Comprehensive Creek Planning Initiative Boulder County Susta ining Co lo ra do Wa te rshe ds Co nfe re nc e Oc to b e r 8, 2014
Watershed Recovery Future Creek Long ‐ Term Immediate Emergency Projects Vision Threat Response Assessment and Mitigation Funding and Watershed Implementation Master Plans
Boulder County Watersheds
Roads and Bridge s 10 c o unty b ridg e s we re se ve re ly da ma g e d • o r de stro ye d 118 priva te c ro ssing s (b ridg e s o r c ulve rts) • we re da ma g e d o r de stro ye d 140 mile s o f c o unty ro a ds we re da ma g e d o r • de stro ye d Immediate Threat and Emergency Response Damage Assessment and Mitigation Total Estimated Cost for Public Road and Bridges: $128,179,680
Wate r ways Alig nme nt o f the c re e ks c ha ng e d in ma ny • lo c a tio ns—so me time s dra stic a lly Ma ny po nds we re b re a c he d • L a rg e a mo unts o f se dime nt de po site d in • c re e ks Ba nk e ro sio n a nd insta b ility • E xte nsive da ma g e in c re e ks o n priva te la nds • Immediate Threat and Emergency Response Damage Assessment and Mitigation Total Estimated Cost for Waterways Projects on Public Lands: $29,279,435
Compr e he nsive Cr e e k Planning Initiative • I nitia te d to e nsure c o unty-wide vie w o f c re e k re c o ve ry a nd re sto ra tio n • Be g a n with c o mmunity me e ting s to ide ntify ne e ds Immediate • Mo ve d to hig h-ha za rd de b ris Threat and Emergency Response re mo va l a nd mitig a tio n pro je c ts Damage Assessment • Pre pa re d fo r a nd tra nsitio ne d to and wa te rshe d-le ve l ma ste r pla nning Mitigation pro c e ss
Community Engagement • Ove r 650 pa rtic ipa nts Immediate Threat and Emergency Response Damage Assessment and Mitigation
Information Clearinghouse Immediate Emergency Threat and Response Damage Assessment and Mitigation
County ‐ wide Evaluation 208 site s we re ide ntifie d re q uiring fo llo w- • up a nd re c o ve ry me a sure s. Immediate Emergency Threat and Response Damage Assessment and Mitigation
High Hazar d De br is Re moval Immediate Threat and Emergency Response Damage Assessment and Mitigation Total Estimated Cost for High Hazard Projects: $2,869,201
Boulde r County Maste r Plans Activity St. Vrain Left Hand Fourmile Creek Creek Creek Coalition Convened Community Process Initiated Ecological Assessment Geomorphic Assessment Long ‐ Term Hydraulic Model October Vision Emergency Flood Hazard Areas Identified October October October Response Watershed Draft Alternatives October October Master Plans Draft Plan October October October Feedback on Draft Plan October October November Plan Finalized November November December N/A Complete Upcoming
St. Vr ain Cr e e k Long ‐ Term Vision Emergency Response Watershed Master Plans
St. Vr ain Cr e e k Coalition 8 a g e nc ie s • Me e ting twic e pe r mo nth to g uide • de ve lo pme nt o f pla n Community E ngage me nt Long ‐ Term Vision 2 kic k-o ff me e ting s in June - 200 • Emergency pa rtic ipa nts Response Watershed I ndividua l a nd ne ig hb o rho o d me e ting s • Master Plans thro ug ho ut study 4 re a c h-spe c ific c o mmunity wo rksho ps • fo r fe e db a c k o n a lte rna tive s- 140 pa rtic ipa nts F ina l wo rksho p in No ve mb e r to re le a se • pla n
St. Vrain Creek Ecological Assessment E va lua tio n o f the o ve ra ll c o nditio n o f stre a ms, ripa ria n zo ne s, a nd in-stre a m ha b ita t Main ste m= F air to Good Nor th St. Vr ain= F air to Good South St. Vr ain= Poor to E xc e lle nt
St. Vrain Creek Ecological Assessment Recommendations: Consider opportunities for Poor improved meanders, habitat, vegetation, etc.; need to create more complexity within the channel No further management Excellent recommended
St. Vrain Creek Geomorphic Analysis Rapid Ge omor phic Asse ssme nt De fine po st-flo o d g e o mo rphic c o nditio ns in the St. • Vra in syste m Supple me nt a n o ve ra ll unde rsta nding o f the • dyna mic s o f the St Vra in Cre e k Assist with fo c using o n g e o mo rphic a lly a ppro pria te • flo o d risk re duc tio n a nd re sto ra tio n stra te g ie s Channe l Migr ation Zone Mapping A c ha nne l mig ra tio n zo ne (CMZ) re fe rs to the a re a • a stre a m ha s o c c upie d in re c e nt histo ry Sho ws whe re a stre a m ma y mig ra te thro ug h a g a in •
