Site Survey Research Articles

Sustainable Urban Clean Water Governance in Indonesia: Problems, Institutions, and Future Solutions

This study aims to explain the urban community-based clean water provision in Bandung City, in terms of general problems, institutional and governance aspects. Community-based clean water governance should be developed so that communities are independent and ready to produce clean water. When clean water is available, the time and money spent on obtaining clean water can be used for other more productive purposes and can improve community welfare. The method used in this research is a qualitative approach with a descriptive approach. Data collection was done through literature review, in-depth interviews and several site surveys. The results of this study indicate the low performance of Regional Water Supply Company in managing clean water supply and the absence of local regulations related to urban community-based clean water governance. In addition, the implementation of clean water provision in Bandung City has not integrated community-based governance. The conclusion of this research is that urban clean water governance in Bandung City and other cities in Indonesia using a community-based system for the current condition is very relevant. Furthermore, it is important to draft a local regulation on urban community-based water governance that aims to protect water resources as well as to create a clean and healthy environment, and sustainable.

A Wide Survey To Assess Population Of Long-Tailed Macaque Macaca Fascicularis (Primates: Cercopithecidae) In Lowland Region Of South Sumatra

The Long-tailed Macaque Macaca fascicularis is an Endagered primate because species' population decline very rapidly due to high levels of hunting for trade. A survey to collect data on the M. fascicularis population was carried out in the lowland areas of South Sumatra Province on 7 September-16 October 2023. This survey was carried out in 17 sites in four main districts/cities, including Palembang, Musi Banyuasin, Banyuasin and Ogan Ilir. This survey was recorded 4,316 individuals of M. fascicularis. This number suggest that M. fascicularis has good population number and still commonly found at the survey sites. Based on the survey coverage of the survey area and the total number of ??the lowlands in South Sumatra, we estimate the population of M. fascicularis in the lowlands in this province to be around 300,000 individuals. Further surveys are needed to determine the exact number of M. fascicularis populations in South Sumatra Province.

Advancing archaeo-geophysics through integrated informational-probabilistic techniques and remote sensing

Recent studies demonstrate the effectiveness of integrated archaeo-geophysical tools in resolving various geological-environmental challenges. This involves combining geophysical methods in archaeological fieldwork or remote sensing methods for preliminary survey and analysis of archaeological sites, potentially enhanced by machine learning techniques to estimate object shapes and characteristics. This study highlights the potential of employing informational and probabilistic approaches as optimal tools for evaluating and integrating critical information for archaeological research. Our proposed procedure for assessing the reliability of tools or toolsets is based on improved methodologies utilizing conditional probability, which were suggested in previous authors' publications. We illustrate examples of combining remote sensing, known for its low cost, portability, and effectiveness in initial archaeological site identification, with machine learning methods to locate and discover new sites in archaeologically well-studied areas in Israel. Subsequently, we conduct an informational assessment of remote sensing data and propose steps to correlate this data with other geophysical information probabilistically.

Design and Implementation of Solar-Powered Submersible Water Pump for Irrigation System in Subak Munduk Babakan Sangeh, Bali

This paper presents a comprehensive study on the design, implementation, and performance evaluation of a Solar-Powered Submersible Water Pump (SPSWP) system tailored for agricultural irrigation in Subak Munduk Babakan, Sangeh, Bali. With a focus on sustainable agriculture and water resource management, the system addresses the challenges of water scarcity during the dry season in the absence of natural irrigation sources. The SPSWP system, consisting of solar panels with a pump controller, a submersible pump, and a water tank, harnesses solar energy to power the pump, eliminating the need for extensive infrastructure. The research encompasses site survey and mapping, analysis and design, installation, benefits beyond irrigation, and technical measurements. The implementation shows promising results in overcoming water scarcity issues. The system's advantages include minimal maintenance, cost savings, and enhanced reliability. Additionally, the SPSWP system serves as an educational site for renewable energy study and awareness. Performance metrics are measured and discussed, including solar irradiance, voltage, current, solar panel temperature, and water discharge. The results indicate fluctuating solar energy availability, with voltage and current aligning with solar panel specifications. The system demonstrates a water discharge rate of 0.56 liters/second, showcasing promising outcomes in addressing water scarcity challenges for agricultural irrigation. Further research and monitoring are required to assess the long-term performance and sustainability of the system.

