International Science Community Association International Research Journal of Environmental Sciences 2319-1414 10 1 2021 01 22 Assessment of rainwater quality and potential for rainwater harvesting in Dallu Awas area, Kathmandu, Nepal 62 73 EN Tripti Kumari 1 Laboratory of Environment and Biotechnology, Department of Botany, Patna Science College, Patna University, Patna 800005, India . Shardendu 2 Laboratory of Environment and Biotechnology, Department of Botany, Patna Science College, Patna University, Patna 800005, India Aguilar Mark Gabriel Wagan 1 ABE International Business College-Quezon City, Philippines Acharya Bishwa B. 1 Department of Mechanical Engineering, IOE Pulchowk Campus, TU, Nepal Shrestha Yugal K. 2 Department of Mechanical Engineering, IOE Pulchowk Campus, TU, Nepal Dhakal Sandeep 3 Department of Mechanical Engineering, IOE Pulchowk Campus, TU, Nepal Joshi Usha 4 Department of Physics, Patan Multiple Campus, TU, Nepal Poudyal Khem N. 5 Department of Applied Sciences and Chemical Engineering, IOE Pulchowk Campus, TU, Nepal Topale Sanket 1 Department of Environmental Engineering, K.I.T.s College of Engineering (Autonomous), Kolhapur, India Ingavale Bharat 2 Department of Environmental Engineering, K.I.T.s College of Engineering (Autonomous), Kolhapur, India Radha K.V. 1 Bioproducts Laboratory, Department of Chemical Engineering, A.C.Tech., Anna University, Chennai 600025, India Gopalakrishnan V. 2 Bioproducts Laboratory, Department of Chemical Engineering, A.C.Tech., Anna University, Chennai 600025, India Vijayalakshmi B. 3 Bioproducts Laboratory, Department of Chemical Engineering, A.C.Tech., Anna University, Chennai 600025, India Kowenje Chrispin O. 1 Maseno University, P.O. Box 333 - 40105, Maseno, Kenya Onyango David M. 2 Maseno University, P.O. Box 333 - 40105, Maseno, Kenya Okwiri Luciana 3 Maseno University, P.O. Box 333 - 40105, Maseno, Kenya Shikuku Victor O. 4 Kaimosi Friends University College, P.O.Box 385-50309, Kaimosi, Kenya Sifuna Anthony 5 Maseno University, P.O. Box 333 - 40105, Maseno, Kenya and Masinde Muliro University of Science and Technology, P.O. Box 190-50100, Kakamega, Kenya Omondi Erick 6 Maseno University, P.O. Box 333 - 40105, Maseno, Kenya Barasa David 7 Maseno University, P.O. Box 333 - 40105, Maseno, Kenya Oduor Andrew 8 Maseno University, P.O. Box 333 - 40105, Maseno, Kenya Lungayia Henry B.O. 9 Masinde Muliro University of Science and Technology, P.O. Box 190-50100, Kakamega, Kenya Owigar Rosemary 10 Maseno University, P.O. Box 333 - 40105, Maseno, Kenya Otuya Petronila 11 St. Pauls University, P.O. Box Private Bag 00217, Limuru, Kenya Dhananjay Pande Shruti 1 Department of Environmental Science, Fergusson College (Autonomous), Pune, India Tejal Vedanti 2 Department of Environmental Science, Fergusson College (Autonomous), Pune, India Vilas Mane Ashish 3 Department of Environmental Science, Fergusson College (Autonomous), Pune, India Ashwini Supekar 4 Department of Geology, Savitribai Phule Pune University, Pune, India Clotilde Guidi Tognon 1 Laboratory of Processes and Technological Innovations, National Institute of Industrial Technology (INSTI) of Lokossa, Lokossa, Benin Constant Alihonou Agnimoan 2 Laboratory of Processes and Technological Innovations, National Institute of Industrial Technology (INSTI) of Lokossa, Lokossa, Benin Victorin Chegnimonhan K. 3 Laboratory of Processes and Technological Innovations, National Institute of Industrial Technology (INSTI) of Lokossa, Lokossa, Benin and PTAA, CRA Agonkanmey, National Institute for Agricultural Research of Benin, Cotonou, Benin Alain Adomou 4 Laboratory of Processes and Technological Innovations, National Institute of Industrial Technology (INSTI) of Lokossa, Lokossa, Benin Sabita Nepal 1 Department of Environmental Science, Padma Kanya Multiple Campus, Tribhuvan University, Kathmandu, Nepal Gopal Ghimire Narayan 2 Central Department of Geology, Tribhuvan University, Kirtipur, Kathmandu, Nepal Rajana Maharjan 3 Nepal Naya Aayam Multidisciplinary Instititute, University of Northampton, Jorpati, Kathmandu Nepal Sudarshana Shakya 4 Department of Botany, Bhaktapur Multiple Campus, Tribhuvan University, Bhaktapur, Nepal Devi Shakya Bindra 5 Department of Mathematics and Statistics, Padma Kanya Multiple Campus, Tribhuvan University, Kathmandu, Nepal Amrita Tamrakar 6 Department of Botany, Padma Kanya Multiple Campus, Tribhuvan University, Kathmandu, Nepal Raj Shakya Pawan 7 Department of Chemistry, Padma Kanya Multiple Campus, Tribhuvan University, Kathmandu, Nepal > Research Paper 2020 9 20 2021 01 22 Nepal is rich in natural resources and it is among the richest in terms of water resource availability. The average annual rainfall of the country is in between 1500-3000mm. However, water scarcity is a major problem in Kathmandu valley as well as in some major cities of the country. In this context, rainwater harvesting may serve as one of the promising ways of supplementary water supply system to meet water demand in the valley. This study is aimed to analyze the potential for rainwater harvesting, the rainfall pattern and rainwater quality at Dallu Awas area which lies within the central-western part of the Kathmandu valley. Potential rainwater harvesting was determined by the questionnaire survey method and using a mathematical formula. The rainfall pattern was determined by analyzing the rainfall data supplied by the Department of Hydrology and Metrology, Government of Nepal and, the quality of rainwater was determined by analyzing its physico-chemical and microbial parameters in the laboratory. The study showed 90.33m3 of rainwater harvesting capacity per household. Between 2006-2015 AD, the highest amount of rainfall (1829.4mm) was recorded in 2011 and the lowest (98.25mm) in 2009. For rainwater quality, a total of 81 rainwater samples were collected directly from atmospheric precipitation during rainy season from three different cluster zones viz., residential, school and hospital of the study area. The assessed physico-chemical, and microbial quality parameters were turbidity, electrical conductivity (EC), pH, biogenic compound, heavy metals (Fe, Mn, Pd and Zn) and total coliforms. Results revealed that the values of tested parameters were found within the guideline values set out by the NDWQS and WHO. Hence, the present study suggests that water scarcity in Kathmandu may be solved to some extent if proper rainwater harvesting system is adopted and collected rainwater may be used for multiple purposes following proper disinfection process. Copyright@ International Science Community Association