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DRAF T RE SUL T S: DAT A GAT HE RING AND ASSE SSME NT OF RE GIONAL ST ORMWAT E R GIS DAT A (PHASE 1) NNWPC Ite m 5 Jeremy M. Smith, TMRPA Jim Smitherman, WRWC 2/7/2018 Initial Obje c tive s Re q ue st b y the We ste rn Re g

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SLIDE 1

DRAF T RE SUL T S: DAT

A GAT HE RING AND ASSE SSME NT OF RE GIONAL ST ORMWAT E R GIS DAT A (PHASE 1)

NNWPC Ite m 5

Jeremy M. Smith, TMRPA Jim Smitherman, WRWC 2/7/2018

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SLIDE 2

Initial Obje c tive s

  • Re q ue st b y the We ste rn Re g io na l Wa te r Co mmissio n to

inve stig a te , c o mpile a nd c o mple te a GI S ne two rk de sc rib ing sto rmwa te r c o nve ya nc e in the T ruc ke e Me a do ws.

  • I

nitia l sc o pe c o nte mpla te d 3 pha se s:

 Da ta g a the ring a nd a sse ssme nt  GI

S da ta e diting a nd da ta c o mple tio n o f sto rmwa te r c o nve ya nc e ne two rk

 Cre a tio n o f a nc illa ry da ta la ye rs (e .g . impe rvio us surfa c e , hillside

dra ina g e ne two rks)

  • Appro va l o f funds fo r Pha se 1: Da ta Ga the ring a nd Asse ssme nt

 Dra ft re sults o f Pha se 1 c o nstitute the re ma inde r o f to da y’ s pre se nta tio n

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SLIDE 3

Study Ar e a

  • E

va lua te d da ta a va ila b ility b y hydro b a sin

  • F
  • c us o n Wa sho e Co unty

de ve lo pe d me tro a re a

T MSA

Wa sho e Va lle y

Ad ja c e nt no rthe rn va lle ys

  • I

nc lude s a re a s o utside the T ruc ke e Rive r dra ina g e

(e .g . No rth Va lle ys)

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SLIDE 4

Re sults Ove r vie w

Hydro ba sins ra nke d

(1 = mo st c o mple te )

1.

Spa nish Spring s Va lle y

2.

L e mmo n Va lle y (we st)

3.

L e mmo n Va lle y (e a st)

4.

Wa sho e Va lle y

5.

Sun Va lle y

6.

T ruc ke e Ca nyo n (we st)

7.

Ple a sa nt Va lle y

8.

T ruc ke e Me a do ws

9.

Co ld Spring s Va lle y

Values indicate averaged ratios of stormwater features to development features by hydro basin

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SLIDE 5

Analysis Appr

  • ac h
  • Ac q uire re le va nt a nd a va ila b le sto rmwa te r GIS da ta
  • Co mpa re c o ve ra g e o f sto rmwa te r da ta to
  • c c urre nc e o f de ve lo pme nt da ta in e a c h hydro

b a sin

Assumption: the r e is a r e la tionship be twe e n the

  • c c ur

r e nc e of de ve lopme nt a nd the ne e d for stor mwa te r c onve ya nc e fe a tur e s

  • Cre a te d a q ua rte r-mile a na lysis g rid to divide up the

re g io n into e q ua l-size d a na lysis b ins

T

  • ta l o f 3,663 g rid sq ua re s c o ve r d e ve lo pe d a re a s within

the stud y a re a

  • T
  • de fine de ve lo pe d a re a s we use d a c o mb ina tio n o f

thre e da ta so urc e s:

Dwe lling units a nd / o r b usine ss po int lo c a tio ns (WC Asse sso r and I nfo g ro up)

Ro a d le ng th (WC GI S)

Build ing sq ua re fo o ta g e (WC Asse sso r)

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SLIDE 6

Visual Asse ssme nt

  • I

nitia l c a te g o riza tio n o f e a c h sq ua re thro ug h a visua l a sse ssme nt using de ve lo pme nt da ta , sto rmwa te r da ta a nd a e ria l ima g e ry

  • T

hre e c a te g o rie s:

(1) Ha s SW da ta , a ppe a rs suffic ie nt

(2) Ha s SW da ta , a ppe a rs insuffic ie nt

(3) Do e s no t ha ve SW da ta , a ppe a rs insuffic ie nt

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SLIDE 7

Quantitative Asse ssme nt

  • Ca lc ula tio n o f ra tio s tha t c o mpa re the o c c urre nc e o f GI

S fe a ture s de sc rib ing de ve lo pme nt in a g ive n g rid sq ua re to the o c c urre nc e o f sto rmwa te r GI S fe a ture s in tha t sa me g rid sq ua re

  • E

xa mple :

