2 9 1 3 3 . 7 1 1 8 1 . 4 9 6 7 2 . 0 5 4

m /s 0 . 7 4 0 0 . 6 4 7 0 . 9 5 8 0 . 8 4 3 1 . 1 5 1 1 . 0 1 8

1 : 1 9 0 l/s 1 3 . 2 0 6 1 1 . 5 5 4 3 7 . 7 7 6 3 3 . 2 6 1 8 0 . 4 0 4 7 1 . 0 9 4

m /s 0 . 7 3 0 0 . 6 3 8 0 . 9 4 5 0 . 8 3 2 1 . 1 3 6 1 . 0 0 4

1 : 1 9 5 l/s 1 3 . 0 3 2 1 1 . 4 0 4 3 7 . 2 8 2 3 2 . 8 2 9 7 9 . 3 5 4 7 0 . 1 7 2

m /s 0 . 7 2 0 0 . 6 3 0 0 . 9 3 3 0 . 8 2 1 1 . 1 2 1 0 . 9 9 1

1 : 2 0 0 l/s 1 2 . 8 6 5 1 1 . 2 5 9 3 6 . 8 0 6 3 2 . 4 1 3 7 8 . 3 4 3 6 9 . 2 8 4

m /s 0 . 7 1 1 0 . 6 2 2 0 . 9 2 1 0 . 8 1 1 1 . 1 0 7 0 . 9 7 9

1 : 2 1 0 l/s 1 2 . 5 4 9 1 0 . 9 8 5 3 5 . 9 0 6 3 1 . 6 2 6 7 6 . 4 3 1 6 7 . 6 0 4

m /s 0 . 6 9 3 0 . 6 0 7 0 . 8 9 8 0 . 7 9 1 1 . 0 8 0 0 . 9 5 5

1 : 2 2 0 l/s 1 2 . 2 5 5 1 0 . 7 3 0 3 5 . 0 6 8 3 0 . 8 9 4 7 4 . 6 5 1 6 6 . 0 4 0

m /s 0 . 6 7 7 0 . 5 9 3 0 . 8 7 7 0 . 7 7 3 1 . 0 5 5 0 . 9 3 3

1 : 2 3 0 l/s 1 1 . 9 8 1 1 0 . 4 9 2 3 4 . 2 8 5 3 0 . 2 0 9 7 2 . 9 8 9 6 4 . 5 7 9

m /s 0 . 6 6 2 0 . 5 8 0 0 . 8 5 8 0 . 7 5 6 1 . 0 3 1 0 . 9 1 2

1 : 2 4 0 l/s 1 1 . 7 2 3 1 0 . 2 6 9 3 3 . 5 5 1 2 9 . 5 6 8 7 1 . 4 3 2 6 3 . 2 1 1

m /s 0 . 6 4 8 0 . 5 6 7 0 . 8 3 9 0 . 7 4 0 1 . 0 0 9 0 . 8 9 3

1 : 2 5 0 l/s 1 1 . 4 8 2 1 0 . 0 5 9 3 2 . 8 6 3 2 8 . 9 6 6 6 9 . 9 6 9 6 1 . 9 2 5

m /s 0 . 6 3 4 0 . 5 5 6 0 . 8 2 2 0 . 7 2 5 0 . 9 8 9 0 . 8 7 5

1 : 2 6 0 l/s 1 1 . 2 5 4 9 . 8 6 2 3 2 . 2 1 4 2 8 . 3 9 9 6 8 . 5 9 1 6 0 . 7 1 5

m /s 0 . 6 2 2 0 . 5 4 5 0 . 8 0 6 0 . 7 1 0 0 . 9 6 9 0 . 8 5 8

1 : 2 7 0 l/s 1 1 . 0 3 9 9 . 6 7 6 3 1 . 6 0 2 2 7 . 8 6 4 6 7 . 2 9 1 5 9 . 5 7 2