In-depth analysis of critical factors affecting Iraqi construction projects performance

Abstract Construction projects in Iraq suffer from many complex problems. Therefore, the aim of this study is to identify the most critical factors affecting the performance of Iraqi construction projects, delving into their identification, analysis, and understanding. A comprehensive list of 32 influential factors was compiled through site surveys, interviews with engineers and experts, and a review of previous research. These factors were categorized into eight groups: planning and management, design and engineering, procurement and supply chain, workforce and labor, technology and innovation, environmental and regulatory aspects, site conditions and infrastructure, and external factors. One hundred and ten questionnaires were distributed to project stakeholders, including owners, consultants, and contractors. The results found that the five most important factors affecting performance ranked using the relative importance Index are poor planning, failure to allocate resources properly, unavailability of skilled labor, poor labor productivity, and volatile economic conditions. Based on these results, for solutions to be effective, they must be adapted to the local environment. Project participants must be interested in planning as it is essential to address the same. The skills of project workers must be developed through training programs. Communication with project stakeholders must be coordinated to contribute to the decision-making process.

Spatial and temporal variation in ambient vibratory noise and its impact potential on a common urban arthropod

AbstractRecent, rapid arthropod declines have been tied to human activity. Yet, the propensity for human‐produced noise to disturb the substrate‐borne (vibratory) channel remains virtually untested despite arthropods' ubiquitous use of vibratory information. Characterizing the vibratory landscape at biologically relevant scales is an essential initial step. We aimed to measure vibratory noise across space and time to assess its potential overlap with the urban–rural range and season of a funnel‐weaving spider, Agelenopsis pennsylvanica (C.L. Koch) (Araneae: Agelenidae), a common urban arthropod. We assessed 24‐h ambient vibrations (hereafter vibratory “noise”) at 23 sites across urban–rural Lincoln, Nebraska (NE, USA), during the adult season of A. pennsylvanica (August–October). Vibratory noise (amplitude, Leq) varied by ~15 dB across sites overlapping with frequencies within A. pennsylvanica's sensitivity (20–1000 Hz). Urban vibratory noise was positively correlated with the principal component containing estimates of traffic‐induced vibrations (e.g., traffic volume, road proximity, and impervious cover), whereas rural noise levels correlated with probable harvest times. Our findings indicate spatial variation in noise in urban areas and seasonal noise variability in rural areas. We also tested how A. pennsylvanica—collected from four distinct noise survey sites—use their vibratory microhabitat. We assessed daily spider position and dry silk mass within a microcosm that played loud and quiet vibrations (white noise differing by ~15 dB) in separate but connected chambers. Age affected the chamber choice (hereafter “microhabitat use”) of spiders collected from the loudest site, as younger adults associated with and used more silk in the loud chamber, but this effect decreased with age. As our data demonstrate that vibratory noise varies with A. pennsylvanica's microhabitat and season with a high potential for impacting behavior, we hypothesize that this environmental noise likely impacts other arthropods as well.

Integration of socio-ecological data to prioritize biodiversity hot-spots for Marine Protected Area (MPA) delineation in the coastal zone of Bangladesh

Marine Protected Areas (MPAs) are widely used tools for conserving coastal and marine biodiversity and ecosystem health. However, the goal of declaring and managing at least 10 % of coastal and marine waters as MPAs has not been achieved in Bangladesh and many other countries. This study aimed at prioritizing the potential areas for MPA delineation in the south-west coastal zone of Bangladesh. The study also examined the socio-economic status, environmental and ecological characteristics of the study areas. Data on socio-economic, environmental, ecological, and management variables were collected through intensive field surveys from August 2023 to December 2023. The data were integrated using a multi-criteria analytical technique. Fishing was identified as the primary occupation for all fishermen surveyed, with secondary occupations including fish selling, marketing, and drying activities. The fishing areas for fishermen from the three survey sites were mainly concentrated in the offshore area. All three areas were identified as biodiversity hotspots, with Kuakata coast showing the highest species diversity, followed by Salimpur and Sandwip coasts. The study revealed that the Kuakata coast has the highest conservation importance, especially for IUCN red-listed species, juvenile fisheries species, and megafauna species. Salimpur coast is important for the conservation of saltmarshes, mangroves, and their dependent communities, while Sandwip is crucial for juvenile fish species conservation. Based on socio-ecological criteria, Kuakata was recommended as the most potential site for MPA delineation, followed by Salimpur and Sandwip. Implementing these recommendations can improve the management and execution of existing MPAs by focusing conservation efforts on areas with the highest biodiversity and ecological importance, ensuring better protection for vulnerable species, and enhancing the sustainability of local fishing communities. This, in turn, will ultimately enhance biodiversity conservation and ecosystem health in the southwest coastal area of Bangladesh.

