TM/HM 3122 Greening Hospitality and Tourism Lesson 4 - Rainwater Harvesting PDF

TM/HM 3122 Greening Hospitality and Tourism Lesson 4 – Rainwater Harvesting By Chandimal Ranathunga Where is Earth’s Water? Water Freshwater is in fact scarce, and becoming scarcer. Over 2 billion people already live in areas subject to water stress...

TM/HM 3122 Greening Hospitality and Tourism Lesson 4 – Rainwater Harvesting By Chandimal Ranathunga Where is Earth’s Water? Water Freshwater is in fact scarce, and becoming scarcer. Over 2 billion people already live in areas subject to water stress. Some 3.4 billion people, 45% of the global population , lack access to safety managed sanitation facilities. According to independent assessments, the world will face a global water deficit of 40% by 2030. The situation will be worsened by global challenges such as covid -19 and climate change. Rainwater Harvesting Rainwater harvesting is the process of collecting rainwater from potential catchments to supply of high water demand. Benefits of Rainwater Harvesting Water supply (Domestic, Industrial, Commercial) Water saving Flooding control Drought mitigation Disaster prevention (fire fighting) Groundwater recharge Energy saving (on treatment and pumping) Rainfall is one of essential factor of rainwater harvesting Rainwater Harvesting in Tourism & Hospitality Industry Availability of Catchments High freshwater use Landscaping Department/ Activity Percentage of Total Water Use Fire hydrant Guestrooms 30-35% Kitchen/ dishwashing 13-22% Use of Harvested Public Restrooms 5-20% Rainwater Laundry 5-17% Groundwater HVAC 3-16% Recharge Pools 2-5% Direct Use Landscaping 1-4% Source: Adapted from ITP, 2014 Groundwater Recharge If there is a constraint for the space you can think of groundwater recharge. Also if the rainy season is very short, it is not viable to invest in storage systems. Water Neutrality Water Positive Direct Use of Harvested Rainwater Cooling tower makeup Cooling towers are most often the largest consumer of water. As a rule of thumb, cooling towers use about a gallon of water/month for every square foot of conditioned space during the summer. Landscape irrigation Washing machines We estimate 5-10 gallons per room per night Toilet flushing Fire hydrant Cleaning Storage Usage Recharge Components of a Rooftop Rainwater Harvesting System Catchment (Rooftop) Conveyance (Pipes) First Flush Separator Filtration Storage Usage Recharge Catchments Rainwater Harvesting Potential Roof run-off = Catchment area (m2) x Rainfall (m) x Run-off coefficient Run-off coefficient Percentage of runoff or water that will be available for storage or recharge. Smooth surfaces will provide greater percentage for use: unpaved surfaces will absorb more water and less water for use. Amount if water lost for evaporation, absorption by surface, leakages etc. 2000m2 500m2 2000m2 Calculate the Rainwater Harvesting Potential of ITC Ratnadipa. Demand Side 400 litres/guest night 152 rooms and suites This research was conducted at a five- star hotel in the East Jakarta area of Indonesia that has 191 rooms and offers facilities such as a restaurant, 24-hour room service, lounge bar, outdoor swimming pool, spa and massage, and fitness centre. Water is a precious resource and recycling is a responsibility we must uphold to ensure a sustainable future for our planet. ITC Mughal, Agra & ITC Sonar, Kolkata & ITC Rajputana, Jaipur have become the first three ITC hotels to be LEED Zero Water Certified. The certification verifies net zero goals and signals market leadership in the built environment. The hotels have been ensuring that their water requirements are offset by the use of sustainable practices such as recycling water and rainwater harvesting. Thank You