Environmental, Drainage, and Landscape Amendments: Presentation — original pdf

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2022 Environmental Code Amendments Phase 1 Codes and Ordinances Joint Committee A u g u s t 1 7 , 2 0 2 2 C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T Objective • Respond to por tion of Resolution 20220609- 061 that requires staff to bring for th an ordinance related to environmental protection in September amending Title 25 • Key subject areas Stormwater Landscape • • • Water Resource Protection Colorado River Protections • Previously identified minor code amendments and other amendments that meet the • objectives of the resolution Incentivize Missing Middle • C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 2 Progress So Far • Internal Water shed Protection Dept (WPD) technical staff • Input from other depar tments inc luding • Development Services Department • Austin Water • Austin Transportation • CoA Project Connect Office • Housing and Planning • Law • Environmental Commission Workgroup 7/25/2022 • Environmental Commission Update 8/3/2022 C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 3 Next Steps • 9/6/2022 - Environmental Commission • 9/13/2022 - Planning Commission • 9/29/2022 - City Council Phase 2: Greenfield Detention Requirements and Urban Slope Protection September & October Commissions • • November City Council C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 4 Stormwater “ 1 . E s t a b l i s h c r i t e r i a t h a t p r i o r i t i z e w h e n g r e e n s t o r m w a t e r m e t h o d s s h o u l d b e r e q u i r e d o r i n c e n t i v i z e d o v e r c o n v e n t i o n a l s t o r m w a t e r c o n t r o l s ” VS Rain garden Conventional Stormwater Control (Sedimentation & Filtration Pond) C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 5 Benefits of Green Stormwater Infrastructure (GSI) • I m p rove d e c o s y s t e m s e r v i c e s • I m p rove d s t o r m wa t e r i n f i l t r a t i o n • S o i l h e a l t h • W i l d l i f e h a b i t a t • H e a t i s l a n d m i t i g a t i o n • Wa t e r c o n s e r va t i o n • A e s t h e t i c va l u e C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 6 GSI Timeline • 2 0 1 2 : I m a g i n e A u s t i n a p p r o v e d • 2 0 1 3 : Wa t e r s h e d P r o t e c t i o n O r d i n a n c e a p p r o v e d • 2 0 1 4 : P h a s e 2 o f t h e Wa t e r s h e d P r o t e c t i o n O r d i n a n c e A u s t i n Wa t e r R e s o u r c e P l a n n i n g Ta s k F o r c e • 2 0 1 5 : G r e e n I n f r a s t r u c t u r e Wo r k i n g G r o u p W P D C o d e N E X T Te a m • 2 0 1 6 : D e v e l o p m e n t a n d a p p r o v a l o f d r a f t c o d e l a n g u a g e N a t u r a l & B u i l t E n v i r o n m e n t P r e s c r i p t i o n P a p e r • 2 0 1 7 : G S I p r o p o s a l i n c l u d e d i n C o d e N E X T C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 7 GSI Timeline • 2 0 1 7 : O r i g i n a l G S I p r o p o s a l i n c l u d e i n D r a f t 1 a n d 2 o f C o d e N E X T R e v i s e d G S I p r o p o s a l d e v e l o p e d f o r i n c l u s i o n i n D r a f t 3 C o u n c i l R e s o l u t i o n f o r G r e e n I n f r a s t r u c t u r e / G S I • 2 0 1 8 : C o d e N E X T p r o c e s s e n d e d b y C i t y C o u n c i l • 2 0 1 9 : C o u n c i l a d o p t s p o l i c y d i r e c t i o n t o g u i d e L D C R e v i s i o n G S I p r o p o s a l r e v i s e d f o r i n c l u s i o n i n p u b l i c d r a f t • 2 0 2 0 : L D C R e v i s i o n h a l t e d a f t e r D i s t r i c t C o u r t r u l i n g • 2 0 2 2 : N e w C o u n c i l R e s o l u t i o n f r o m C i t y C o u n c i l ( 2 0 2 2 0 6 0 9- 0 6 1 ) C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 8 Stormwater “ 1 . E s t a b l i s h c r i t e r i a t h a t p r i o r