ADD Planning Statement Re Drainage Dated

Proposed bungalows adjacent to No.4 Tennis Road, Douglas, Isle of Man Planning Statement Relating to Site Drainage December 2022

1. Executive Summary

1.1. The proposed surface water drainage system is outlined to have final discharge in to an existing public combined sewer.
1.2. The proposed surface water flows are proposed to be attenuated at an equivalent greenfield runoff rate of 7l/s/ha. This has been agreed with the Manx Utilities Authority.
1.3. The attenuation design accounts for the impermeable roof, paths and driveway areas.
1.4. Attenuation is to be incorporated independently on each plot utilising an underground storage tank.
1.5. The proposed foul drainage system is outlined to have final discharge in to an existing public combined sewer

2. Introduction

2.1. This statement has been prepared by BB Consulting Engineers in support of Planning Applications for the proposed development of 2No Bungalows adjacent to No. 4 Tennis Road, Douglas, Isle of Man. This statement covers the foul and surface water drainage.
2.2. This statement is to be read in conjunction with all other application documents relating to this application.

3. Site Description

3.1. The proposed development is outlined within the EnviroArchitecture drawings which relate to this application.
3.2. The proposed development area for each bungalow is 323m2.
3.3. The proposed impermeable area for each bungalow 230m2.

3.4. The proposed attenuation tank discharge rate for each bungalow is 0.2l/s and is derived from an equivalent greenfield run-off rate of 7l/s/ha as agreed with the MUA.

4. Foul Drainage

4.1. A foul drainage connection to an existing public sewer is available and this is the proposed mechanism for discharge.

5. Surface Water Drainage

5.1. A surface water drainage connection to an existing public sewer is available and this is the proposed mechanism for discharge.
5.2. The surface water flows exiting the site are to be attenuated.
5.3. Attenuation has been calculated at 10m3 for each bungalow and calculations are provided within Appendix A.

