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CHAPTER 2 Regional and Watershed Overview

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CHAPTER 2 Regional and Watershed Overview San Lorenzo Valley Water District Watershed Management Plan, Final Version Part I: Existing Conditions Report CHAPTER 2: OVERVIEW OF DISTRICT LANDS & WATER SUPPLY 2.0 Introduction This chapter begins by providing a regional overview of the Santa Cruz Mountains, followed by a general description of the San Lorenzo River watershed. The chapter then provides a more detailed description of District-owned watershed lands, and an overview of the District’s surface and ground water supplies. It should be noted while reading this overview that significant impacts from climate change are likely occurring throughout the regional, watershed, and landscape scales. Locally, predicted climate change impacts include temperature rise, increased droughts and more intense rainfall events. Chapter 7: Local Climate Change Assessment discusses some of the scientific research and policy recommendation to date, especially in regard to water resources. 2.1 Regional setting: The Santa Cruz Mountains The Santa Cruz Mountains covers an area of 3,592 square kilometers (1,387 square miles) on the central coast. The region is bounded on the north by the Golden Gate, on the east by San Francisco Bay and the Santa Clara Valley, on the south by the Pajaro River and on the west by the Pacific Ocean. The Santa Cruz Mountains is defined as a bioregion, as shown in Figure 2.1. It is acknowledged as one of the more biologically diverse areas in California. Figure 2.1. The Santa Cruz Mountains Bioregion According to the Santa Cruz Mountains Bioregional Council (2007): “The region is essentially one of heavily populated lowlands surrounding a core of forested uplands, with small to large pockets of everything from salt marsh to chaparral intermixed. It is rich in endemics and many other natural features of special interest, some of whose past and current distributions are well known, others hardly at all.” The region’s Mediterranean climate is characterized by relatively cool, dry summers and moderate-to-heavy rainfall in the winter months. Approximately 90 percent of the annual rainfall in the region occurs between November and April. The region is known for its coastal redwoods, Source: Santa Cruz Bioregional Council, 2007 which depend on coastal fog. Streams flowing from the Santa Cruz Mountains drain into the Monterey Bay or the Pacific Ocean. The Monterey Bay was declared a National Marine Sanctuary in 1992. Chapter 2: Overview of the District’s Land and Water 2-1 05/11/2009 San Lorenzo Valley Water District Watershed Management Plan, Final Version Part I: Existing Conditions Report The Monterey Bay Marine Sanctuary is the nation’s largest marine sanctuary, encompassing over 5,300 square miles along the Central California coast. The sanctuary ranges from Cambria, San Luis Obispo County northward to Rocky Point in Marin County. The sanctuary contains some of the world’s largest underwater canyons, important habitats, and some of the most productive and diverse deep ocean waters and floors in the world. 2.2 The San Lorenzo River watershed The District’s surface water and groundwater supplies originate entirely within the San Lorenzo River watershed, depicted in Figure 1.1, is one of the major watersheds in the Santa Cruz Mountains. 2.2.1 Topography Elevation ranges in the watershed from the 3,214 feet at the summit of Castle Rock Peak, down to sea level at the mouth of the river. With its headwaters at an elevation of approximately 2,900 feet, the San Lorenzo River drops 2,000 feet in the first 3 miles (CCRWQCB, 2002). Small, steep tributaries feed the river from the west at Ben Lomond Mountain, while wider, more gently sloping tributaries feed the river from the east and northeast. The San Lorenzo River flows to the north end of the Monterey Bay. Refer to Chapter 3, Hydrology, Geomorphology, and Water Quality for more information about the topography of the watershed. 2.2.2 Climate Annual rainfall varies between 15 inches to more than 100 inches throughout the watershed, depending upon location and year. Ben Lomond Mountain, source of the District’s surface water, averages near the high end of the range. Rainfall averages approximately 46 inches per year in the watershed above Big Trees, but less than that in the remainder of the watershed, down to the beach. Six to ten consecutive days of rainfall is not unusual for the San Lorenzo River watershed (Swanson Hydrology, 2001). Coastal fog is an important part of the summer climate, creeping into inland valleys at night and in mornings. Average daily temperatures vary throughout the watershed, generally ranging from 30o F and 90o F. The lowest temperature recorded at Ben Lomond Station was 15o F, on December 23, 1977, and again on December 22, 1980. The highest temperature recorded at Ben Lomond Station since 1972 was 112o F in October 1996. Refer to Chapter 3: Hydrology, Geomorphology, and Water Quality for more information about the watershed’s climate. Refer to Chapter 7: Local Climate Change Assessment for more information about the probable impacts of climate change on the San Lorenzo River watershed. 