i t i ze w h e n g r e e n s t o r m w a t e r m e t h o d s s h o u l d b e r e q u i r e d o r i n c e n t i v i ze d o ve r c o n ve n t i o n a l s t o r m w a t e r c o n t r o l s ” D r a f t Re c o m m e n d a t i o n • A d o p t L D C Rew r i t e 2 n d Re a d i n g Re c o m m e n d a t i o n • C o d e A m e n d m e n t s • Require GSI for sites with less than 90% impervious cover • Carve outs for sites that treat existing impervious cover with an area greater than 10 acres or for sites that may generate highly contaminated runoff • Allow administrative variance with conditions • F u t u r e E n v i r o n m e n t a l C r i t e r i a M a n u a l ( E C M ) a m e n d m e n t s t o m o r e c l e a r l y d e f i n e G S I • C o n s i d e r i m p r o ve m e n t t o s e d i m e n t a t i o n / f i l t r a t i o n p o n d d e s i g n s t a n d a r d s C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 9 Stormwater “ 2 . Re q u i r e s u r f a c e p a r k i n g l o t s t o r m w a t e r t o e n t e r p e r v i o u s p a r k i n g l o t i s l a n d s, l a n d s c a p e d m e d i a n s, a n d p e r i m e t e r l a n d s c a p e s a s a m e t h o d o f w a t e r q u a l i t y a n d r e q u i r e t h a t p a ve m e n t b e g r a d e d t o a l l o w r u n o f f t o e n t e r p l a n t i n g a r e a s ” D r a f t Re c o m m e n d a t i o n • S t a f f d o n o t r e c o m m e n d r e q u i r i n g a l l l a n d s c a p e a r e a s t o s e r ve a s w a t e r q u a l i t y c o n t r o l s f o r w a t e r q u a l i t y t r e a t m e n t r e q u i r e m e n t s • Re m o ve r e q u i r e m e n t t h a t a l l p a r k i n g l o t l a n d s c a p e a r e a s b e p r o t e c t e d b y a 6 ” c u r b ( L D C 2 5- 2 - 1 0 0 7 P a r k i n g L o t s ) • Re m o ve s t o r m w a t e r i r r i g a t i o n r e q u i r e m e n t ( L D C 2 5- 2 - 1 0 0 8 I r r i g a t i o n Re q u i r e m e n t s ) • Re q u i r e a p p l i c a n t s t o d r a i n s t o r m w a t e r t o l a n d s c a p e a r e a s w h e r e p o s s i b l e ( L D C 2 5- 8 - 1 8 5 O ve r l a n d Fl o w ) C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 10 Stormwater “ 5 . A l l ow c i s t e r n s t o b e s i ze d b eyo n d t h e r e q u i r e d s t o r m c a p t u r e a m o u n t a n d r e m ove r e q u i r e m e n t f o r s t o r m wa t e r r e l e a s e s o t h a t t h ey c a n s u p p l y i r r i g a t i o n n e e d s t h ro u g h o u t t h e ye a r ” D r a f t Re c o m m e n d a t i o n • L a n d D eve l o p m e n t C o d e a n d E nv i ro n m e n t a l C r i t e r i a M a n u a l a l r e a d y a l l ow c i s t e r n s t o b e s i ze d b eyo n d r e q u i r e d s t o r m c a p t u r e a m o u n t = n o c o d e a m e n d m e n t n e c e s s a r y • E C M u p d a t e t o c o n t i n u e i nve s t i g a t i n g e m e r g i n g t e c h n o l o g y, i n c l u d i n g s m a r t c o n t ro l s, t o d e t e r m i n e r e l e a s e r e q u i r e m e n t s f o r wa t e r q u a l i t y • C o n t i n u e d c l o s e c o l l a b o r a t i o n b e t we e n Au s t i n Wa t e r a n d W P D s t a f f C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 11 What is Functional Green? “3. Implement Functional Green requirements for proper ties with more than 80% allowable imper vious cover” F u n c t i o n a l G r e e n L a n d s c a p e i s b a s e d o n t h e e c o s y s t e m s e r v i c e v a l u e c r e a t e d b y l a n d s c a p e . I t i s i n t e n d e d t o i m p r o v e e c o l o g i c a l b a l a n c e, r e p l e n i s h n a t i v e v e g e t a t i o n , a n d e n h a n c e p u b l i c h e a l t h , s a f e t y, a n d w e l f a r e . T h e F u n c t i o n a l G r e e n S c o r e m e a s u r e s t h e t o t a l a m o u n t o f e c o s y s t e m s e r v i c e s p r o v i d e d b y t h e l a n d s c a p e e l e m e n t s p r o p o s e