6. MAINTENANCE OF SURFACE WATER ASSETSAttenuation TankExtract from CIRIA C753 – SUDS Manual

Proposed bungalows adjacent to No.4 Tennis Road, Douglas, Isle of Man

Planning Statement Relating to Site Drainage

APPENDIX A

Attenuation Calculation – single bungalow

	B B C o n s u l n g E n g i n e ers Ltd 1 0 My rtl e Street, D o u g l a s I s l e o f Ma n , IM1 1 E D	F i l e : A e n ua o n .pfd Netw o r k : S t o r m Netw o r k Dav i d B erg i n 0 8 / 1 2 / 2 0 2 2	Page 1 2 2-1 3 1 Te n n i s Ro a d B u nga low s 1 0 m 3 A e n ua o n Ta n k s
N o d e s N a m e Are a<br><br>( h a )<br><br>T o f E ( m i n s )<br><br>C ove r L eve l ( m )<br><br>Eas n g ( m )<br><br>N o r t h i n g ( m )<br><br>D ept h ( m )<br><br>S t orage 0 . 0 2 6 5 . 0 0 1 0 0 . 0 0 0 0 . 0 0 0 0 . 0 0 0 2 . 0 0 0 S i m u la o n S e n g s R a infa l l Meth o d o l o g y<br><br>FS R Re g i o n M5-6 0 ( m m )<br><br>Ra o-R S u m m e r C V<br><br>W inte r C V<br><br>FS R E n g l a n d a n d Wa l e s 2 0 . 0 0 0 0 . 3 0 0<br><br>0 . 7 5 0<br>0 . 8 4 0<br><br><br>A n a lys i s S p e e d S k i p Ste a d y State<br><br>Dra i n Down T i m e ( m i n s ) A d d i o n a l S t orage ( m³/ h a ) C h e c k D i s c h arge Rate ( s ) C h e c k D i s c h arge Vo l u m e<br><br>N o r m a l x 2 4 0 2 0 . 0 x x<br><br>Sto r m D ura o n s 1 5 3 0 6 0 1 2 0 1 8 0 2 4 0 3 6 0 4 8 0 6 0 0 7 2 0 9 6 0 1 4 4 0<br><br>Re t u r n Pe r i o d (ye ars )<br><br>C l i mate C h a nge ( C C % )<br><br>A d d i o n a l Are a ( A % )<br><br>A d d i o n a l F l o w ( Q % ) 3 0<br><br>1 0 0<br><br>2 0 2 0<br><br>0 0<br><br>0 0<br><br>N o d e Storage O n l i n e Hydro-Brake ® C ontro l F l a p Va lve<br><br>Re p l a c e s Downstre a m L i n k Inve rt Leve l ( m ) D e s i g n D epth ( m ) D e s i g n F low ( l/s )<br><br>x<br><br>✓ 9 7 . 5 0 0 1 . 5 0 0 0 . 2<br><br>O b j e c ve<br><br>S u m p Ava i l a b l e Pro d u ct N u m b e r<br><br>Mi n O utlet D i a mete r ( m ) Mi n N o d e D i a mete r ( m m )<br><br>( H E ) Mi n i m i s e upstre a m st orage<br><br>✓ CT L-S H E-0 0 1 8-2 0 0 0-1 5 0 0-2 0 0 0<br><br>0 . 0 7 5<br>1 2 0 0<br><br><br>N o d e Storage D ept h/Are a Storage S t r u c t ure<br><br>B a s e Inf C oe c i ent ( m / h r ) S i d e Inf C oe c i ent ( m / h r )<br><br>0 . 0 0 0 0 0 0 . 0 0 0 0 0<br><br>Safety Fa c t o r Poro s ity<br><br>2 . 0 0 . 9 5<br><br>Inve rt Leve l ( m ) T i m e t o h a l f e mpty ( m i n s )<br><br>9 8 . 