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Phillips Creek Basin Plan

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Phillips Creek Basin Plan Volume III Port Gardner Bay Watershed Plan Chapter 7 Phillips Creek Basin Plan Chapter 7—Phillips Creek Basin Plan 7.1 Basin Characteristics The characteristics of the Phillips Creek basin in terms of water flow, water quality, and habitat together with identified issues are described in this section. The characterization work in part made use of previously prepared documents, data, and reports which are listed in Appendix 1. A. General Characteristics Physical Characteristics: Phillips Creek is a small stream system in the Puget Lowlands, running in a roughly south-north direction and discharging into Port Gardner Bay in the Puget Sound. It travels through a 0.13 square mile drainage basin along a total stream length of approximately 1.4 miles. The basin is shown in Figure 7-1. Phillips Creek has a lower main stem segment that extends up from the Burlington Northern Santa Fe Railway (BNSF) culvert for approximately 1,000 feet, at which point the West Fork Tributary diverges from the main stem and continues until 49th Place SW. The main stem continues upstream and stops north of Merrill Creek Parkway near the Millington at Merrill Creek apartment complex. Portions of the system are undeveloped forested area and the remaining area is residential. A majority of the creek flows through an open channel system through a forested ravine with sections of pipe at road crossings. The headwaters of the basin reach a maximum elevation of 420 feet and ground elevation at the downstream end of the BNSF culvert is approximately 7 feet. The maximum relief of the basin (defined as the difference between the maximum and minimum basin elevations) is 414 feet. Dividing the maximum relief by the length of the basin along Phillips Creek main channel (roughly 5,930 feet), makes the overall basin gradient approximately 7 percent; however, this gradient is considerably greater as the creek descends the marine bluff to Port Gardner Bay. Topography throughout the basin is steep and all of the developed area is residential. Existing land cover within the basin is shown in Figure 7-2. Riparian habitat in Phillips Creek system is along the banks of the system. Stream habitat, where the system is daylighted, is moderately impacted by land use activities and drainage modifications. Phillips Creek descends through a steep, forested ravine from its upper basin into its lower basin and down the marine bluff that faces Port Gardner Bay. The valley walls are extremely steep in this ravine with side slopes ranging between 25 and 45 percent throughout the stream channel. The Phillips Creek basin is largely forested, and the steep slopes of the ravine have precluded the encroachment of development as seen throughout the basin along the creek channel. Complete fish passage barriers exist as the system descends the marine bluff, with gradients in excess of 20 percent and cascades and water drops of 6 feet or greater in height. High levels of fine sediments in the lower portion of the Phillips Creek system have also been identified as habitat impairments. Woody debris and fine sediment are supplied to the channel in periodic pulses from failures along the valley wall; introduction of sediment into the stream from valley wall failures appears to cause localized reductions in stream bed slope. Channel segments upstream from road crossings may also have lower stream bed slopes as a result of lower sediment conveyance capacity and aggradation of sediment in the vicinity of the upstream culverts. Soils: Soils in the Phillips Creek basin are mostly gravelly sandy loams derived from glacial parent materials. The dominant soil types for hydrologic modeling in the Phillips Creek basin City of Everett Surface Water Comprehensive Plan 7 - 1 Volume III—Port Gardner Bay Watershed Plan November 2017 Chapter 7—Phillips Creek Basin Plan include till and outwash. The distribution of these soil types within the Phillips Creek basin are shown in Figure 7-3. Till soils are from the Alderwood soil series and outwash soils are from the Everett soil series. Existing Land Use: Land use in the Phillips Creek basin under existing conditions is all residential. The north part of the basin is zoned as suburban residential. The southern portion of the basin from Merrill Creek Parkway to approximately the 5100 block is zoned