Development and Utilization of Mini Herba Park (Family Medicinal Plant Education Park) as The Instructional Media of Students in RA Miftahul Ulum Arjasa, Jember, East Java

Mini Herba Park (Family Medicinal Plant Education Park) is a program to develop a Toga (Family Medicinal Plant) garden which is used as a learning medium for students at RA Miftahul Ulum. This community service aims to introduce and utilize Toga Park as a instructional media. Methods for implementing this program include conducting initial site surveys and interviews, making program plans, planning learning media and teacher modules, preparing the Mini Herba Park in the form of a place, tools and materials needed as well as other needs, carrying out learning and finally carrying out monitoring and evaluation. The results of this program include a Toga educational park in the school environtment, learning media in the form of accompanying books for teachers and students who have registered with HKI.

Preparation of design plans for drawings of the Kandawati Village Gate Building and Kandawati Tomb Hall

A gate is a structure in the form of an entrance or gate to an area or area. This structure is often found in temples and other Hindu religious shrines, because the gate is an important element in Hindu architecture. Gapura is also often interpreted as a gate. Pendopo is a building without walls with many pillars or pillars, this building is used as a place for meetings, pilgrimages, community meetings, and so on. Along with the progress of Kandawati village, especially the progress of Religious Tourism, it is necessary to build a gate as an icon of Kandawati Village. This gate building serves as an icon to attract tourists who will visit Kandawati Village. Therefore, the purpose of this service is to plan the design of the gate and pavilion of the Gandawati tomb in accordance with the cultural characteristics of Kandawati Village. The method of implementing the service includes site surveys, making working drawings of gates and pavilions, making budget plans, exposing the results of drawing designs and costs to the village. The result of this service is the compilation of technical drawings and budget plans that can be used by the village as the basis for the gate and pavilion construction plan. In this way, the village will be equipped with plans and cost plans when construction work is carried out.

Identification, Mapping and Solutions for Drought Management in Kaliori District, Rembang Regency, Indonesia

Rembang Regency is one of the regencies in Central Java that often experiences drought. Based on the results of the mapping of drought-prone areas for 2020 carried out by the Rembang Regency government, there are 63 villages spread across 14 sub-districts, 18,885 families are recorded as experiencing drought. Kaliori District is one of the sub-districts in Rembang Regency that is experiencing drought, this sub-district consists of 23 villages and is directly adjacent to the north of Java Sea. The purpose of this research is to be able to do a mapping for planning sustainable drought solutions, obtain quantitative data on drought and stages of drought management. The stages of the research carried out were site surveys and interviews related to drought in the Kaliori area. Prior to the Focus Group Discussion (FGD), a questionnaire was prepared. This research was conducted through joint FGD with all village heads in Kaliori District regarding water drought in Rembang. Based on the FGD and the statistical analysis results, it was found that 70% of Kaliori District experienced drought. When there is a drought, generally villages in Kaliori sub-district use water from water tanks and some use wells of poor quality and having a salty taste. The majority of villages in Kaliori Sub-district experienced a drought that lasted for 4-5 months of a year. Several parties involved in dealing with drought in Kaliori Sub-district included PAMSIMAS, Karang Taruna, Banser, Paguyuban, and P3A. Some solutions proposed are river connection, estuary river gate, and reservoir optimation.