m /s 0 . 6 1 0 0 . 5 3 5 0 . 7 9 1 0 . 6 9 7 0 . 9 5 1 0 . 8 4 2

1 : 2 8 0 l/s 1 0 . 8 3 6 9 . 4 9 9 3 1 . 0 2 3 2 7 . 3 5 8 6 6 . 0 6 1 5 8 . 4 9 1

m /s 0 . 5 9 9 0 . 5 2 5 0 . 7 7 6 0 . 6 8 4 0 . 9 3 3 0 . 8 2 6

1 : 2 9 0 l/s 1 0 . 6 4 3 9 . 3 3 2 3 0 . 4 7 4 2 6 . 8 7 8 6 4 . 8 9 5 5 7 . 4 6 7

m /s 0 . 5 8 8 0 . 5 1 6 0 . 7 6 2 0 . 6 7 2 0 . 9 1 7 0 . 8 1 2

1 : 3 0 0 l/s 1 0 . 4 6 1 9 . 1 7 4 2 9 . 9 5 2 2 6 . 4 2 2 6 3 . 7 8 8 5 6 . 4 9 4

m /s 0 . 5 7 8 0 . 5 0 7 0 . 7 4 9 0 . 6 6 1 0 . 9 0 1 0 . 7 9 8

1 : 4 0 0 l/s 9 . 0 2 8 7 . 9 3 1 2 5 . 8 6 9 2 2 . 8 5 1 5 5 . 1 1 4 4 8 . 8 7 0

m /s 0 . 4 9 9 0 . 4 3 8 0 . 6 4 7 0 . 5 7 2 0 . 7 7 9 0 . 6 9 0

1 : 5 0 0 l/s 8 . 0 5 1 7 . 0 8 3 2 3 . 0 8 3 2 0 . 4 1 5 4 9 . 1 9 6 4 3 . 6 6 7

m /s 0 . 4 4 5 0 . 3 9 1 0 . 5 7 7 0 . 5 1 1 0 . 6 9 5 0 . 6 1 7

1 : 6 0 0 l/s 7 . 3 3 0 6 . 4 5 7 2 1 . 0 2 7 1 8 . 6 1 6 4 4 . 8 2 9 3 9 . 8 2 7

m /s 0 . 4 0 5 0 . 5 3 7 0 . 5 2 6 0 . 4 6 6 0 . 6 3 3 0 . 5 6 3

1 : 7 0 0 l/s 6 . 7 7 0 5 . 9 7 0 1 9 . 4 3 0 1 7 . 2 1 8 4 1 . 4 3 6 3 6 . 8 4 3

m /s 0 . 3 7 4 0 . 3 3 0 0 . 4 8 6 0 . 4 3 1 0 . 5 8 5 0 . 5 2 1

1 : 8 0 0 l/s 6 . 3 1 8 5 . 5 7 8 1 8 . 1 4 2 1 6 . 0 9 2 3 8 . 7 0 1 3 4 . 4 3 7

m /s 0 . 3 4 9 0 . 3 0 8 0 . 4 5 4 0 . 4 0 3 0 . 5 4 7 0 . 4 8 7

1 : 9 0 0 l/s 5 . 9 4 5 5 . 2 5 4 1 7 . 0 7 7 1 5 . 1 5 9 3 6 . 4 3 6 3 2 . 4 4 5

m /s 0 . 3 2 8 0 . 2 9 0 0 . 4 2 7 0 . 3 7 9 0 . 5 1 5 0 . 4 5 8

1 : 1 0 0 0 l/s 5 . 6 2 9 4 . 9 7 9 1 6 . 1 7 5 1 4 . 3 7 0 3 4 . 5 2 1 3 0 . 7 5 9

m /s 0 . 3 1 1 0 . 2 7 5 0 . 4 0 5 0 . 3 5 9 0 . 4 8 8 0 . 4 3 5


Pipe Sizing Tables continued


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N ot es

1 . Ta b l e 3 d e f in e s t h e v a lu e s o f t h e s o i l lo a d s , P o , fort h e v a r i o u s p i p e o u t s i d e d i a m e t e r s a n d d e p t h s o f