d f o r a d e v e l o p m e n t s i t e . L a n d s c a p e p l a n s a r e r e q u i r e d t o r e a c h a t o t a l t a r g e t F u n c t i o n a l G r e e n S c o r e b a s e d o n t h e a s s i g n e d v a l u e p e r s q u a r e f o o t a r e a o f e a c h l a n d s c a p e e l e m e n t i n r e l a t i o n t o t h e a r e a o f t h e s i t e . C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 12 What is Functional Green? R e q u i r e d n u m b e r o f p o i n t s b a s e d o n s i t e a r e a f o r h i g h i m p e r v i o u s s i t e s . L a n d s c a pe e l e m e n t s m a y i n c l u d e : • E x i s t i n g o r n e wl y p l a n t e d t r e e s • S h r u b s , o r n a m e n t a l g r a s s e s , p e r e n n i a l f o r b s , g r o u n d c o v e r s I r r i g a t i o n w i t h a l t e r n a t i v e w a t e r s o u r c e s • T u r f a r e a s m a i n t a i n e d f o r a e s t h e t i c o r a t h l e t i c u s e s • V e g e t a t e d w a l l • • V e g e t a t e d r o o f • R a i n g a r d e n s • P o r o u s p a v e m e n t • S u s p e n d e d p a v e m e n t s y s t e m ( f o r i m p r o v e d u r b a n • P o l l i n a t o r r e s o u r c e s • P u b l i c l y a c c e s s i b l e g r e e n s p a c e a d j a c e n t t o R O W o r t r e e h e a l t h ) p u b l i c s i d e w a l k C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 13 Functional Green “3. Implement Functional Green requirements for proper ties with more than 80% allowable imper vious cover” Draft Recommendation • Uphold previous recommendation from LDC rewrite 2 nd reading with minor edits • New Landscape Section in LDC 25-2-1009 • Applies to Central Business District and Downtown Mixed- Use zoning districts and other sites with greater than 80% allowable imper vious cover C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 14 Water Resource Protection “ 7 . P ro h i b i t i n- c h a n n e l d e t e n t i o n p o n d s, exc e p t f o r c a p i t a l p ro j e c t s o r p r i va t e / p u bl i c p a r t n e r s h i p s w h e r e n o o t h e r a l t e r n a t i ve i s f e a s i bl e ” D r a f t Re c o m m e n d a t i o n • L D C c o d e a m e n d m e n t t o 2 5- 8 - 2 6 1 ( F ) w h i c h a l l ow s i n - c h a n n e l d e t e n t i o n a n d we t p o n d s Example of existing in-channel detention pond C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 15 Water Resource Protection “ 8 . Re q u i r e p r o j e c t s t o r e l o c a t e r e p l a c e d o r u p s i ze d w a s t ew a t e r p i p e s o u t s i d e o f t h e i n n e r h a l f o f t h e c r i t i c a l w a t e r q u a l i t y Z o n e … 1 0 . Re q u i r e u t i l i t y e a s e m e n t s t o m e e t t h e s a m e s t a n d a r d s a s u t i l i t y p i p e s w i t h i n c r e e k s a n d c r e e k b u f f e r s ” D r a f t Re c o m m e n d a t i o n • C o d e a m e n d m e n t t o L D C 2 5- 8 - 2 6 1 ( D ) r e l a t i n g t o u t i l i t y l i n e s i n C r i t i c a l Wa t e r Q u a l i t y Z o n e s • C o d e a m e n d m e n t t o L D C 2 5- 8 - 2 6 1 ( E ) r e l a t i n g t o u t i l i t y l i n e s r u n n i n g p a r a l l e l t o C r i t i c a l Wa t e r Q u a l i t y Z o n e s i n u r b a n a n d s u b u r b a n w a t e r s h e d s C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 16 Water Resource Protection “ 9 . P rov i d e we t l a n d p ro t e c t i o n s a n d bu f f e r s e q u a l l y a l o n g L a d y B i r d L a ke t o h e l p s t a b i l i ze a n d p r eve n t e ro s i o n a l o n g t h e s h o r e l i n e ” D r a f t Re c o m m e n d a t i o n • C o d e a m e n d m e n t t o L D C 2 5- 8 - 2 8 2 ( A ) We t l a n d P ro t e c t i o n • Re t a i n ex i s t i n g exe m p t i o n s f o r we t l a n d s b o u n d e d by I - 3 5 , R i ve r s i d e D r, B a r t o n S p r i n g s R d , L a m a r, a n d 1 5 t h S t r e