Economic tradeoff between domestic well impact and reduced agricultural production with groundwater drought management: Tulare County, California (USA), case study

Formal policy analysis can aid resource management where groundwater is used intensively. Approaches for developing equitable and effective pumping allocations for drought are evaluated in the context of the 2012–2016 drought in Tulare County, California, USA. Potential economic impacts of policy alternatives on two user groups with conflicting interests are considered. Tradeoffs between losses of agricultural profit and response costs for domestic wells that run dry are estimated for various maximum groundwater depth policies. A welfare maximizing approach for identifying policies that limit depth to groundwater is evaluated and found to be ineffective because agricultural opportunity costs are much larger than domestic well costs. Adding a fee for additional drought groundwater pumping is proposed as a more impactful and balanced management policy approach. For the case study presented, a fee range of $300 to $600/acre-foot ($300–$600/1,233 m3) yielded an effective groundwater management policy for reducing domestic well impacts from drought and balancing agricultural impacts of drought with the need to replenish additional drought pumping in wetter years. Recent management policies enacted in the study area agree with this finding. These results may provide a useful perspective for analytically examining and developing groundwater management policies near the study area and elsewhere.

Spread of Citrus Tristeza Virus in Citrus Orchards in Central California

In California, citrus tristeza virus (CTV) is regulated by a State Interior Quarantine. In CTV abatement districts in central California, trees with CTV that react to MCA13 (MCA13-positive [MCA13+]), a strain-discriminating monoclonal antibody, are rogued to prevent virus spread. The Tulare County Pest Control District, however, does not participate in this abatement program except for a 1.6-km2 zone around the Lindcove Research and Extension Center, Exeter, CA. To quantify CTV spread under these two disparate management programs, CTV surveys were conducted in abatement plots with mandatory aphid control and nonabatement plots. Abatement plot surveys used hierarchical sampling of 25% of trees with samples pooled from four adjacent trees. Detection of MCA13+ CTV in a sample prompted resampling and testing of individual trees. From 2008 to 2018, incidence of CTV increased by an average of 3.9%, with only two MCA13+ samples detected. In contrast, in nonabatement plots, incidence of CTV increased by an average of 4.6% between 2015 and 2018. Increase in MCA13-negative (MCA−) isolates was 11 times greater than that of MCA13+ isolates, with the number of MCA13+ trees increasing by 19 trees between 2015 and 2018. MCA13− isolates were more randomly distributed, suggesting primary spread, whereas MCA13+ CTV isolates were more aggregated, suggesting some secondary spread. These results suggest that spread of MCA13+ isolates was limited by a combination of tree removal and aphid vector suppression. MCA13+ samples were VT isolates with some mixtures with T30 isolates. Despite the presence of VT isolates, all CTV-infected trees were asymptomatic.

Seeking Kaweah

This chapter focuses on a single intentional community, the Kaweah Co-operative Commonwealth, that attempted to establish a socialist alternative to corporate monopoly and labor exploitation in late nineteenth-century Tulare County, California. Employing the scaled archaeological view presented in the preceding chapters illuminates different aspects of the group's attempts to built a better society. The Kaweah Colony's major landscape modification effort, a road to access timber resources, became a backbone of their settlement pattern in the mountainous terrain. Their tent village of Advance was built to provide families with basic services such as a communal kitchen and dining hall, school, and printing office within canvas shelters. Each family brought their own household possessions to Advance, furnishing tents with comforts, conveniences, and cultural symbols that mixed Victorian domesticity with radical social goals. While archaeological remains of Kaweah Colony households' daily lives are scant, their road and its associated camp locations provide tangible reminders in local memory of a time when hopeful social innovators considered this remote valley to be the "Center of Civilization."

Instant, Insistent History

All photographs are historical photographs. Whether they existed for seconds or millennia before the shutter clicks, the objects in the frame all have a history. Without knowing that history, photographs can become dead objects, untethered in time and space. The author uses contemporary photographs of Tulare County and archival and contemporary photographs of F Ranch in Point Reyes to show how the history of a landscape is revealed.

Initiation of Sexual Intercourse and Safe Sex Practices

Purpose and Background: This study aimed to (1) identify predictors of initiation of sexual intercourse before program implementation, and (2) assess the one-year impact of Reducing the Risk (RTR) on the delay of sexual intercourse initiation and safe sex practices among a predominantly Latino sample of 9th graders in Tulare County. RTR is an evidence-based program designed to delay initiation of adolescent sexual intercourse, and increase safe practices among those who are already sexually active. The program was implemented in Tulare County; whose average teen birth rate for 2009-2011 was 60.2 per 1,000 teens aged 15-19. Methods: Baseline and one-year follow-up data were collected on 390 students, beginning in their 9th grade year (53% female, 72.2% Latino/Hispanic). Students participated in a school-based pregnancy prevention program (RTR) and answered questions on HIV/STIs knowledge, attitudes about abstinence and teen pregnancy, parent communication, sexual intercourse, and safe sex practices. Results: Over one in eight students were sexually active at baseline. Overall, students reported long-term increases in HIV/STI knowledge and parent communication, decreases in intentions to have sexual intercourse and positive attitudes about teen pregnancy. Controlling for baseline differences, sexually active students reported fewer positive attitudes about abstinence. Conclusion: RTR may be more effective in preventing pregnancy and HIV/STIs among students who are not yet sexually active. Further, RTR does appear to successfully impact students who have already initiated sexual intercourse decisions to practice safe sex; however, not to become abstinent.