as multi-family, medium density. The total effective impervious area (impervious areas draining to a conveyance system via sheet flow or discrete conveyance) for the basin is approximately 28 percent (21.6 acres), with 35 percent (27.8 acres) of the basin covered with lawns, and 37 percent (29.0 acres) covered with trees. This estimate was based on aerial photography from 2011. Future Land Use: The future land use (ultimate build out) was based on a process that determined the residential parcels that could be developed in the basin and then calculated a percent impervious based on the 2009 City of Everett Growth Management Comprehensive Plan Land Use Maps. Another process was used to calculate increase in imperviousness from short plat developments of small parcels to get a worst case buildout scenario. All other parcels with other designations remained the same as existing land use. In general, the percent of land that is impervious increased within the Phillips Creek basin under future conditions. B. Water Flow Characteristics The key water flow characteristics for the basin are defined by the hydrologic and hydraulic processes at work in the basin, peak and seasonal flow rates, and the existing stormwater infrastructure within the basin. Hydrologic and Hydraulic Processes—Upland Processes Potential Evapotranspiration Evaporation is a major factor in the hydrologic cycle. The Phillips Creek basin receives approximately 40 inches of precipitation each year. Of these 40 inches, approximately half returns to the atmosphere as evaporation or transpiration (Snohomish County North Creek Drainage Needs Report [DNR] No. 10, 2002). Most precipitation intercepted by vegetation transpires, and is accounted for as evaporation. The amount of water lost to evaporation versus transpiration is nearly impossible to distinguish, so they are usually grouped together as potential evapotranspiration (PET) in the HSPF model. Infiltration/Soil Moisture Capacity The type of soil within the basin drives the amount of precipitation that can infiltrate and what happens to the infiltrated water. Infiltrated water can be stored, lost to deep infiltration, or delivered to a stream as shallow groundwater. Within the lower ravine portion of Phillips Creek, groundwater is expressed at the geologic formation interface between the Esperance Formation and Whidbey Formation layers. The Esperance Formation is an advance outwash and is highly permeable while the Whidbey Formation is a nearly impermeable till soil and lies below the Esperance Formation. Till soils associated with the Whidbey Formation interglacial unit contain some clay and is associated with a number of large deep-seated landslides. 7 - 2 City of Everett Surface Water Comprehensive Plan Volume III—Port Gardner Bay Watershed Plan November 2017 SURFACE WATER COMPREHENSIVE PLAN FIGURE 7-1 PHILLIPS CREEK BASIN MAP O u nd LY n S o M o P si I s R C se D B s F LV o CITY OF EVERETTIF D L P C AVE 2014 NA RO AD M BLVD EO ILT K U R I M D G W E M O NT D R O BLVD KILTE MU AVE SEAHURST N PL W GIBSO DULL PL E G L N V E L N R 1 A H BAYVIEW LN O A W D 21ST DR B !( 2 V TAYLOR DR R BAILEY AV E A !( O EN H 3 !( O DR B E W LV Glenwood Creek Basin N ED E E R R L E D A G V N E E V A H N N A ENGLAND E R AV L 2 B E G 3 E W R C 49TH PL SW D K A H AV V A EW E R Narbeck Creek Basin B O T AVE SEAHURST L R S P L R 49TH PL SW N E S HILLSIDE LN V W L O P E O D Merrill & Ring Creek Basin N V H L h A C DGEM R I E O O N i T H l 9 l i S p E A s V C I E W r N e W A A R Y e 51ST PL SW B E k 15 ST PL SW VIEWCREST AVE C K M A V E 2 a 3 R D i n A S W V 5TH ST E 5 W S ST SW t 55 TH TH ST SW 56 e m W 57 E TH V ST A SW H 9 T W 5 T R 2 1 H 0 D T D H R H W D 8 T R W E G V W A L H E T 3 N 1 W O O 59TH ST SW D A S 6 V E 0TH ST SW E A H U R S T A V W E R D D R 3 2 Phillips Creek Basin MERRILL CREEK PKWY A INDUSTRY ST S S Subbasin Boundary O R C D IA D T O E O D Wetlands W B L N V E D Habitat Observations K HARDESON RD !( !( !( Survey Reach Contour 20 ft Disclaimer: The information shown in this map is assembled GIS data created and³ acquired by Otak Inc., City of Everett, and from Snohomish County GIS. This data is not to survey accuracy and is meant for planning purposes only. FLU WY K ES DR 0 500 1,000 2,000 SHUKSAN WAY Feet SIEVERS-DUECY BLVD G:\Projects\SWCP_Port_Gardner\BasinMaps\PhillipsCreek_BasinMap.mxd Chapter 7—Phillips Creek Basin Plan PAGE INTENTIONALLY LEFT BLANK.
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