EXH0576023777

RE: Implementation Plan for the Des Moines Creek Flow Augmentation Facility Enclosed is an Implementation Plan for the Des Moincs Cm_k Flow Augmcatation Facility. The facility h proposed to Mdr_ss instream flow and tcmpcralxLreissues during summer low flow conditions. Th_ phm shows the locat.iom of the various facilities (w_11,pipelines, introdu,_on point and monitoringstation) associated with the flow augmentation proposal If you have any questions regarding the implcmemafion plan, Please contact me at 206/988-:i528 or smith-k_omeattl_.org. iTZ" Kcith R, Smi_ Wat_ Resour_ Manager Atta$hn_nt co: Elizabeth Leavitt, P0S David Masters, King County Seattle -Tacoma International Airport P.o._ _ AR 023777Suf_. VIA_fM U.$.A,70_43a FAX_ t.3_.,5_12 8) _DesMohtes Creek Flow AnEmeetRtio_ lmplemeatati?n Plan The Des Moines Creek Basin Planning Committee, comprised of the cities of SeaTac attd Des Moines, King County, the Port of Seattle, and the Washington Department of Transportation, have proposed several projects to enhance the Des Moines Creek watershed. One of these proposalsisa flowaugmentationfacility.There aretwo goalsassociatedwith the-flow augmentationfacility:increasingstreamflowto one cubicfootpersecondduringlo_,"flow periods,anddecreasinginstrearntemperaturesto16 degreesCelsiusduringsummer ]o_,flow periods.By introducingcoolwatertothestreaminmid-tolatesummer,bothofthesego._Iscan bemetandwaterqualityandaquatichabitatshouldbeimproved. The preferredoptionisto use waterfrom a Port--ownedwellto providewaterforflow augmentation.The welliscurrentlyusedtoirrigatea tenant-operatedgolfcourse.The w,:llhas a waterrightcertificatefor400 gallonsperminute(0.88cfs),whichissufficienttoobt_'nthe targetstreamflowofonecfs.An applicationtochangethewaterrighttoallowthepropos,:duse was filedwiththeDepartmentofEcologyinJune2000andiscurrentlyunderreview. Figurei,fromthereport"DesMoinesCreekFlow AugmentationPlan",by Parmnterix,Inc., datedAugust 1998,shows the layoutof the variousfacilitiesassociatedwith the flow augmentation project. The wellhead and pllrnp, located near south 200_ Street, will be reconfigured to discharge into an eight-inch PVC pipe. The pipe will convey water fro,'rithe wellapproximately800 feetnorth,tothepointwhereitwillbe introducedtothecree;_just downstreamoftheconfluenceoftheeastand westbranches.The pipewilldischargei:Itoa manhole-typestructure,whichwillactasastillingbasin,followedbya 20-footchannelof:,mall riprap quarryspalls leading to the stream. Water cascading down the rock channel would ;_ate the water before it enters the…

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PSCAA Advisory Council Meeting Agenda
Add to CalendarMWednesday Mar 11, 9:00am - 11:35am
1904 3rd Avenue, Suite 105, Seattle, WA 98101
Call to order – Roll Call – Quorum Established – Land Acknowledgement We would like to acknowledge that our Agency operates in four present-day counties, which are the traditional lands of the Coast Salish people, past and present. This acknowledgement does not take the place of authentic relationships with indigenous communities in our jurisdiction and [...]