e t bu t c a r ve o u t t h e we t l a n d s a s s o c i a t e d w i t h L a d y B i r d L a ke. C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 17 Colorado River Protections “ T h e C i t y C o u n c i l d i r e c t s t h e C i t y M a n a g e r t o eva l u a t e t h e e f f e c t i ve n e s s o f ex i s t i n g C r i t i c a l Wa t e r Q u a l i t y Z o n e a n d E r o s i o n H a z a r d Z o n e b u f f e r s o n t h e C o l o r a d o R i ve r d o w n s t r e a m o f t h e L o n g h o r n D a m a n d t o p r o p o s e p r o t e c t i o n s t h a t w i l l p r o v i d e a d e q u a t e p r o t e c t i o n s t o t h e r i ve r t h a t w i l l e n s u r e a h e a l t h y r i p a r i a n c o r r i d o r t o s t a b i l i ze t h e r i ve r b a n k a n d p r o t e c t p r o p e r t y f r o m e r o s i o n ” E x i s t i n g L D C r e q u i r e m e n t s i n c l u d e : - E r o s i o n H a z a r d Z o n e a n a l y s i s w i t h i n 1 0 0 ’ o f t h e O r d i n a r y H i g h Wa t e r M a r k ( O H W M ) - C r i t i c a l Wa t e r Q u a l i t y Z o n e ( C W Q Z ) e s t a b l i s h e d a t 2 0 0 ’ - 4 0 0 ’ f e e t d e p e n d i n g o n 1 0 0 - y e a r f l o o d p l a i n - N o s p e c i a l c o n s i d e r a t i o n f o r s t o r m w a t e r d i s c h a r g e o n h i g h l y e r o d i b l e b a n k o f t h e C o l o r a d o R i v e r C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 18 Colorado River Protections “ T h e C i t y C o u n c i l d i r e c t s t h e C i t y M a n a g e r t o e v a l u a t e t h e e f f e c t i v e n e s s o f e x i s t i n g C r i t i c a l Wa t e r Q u a l i t y Z o n e a n d E r o s i o n H a z a r d Z o n e b u f f e r s o n t h e C o l o r a d o R i v e r d o w n s t r e a m o f t h e L o n g h o r n D a m a n d t o p r o p o s e p r o t e c t i o n s t h a t w i l l p r o v i d e a d e q u a t e p r o t e c t i o n s t o t h e r i v e r t h a t w i l l e n s u r e a h e a l t h y r i p a r i a n c o r r i d o r t o s t a b i l i z e t h e r i v e r b a n k a n d p r o t e c t p r o p e r t y f r o m e r o s i o n ” D r a f t R e c o m m e n d a t i o n • C o d e a m e n d m e n t t o L D C 2 5 - 7 - 3 2 D i r e c t o r A u t h o r i z e d t o R e q u i r e E r o s i o n H a z a r d Z o n e A n a l y s i s – e x p a n d e d t o 4 0 0 ’ f r o m O r d i n a r y H i g h Wa t e r M a r k ( O H W M ) • C o d e a m e n d m e n t t o L D C 2 5 - 8 - 9 2 C r i t i c a l Wa t e r Q u a l i t y Z o n e s E s t a b l i s h e d t o e x p a n d C W Q Z t o 4 0 0 ’ f r o m O H W M • C o d e a m e n d m e n t t o L D C 2 5 - 8 - 2 6 1 ( E ) t o r e q u i r e n e w s t o r m w a t e r o u t f a l l s t o d i s c h a r g e i n d r a i n a g e s l o c a t e d u p s t r e a m o f t h e C o l o r a d o R i v e r • U p d a t e C i t y o f A u s t i n P r o p e r t y P r o f i l e v i e w e r t o s h o w e s t i m a t e d l o c a t i o n o f O H W M C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 19 Other code amendments “ 1 1 . A d d r e s s c u r r e n t e nv i ro n m e n t a l c o d e i n c o n s i s t e n c i e s a n d o t h e r m i n o r c o d e r ev i s i o n s i n C h a p t e r s 2 5- 7 a n d 2 5- 8 t h a t s t a f f h a ve p r ev i o u s l y i d e n t i f i e d a n d r ev i ewe d a s p a r t o f t h e C o d e N ex t a n d t h e L a n d D eve l o p m e n t C o d e r ev i s i o n p ro c e s s. Th e C i t y C o u n c i l i n i t i a t e s o t h e r c o d e a m e n d m e n t s, a s n e c e s s a r y, t o a c c o m p l i s h t h e g o a l s o f t h i s Re s o l u t i o n . Th e C i t y C o u n c i l ex p e c t s t h a t t h e s e c o d e a m e n d m e n t s w i l l u s e t h e p r ev i o u s s t a f f wo rk a n d , w h e r e a p p ro p r i a t e, a d h e r e a s c l o s e l y a s p o s s i bl e t o t h e l a n g u a g e a n d i n t e n t o f t h e o