2.2.3 Biodiversity The San Lorenzo River watershed supports a wide variety of natural plant communities, which in turn support a diverse range of wildlife species. Plant communities include redwood forests, chaparral, the rare sandhills, grassland, oak woodland and riparian woodland. Many of these plant communities can be found on District-owned lands. Refer to Chapter 4, Biotic Resources for more information about the biodiversity of the watershed. Approximately 26 miles of the San Lorenzo River, and at least nine of its major tributaries, support steelhead (Oncorhynchus mykiss). Historically, the San Lorenzo River supported the largest coho salmon and steelhead fishery south of San Francisco Bay, and the fourth largest Chapter 2: Overview of the District’s Land and Water 2-2 05/11/2009 San Lorenzo Valley Water District Watershed Management Plan, Final Version Part I: Existing Conditions Report steelhead fishery in the State of California (County of Santa Cruz, 2001). Coho salmon and steelhead of the San Lorenzo River are listed as endangered and threatened, respectively, under the federal Endangered Species Act. Coho salmon had not been recorded in the watershed since the early 1980s (Smith, 1982), until 2005, when at least a dozen adult coho were observed at the city of Santa Cruz Felton diversion fish ladder. Refer to “Appendix A: Fisheries” for more information about steelhead and coho salmon in the San Lorenzo River watershed. 2.2.4 Geology and soils The tectonic compression of the earth’s crust that originally produced the Santa Cruz Mountains continues to shape the region, the San Lorenzo River watershed, and the District’s watershed lands. The San Andreas Fault runs parallel to the northeastern boundary of the watershed. Along this fault, two major tectonic plates meet: the Pacific Plate to the west and the North American Plate to the east. Throughout geologic history, major events along this plate boundary have helped create the unique geology and topography of the San Lorenzo River watershed. The watershed itself is divided by two faults--the Zayante and the Ben Lomond faults--into three areas of distinct geology, topography, soil and groundwater characteristics. The Zayante Fault divides the watershed in half, running approximately east-west. The Ben Lomond Fault runs south to north along the San Lorenzo River until it meets the Zayante Fault. Refer to Chapter 3, Hydrology, Geomorphology, and Water Quality for more information about the geology and soils of the watershed. 2.2.5 Human uses in the San Lorenzo River watershed This section describes the prominent human uses throughout the San Lorenzo River watershed, including development, timber, mining, water extraction, farming and ranching, recreation and tourism, and open space. 2.2.5.a Development The watershed is home to approximately 41,000 residents inhabiting 17,174 developed parcels, outside of the City of Santa Cruz (County of Santa Cruz, 2001). Approximately 3,150 of the developed parcels are within the City of Scotts Valley (County of Santa Cruz, 2001). The County has influenced the quality and rate of development through planning, zoning ordinances, and regulations. The result has been that the San Lorenzo River watershed retains many of its aesthetic characteristics and viewsheds. The San Lorenzo Valley was sparsely inhabited and dominated by summer homes through the 1950s. Since then, houses within the watershed have been converted to permanent residences and some 3,300 new units were built by the 1970s (County of Santa Cruz, 2001). The County (2001) reports that, “Growth rates of over 30% occurred in Bear Creek, Upper Zayante, Bean Creek, and Branciforte.” Scotts Valley also experienced an increase in development of 80% from 1980 to 2000 including large industrial complexes (County of Santa Cruz, 2001). According to the Santa Cruz County Draft Watershed Management Plan (2001): The overall growth rate in the watershed outside Scotts Valley was 17%. In the 1990s, growth in Scotts Valley was greater than in the remainder of the unincorporated watershed. High rates of development in the Scotts Valley area Chapter 2: Overview of the District’s Land and Water 2-3 05/11/2009 San Lorenzo Valley Water District Watershed Management Plan, Final Version Part I: Existing Conditions Report resulted in erosion of sandy areas, paving of groundwater recharge areas, and increased pumping of groundwater.” The rate of development has slowed more recently. Early development in the watershed filled most of the flatter areas and lined most creeks, replacing valuable riparian habitat and damaging the riparian ecosystem before environmental regulations were in place. Much recent development has been in more remote, steeper areas of the watershed. Development increased the extensive road network initiated by historical logging.
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