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I I I I I I I I I I FCC12/ REACH 4, 3 Existing Conditions . Farmer's Ditch contributes baseflow (0.5 cfs . Good primary aquatic habitat ranking . Good aquatic habitat quality ranking . Upstream of 26'" St. exotics (elm ash) dominate canopy, few natives . Downstream of 26th crack willow (exotic) dominant and regenerating . Good riparian habitat vegetation structure ranking . Excellent streambank vegetation stabUlty . Woody plant locations vary from toe to top of bank . Garden cultlvars naturalized In understory . Red fox, mule deer herd, and birds observed at 2611l Sl. bridge . Good tllrrestrl.al Yllrtebrate habitat, limited by lack of base flow above Farmers Ditch Environmental Opportunities via Flood Improvements . Preserve good riparian canopy below Farmer's Ditch crossing . Opportunity to increase flood conveyance, expand riparian terrace, and revegetate with native species Interpretive amenity opportunity on public lands via Integrated design of side channel, sediment basin. and 'oxbow' riparian community Opportunity to combine revegetation with bank stoblllzatlon as-needed Preserve good primary aquatic habitat Potential ditch crosslng reconstruction to remove flood barrier and fish movement barrier Consider options to preserve or replace flows (In-place or upstream) contributed by Former's Ditch Op'portunlty to remove rockwalls and concrete and stabilize banks With bio-engineering +/-) FCC09/ REACH 4 Existing Conditions . Exotics (crack willow) dominate canopy, some portions . Exotics dominate understory . Good streambank vegetation stability . Good riparian structure . Predominantly exotic woody species regeneration, some natives . Stre<1m meanders and frequent floodplain broadens In some areas . Tree and shrub locations vary from toe to top of bank . Beaver activity evident and enhance aquatic FCC11 REACH 4 Existing Conditions . Exotics (elm) dominate canopy . Exotics domfnate understory . Tree and shrub locations vary from toe to top of bank . Excellent streambank vegetation stability . Undeveloped lands provide good cover and feeding areas . Red fox observed In channel . Lawns maintained to channel, limiting wildlife habitat terrace, riparian Environmental Opportunities via Flood Improvements . Opportunity to increase flood conveyance. expand and rellegetate with native species Opportunity to formalize existing pools/drops, habitat and water quality / FCC05/ REACH 5A, 4 Existing Conditions . Native woody overs tory and shrub canopy . Weedy understory Woody plant locations vary from toe to sldeslopes Good stream bonk vegetation stability Undeveloped lots provide refuge for vertebrates Fences inhibit wildlife movement Yard waste degrades visual and habitat quality Environmental Opportunities via Flood ImproYElments . Opportunity to increase flood conveyance, expand riparian terrace, revegetate with natlw species, and enhance wildlife movement Opportunity to formalize existing pOOls/drops, and enhance aquatic habitat and water quality Opportunity to clean up site durln<;{ construction Opportunity to provide Interpretive/aesthetic amenity at public school Opportunity to replace piped stream segment with open channel for habitat enhancement Opportunity to use water quality best management practlce(s) to manage sediment and pollutants Existing Conditions . Exotics dominate canopy . Very weedy understory . Mature trees and good canopy cover . Woody plant locations vary from toe to sldeslopes . Good riparian structure and bird habitat . Good streambank vegetation stability FCC07/ REACH 4 to flood/dredging 5A Existing Conditions . Good cottonwood regeneration on frequent flood terrace due . Exotic woody species regeneration (russian olive and ash) . Weeds, escaped cultivars, and exotics prevalent In understory . V8getatlon, wildlife habitat. and water quality degraded by camping, waste. and yard waste Good streambank vegetation stablllty Mule deer observed Anderson & Compan' eco enviroamlcmtal plllll1ling pili n \andscapo arcbitec1lD1l nl ng rivmioc I 'WCl1amla coasultins Longmonl, co 8OIlO1 303-776-48311 J\L ASSESSMENT" ~ 7-1) MAP PAOE: 7-3 Environmental Opportunities via Flood Improvements . Opportunity to Increase flood conveyance, expand riparian terrace and revegetote with native species Opportunity to combine revegetation with bank stabilization os-needed Opportunity to combine grade control with aquatic habitat enhancement human Environmental Opportunities via Flood Improvements . Opportunity to Increase flood con,^,yance, expand riparian and reve9,etate with native species . Opportunity to combine grade control with aquatic habitat . Opportunity to clean up site during construction . InterpretIve amenity opportunity on public lands via Integrated design of side channel, sediment basin. and 'oxbow' riparian community . Harvest area opportunity at cottonwood forest for project revegetation . Opportunity to use water quality best management practice(s) to manage sediment and pollutants AND MAJOR ORAINAGEWA Y Pl..ANNN3 FOURtJI..E CANYON CFEEK PHASE "A" FEPORT URBAN DRAINAGE AND R..OOO CONTROL DISTRICT CITY OF BOULDER Oote:~ O<Ite:~ Oal.:~ o.l9ned By~ Drawn By.--CIlL- Chedc.d B~ .".....- " -.... ".....,..- ..,., r....'.. ...-- ~ ~ ...,....... - .....,..... --- . ~ ~ ~ I :s: ~ -< ~i ~~ ~J. ;sc:l o Environmental Opportunities via Flood Impro\lements . Opportunity to Increase flood conveyance, expand riparian terrace, and revegetate with native species Potential enhancement of wildlife movement and bank stabilization via riparian expansion and lawn area setback Opportunity to formalize existing pools/drops, and enhance aquatic habitat and water quality Op'portunity to remove rockwalls and concrete and stablllze banks With blo-engineering I I I I I terrace. enhancement I I I I