r d i n a n c e s p r ev i o u s l y d r a f t e d a n d r ev i ewe d t h ro u g h t h e p ro p o s e d r ev i s i o n o f t h e L a n d D eve l o p m e n t C o d e.” C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 20 Other code amendments D r a f t Re c o m m e n d a t i o n • U p d a t e t o c o r r e c t d e p a r t m e n t n a m e s a n d a c c o u n t a b l e o f f i c i a l s • M i n o r r e o r g a n i z a t i o n o f c e r t a i n s e c t i o n s • Minor revisions to titles to improve readability • 25-2 Landscape streetyard tree requirements consolidated with other streetyard landscape requirements • 25-8 Division 1 Critical Water Quality Zone Restrictions renamed Waterway and Floodplain • 25-8 Floodplain modification criteria moved directly after Critical Water Quality Zone • 25-2-1179(B) Bulkhead wave abatement requirements moved to 25-8-261(C) • Move lake fill/land capture & lake dredge requirements to 25-8-261(C) • M i n o r e d i t s t o i m p r o ve c l a r i t y w i t h o u t c h a n g i n g i n t e n t • Edits to floodplain modification language • Edits to roadside ditch exemption • E x e m p t r a i n w a t e r h a r ve s t i n g c i s t e r n s f r o m i m p e r v i o u s c o ve r c a l c u l a t i o n s C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 21 Other code amendments D r a f t Re c o m m e n d a t i o n • S t r e a m l i n e a n d c l a r i f y p ro c e s s f o r r e d eve l o p m e n t exc e p t i o n s i n U r b a n , S u bu r b a n , Wa t e r S u p p l y S u bu r b a n , a n d Wa t e r S u p p l y Ru r a l wa t e r s h e d s • M i n o r e d i t s t o B a r t o n S p r i n g s Z o n e r e d eve l o p m e n t exc e p t i o n t o a l l ow G S I w h e n s e d i m e n t a t i o n / f i l t r a t i o n p o n d s a r e c u r r e n t l y r e q u i r e d • U p d a t e E nv i ro n m e n t a l Re s o u r c e I nve n t o r y r e q u i r e m e n t t o r e m ove c e r t a i n ( W QT Z , E A C o n t r i bu t i n g Z o n e, DW P Z ) t r i g g e r s a n d a d d r e q u i r e m e n t f o r u p l a n d p o n d e d a r e a s p r ev i o u s l y i d e n t i f i e d i n G I S • U p d a t e s t r e e t c ro s s i n g r e q u i r e m e n t s t o u s e l a n g u a g e c o n s i s t e n t w i t h A S M P C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 22 Other code amendments D r a f t Re c o m m e n d a t i o n • A l l ow C r i t i c a l E nv i ro n m e n t a l Fe a t u r e va r i a n c e s t o b e a p p rove d a t s t a f f l eve l exc e p t w h e n m e c h a n i ze d p e d e s t r i a n a c c e s s i s p ro p o s e d w i t h i n 5 0 0’ o f L a ke Au s t i n • A l l ow S C M r e t ro f i t s i n f l o o d p l a i n a n d w i t h i n 5 0 ’ o f a C E F t o a d d r e s s ex i s t i n g d r a i n a g e i s s u e s • C l a r i f y t h e ex i s t i n s u b d i v i s i o n r e q u i r e m e n t s r e l a t e d t o C E F s • Re m ove c o d e l a n g u a g e t h a t ex p l i c i t l y a l l ow s we t l a n d s t o s e r ve a s wa t e r q u a l i t y c o n t ro l s C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 23 Other code amendments D r a f t Re c o m m e n d a t i o n • U p d a t e c u t / f i l l r e s t r i c t i o n s t o a l l ow c u t / f i l l i n exc e s s o f 4 ’ f o r c o n s t r u c t i o n o f s t r e e t o r d r i vewa y n e c e s s a r y t o p rov i d e p r i m a r y a c c e s s w i t h c o n d i t i o n s • Re m ove 2 5 - 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Environmental Commission • 9/13/2022 - Planning Commission • 9/29/2022 - City Council Phase 2: Greenfield Detention Requirements and Urban Slope Protection September & October Commissions • • November City Council C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 28 Questions C I T Y O F A U S T I N W A T E R S H E D P R O T E C T I O N D E P A R T M E N T 29