Effects of the 2014-2016 marine heatwave on Steller sea lions in the Gulf of Alaska and implications for top-down forcing

Marine heatwaves can have rapid and wide-reaching biological and economic impacts. We explored the effects of a recent severe marine heatwave on Steller sea lions in the Gulf of Alaska and Southeast Alaska using biennial counts of pups and non-pups from aerial surveys of terrestrial sites between 2013 and 2019. We combined count data with a bioenergetic model to explore the potential effects of Steller sea lion responses to the heatwave on prey populations. Pup production was anomalously low in the eastern and central Gulf in 2017 following the end of the heatwave in 2016, with a 33.5 and 17.4% reduction from 2015 values respectively. Based on the energetic costs of pregnancy and lactation, these reductions in pup production represent an average difference of 6121 metric tons of prey between 2015 and 2017. Non-pup counts were anomalously low in Southeast Alaska in 2017 and in the central and eastern Gulf in 2019. No effects were detected in the western Gulf, although they could have been masked by the variability in count estimates. Such changes in non-pup abundance had the potential to induce changes in predation pressure on the order of thousands to tens of thousands of metric tons of prey, even when responses were assumed to persist for a relatively short time (1 yr or less). In addition to these short-term effects, declining counts of non-pups from the eastern Gulf and Southeast Alaska occurred following the 2014-2016 heatwave, suggesting more lasting effects on Steller sea lion populations and top-down forcing from these regions.

Exploring the Adaptation of Bulinus senegalensis and Bulinus umbilicatus to the Dry and Rainy Season in Ephemeral Pond in Niakhar (Senegal), an Area of Seasonal Transmission of Urogenital Schistosomiasis.

Bulinus snails surviving drought play a key role in the seasonal transmission of urogenital schistosomiasis, although our knowledge of their adaptation to dry season is still limited. We investigated the survival dynamic and infestation by the Schistosoma haematobium of Bulinus snails during the dry and rainy seasons in a single pond in an area of seasonal schistosomiasis transmission in Senegal. During the rainy season, 98 (94.23%) B. senegalensis and six (5.76%) B. umbilicatus were collected, respectively. In the dry season, B. umbilicatus outnumbered B. senegalensis, but all five (100%) B. senegalensis collected were viable and alive after the interruption of aestivation by immersion in water, while only 7 of 24 (29.16%) B. umbilicatus collected emerged from their dormant state. The rate of infestation with S. haeamatobium during the rainy season was 18.2% (19/104), while all the viable snails collected during the dry season were negative. B. senegalensis and B. umbilicatus have different seasonal dynamics with no evidence of maintaining S. haematobium infestation during the drought. Further studies including more survey sites and taking account both snails biology and ecological conditions are needed to better understand snail adaptation to seasonal changes and their ability to maintain S. haeamatobium infestation during drought.

Analysis of a planned neighbourhood of Kinshasa and its mix with spontaneous extension neighbourhoods: the case of the Maman Mobutu City

Kinshasa, one of Africa's most densely populated capital cities, has been grappling with the issue of informality in its planned settlements. This paper, aiming to understand this issue comprehensively, has employed a unique and rigorous qualitative and quantitative analysis. The research includes material and site surveys, allowing for a detailed study of the transformation of the Mamam Mobutu Garden City. Built-in the 80s on an existing informal village, the project later faced an invasion of illegal settlers and constructions. The surroundings have also witnessed the radicalisation of precarious communities, posing a threat to achieving sustainable human development.

Enhancing Communication Reliability: Designing Microwave Links for Bahir Dar-Woretta Connectivity

This paper explores the need for establishing a microwave link between Bahir Dar and Woretta as an alternative communication solution to the existing optical fiber infrastructure. Microwave links offer an effective way to overcome challenges posed by rugged terrains and unfavorable environmental conditions that hinder the deployment of fiber optics. As Woretta emerges as a key economic and investment hub within the Amhara Region, demand for reliable and efficient communication is expected to grow significantly. The study encompasses various aspects of planning and designing the microwave link, including site surveys, consideration of fade margins, frequency planning, link budget calculations, and assessing the feasibility and reliability of the proposed link. The paper employs LINKPlanner 5.4.1 software to simulate and validate the results. Due to terrain constraints, a direct link between Bahir Dar and Woretta is not feasible. Instead, a two-hop link is proposed, involving transmission from Bahir Dar to Zege, and then from Zege to Woretta. This alternative configuration ensures optimal connectivity while addressing the terrain limitations. By presenting a comprehensive analysis and simulation of the microwave link, this paper provides valuable insights into the planning and implementation of a robust communication infrastructure. The proposed microwave link will offer a reliable and efficient alternative to the existing optical fiber network, ensuring uninterrupted connectivity to support the region’s growth and development.

