Perencanaan Rainwater Harvesting System Dengan Metode Roof Catchment (Studi Kasus: Gedung 8, Institut Teknologi Nasional, Bandung)

The Rainwater Harvesting System Development Planning which will be built using the Roof Catchment method in Building 8 Campus of the National Institute of Technology is an effort to implement policies for soil conservation, collecting rainwater so that it can be reused and participating in environmental protection and planning. The data needed in planning the Rainwater Harvesting System is data on water needs, rainfall, active student data and the existing condition of the building which will later be planned for the Rainwater Harvesting System. After doing the calculations, it was found that the water needs of students in building 8 is 1,168.8 m3/month, the tank volume is 11,159.39 m3 with a depth of 2 m and a tank width of 2.4 m, rainwater discharge is 134,564 m3/s, and dimensions gutter signs of 9 m with a length of 22 m as many as 4 (four) gutters. The construction of the Rainwater Harvesting System is expected to be an alternative in minimizing the use of uncontrolled groundwater and utilizing rainwater as a substitute when the dry season comes. Planning for the Rainwater Harvesting System in Building 8 of the National Institute of Technology requires a cost of Rp. 63,522,000.00 Keywords: Rainwater Harvesting System, Roof Catchment, GutterA B S T R A K Perencanaan Pembangunan Rainwater Harvesting System yang akan dibangun dengan metode Roof Catchment di Gedung 8 Kampus Institut Teknologi Nasional merupakan upaya dalam pelaksanaan kebijakan untuk konservasi tanah, menampung air hujan agar dapat digunakan kembali serta peran serta dalam perlindungan dan perencanaan lingkungan hidup. Data yang dibutuhkan dalam perencanaan Rainwater Harvesting System adalah data kebutuhan air, curah hujan, data mahasiswa aktif serta kondisi eksisting bangunan yang nantinya akan direncanakan Rainwater Harvesting System-nya. Setelah dilakukan perhitungan maka didapatkan bahwa kebutuhan air mahasiswa di gedung 8 sebesar 1.168,8 m3/bulan, volume tangki sebesar 11.159,39 m3 dengan kedalam 2 m dan lebar tangki 2,4 m, debit air hujan sebesar 134,564 m3/det, dan dimensi talang rambu sebesar 9 m dengan panjang 22 m sebanyak 4 (empat) talang. Pembangunan Rainwater Harvesting System diharapkan dapat menjadi salah satu alternatif dalam meminimalisir penggunaan air tanah yang tidak terkontrol dan memanfaatkan air hujan sebagai pengganti disaat musim kemarau datang. Perencanaan Rainwater Harvesting System di Gedung 8 Institut Teknologi Nasional memerlukan biaya sebesar Rp. 63.522.000,00 Kata Kunci: Rainwater Harvesting System, Roof Catchment, Talan

Rainwater Harvesting System

Water is a crucial resource for the survival of life on earth. Unfortunately, with the increasing threat of climate change fresh water is expected to become a pressing issue in the future for many countries, including the southeastern region of the United States (EPA 2013), refer to figure 1. According to the EPA, water management is likely to become a challenging issue, due to rising temperatures, and demand due to economic and population growth (EPA 2013). Increased temperatures are likely to lead to longer, more intense, and more frequent droughts in the Southeast, putting more stress on water resources (EPA 2013). There is also a concern that saltwater may mix with shallow aquifers of groundwater in coastal areas, due to expected rise in sea level, contaminating the groundwater (EPA 2013). One way to adapt to the changing climate and rain patterns, is to start harvesting rainwater

Empirical model simulating rainwater harvesting system in Tropical area

Rainwater harvesting is the technique of capturing the rainfall to meet some water needs in both urban and rural areas. The volume of rainwater collected from rainwater harvesting system varies from place to place and depends mainly on the climatic condition. Typically, the rainwater harvesting system is composed of the catchment (roof), gutter, rainwater pipe, and storage tank. Reliability of a rainwater harvesting system mainly depends on the collected volume in rainwater storage tank and it is also used to check whether the collected volume of rainwater can meet a specific water demand (either for potable or non-potable uses). In the present study, a rainwater harvesting system is installed at the Faculty of Engineering, University Putra Malaysia. The system is tested using data from 24 different rain events. The collected data includes rain depth and rainwater volume. It is found that the rainwater volume ranges form 0.027 m³ to 4.03 m³. The actual data is used to produce an empirical model for predicting the collected rainwater volume. Calibration and validation processes are conducted to the proposed model and T-test shows that the model prediction is within 95% level of confidence. Also, the water consumption for toilet flushing is monitored using water meter. Reliability of the installed rainwater harvesting system for toilet flushing is computed. It is found that the system reliability ranges from 26.61 % to 100 % depending on daily water demand and recorded rainwater depth

Rainwater Harvesting System: Proposal for a Pilot Rainwater Harvesting System Installment at Booker Hall

