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I ng le wo o d Histo ric Pla t Dra ina g e Co de Pub lic Me e ting Sa mma mish Pub lic Wo rks Ma y 25, 2017 T o nig ht s Pre se nta tio n I ng le wo o d Pla t Histo ry Sto rmwa te r Co de City-wide c o de I ng le wo

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SLIDE 1

I ng le wo o d Histo ric Pla t Dra ina g e Co de Pub lic Me e ting

Sa mma mish Pub lic Wo rks

Ma y 25, 2017

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SLIDE 2

T

  • nig ht’ s Pre se nta tio n

 I

ng le wo o d Pla t Histo ry

 Sto rmwa te r Co de

  • City-wide c o de
  • I

ng le wo o d Pla t a re a Dra ina g e Co de

 De finitio ns  Ne xt Ste ps

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SLIDE 3

Wha t Wo n’ t b e Addre sse d T

  • nig ht

 Spe c ific ne ig hb o rho o d de ve lo pme nt pro po sa ls  I

ng le wo o d Hill Dra ina g e Ca pita l I mpro ve me nt Pro je c t

 E

xisting ne ig hb o rho o d dra ina g e pro b le ms

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SLIDE 4

I ng le wo o d Pla t Dra ina g e Histo ry

 Pla tte d in 1889  “Pa pe r Pla t”  No fo rma l ro a ds  No fo rma l dra ina g e

syste m

 Pa rc e ls ve ry sma ll,

a vg __ sf

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SLIDE 5

I ng le wo o d Pla t Dra ina g e Co de De ve lo pme nt Ba c kg ro und

 Dra ina g e re vie w wa s no t re q uire d fo r sing le fa mily re side ntia l

de ve lo pme nt a dding <2,000 SF ne w impe rvio us surfa c e

  • De ve lo pme nt disc ha rg ing unc o ntro lle d sto rmwa te ro nto

a dja c e nt ro a ds o r pro pe rtie s

  • E

ro sio n a nd flo o ding o c c ure d

 So lutio n  E

me rg e nc y Ordina nc e pa sse d 2014 a nd c o difie d in 2015

 Prima rily impa c ts I

ng le wo o d Pla t

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SLIDE 6

City-wide Sto rmwa te r Co de

 2,000 sf o r mo re o f ne w, re pla c e d, o r ne w plus re pla c e d

impe rvio us surfa c e , OR

 7,000 sf o r mo re o f la nd disturb ing a c tivity, OR  Co nstruc t o r mo dify a 12-inc h o r g re a te r sto rm pipe / ditc h, OR  Pro je c t lo c a te d within a Critic a l Dra ina g e Are a , OR  Co nta ins o r ne xt to a flo o d ha za rd a re a , OR  Re de ve lo pme nt with $100,000 o r mo re o f impro ve me nts o n

hig h-Use Site , OR

 Whe n ne w impro ve me nt c o sts e xc e e d 50% a sse sse d va lue o f

e xisting impro ve me nts Prio r to I ng le wo o d Pla t c o de , dra ina g e re vie w re q uire d whe n pro je c t wa s sub je c t to a c ity de ve lo pme nt pe rmit o r a ppro va l, AND wo uld re sult in:

SMC 13.20.020

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SLIDE 7

I ng le wo o d Pla t Sto rmwa te r Co de

Ne w o rdina nc e e nsure d fo llo wing ne w c o nditio ns a pplie d to I ng le wo o d Pla t*

 Dra ina g e re vie w re q uire d fo r c re a tio n o f 500 SF

  • r

mor e of new, r eplac ed or new plus r eplac ed imper vious sur fac e, AND

 I

f sto rmwa te rdra ins o ve r L a ndslide Ha za rd Are a with slo pe s >15%, the n

stor mwater tightline pipe is r equir ed thro ug h the la ndslide ha za rd a re a

to a n a c c e pta b le disc ha rg e po int unle ss:

  • 100% o f runo ff c a n b e sa fe ly infiltra te d, o r
  • <500 SF
  • f ne w impe rvio us surfa c e a dde d w/ in na tura l disc ha rg e a re a

 Ne w r

e quir e me nts base d on ge ogr aphy, no t o n c ritic al are a

de signatio n

* I t a lre a dy a pplie d to a ll E ro sio n a nd L a ndslide Ha za rd Critic a l Are a s

Or dinanc e No. 2015-389, SMC T itle 13

.

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SLIDE 8

City-wide E ro sio n a nd L a ndslide Ha za rd Critic a l Are a s

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SLIDE 9

I ng le wo o d Pla t Critic a l Are a s

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SLIDE 10

So me De finitio ns

Ne w I

mpe rvio us Surfa c e - SMC 13.10.480 Cre a tio n o f ha rd/ c o mpa c te d surfa c e s. E xa mple s inc lude :

Ro o fs Gra ve l Pa ve me nt Pe rme a b le pa ve me nt Drive wa ys Gre e n ro o fs

Re pla c e d I

mpe rvio us Surfa c e – SMC 13.10.590 I mpe rvio us surfa c e s re mo ve d a nd re e sta b lishe d a s impe rvio us surfa c e s. I nc lude s:

  • Re mo va l o f b uilding s do wn to fo unda tio n
  • Re mo va l o f pa ve me nt to b e lo w b a se c o urse
  • Re lo c a tio n o f impe rvio us surfa c e o n the pro je c t site
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SLIDE 11

So me De finitio ns (c o nt)

 L

a ndslide Ha za rd Are a - SMC 21A.15.680

  • Are a s po te ntia l sub je c t to risk o f ma ss e a rth mo ve me nt
  • Are a s with 40% slo pe s o r ste e pe r a nd with a ve rtic a l re lie f o f 10 o r

mo re fe e t

  • Are a s with o the r e xisting g e o lo g ic ha za rd c o nditio ns

 L

a ndslide Ha za rd Dra ina g e Are a - SMC 21A.15.681 Are a s tha t dra in to L a ndslide Ha za rd Are a s

 Critic a l Dra ina g e Are a s – SMC 21A.15.255

  • L

a ndslide Ha za rd Dra ina g e Are a s

  • Are a s tha t dra in to Pine o r Be a ve r L

a ke s

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SLIDE 12

So me De finitio ns (c o nt)

E

ro sio n Ha za rd Ne a r Se nsitive Wa te r Bo dy Ove rla y - SMC 21A.15.417

  • Ma ppe d e ro sio n ha za rd a re a s tha t dra in dire c tly to la ke s o r

stre a ms

  • Co nsists o f No Disturb a nc e Are a a nd Are a s Dra ining to No

Disturb a nc e Are a

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SLIDE 13

Ne xt Ste ps

Re vie w fe e db a c k fro m Pub lic Me e ting

Ma y 2017

Dra ft c o de re visio ns

June 8, 2017

Pla nning Co mmissio n Wo rk Se ssio n

June 15, 2017

Pla nning Co mmissio n Pub lic He a ring

July 6, 2017

City Co unc il Study Se ssio n

Se pt 2017

City Co unc il 1st Re a ding / Pub lic He a ring

Oc t 2017

City Co unc il 2nd Re a ding / Ado ptio n

Oc t 2017

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SLIDE 14

We ’ d like yo ur fe e db a c k:

Sho uld the c o de pro visio ns tha t o nly a ffe c t the I ng le wo o d Pla t b e c ha ng e d? I f so , in wha t wa y?