c o v e r u n d e r c o n s i d e r a t i o n i n t h i s G u i d e . A

s a t u r a t e d b u l k d e n s i t y v a l u e o f 2 0 0 0 k g / m3

is

a s s u m e d . S h o u l d t h e s i t e c o n d i t i o n s d i f f e r f r o m

t h i s , t h e n t h e v a l u e s g i v e n s h o u l d b e f a c t o r e d

accord ing ly .

2 . T ab l e 3 de f ines t he va lues o f t he t r a f f i c l oads , P t ,f o r o u t s i d e d i a m e t e r s a n d d e p t h s o f c o v e r u n d e r

c o n s i d e r a t i o n i n t h i s G u i d e . T h e s e v a l u e s h a v e

b e e n t a k e n f r o m A G u i d e t o D e s i g n L o a d i n g s f o r

Bu r i e d Ri gi d Pi p e s p r o d u c e d b y t h e D e p a r t m e n t o f

T ranspor t .

Table 3. Transm itted Loads t o Os ma UltraRib Pipe

Size O utside Type of Load Transmitted Load kN/m for Dep th in metres

Diame ter Bc Depth of

mm m m Cover (H) 0.9m 1.2m 1.5m 2.0m 2.5m 3.0m 3.5m 4.0m 4.5m 5.0m

1 5 0 1 7 0 So il (P o ) 3 .0 4 . 0 5 . 0 6 . 7 8 . 3 1 0 .0 1 1 . 7 1 3 . 3 1 5 .0 1 6 . 7

M a i n R d (P t) 1 4 .9 1 1 . 4 9 . 2 7 . 2 5 . 8 4 .6 4 . 0 3 . 4 2 .9 2 . 5

2 2 5 2 5 0 So il (P o ) 4 .4 5 . 9 7 . 4 9 . 9 1 2 . 3 1 4 .3 1 7 . 2 1 9 . 7 2 2 .1 2 4 . 6

M a i n R d (P t) 1 9 .8 1 5 . 1 1 2 . 1 9 .5 7 . 7 6 .2 5 . 3 4 . 5 3 .8 3 . 2

3 0 0 3 3 5 So il (P o ) 6 .0 7 . 9 9 . 9 1 3 . 2 1 6 . 5 1 9 .8 2 3 . 0 2 6 . 3 2 9 .6 3 7 . 9

M a i n R d (P t) 2 9 .3 2 7 . 3 1 8 . 3 1 4 .2 1 1 . 5 9 .2 7 . 9 6 . 6 5 .5 4 . 7

Depth of

Cove r (H) 5.5m 6.0m 6.5m 7.0m 7.5m 8.0m 8.5m 9.0m 9.5m 10.0m

1 5 0 1 7 0 So il (P o ) 1 8 .3 2 0 . 0 2 1 . 7 2 3 .3 2 5 . 0 2 6 .7 2 8 . 4 3 0 . 0 3 1 .7 3 3 . 4

M a i n R d (P t) 2 .0 1 . 8 1 . 6 1 . 4 1 . 2 1 .1 1 . 0 0 . 9 0 .8 0 . 7

2 2 5 2 5 0 So il (P o ) 2 7 .0 2 9 . 5 3 1 . 9 3 4 .4 3 6 . 8 3 9 .3 4 1 . 7 4 4 . 2 4 6 .4 4 9 . 1

M a i n R d (P t) 2 .7 2 . 4 2 . 1 1 . 8 1 . 6 1 .5 1 . 4 1 . 3 1 .2 1 . 1

3 0 0 3 3 5 So il (P o ) 3 6 .2 3 9 . 5 4 2 . 8 4 6 .0 4 9 . 3 5 2 .6 5 5 . 9 5 9 . 2 6 2 .5 6 5 . 8

M a i n R d (P t) 4 .0 3 . 5 3 . 0 2 . 7 2 . 3 2 .2 2 . 0 1 . 8 1 .6 1 . 4

Table 2. Typical Mod ulus Values

Typical modulus values for processed bedding and sidefill materials for use in flexible pipeline design.