0 0 0<br><br>D ept h ( m )<br><br>Are a ( m ² )<br><br>Inf Are a ( m ² )<br><br>D ept h ( m )<br><br>Are a ( m ² )<br><br>Inf Are a ( m ² )<br><br>D ept h ( m )<br><br>Are a ( m ² )<br><br>Inf Are a ( m ² )<br><br>0 . 0 0 0 1 0 . 0 0 . 0 1 . 0 0 0 1 0 . 0 0 . 0 1 . 0 0 1 0 . 0 0 . 0<br><br>	N o d e s N a m e Are a<br><br>( h a )<br><br>T o f E ( m i n s )<br><br>C ove r L eve l ( m )<br><br>Eas n g ( m )<br><br>N o r t h i n g ( m )<br><br>D ept h ( m )<br><br>S t orage 0 . 0 2 6 5 . 0 0 1 0 0 . 0 0 0 0 . 0 0 0 0 . 0 0 0 2 . 0 0 0 S i m u la o n S e n g s R a infa l l Meth o d o l o g y<br><br>FS R Re g i o n M5-6 0 ( m m )<br><br>Ra o-R S u m m e r C V<br><br>W inte r C V<br><br>FS R E n g l a n d a n d Wa l e s 2 0 . 0 0 0 0 . 3 0 0<br><br>0 . 7 5 0<br>0 . 8 4 0<br><br><br>A n a lys i s S p e e d S k i p Ste a d y State<br><br>Dra i n Down T i m e ( m i n s ) A d d i o n a l S t orage ( m³/ h a ) C h e c k D i s c h arge Rate ( s ) C h e c k D i s c h arge Vo l u m e<br><br>N o r m a l x 2 4 0 2 0 . 0 x x<br><br>Sto r m D ura o n s 1 5 3 0 6 0 1 2 0 1 8 0 2 4 0 3 6 0 4 8 0 6 0 0 7 2 0 9 6 0 1 4 4 0<br><br>Re t u r n Pe r i o d (ye ars )<br><br>C l i mate C h a nge ( C C % )<br><br>A d d i o n a l Are a ( A % )<br><br>A d d i o n a l F l o w ( Q % ) 3 0<br><br>1 0 0<br><br>2 0 2 0<br><br>0 0<br><br>0 0<br><br>N o d e Storage O n l i n e Hydro-Brake ® C ontro l F l a p Va lve<br><br>Re p l a c e s Downstre a m L i n k Inve rt Leve l ( m ) D e s i g n D epth ( m ) D e s i g n F low ( l/s )<br><br>x<br><br>✓ 9 7 . 5 0 0 1 . 5 0 0 0 . 2<br><br>O b j e c ve<br><br>S u m p Ava i l a b l e Pro d u ct N u m b e r<br><br>Mi n O utlet D i a mete r ( m ) Mi n N o d e D i a mete r ( m m )<br><br>( H E ) Mi n i m i s e upstre a m st orage<br><br>✓ CT L-S H E-0 0 1 8-2 0 0 0-1 5 0 0-2 0 0 0<br><br>0 . 0 7 5<br>1 2 0 0<br><br><br>N o d e Storage D ept h/Are a Storage S t r u c t ure<br><br>B a s e Inf C oe c i ent ( m / h r ) S i d e Inf C oe c i ent ( m / h r )<br><br>0 . 0 0 0 0 0 0 . 0 0 0 0 0<br><br>Safety Fa c t o r Poro s ity<br><br>2 . 0 0 . 9 5<br><br>Inve rt Leve l ( m ) T i m e t o h a l f e mpty ( m i n s )<br><br>9 8 . 0 0 0<br><br>D ept h ( m )<br><br>Are a ( m ² )<br><br>Inf Are a ( m ² )<br><br>D ept h ( m )<br><br>Are a ( m ² )<br><br>Inf Are a ( m ² )<br><br>D ept h ( m )<br><br>Are a ( m ² )<br><br>Inf Are a ( m ² )<br><br>0 . 