Penegakan Hukum Terhadap Pendirian Bangunan Dikawasan Daerah Aliran Sungai (Das) (Studi Di Kecamatan Dolopo Kabupaten Madiun Jawa Timur)

Abstract— The purpose of this study was to determine law enforcement against the construction of buildings in the Watershed area of Dolopo District, Madiun Regency and find out the settlement of the construction of buildings that violate the watershed area. The type of research used is empirical research with a qualitative approach based on primary data, namely observation, interviews and document studies. Secondary data are social facts referenced from books, research results and scientific journals. And analyzed using descriptive research methods, that researchers in analyzing wish to provide an overview or description or subject and research object as the results of the research he did. Based on the results of the research, it shows that law enforcement against the construction of buildings in the watershed area, it is better for the community to obtain permits (IMB) to construct buildings in the river basin and the government is expected to be more intensive in conducting outreach and site surveys in the watershed area to the fullest so that the community is aware and no longer constructing buildings in the watershed area.

Burning Frequency Influences Plant Composition and Diversity and Mycorrhizal Spore Density in a Lateritic Dry Deciduous Sal Dominated Forest

Abstract: Burning in forest floor, specially, in deciduous forests is an annual practice of forest dwellers in some states of India to collect non timber forest produce at ease. Sometimes this springtime burning get out of control and damage the forest severely. Sal dominated mixed forest in Godapyasal range, Midnapore division, West Midnapore in south West Bengal, with different fire incidence histories was taken for the study. An intensive survey of sites with regular burning, occasional burning and no burning were done to study plant diversity and community composition and the results were compared within different sites. Severe burning regimes damaged the plant density drastically rendering the saplings of subdominants only near ground level as coppice. Mild fire frequencies, though not severely damaged plant community, differed from unburned area significantly. Fire hardy tree species are dominant and subdominant in both sites. In severe burned site, plant diversity increased with a number of invasive perennials and annuals and spiny undershrubs and show even distribution. Common plants in the three communities were observed to be affected in their community parameters with burning frequency. Frequent and occasional burning both reduced mycorrhizal population with larger spores drastically and not replaced even after nine months of burning. AMF with smaller spores are less affected.

Integrating portable X-ray fluorescence site survey and ArcGIS models for rapid risk assessment and mitigation strategies at an abandoned arsenic mine site: a case study

ABSTRACT Australia’s metalliferous abandoned mine sites (MAMSs), pose tangible threats to the environment and human health. To address these concerns, our study utilised state-of-the-art handheld XRF technology to conduct a real-time assessment of the Mole River arsenic mine site. The data revealed notably elevated levels of arsenic and manganese, with the southeast corner of the site identified as a contaminant hotspot. We used a tiered risk assessment approach to compare the detected contaminant concentrations to the Australian health investigation levels (tier 1). This led us to a broader examination of erosion vulnerabilities and the potential migration of contaminants (tier 2). Further, a hydrological assessment (tier 3) identified significant erosion in southern regions, indicating the potential for contaminants to be transported off-site through surface water runoff to Sam’s Creek and Mole River. The proximity of a reservoir to these runoff pathways brought forth additional challenges, especially during heavy rainfall events. Subsequent laboratory analysis of water samples reinforced our findings, as they confirmed heightened arsenic concentrations in Mole River downstream, accentuating the potential risks to ecosystems and human health. By integrating the XRF contour map and erosion assessment with the RUSLE model, valuable insights are gained into critical hotspots with high contamination and erosion potential. By directing rehabilitation efforts towards critical hotspots, resources can be allocated more efficiently and cost-effectively.

ERNet: A Rapid Road Crack Detection Method Using Low-Altitude UAV Remote Sensing Images

The rapid and accurate detection of road cracks is of great significance for road health monitoring, but currently, this work is mainly completed through manual site surveys. Low-altitude UAV remote sensing can provide images with a centimeter-level or even subcentimeter-level ground resolution, which provides a new, efficient, and economical approach for rapid crack detection. Nevertheless, crack detection networks face challenges such as edge blurring and misidentification due to the heterogeneity of road cracks and the complexity of the background. To address these issues, we proposed a real-time edge reconstruction crack detection network (ERNet) that adopted multi-level information aggregation to reconstruct crack edges and improve the accuracy of segmentation between the target and the background. To capture global dependencies across spatial and channel levels, we proposed an efficient bilateral decomposed convolutional attention module (BDAM) that combined depth-separable convolution and dilated convolution to capture global dependencies across the spatial and channel levels. To enhance the accuracy of crack detection, we used a coordinate-based fusion module that integrated spatial, semantic, and edge reconstruction information. In addition, we proposed an automatic measurement of crack information for extracting the crack trunk and its corresponding length and width. The experimental results demonstrated that our network achieved the best balance between accuracy and inference speed compared to six established models.

