EXH1305052548

Embankment Fill Modeling in Support of Low Streamflow Analysis Pmpa_ fc_, Port of Seattle P.O.Box 68727 Seattle, WA 98168 Preparedby: Pacific Groundwater Group 2377 Eastlake Avenue East,,#200 Seattle, WA 98102 • (206) 329-0141 ' www.pgwg.com November 27, 2001 JE0105 AR 052549 Sea-Tac Third Runway Embankmenl Fill Modeling Table of Contents 1. INTRODUCTION ................................................... 1 I. I Scope and Approach....................................................................................................................... ! 2. EXTENT OF F1LLMOD_ BY HYDRUS-SLICg ............................... 3 2.1 GeoLulphicExtent of Fill............................................................................................................... 3 2.2" Thickness of Fill ............................................................................................................................ 3 2.3 B_m Boundari_ andAreaCalcul_ons ........................................................................................ d 3. MODELING OF INFILTRATIONWITH RUNOFFANDEVAPOTttANSPmATION....... 4 3. l HSPFInputandRunoffC._iculatiom............................................................................................ 4 Effective Recharge......................................................................................................................... 6 4. MODgtJNG OF VERTICAL FLOW THROUGH EMBANKMENT lqu .............. -........... 6 4.1 Summary.ofGtmm¢ HydrusModel ............................................................................................. 6 4.2 Chamctmzabon of Fill as Soil.................................................................................................... 6 4_..1 GeneralFill ............................................................................................................................. 7 4.2.2 Type l Fill .............................................................................................................................. 7 4.3 Repres_taxion of Fill in Hydrus................................................................................................. 7 4.4 SpqriJlDiscrebzmon of HydrusModels ................................................................................... 9 4.5 Temporal Discr=iz_on ............................................................................................................... 9 4.6 _-sutts............................................................................................................................................9 5. MODELING SATURATED FLOW BENEATH _ EMBANKMENT FILL ............ 10 5.1 Cross Section 1 and Slice I ........................................................................................................... 12 5.2 Cross Section 2 and Slice 2........................................................................................................... 12 5.3 Cross Section 3 and Slice 2...................................................................................................... ..... I2 5.4 IndividualSlice Model Results..................................................................................................... 13 5.5 Methodfor Intetu'atingSlice Results OverEntireFill Areas ........................................................ 14 5.6 Effective Bum Width for Walker Creek...................................................................................... 15 5.7 Effective Basra Widthfor MillerCreek........................................................................................ 15 5.8 Integrated Flow Estimates for Walker Creek Fill ......................................................................... 16 5.9 Intetu'atod Flow_ for Miller CreekFill ........................................................................... 16 - 5.10 Use of IntegramflFlow Estinmtes ................................................................................................. 17 6. REFERENCES.......................................................................................... 17 Pagei AR 052550 Sea-Tac Third Runway Embankment…

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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 [...]