0 0 0 1 0 . 0 0 . 0 1 . 0 0 0 1 0 . 0 0 . 0 1 . 0 0 1 0 . 0 0 . 0<br><br>	N o d e s N a m e Are a<br><br>( h a )<br><br>T o f E ( m i n s )<br><br>C ove r L eve l ( m )<br><br>Eas n g ( m )<br><br>N o r t h i n g ( m )<br><br>D ept h ( m )<br><br>S t orage 0 . 0 2 6 5 . 0 0 1 0 0 . 0 0 0 0 . 0 0 0 0 . 0 0 0 2 . 0 0 0 S i m u la o n S e n g s R a infa l l Meth o d o l o g y<br><br>FS R Re g i o n M5-6 0 ( m m )<br><br>Ra o-R S u m m e r C V<br><br>W inte r C V<br><br>FS R E n g l a n d a n d Wa l e s 2 0 . 0 0 0 0 . 3 0 0<br><br>0 . 7 5 0<br>0 . 8 4 0<br><br><br>A n a lys i s S p e e d S k i p Ste a d y State<br><br>Dra i n Down T i m e ( m i n s ) A d d i o n a l S t orage ( m³/ h a ) C h e c k D i s c h arge Rate ( s ) C h e c k D i s c h arge Vo l u m e<br><br>N o r m a l x 2 4 0 2 0 . 0 x x<br><br>Sto r m D ura o n s 1 5 3 0 6 0 1 2 0 1 8 0 2 4 0 3 6 0 4 8 0 6 0 0 7 2 0 9 6 0 1 4 4 0<br><br>Re t u r n Pe r i o d (ye ars )<br><br>C l i mate C h a nge ( C C % )<br><br>A d d i o n a l Are a ( A % )<br><br>A d d i o n a l F l o w ( Q % ) 3 0<br><br>1 0 0<br><br>2 0 2 0<br><br>0 0<br><br>0 0<br><br>N o d e Storage O n l i n e Hydro-Brake ® C ontro l F l a p Va lve<br><br>Re p l a c e s Downstre a m L i n k Inve rt Leve l ( m ) D e s i g n D epth ( m ) D e s i g n F low ( l/s )<br><br>x<br><br>✓ 9 7 . 5 0 0 1 . 5 0 0 0 . 2<br><br>O b j e c ve<br><br>S u m p Ava i l a b l e Pro d u ct N u m b e r<br><br>Mi n O utlet D i a mete r ( m ) Mi n N o d e D i a mete r ( m m )<br><br>( H E ) Mi n i m i s e upstre a m st orage<br><br>✓ CT L-S H E-0 0 1 8-2 0 0 0-1 5 0 0-2 0 0 0<br><br>0 . 0 7 5<br>1 2 0 0<br><br><br>N o d e Storage D ept h/Are a Storage S t r u c t ure<br><br>B a s e Inf C oe c i ent ( m / h r ) S i d e Inf C oe c i ent ( m / h r )<br><br>0 . 0 0 0 0 0 0 . 0 0 0 0 0<br><br>Safety Fa c t o r Poro s ity<br><br>2 . 0 0 . 9 5<br><br>Inve rt Leve l ( m ) T i m e t o h a l f e mpty ( m i n s )<br><br>9 8 . 0 0 0<br><br>D ept h ( m )<br><br>Are a ( m ² )<br><br>Inf Are a ( m ² )<br><br>D ept h ( m )<br><br>Are a ( m ² )<br><br>Inf Are a ( m ² )<br><br>D ept h ( m )<br><br>Are a ( m ² )<br><br>Inf Are a ( m ² )<br><br>0 . 0 0 0 1 0 . 0 0 . 0 1 . 0 0 0 1 0 . 0 0 . 0 1 . 0 0 1 0 . 0 0 . 0<br><br>	N o d e s N a m e Are a<br><br>( h a )<br><br>T o f E ( m i n s )<br><br>C ove r L eve l ( m )<br><br>Eas n g ( m )<br><br>N o r t h i n g ( m )<br><br>D ept h ( m )<br><br>S t orage 0 . 