St. Vrain Creek Geomorphic Assessment Reference Stream C4 Type Existing Stream Type C4 Reference Bed Form Riffle ‐ pool Existing Bed form Plane bed Departure Type Bed form change due to straightening. Channel Evolution II ‐ III Stage Channel Processes Reach has been historically straightened and channel adjustments are limited due to armoring. Significant overbank flow and aggradation occurred during the September 2013 flood but post flood dredging and berming largely returned the channel to its pre ‐ flood location. The bed lacks well ‐ defined riffle ‐ pool features and is predominately a transport reach during most events. Sediment Regime Unconfined Source & Transport
St. Vrain Creek Channel Migration Zone Map
St. Vrain Watershed Alternatives Alternatives Split channel • Channel realignment • Minor channel stabilization • 100 ‐ Year flood control • channel 100 ‐ Year flood control • channel with low flow channel Alternatives (cont.) Site ‐ specific projects • Stream restoration • Infrastructure • improvements only
L e ft Hand Cr e e k Long ‐ Term Vision Emergency Response Watershed Master Plans
L e ft Hand Cr e e k Coalition Ove r 20 a g e nc ie s, c o mmunity • o rg a niza tio ns, wa te r inte re sts Me e ting twic e pe r mo nth to g uide • de ve lo pme nt o f pla n Long ‐ Term Vision Emergency Community E ngage me nt Response 2 K ic k-o ff me e ting s in July/ Aug ust- Watershed • Master Plans 150 Pa rtic ipa nts Me e ting s with individua ls a nd • ne ig hb o rho o ds while in the fie ld 2 a dditio na l c o mmunity me e ting s in • Oc to b e r fo r dra ft pla n fe e db a c k
Left Hand Creek Ecological Assessment E va lua tio n o f the o ve ra ll c o nditio n o f stre a ms, ripa ria n zo ne s, a nd in-stre a m ha b ita t. L owe r L e ft Hand=Poor to F air Uppe r L e ft Hand=F air to Good
Left Hand Creek Geomorphic Assessment Ge o mo rphic ha za rds in the L e ft Ha nd Cre e k wa te rshe d a re e xte nsive , b ut a ppe a r q uite diffe re nt in the uppe r a nd lo we r wa te rshe ds. Uppe r L e ft Ha nd Cre e k L o we r L e ft Ha nd Cre e k Ge o mo rphic ha za rds • Ge o mo rphic ha za rds a re • a re a re sult o f: the re sult o f: de b ris flo ws, ja ms o ra pid a g g ra da tio n o c ha nne l a vulsio n a nd o a vulsio n e xpa nsio n o e xpa nsio n o Ha za rds c o nsist o f: • flo o dpla in de po sitio n o de stro ye d b a nks o Ha za rds c o nsist o f: • unsta b le pe rc he d c ha nne ls o unsta b le he a dc uts b o ulde r b e rms o o b a nk fa ilure o e xte nsive flo o dpla in o de po sitio na l fe a ture s suc h a s de po sitio n o se dime nt slug s a nd b a rs Stra te g ie s to a ddre ss the se risks invo lve b a nk, c ha nne l, a nd flo o dpla in sta b iliza tio n. E ne rg y dissipa ting fe a ture s a re pro po se d fo r hig he r e ne rg y re a c he s, while flo w a c c e le ra tio n in lo we r g ra die nt re a c he s will b e e nc o ura g e d to pro mo te se dime nt tra nspo rt a nd the e sta b lishme nt o f a lo w-flo w c ha nne l.
Left Hand Creek Geomorphic Assessment
F our mile Cr e e k Long ‐ Term Vision Emergency Response Watershed Master Plans
F our mile Cr e e k Coalition Co o rdina te d with the Bo ulde r Cre e k • Wa te rshe d Co a litio n with UDF CD a nd o the r c o mmunitie s Long ‐ Term Vision Community E ngage me nt Emergency Response K ic k-o ff me e ting in Se pte mb e r- o ve r • Watershed Master Plans 50 Pa rtic ipa nts Me e ting s with individua ls a nd • ne ig hb o rho o ds while in the fie ld 2 a dditio na l c o mmunity me e ting s in • No ve mb e r
Fourmile Creek Modeling
Fourmile Creek Modeling
L owe r Boulde r Cr e e k Long ‐ Term Vision Emergency Response Watershed Master Plans
L owe r Boulde r Cr e e k • F unding a g re e me nt de ve lo pe d with Urb a n Dra ina g e a nd F lo o d Co ntro l Distric t (UDF CD) • Co a ltio n pa rtne rs inc lude c ity o f Bo ulde r, c ity o f L o ng mo nt, Bo ulde r Long ‐ Term Co unty Vision Emergency • Re q ue st fo r Pro po sa ls (RF P) re le a se d Response Watershed • Co nsulta nt se le c tio n b y e nd o f Master Plans Oc to b e r Co o rdina te d with the F o urmile Cre e k • study, We ld Co unty c o mmunitie s, St. Vra in ma ste r pla n
E nabling F lood Re c ove r y thr ough Wate r she d Planning • Par tne r ships o Co a litio n pa rtne rs o Co mmunity me mb e rs & la ndo wne rs o Sta ke ho lde r inte re sts • Re sour c e s o Co unty: Sta ffing a nd funding Emergency Long ‐ Term Response Recovery o Sta te : Guida nc e a nd funding • CWCB Ma ste r Pla n Gra nt • CDBG-DR Pla nning Gra nt • CWCB Stre a m Re sto ra tio n Gra nts * F unding ne e de d fo r pro je c t imple me ntatio n, inc luding lo c al matc h
Recommend
More recommend
