DRAF T RE SUL T S: DAT A GAT HE RING AND ASSE SSME NT OF - PowerPoint PPT Presentation

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 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

Study Ar e a E va lua te d da ta a va ila b ility  b y hydro b a sin F o 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) 

Re sults Ove r vie w Hydro ba sins ra nke d (1 = mo st c o mple te ) Spa nish Spring s Va lle y 1. L e mmo n Va lle y (we st) 2. L e mmo n Va lle y (e a st) 3. Wa sho e Va lle y 4. Sun Va lle y 5. T ruc ke e Ca nyo n (we st) 6. Ple a sa nt Va lle y 7. T ruc ke e Me a do ws 8. Co ld Spring s Va lle y 9. Values indicate averaged ratios of stormwater features to development features by hydro basin

Analysis Appr oac 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  o 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  oc 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 o 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 o 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) 

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 

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 Grid 1 Grid 2 E xa mple :  470 Housing Units 47 Housing Units 5 Manholes 5 Manholes 47 / 5 = 9.4 ratio value 470 / 5 = 94 ratio value Mor ore e Les ess s Com ompl plete te Com ompl plete te

Re lationships E xamine d Dev evel elopm pment F t Feat ature res Sto torm rmwat ater F Feat atures es Buil ildin ding S g Squa uare re Foot otage age Stor ormwa mwater ter Line ne F Featu atures res Roa Roads Stor ormwa mwater ter Poin int F t Feat ature ures Hous using ing & & Busin siness ess Poin ints ts

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 Average Standardized Ratio Values Mor More Comp mplet lete Les Less Comp mplet lete

E stimating Ratios In Data Gaps A set of proxy ratios based on existing development data were estimated in ca. 750 grid cells where no stormwater Housing & Business Points Versus data were present Stormwater Points 30 25 Ratio Values 20 15 10 y = 0.1276x0.8694 5 R² = 0.9766 0 0 100 200 300 400 500 Feature Count

Re sults Ove r vie w: Re pr ise Hydro ba sins ra nke d (1 = mo st c o mple te ) Spa nish Spring s Va lle y 1. L e mmo n Va lle y (we st) 2. L e mmo n Va lle y (e a st) 3. Wa sho e Va lle y 4. Sun Va lle y 5. T ruc ke e Ca nyo n (we st) 6. Ple a sa nt Va lle y 7. T ruc ke e Me a do ws 8. Co ld Spring s Va lle y 9. Values indicate averaged ratios of stormwater features to development features by hydro basin

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 o 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

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 ound 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

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  MRPA re g io na l da ta wa re ho use (in c o nve ya nc e in T 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 e ss fro m this initia l a c k pr og r 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 !

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