0 2 6 5 . 0 0 1 0 0 . 0 0 0 0 . 0 0 0 0 . 0 0 0 2 . 0 0 0 S i m u la o n S e n g s R a infa l l Meth o d o l o g y<br><br>FS R Re g i o n M5-6 0 ( m m )<br><br>Ra o-R S u m m e r C V<br><br>W inte r C V<br><br>FS R E n g l a n d a n d Wa l e s 2 0 . 0 0 0 0 . 3 0 0<br><br>0 . 7 5 0<br>0 . 8 4 0<br><br><br>A n a lys i s S p e e d S k i p Ste a d y State<br><br>Dra i n Down T i m e ( m i n s ) A d d i o n a l S t orage ( m³/ h a ) C h e c k D i s c h arge Rate ( s ) C h e c k D i s c h arge Vo l u m e<br><br>N o r m a l x 2 4 0 2 0 . 0 x x<br><br>Sto r m D ura o n s 1 5 3 0 6 0 1 2 0 1 8 0 2 4 0 3 6 0 4 8 0 6 0 0 7 2 0 9 6 0 1 4 4 0<br><br>Re t u r n Pe r i o d (ye ars )<br><br>C l i mate C h a nge ( C C % )<br><br>A d d i o n a l Are a ( A % )<br><br>A d d i o n a l F l o w ( Q % ) 3 0<br><br>1 0 0<br><br>2 0 2 0<br><br>0 0<br><br>0 0<br><br>N o d e Storage O n l i n e Hydro-Brake ® C ontro l F l a p Va lve<br><br>Re p l a c e s Downstre a m L i n k Inve rt Leve l ( m ) D e s i g n D epth ( m ) D e s i g n F low ( l/s )<br><br>x<br><br>✓ 9 7 . 5 0 0 1 . 5 0 0 0 . 2<br><br>O b j e c ve<br><br>S u m p Ava i l a b l e Pro d u ct N u m b e r<br><br>Mi n O utlet D i a mete r ( m ) Mi n N o d e D i a mete r ( m m )<br><br>( H E ) Mi n i m i s e upstre a m st orage<br><br>✓ CT L-S H E-0 0 1 8-2 0 0 0-1 5 0 0-2 0 0 0<br><br>0 . 0 7 5<br>1 2 0 0<br><br><br>N o d e Storage D ept h/Are a Storage S t r u c t ure<br><br>B a s e Inf C oe c i ent ( m / h r ) S i d e Inf C oe c i ent ( m / h r )<br><br>0 . 0 0 0 0 0 0 . 0 0 0 0 0<br><br>Safety Fa c t o r Poro s ity<br><br>2 . 0 0 . 9 5<br><br>Inve rt Leve l ( m ) T i m e t o h a l f e mpty ( m i n s )<br><br>9 8 . 0 0 0<br><br>D ept h ( m )<br><br>Are a ( m ² )<br><br>Inf Are a ( m ² )<br><br>D ept h ( m )<br><br>Are a ( m ² )<br><br>Inf Are a ( m ² )<br><br>D ept h ( m )<br><br>Are a ( m ² )<br><br>Inf Are a ( m ² )<br><br>0 . 0 0 0 1 0 . 0 0 . 0 1 . 0 0 0 1 0 . 0 0 . 0 1 . 0 0 1 0 . 0 0 . 0<br><br>
F low+ v 1 0 . 2 C opy r i ght © 1 9 8 8-2 0 2 2 C a u seway Te c h n o l o g i e s Ltd	F low+ v 1 0 . 2 C opy r i ght © 1 9 8 8-2 0 2 2 C a u seway Te c h n o l o g i e s Ltd	F low+ v 1 0 . 2 C opy r i ght © 1 9 8 8-2 0 2 2 C a u seway Te c h n o l o g i e s Ltd	F low+ v 1 0 . 2 C opy r i ght © 1 9 8 8-2 0 2 2 C a u seway Te c h n o l o g i e s Ltd

