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Seattle, WA, United States

Lancaster A.,Herrera Environmental Consultants Inc.
Low Impact Development 2010: Redefining Water in the City - Proceedings of the 2010 International Low Impact Development Conference | Year: 2010

As a part of the new NDPES permit requirements, the Washington State Department of Ecology has introduced flow duration standards for creek protection that require the use of continuous simulation hydrologic modeling. The new permit also requires the use of low impact development (LID) best management practices (BMPs) to the maximum extent feasible. To address these complex regulations, a tool was developed to simplify the sizing of pre-designed LID BMPs for jurisdictions in western Washington. This tool allows the designer to size BMPs without extensive calculations or continuous modeling, and can streamline agency review of design submittals by providing "rule of thumb" sizing equations. By providing pre-designed and pre-sized LID BMPs, this tool helps reduce barriers to LID implementation in western Washington. This paper presents the modeling methods and resulting LID BMP sizing tool for Kitsap County, Washington. Similar methods will be used in 2010 and 2011 for a grant-funded effort to develop a regional tool for all lowland areas in western Washington. © 2010 ASCE. Source


Ballek L.J.,Herrera Environmental Consultants Inc. | Dunlap S.,Atlantic Richfield Company
28th Annual Meeting of the American Society of Mining and Reclamation 2011 | Year: 2011

The Opportunity Ponds Wetlands project is a 2.2 km 2 (544 acre) manmade wetland located 5 km (2.4 miles) east of Anaconda, Montana. A 0.9 km 2 (222 acre) area of wetland was planted in 2009, and a 0.65-km 2 (161 acre) area was planted in 2010. Careful design, excavation, site shaping, and diligent quality assurance have resulted in exceptional plant establishment. The area west of the wetland site was used as a repository for tailings from the smelting of copper ore. Remediation of the repository includes capping the tailings with soil material obtained from nearby borrow areas. The Opportunity Ponds Wetlands are being developed on depleted borrow areas. The goal of the Opportunity Ponds Wetlands revegetation is to create functional vegetation communities that reflect natural wetland habitats. Revegetation plans correlate to the topography and hydrology that have been established. Plants utilized are species observed within native wetland areas close to the site, and plant communities are arranged in "planting zones". Seed for plant production is collected locally and plants are grown under contract by a native plant nursery. Stringent specifications for plant production and placement were developed with EPA oversight. Planting and maintenance activities continue at the site, with final planting to be concluded in 2011. The survival of the 2009 and 2010 plantings has been very good and the water fowl and wildlife use is increasing. Preliminary monitoring results indicate that this project will achieve the goals of providing valuable cover material and creating valuable wetlands for habitat and mitigation. Source


Fontaine M.M.,Herrera Environmental Consultants Inc. | Steinemann A.C.,University of California at San Diego | Steinemann A.C.,University of Colorado at Boulder | Hayes M.J.,University of Nebraska - Lincoln
Natural Hazards Review | Year: 2014

Drought preparedness programs are considered a primary defense against drought hazards. This article investigates state drought programs in the western United States, including a review of drought plans and interviews with state drought officials. While nearly all states have developed drought plans and larger drought programs, the scope and depth of these programs vary widely. State programs and plans typically address monitoring, declaration and response, and communication and coordination. Yet few states conduct postdrought assessments or impact and risk assessments. Resources tend to be allocated more for drought response than mitigation. Officials emphasized not only the importance of available monitoring data, but also the need for improved information for monitoring and predicting drought. State drought officials recommended the following: (1) clear and relevant drought indicators and triggers; (2) frequent communication and coordination among state agencies, local governments, and stakeholders; (3) regularly updated drought plans; and (4) strong leadership that includes a full-time state drought coordinator. © 2014 American Society of Civil Engineers. Source


Skaugset A.,Oregon State University | Surfleet C.,Oregon State University | Meadows M.,University of the Sierra | Amann J.,Herrera Environmental Consultants Inc.
Transportation Research Record | Year: 2011

Forest roads can be a source of accelerated erosion, which can be detrimental to aquatic habitat, fish, and other aquatic biota. Erosion models are increasingly used to quantify sediment production from forest roads. This project evaluated the efficacy of these models to predict erosion from forest roads. Sediment production was measured from 44 road segments in the humid, temperate rain forests of Oregon and California. Sediment production from these road segments was estimated with four contemporary erosion models: the Washington Road Surface Erosion Model (WARSEM); Sediment Model 2 (SEDMODL2); WEPP: Road, an interface for the Water Erosion Prediction Project Model; and the revised universal soil loss equation (RUSLE). The erosion models consistently overestimated the amount of sediment produced by the road segments by 2 to 8 times. The results were highly variable, and there were considerable differences in erosion estimated by the four models, even for the same road segment. Further, the erosion models could not consistently identify the road segments that were the top sediment producers. It is hypothesized that the regionalized parameters used as inputs for the models do not adequately characterize the hydrology of the individual road segments. In the humid, temperate rain forests of the Pacific Northwest, surface erosion from forest roads is best predicted by the amount of runoff from the road during storms. Thus, research that will better quantify the hydrology of forest roads will provide better information to predict surface erosion from forest roads. Source


Major J.J.,U.S. Geological Survey | O'Connor J.E.,U.S. Geological Survey | Podolak C.J.,Johns Hopkins University | Keith M.K.,U.S. Geological Survey | And 9 more authors.
US Geological Survey Professional Paper | Year: 2012

The October 2007 breaching of a temporary cofferdam constructed during removal of the 15-meter (m)-tall Marmot Dam on the Sandy River, Oregon, triggered a rapid sequence of fluvial responses as ∼730,000 cubic meters (m3) of sand and gravel filling the former reservoir became available to a high-gradient river. Using direct measurements of sediment transport, photogrammetry, airborne light detection and ranging (lidar) surveys, and, between transport events, repeat ground surveys of the reservoir reach and channel downstream, we monitored the erosion, transport, and deposition of this sediment in the hours, days, and months following breaching of the cofferdam. Source

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