Fresh water is expected to become increasingly scarce as temperature and sea levels rise due to Global Climate Change. We believe now is the time to start rethinking our behaviors in terms of water use and start conserving water even if it is on a small scale. One of the best ways to conserve water at a university level is to install small scale rainwater harvesting system for irrigation. We propose for the University of Richmond to utilize Booker Hall to collect rainwater using ten 200 gallon rain barrels. The water will be used to irrigate flowerbeds around campus. The project will be relatively low cost, costing the University $2,859.50. Although today the project only saves the University a little under$200 per year, in the future the project will become more economically sustainable since water will become more expensive and possibly less subsidized. Paper prepared for the Environmental Studies Senior Seminar/Geography Capstone

Modelling of a roof runoff harvesting system: The use of rainwater for toilet flushing

The water balance of a four-people family rainwater harvesting system was calculated in a case study. The experimental water saving efficiency (WSE) was calculated as 87 %. A simple computer model was implemented to simulate the behaviour of the rainwater harvesting system. In general, the rainwater collector volumes predicted by the daily model had shown a good correlation with the experimental values. The difference between the experimental and the predicted values for the stored volume can be explained by the lack of maintenance of the system that can affect its performance. On the basis of a long-term simulation of 20-year rainfall data, the following parameters were calculated: rainfall, water demand, mains water, rainwater used, over-flow and WSE. The collection of rainwater from roofs, its storage and subsequent use for toilet flushing can save 42 m3 of potable water per year for the studied system. The model was also used to find the optimal size of the tank for the single-family household: a storage capacity of approximately 5 m3 was found to be appropriate. The storage capacity and tank size were distinguished. The importance to take into account the dead volume of the tank for the sizing was indeed highlighted

On-site assessment of environmental and sanitary qualities of Rainwater Harvesting System (RWH) in a rural community in Benin City, Nigeria

Around fifty percent of individuals living in underdeveloped countries lack safe drinking water and sanitation. Occasionally their water sources get contaminated with their waste leading to an elevated level of distress. The improvement of water supply, sanitation, hygiene and management of water resources can hugely prevent up to one-tenth of the global disease burden. On-site assessment of environmental and sanitary qualities of rainwater harvesting system (RWH) in households was carried out using a structured questionnaire. The structural assessment of the rainwater harvesting system showed that corrugated iron sheet was the roof type used in all sites surveyed. Also all the rainwater harvesting (RWH) system surveyed was found to have gutters, although the condition of the gutters varied: good (15%), fair (65%) and poor (20%). The harvested rainwater reservoir was mainly made of concrete (90%) with subsurface submerge in the ground. On-site assessment of the sanitary location of the RWH system showed that 5% were located near a septic tank and another 5% in flooded area. The harvested rainwater was used for several domestic purposes including drinking. All respondent agreed that they use rainwater for washing while 10% of the respondent agreed that they drink the harvested rainwater. The maintenance culture of RWH system owners was investigated. Sixty-five percent (65%) of respondent agreed that they have first diverters devise installed in the rainwater harvesting system. Ten percent (10%) of respondent has never cleaned their storage reservoir. Of the remaining respondents, 50% cleaned their reservoir once a year while 25% clean twice a year. The rainwater harvesting system in the study area lack basic environmental and structural requirements which pose potential health risk to individual who rely on the source of water for potable use.Keywords: Water shortage, Health risk, Water quality, Roof-top, Rainwate

Techno-economic and sensitivity analysis of rainwater harvesting system as alternative water source

© 2019 by the authors. This paper formulates a rainwater harvesting model, with system and economic measures to determine the feasibility of a rainwater harvesting system, which uses water from the mains to complement the system. Although local meteorological and market data were used to demonstrate the model, it can also be easily adapted for analysis of other localities. Analysis has shown that an optimum tank size exists, which minimizes the cost per unit volume of water. Economic performance measures have indicated that rainwater harvesting system is currently infeasible to be implemented in Brunei; with capital cost and water price being shown to be among the prohibiting factors. To improve feasibility, a combination of rebate scheme on capital cost and raising the current water price has been proposed. It has also been shown that the system is more viable for households with high water demand

RAINWATER HARVESTING SYSTEM (MYRAWAS): TOWARDS UPSCALING WATER-CONSERVING PRACTICE AT UNIVERSITY LEVEL

With rapid population growth and growing demand on the water supply, rainwater harvesting has been seen as a viable alternative for providing clean water supplies for domestic uses. In accordance with the urgency, the rainwater harvesting system (MyRAWAS) has been designed and installed to supply water for domestic uses at Kolej Ungku Omar residential college, Universiti Kebangsaan Malaysia. Although the quality of rainwater from a rainwater harvesting system can vary depending on environmental conditions, selection and installation of appropriate storage and catchment materials together with the application of post-cistern treatment can significantly improve harvested rainwater and reduce cistern cleaning. The development of rainwater harvesting system, also known as MyRAWAS is one of the important initiatives towards sustainable water management in UKM that is located within the Langat watershed, Selangor