	B B C o n s u l n g E n g i n e ers Ltd 1 0 My rtl e Street, D o u g l a s I s l e o f Ma n , IM1 1 E D	F i l e : A e n ua o n .pfd Netw o r k : S t o r m Netw o r k Dav i d B erg i n 0 8 / 1 2 / 2 0 2 2	Page 2 2 2-1 3 1 Te n n i s Ro a d B u nga low s 1 0 m 3 A e n ua o n Ta n k s
Re s u l t s fo r 3 0 ye a r + 2 0 % C C C r i ca l Sto r m D ura o n . L owest m a s s b a l a n c e : 8 7 . 3 7 % N o d e Event U S<br><br>N o d e<br><br>Pe a k ( m i n s )<br><br>L eve l ( m )<br><br>D ept h ( m )<br><br>In o w ( l/s )<br><br>N o d e Vo l ( m ³ )<br><br>F l o o d ( m ³ )<br><br>Stat u s<br><br>L i n k Event ( Upstre a m D ept h )<br><br>U S N o d e<br><br>L i n k O u l o w ( l/s )<br><br>D i s c h arge Vo l ( m ³ )<br><br>6 0 0 m i n ute winte r S t orage 4 8 0 9 9 . 6 9 2 1 . 6 9 2 1 . 1 9 . 9 4 9 6 0 . 0 0 0 0 O K<br><br>6 0 0 m i n ute winte r S t orage Hydro-Brake ® 0 . 2 8 . 8	Re s u l t s fo r 3 0 ye a r + 2 0 % C C C r i ca l Sto r m D ura o n . L owest m a s s b a l a n c e : 8 7 . 3 7 % N o d e Event U S<br><br>N o d e<br><br>Pe a k ( m i n s )<br><br>L eve l ( m )<br><br>D ept h ( m )<br><br>In o w ( l/s )<br><br>N o d e Vo l ( m ³ )<br><br>F l o o d ( m ³ )<br><br>Stat u s<br><br>L i n k Event ( Upstre a m D ept h )<br><br>U S N o d e<br><br>L i n k O u l o w ( l/s )<br><br>D i s c h arge Vo l ( m ³ )<br><br>6 0 0 m i n ute winte r S t orage 4 8 0 9 9 . 6 9 2 1 . 6 9 2 1 . 1 9 . 9 4 9 6 0 . 0 0 0 0 O K<br><br>6 0 0 m i n ute winte r S t orage Hydro-Brake ® 0 . 2 8 . 8	Re s u l t s fo r 3 0 ye a r + 2 0 % C C C r i ca l Sto r m D ura o n . L owest m a s s b a l a n c e : 8 7 . 3 7 % N o d e Event U S<br><br>N o d e<br><br>Pe a k ( m i n s )<br><br>L eve l ( m )<br><br>D ept h ( m )<br><br>In o w ( l/s )<br><br>N o d e Vo l ( m ³ )<br><br>F l o o d ( m ³ )<br><br>Stat u s<br><br>L i n k Event ( Upstre a m D ept h )<br><br>U S N o d e<br><br>L i n k O u l o w ( l/s )<br><br>D i s c h arge Vo l ( m ³ )<br><br>6 0 0 m i n ute winte r S t orage 4 8 0 9 9 . 6 9 2 1 . 6 9 2 1 . 1 9 . 9 4 9 6 0 . 0 0 0 0 O K<br><br>6 0 0 m i n ute winte r S t orage Hydro-Brake ® 0 . 2 8 . 8	Re s u l t s fo r 3 0 ye a r + 2 0 % C C C r i ca l Sto r m D ura o n . L owest m a s s b a l a n c e : 8 7 . 3 7 % N o d e Event U S<br><br>N o d e<br><br>Pe a k ( m i n s )<br><br>L eve l ( m )<br><br>D ept h ( m )<br><br>In o w ( l/s )<br><br>N o d e Vo l ( m ³ )<br><br>F l o o d ( m ³ )<br><br>Stat u s<br><br>L i n k Event ( Upstre a m D ept h )<br><br>U S N o d e<br><br>L i n k O u l o w ( l/s )<br><br>D i s c h arge Vo l ( m ³ )<br><br>6 0 0 m i n ute winte r S t orage 4 8 0 9 9 . 6 9 2 1 . 6 9 2 1 . 1 9 . 9 4 9 6 0 . 0 0 0 0 O K<br><br>6 0 0 m i n ute winte r S t orage Hydro-Brake ® 0 . 2 8 . 8
F low+ v 1 0 . 2 C opy r i ght © 1 9 8 8-2 0 2 2 C a u seway Te c h n o l o g i e s Ltd	F low+ v 1 0 . 2 C opy r i ght © 1 9 8 8-2 0 2 2 C a u seway Te c h n o l o g i e s Ltd	F low+ v 1 0 . 2 C opy r i ght © 1 9 8 8-2 0 2 2 C a u seway Te c h n o l o g i e s Ltd	F low+ v 1 0 . 2 C opy r i ght © 1 9 8 8-2 0 2 2 C a u seway Te c h n o l o g i e s Ltd