MaterialModu lus of Soil React ion E'(MN/m 2)

Degree of compaction

D e s c r i p t i o nC a s a g r a n d e s y m b o l

U n c o m p a c t e d9 0 % M o d i f i e d P r o c t o r

Se e n o t e (b ) Se e n o t e ( a )

G ra ve l Sin g le -s iz e d G Pu 5 1 0

G ra ve l g ra d e d G W 3 1 0

Notes: ( a ) BS 1 3 7 7 , D e te r m in a t io n o f t h e d r y d e n s i ty /m o i s tu r e c o n te n t r e l a t i o n s h ip ( 4 .5 k g r a m m e r m e th o d ) , i s u s e d to d e t e r m in e th e M o d i fi e d P r o c to r D e n s i ty .

(b ) GPu Poor ly g raded un iform grave l GW Well g raded grave l


St ru ct ur al Design Tables


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T h e a b o v e t a b l e i s b a s e d o n t h e f o l l o w i n g

a s s u m p t i o n s .

a ) M a i n r o a d t r a ff ic l o a d in g i s e x p e c t e d .

b ) D e g r e e o f C o m p a c t io n = 9 0 % M o d ifi e d

P ro c to r , t h i s is g e n e ra l ly a c h ie v e d w i th 1 p a s s o f

a Me c h a n ic a l P la t e C o m p a c to r ( a s p e r Ta b le 5 o f

ER201E).

c ) S in g le s i z e d o r g r a d e d g r a v e l in a c c o r d a n c e

w i t h W I S 4 -0 8 - 0 1 1 9 9 4 : i ss u e 4 i s u s e d f o r p i p e

b e d & s u r r o u n d .

d ) Th e p i p e w o r k i s in s t a ll e d in a c c o r d a n c e w it h

t h e r e q u i r e m e n t s o f S e w e r s f o r A d o p t i o n 4 t h

Edi t ion .

D e f o r m a t i o n s h o u l d n o t e x c e e d 6 % .

B u c k lin g S a fe ty Fa c to r s h o u ld e x c e e d 2 . 5 .