On-farm crop diversity, conservation, importance and value: a case study of landraces from Western Ghats of Karnataka, India

Landraces are important genetic resources that have a significant role in maintaining the long-term sustainability of traditional agro-ecosystems, food, nutrition, and livelihood security. In an effort to document landraces in the on-farm conservation context, Central Western Ghat region in India was surveyed. A total of 671 landraces belonging to 60 crops were recorded from 24 sites. The custodian farmers were found to conserve a variety of crops including vegetables, cereals and pulses, perennial fruits, spices, tuber and plantation crops. The survey indicated a difference in the prevalence of landraces across the sites. A significant difference with respect to the Shannon-diversity index, Gini-Simpson index, evenness, species richness, and abundance was observed among the different survey sites. Computation of a prevalence index indicated the need for immediate intervention in the form of collecting and ex situ conservation of landraces of some crops as a back-up to on-farm conservation. The study also identified the critical determinants of on-farm conservation, including (i) suitability to regional conditions, (ii) relevance in regional cuisine and local medicinal practices, (iii) cultural and traditional significance, and (iv) economic advantage. The information documented in this study is expected to promote the collection and conservation of landraces ex situ. The National Genebank housed at ICAR-NBPGR, New Delhi conserves around 550 accessions of landraces collected from the Central Western Ghats region surveyed in this report. Information collected from custodian farmers on specific uses will be helpful to enhance the utilization of these accessions.

Familial aggregation of human hookworm infections in Sichuan Province

To investigate the family aggregation of human hookworm infections in Sichuan Province and to identify its influencing factors, so as to provide insights into management of hookworm infections. Three to four counties (districts) were sampled from basins, hilly regions and mountainous regions around the basins in Sichuan Province from 2017 to 2022 as fixed survey sites, and 17 to 30 counties (districts) were selected as mobile survey sites. At least 1 000 permanent residents at ages of 3 years and older were sampled from each survey site, and hookworm eggs were detected in human stool samples using the Kato-Katz technique. Subjects with 2 and more family members and at least 2 individuals diagnosed with hookworm infections in the county (district) where they lived were selected, and the familial aggregation of hookworm infections was analyzed using the test of goodness of fit for binomial distribution. In addition, the knowledge and practice of hookworm disease control were investigated among residents in Hejiang County and Wutongqiao District, Leshan City, Sichuan Province in 2021 and 2022, and the difference in the knowledge and practice of hookworm disease control was compared between members with and without familial aggregation of hookworm infections. A total of 66 812 residents from 25 196 households were sampled from main endemic areas of hookworm diseases in Sichuan Province from 2017 to 2022 for detection of hookworm infections, and 4 403 infections were identified (6.59% prevalence). The distribution of human hookworm infections in Sichuan Province did not fit the binomial distribution, and showed family aggregations (χ2 = 2 116.759, P < 0.001). Family aggregation of human hookworm infections was found in endemic areas with 1% and higher prevalence of human hookworm infections (χ2 = 136.006 to 428.738, all P values < 0.001), and family aggregation of human hookworm infections was identified in different years (χ2 = 87.615 to 471.838, all P values < 0.001) and in different terrains of endemic areas (χ2 = 8.423 to 1 144.176, all P values < 0.001). The members with hookworm infections had median eggs per gram of 180 (interquartile range, 780) in aggregated families and 72 (102) in non-aggregated families (Z = -2.686, P < 0.05). The proportion of members in families with aggregation of hookworm infections who knew the preventive measures of hookworm disease was significantly lower than in non-aggregated families (24.49% vs. 51.72%; χ2 = 10.262, P < 0.05), and the proportion of members in families with aggregation of hookworm infections who often worked barefoot on the ground was significantly higher than in non-aggregated families (30.61% vs. 13.25%; χ2 = 6.289, P < 0.05). There is a familial aggregation of human hookworm infections in Sichuan Province, and awareness of preventive measures for hookworm disease and frequent working barefoot on the ground are associated with familial aggregation of hookworm infections.