	B B C o n s u l n g E n g i n e ers Ltd 1 0 My rtl e Street, D o u g l a s I s l e o f Ma n , IM1 1 E D	F i l e : A e n ua o n .pfd Netw o r k : S t o r m Netw o r k Dav i d B erg i n 0 8 / 1 2 / 2 0 2 2	Page 3 2 2-1 3 1 Te n n i s Ro a d B u nga low s 1 0 m 3 A e n ua o n Ta n k s
Re s u l t s fo r 1 0 0 ye a r + 2 0 % C C C r i ca l Sto r m D ura o n . L owest m a s s b a l a n c e : 8 7 . 3 7 % N o d e Event U S<br><br>N o d e<br><br>Pe a k ( m i n s )<br><br>L eve l ( m )<br><br>D ept h ( m )<br><br>In o w ( l/s )<br><br>N o d e Vo l ( m ³ )<br><br>F l o o d ( m ³ )<br><br>Stat u s<br><br>L i n k Event ( Upstre a m D ept h )<br><br>U S N o d e<br><br>L i n k O u l o w ( l/s )<br><br>D i s c h arge Vo l ( m ³ )<br><br>7 2 0 m i n ute winte r S t orage 4 2 0 1 0 0 . 0 0 0 2 . 0 0 0 1 . 3 1 0 . 0 2 9 6 3 . 7 2 6 9 FLO O D<br><br>7 2 0 m i n ute winte r S t orage Hydro-Brake ® 0 . 3 1 0 . 7	Re s u l t s fo r 1 0 0 ye a r + 2 0 % C C C r i ca l Sto r m D ura o n . L owest m a s s b a l a n c e : 8 7 . 3 7 % N o d e Event U S<br><br>N o d e<br><br>Pe a k ( m i n s )<br><br>L eve l ( m )<br><br>D ept h ( m )<br><br>In o w ( l/s )<br><br>N o d e Vo l ( m ³ )<br><br>F l o o d ( m ³ )<br><br>Stat u s<br><br>L i n k Event ( Upstre a m D ept h )<br><br>U S N o d e<br><br>L i n k O u l o w ( l/s )<br><br>D i s c h arge Vo l ( m ³ )<br><br>7 2 0 m i n ute winte r S t orage 4 2 0 1 0 0 . 0 0 0 2 . 0 0 0 1 . 3 1 0 . 0 2 9 6 3 . 7 2 6 9 FLO O D<br><br>7 2 0 m i n ute winte r S t orage Hydro-Brake ® 0 . 3 1 0 . 7	Re s u l t s fo r 1 0 0 ye a r + 2 0 % C C C r i ca l Sto r m D ura o n . L owest m a s s b a l a n c e : 8 7 . 3 7 % N o d e Event U S<br><br>N o d e<br><br>Pe a k ( m i n s )<br><br>L eve l ( m )<br><br>D ept h ( m )<br><br>In o w ( l/s )<br><br>N o d e Vo l ( m ³ )<br><br>F l o o d ( m ³ )<br><br>Stat u s<br><br>L i n k Event ( Upstre a m D ept h )<br><br>U S N o d e<br><br>L i n k O u l o w ( l/s )<br><br>D i s c h arge Vo l ( m ³ )<br><br>7 2 0 m i n ute winte r S t orage 4 2 0 1 0 0 . 0 0 0 2 . 0 0 0 1 . 3 1 0 . 0 2 9 6 3 . 7 2 6 9 FLO O D<br><br>7 2 0 m i n ute winte r S t orage Hydro-Brake ® 0 . 3 1 0 . 7	Re s u l t s fo r 1 0 0 ye a r + 2 0 % C C C r i ca l Sto r m D ura o n . L owest m a s s b a l a n c e : 8 7 . 3 7 % N o d e Event U S<br><br>N o d e<br><br>Pe a k ( m i n s )<br><br>L eve l ( m )<br><br>D ept h ( m )<br><br>In o w ( l/s )<br><br>N o d e Vo l ( m ³ )<br><br>F l o o d ( m ³ )<br><br>Stat u s<br><br>L i n k Event ( Upstre a m D ept h )<br><br>U S N o d e<br><br>L i n k O u l o w ( l/s )<br><br>D i s c h arge Vo l ( m ³ )<br><br>7 2 0 m i n ute winte r S t orage 4 2 0 1 0 0 . 0 0 0 2 . 0 0 0 1 . 3 1 0 . 0 2 9 6 3 . 7 2 6 9 FLO O D<br><br>7 2 0 m i n ute winte r S t orage Hydro-Brake ® 0 . 3 1 0 . 7
F low+ v 1 0 . 2 C opy r i ght © 1 9 8 8-2 0 2 2 C a u seway Te c h n o l o g i e s Ltd	F low+ v 1 0 . 2 C opy r i ght © 1 9 8 8-2 0 2 2 C a u seway Te c h n o l o g i e s Ltd	F low+ v 1 0 . 2 C opy r i ght © 1 9 8 8-2 0 2 2 C a u seway Te c h n o l o g i e s Ltd	F low+ v 1 0 . 2 C opy r i ght © 1 9 8 8-2 0 2 2 C a u seway Te c h n o l o g i e s Ltd

ADD Planning Statement Re Drainage Dated

Source & Provenance