Table 4. Pipe Deformation Table

150m m 225m m 300mm

DEPTH % BUCKLING % BUCKLING % BUCKLING

(m ) DEF. SAFETY FACTO R DEF. SAFETY FACTOR DEF. SAFETY FACTO R

1 . 2 1 . 7 5 1 0 .2 8 1 . 6 3 1 1 . 1 0 1 .7 5 1 0 . 2 9

1 . 3 1 . 7 3 1 0 .5 5 1 . 6 2 1 1 . 3 9 1 .7 3 1 0 . 5 4

1 . 4 1 . 7 1 1 0 .8 3 1 . 6 0 1 1 . 6 9 1 .7 1 1 0 . 8 0

1 . 5 1 . 6 9 1 1 .1 3 1 . 5 8 1 2 . 0 0 1 .6 9 1 1 . 0 8

1 . 6 1 . 7 0 1 1 .1 8 1 . 5 9 1 2 . 0 1 1 .7 0 1 1 . 1 4

1 . 7 1 . 7 1 1 1 .2 4 1 . 6 1 1 2 . 0 2 1 .7 0 1 1 . 3 2

1 . 8 1 . 7 2 1 1 .2 9 1 . 6 2 1 2 . 0 3 1 .7 2 1 1 . 2 6

1 . 9 1 . 7 3 1 1 .3 5 1 . 6 4 1 2 . 0 4 1 .7 3 1 1 . 3 2

2 1 . 7 4 1 1 .4 0 1 . 6 6 1 2 . 0 5 1 .7 4 1 1 . 3 8

2 . 2 5 1 . 7 9 1 1 .2 8 1 . 7 2 1 1 . 8 4 1 .7 9 1 1 . 2 5

2 . 5 1 . 8 4 1 1 .1 7 1 . 7 8 1 1 . 6 4 1 .8 5 1 1 . 1 2

2 . 7 5 1 . 9 1 1 0 .9 3 1 . 8 5 1 1 . 3 4 1 .9 2 1 0 . 8 8

3 1 . 9 8 1 0 .7 0 1 . 9 3 1 1 . 0 5 1 .9 9 1 0 . 6 6

3 . 2 5 2 . 0 8 1 0 .3 0 2 . 0 3 1 0 . 6 1 2 .0 8 1 0 . 2 8

3 . 5 2 . 1 7 9 .9 2 2 . 1 2 1 0 . 1 9 2 .1 7 9 . 9 3

3 . 7 5 2 . 2 7 9 .5 8 2 . 2 2 9 . 8 2 2 .2 6 9 . 6 0

4 2 . 3 6 9 .2 6 2 . 3 2 9 . 4 7 2 .3 6 9 . 2 9

4 . 5 2 . 5 6 8 .6 0 2 . 5 2 8 . 7 5 2 .5 6 8 . 6 3

5 2 . 7 8 7 .9 8 2 . 7 3 8 . 1 0 2 .7 7 8 . 0 1

5 . 5 2 . 9 8 7 .4 4 2 . 9 5 7 . 5 2 2 .9 8 7 . 4 4

6 3 . 2 2 6 .8 9 3 . 1 8 6 . 9 6 3 .2 1 6 . 9 1

6 . 5 3 . 4 5 6 .4 2 3 . 4 1 6 . 4 7 3 .4 4 6 . 4 4

7 3 . 6 8 5 .9 9 3 . 6 4 6 . 0 3 3 .6 7 6 . 0 0

7 . 5 3 . 9 1 5 .6 1 3 . 8 8 5 . 6 4 3 .9 1 5 . 6 1

8 4 . 1 5 5 .2 5 4 . 1 2 5 . 2 7 4 .1 5 5 . 2 5

8 . 5 4 . 3 9 4 .9 3 4 . 3 7 4 . 9 4 4 .3 9 4 . 9 3

9 4 . 6 4 4 .6 4 4 . 6 1 4 . 6 4 4 .6 4 4 . 6 4

9 . 5 4 . 8 8 4 .3 8 4 . 8 6 4 . 3 8 4 .8 8 4 . 3 8

1 0 5 . 1 2 4 . 1 4 5 . 1 0 4 . 1 4 5 .1 2 4 . 1 4


Structural Design Tables continued

O S M A U L T R A R I B P R O D U C T M A N U A L

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All OSMA systems are backed by fulltechnical literature and project support.

See inside back cover for details.

UR101

Wavin Plastics Limited

Parsonage Way

Chippenham

Wiltshire SN15 5PN

Tel: 01249 766600

Fax: 01249 443286

Email: [email protected]

Wavin Plastics Limited operates a programme of continuou s product development, and therefore reserves the right

to modify or amend the specification of their products without notice. All information in this publication is given in

good faith, and believed to be correct at the time of goin g to press. However, no responsibility can be accepted for

any errors, omissions or incorrect assumptions. Users should satisfy themselves that products are suitable for the

purpose and application intended.

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Meeting your needs

Below Ground Drainage systems, developed by Wavin Plastics Limited,

form part of a comprehensive range of systems to provide intelligent

solutions for all building, construction and utilities projects.

These include:

Above Ground Projects

OSMA Rainwater systems

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Plumbing & Heating Projects

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OSMA Pressure Pipes for Water

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All OSMA systems are backed by full

technical literature and project support.

www.wavin.co.uk

Design GuideBelow Ground Drainage

Systems: UltraRib

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