Fanno Creek Watershed Management Plan Client: Unified Sewerage Agency Completed: 1997 The flood work PWR staff completed for Fanno, Summer, and Ash Creeks was motivated by our previous work developing a comprehensive watershed management plan covering not only flood management but water quality, watershed health and many other characteristics. The plan was developed by PWR staff while at KAI in cooperation with a multi-disciplinary team and a project committee that included public stakeholders.   Our model calibration in this basin used two flow gauges - one far upstream in the watershed, and one near the mouth, and led to important advances in how watersheds should be modeled. These advances were later incorporated into the calibration update of Portland's Johnson Creek. The Fanno Creek management planning project made extensive use of powerful spreadsheet-based model development and QA/QC tools that are unique to Pacific Water Resources, Inc.   In addition, we examined water quality records, simulated pollutant loadings and concentrations with SIMPTM and developed important relationships for TSS and sediment transport and between air and stream temperature. Finally, we used GIS extensively not only to create informative maps but even more to develop model input parameters themselves and to process model outputs into readily understandable form. The management action plan that resulted identified specific water quality and flood management projects along with community based enhancement projects and non-structural project and programs that should be implemented to improve water quality, reduce flooding and restore riparian habitat. Many of the highest priority stream restoration projects identified by the plan have already been designed and constructed.       City of West Linn Stormwater Master Plan Client: City of West Linn, West Linn, Oregon Completed: Ongoing The city of West Linn required a comprehensive update to their existing 1996 Storm Drainage Master Plan. The new Master Plan will account for recent development within the city limits, particularly in the Tanner Creek watershed. This update will emphasize an assessment of the exiting stormwater collection and conveyance systems as well as watershed management for improving water quality. Services included development of GIS coverages of the drainages within West Linn.   The results were used to create a HEC-HMS hydrologic model of the watershed. The HEC-HMS model is used to estimate flow rates and volumes within the system. Computed flows will be used to analyze the capacity of the existing system as well as improvements required. Water quality was modeled using SIMPTM, PWR's unique pollutant wash-off model. Based on water quality modeling results, new and existing maintenance practices were optimized and future water quality facilities identified. All findings and recommendations will be presented in the new master plan. The project has been broken into two phases. The first phase, which has been completed, involved the development of the engineering and natural resources related information and analysis. The second phase involves a public process needed to formulate, evaluate and prioritize the various aspects of the comprehensive management plan. The second phase is currently underway.       Johnson Creek Master Plan Update Client: City of Portland BES Completed: 1998 Principals now with PWR updated the hydrologic and hydraulic models from the comprehensive 1995 Johnson Creek Resource Management Plan (RMP) effort to reflect more recent calibration data and new methods for modeling local runoff, stream channel storage, and split flows through the Lents area. The resulting models provided much improved predictions throughout the watershed and especially through and downstream of the Lents area. Also, they are very similar to the XP-SWMM model that the City later developed, so much of the inputs from this modeling update were used directly. Most of this work was done by Mr. Jelen with support from Mr. Sutherland and Dr. Matin, and made much greater use of spreadsheet automation of modeling and QA/QC processes.     Watersheds 2000 Client: Clean Water Services (formerly Unified Sewerage Agency), Hillsboro, Oregon Completed: 2001 PWR served as the lead firm coordinating water resources GIS and hydrology and hydraulic modeling with two supporting engineering teams and three environmental science teams including our partner Fishman Environmental Services. This $2 million project encompassed over 460 square miles of watersheds and 570 miles of streams and rivers, and spanned much of Washington County in what was probably the largest watershed project of its kind in this state. PWR completed the watershed management planning for about 120 square miles of this - nearly all of the watersheds draining the Portland West Hills to the Tualatin River, including Fanno Creek, Rock Creek (including Beaverton Creek and its tributaries) and several smaller streams, that together drain most of the urban areas of Washington County. HEC-HMS flow models were created for 72-hour winter design storms and can also be used for 24-hour designs or for continuous flow simulations to support wetland hydrology or water quality design. HEC-RAS flood elevation/profile models were completed for over 70 miles of rivers and streams. These tools were used by PWR to evaluate not only hydraulic deficiencies but also fish passage issues for up to 600 identified culverts supporting ESA compliance.     WIRA 25/26 Level 1 Watershed Assessment Client: Lower Columbia Fish Recovery Board Completed: 2002 PWR, as a subconsultant to Economic and Engineering Services, Inc. (EES), has developed an efficient Level I assessment for the Cowlitz and Grays-Elokoman watersheds. This Level I work used existing data and reports to the maximum extent possible. The primary goals were to review existing data and to determine the adequacy of the information for water quality and quantity modeling in two Water Resource Inventory Areas (WRIAs). The focus of this effort was to bring together the data collected with regard to water quantity and create an accounting between known water inputs, losses, and flow among the various hydrologic pathways. A summary of estimated flows / volumes for each of the major hydrologic pathways in both WRIAs has been presented. An assessment of discrepancies identified within the existing databases was performed. A summary of water quality impairment was also presented with an assessment of past trends and present regulatory compliance. Additional work phases that are currently underway will involve the development and calibration of detailed HSPF hydrologic models for several subbasins throughout the study area.