47 Housing Units 5 Manholes

470 Housing Units

5 Manholes Grid 1 Grid 2 47 / 5 = 9.4 ratio value 470 / 5 = 94 ratio value

Mor

  • re

e Com

  • mpl

plete te Les ess s Com

  • mpl

plete te

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SLIDE 8

Re lationships E xamine d

Buil ildin ding S g Squa uare re Foot

  • tage

age Roa Roads Hous using ing & & Busin siness ess Poin ints ts

Sto torm rmwat ater F Feat atures es Dev evel elopm pment F t Feat ature res

Stor

  • rmwa

mwater ter Line ne F Featu atures res Stor

  • rmwa

mwater ter Poin int F t Feat ature ures

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SLIDE 9

Ave r age Standar dize d Ratios

The results for each ratio calculation combination were standardized by their average value to allow for comparison across ratio combinations

Mor More Comp mplet lete Les Less Comp mplet lete

Average Standardized Ratio Values

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SLIDE 10

E stimating Ratios In Data Gaps

y = 0.1276x0.8694

R² = 0.9766 5 10 15 20 25 30 100 200 300 400 500 Ratio Values Feature Count

Housing & Business Points Versus Stormwater Points

A set of proxy ratios based on existing development data were estimated in ca. 750 grid cells where no stormwater data were present

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SLIDE 11

Re sults Ove r vie w: Re pr ise

Hydro ba sins ra nke d

(1 = mo st c o mple te )

1.

Spa nish Spring s Va lle y

2.

L e mmo n Va lle y (we st)

3.

L e mmo n Va lle y (e a st)

4.

Wa sho e Va lle y

5.

Sun Va lle y

6.

T ruc ke e Ca nyo n (we st)

7.

Ple a sa nt Va lle y

8.

T ruc ke e Me a do ws

9.

Co ld Spring s Va lle y

Values indicate averaged ratios of stormwater features to development features by hydro basin

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SLIDE 12

Othe r SW Data Conside r ations

  • T

he fo llo wing da ta ite ms ha ve a lso b e e n a sse sse d a nd will b e furthe r de ta ile d in the fina l re po rt do c ume nt

 Attrib ute fie lds  Are a l fe a ture s (e .g . re te ntio n b a sins)  T

  • po lo g ic a l c o nne c tivity

 Hydro g ra phic fe a ture s (e .g . stre a ms)  I

rrig a tio n ditc he s

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SLIDE 13

Initial Conc lusions

  • Our re g io n is fa r a lo ng to wa rd c o mpiling a c o mple te

“sc he ma tic vie w” o f sto rmwa te r c o nve ya nc e infra struc ture

  • Ar
  • und 60% of our

de ve lope d ar e as appe ar to have ade quate GIS data c ove r age of stor mwate r c onve yanc e fe atur e s

  • So me da ta g a ps a ppe a r to e xist with a ro und 20% o f

de ve lo pe d a re a s e xhib iting no sto rmwa te r da ta a nd a no the r 20% o r so tha t like ly ne e d a dditio na l fe a ture s ma ppe d

  • Co ve ra g e is mo st c o mple te in se ve ra l o f the No rth Va lle ys a nd

in Wa sho e Va lle y. Ga ps in c o ve ra g e e xist in Co ld Spring s a nd in the T ruc ke e Me a do ws pro pe r

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SLIDE 14

Ne xt Ste ps

  • Ce ntra lize d sto ra g e o f e xisting GI

S da ta de sc rib ing sto rmwa te r c o nve ya nc e in T MRPA re g io na l da ta wa re ho use (in

process)

 Da ta will b e a va ila b le to a ll pa rtic ipa ting a g e nc ie s, re le va nt

sta ke ho lde rs a nd inte re ste d pa rtie s via a de dic a te d we bpa g e

 Online ma p vie we r a nd a c c e ss to fina l r

e por t

 Sc he dule o f pe rio dic upda te s to tr

a c k pr

  • g r

e ss fro m this initia l

b e nc hma rk

  • Ac c e ss to the a sse ssme nt da ta will undo ub te dly a llo w

inte re ste d pa rtie s to judg e whe re we a re missing da ta tha t ma y a c tua lly b e a va ila b le !

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SLIDE 15

Ne xt Ste ps

  • Co ntinue d c o lla b o ra tio n a nd pa rtic ipa tio n in se ve ra l re la te d

a nd o ng o ing initia tive s

 One T

ruc ke e Rive r – 2018 Ac tio n Pla n: Sto rmwa te r, Ve g e ta tio n a nd Wa te rshe d Ma na g e me nt Gro up

 Re g io na l Wa te rshe d Ma na g e me nt Pla n Upda te (City o f Re no a nd Sta nte c )  So urc e Wa te r Pro te c tio n Pro g ra m (NDE

P a nd RCI )

  • Co nve ne a me e ting with pub lic wo rks sta ff to e xa mine this

re se a rc h a nd he lp c ra ft a re a listic pro po sa l to c o mple te the sc he ma tic -le ve l da ta c o ve ra g e (i.e . Pha se 2)

 T

MRPA is e ng a g e d in a Re g io na l Pla n Upda te a nd ha s re so urc e c o nstra ints

 Pub lic wo rks sta ff ha ve the e xpe rie nc e to a c c ura te ly e stima te time a nd

c o st to c o mple te a nd c o rre c tly c a pture da ta in the fie ld

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SLIDE 16