FEATURE 31 system , where the water harvested is to be integrated with an existing reticulated system to ensure the perennial supply for nonpotable and potable uses , must be regulated .
Institutional arrangements Institutions are commonly defined as the ‘ rules of the game ’, including norms , beliefs , values , habits , and behaviour . They include both formal and informal arrangements , ranging from local to global level , and may give rise to compliance or resistance . The lack of a national umbrella body to coordinate RWH continues to hamper its expansion and makes the collaboration between the various players very difficult .
The DWS supports a national rainwater harvesting programme , which focuses on the construction of above and below-ground rainwater storage tanks by rural households for food gardens and other productive water uses . Clinics , schools , and hospitals have now been included as beneficiaries to some extent .
Of late , the provision of rainwater harvesting tanks is also driven through the Accelerated Community Infrastructure Programme . Several municipalities now use roof rainwater tanks for domestic purposes . These have been found to be particularly effective when used in conjunction with other water supply options .
DWS considers RWH as one of the practical water sources for schools . The potential of RWH to supply rural schools was further investigated by using the yield reliability analysis ( YRA ) model . The YRA model is a daily continuous simulation model based on the volumetric reliability approach that applies a daily continuous simulation modelling to obtain relationships between storage size , deficit , and its exceedance probability .
Pre-filtration This improves the quality of the harvested water and protects the pump . Keep in mind that the more pre-filtration options installed , the cleaner the water will be that enters your tank . The options include a rain head , which directs leaves and debris away from the flow of harvested rainwater , as well as a first-flush rainwater diverter which flushes away the initial , mostly contaminated flow of rainwater and directs clean water to your tank .
Other ways of using rainwater : Sustainability in Sports : New Seattle Arena uses rainwater for ice hockey Hockey players will skate on rainwater drained from the roof , filtered , and then frozen to create the playing surface at Seattle ’ s new Climate Pledge Arena . Aiming to be the first net zero carbon arena in the US , the arena is the first all-electric arena in North America after scrapping plans to install natural gas for heating water , cooking and dehumidification of the rink , according to officials .
Extracted from HPB Newsletter @ ashrae . com 06 / 12 / 2021 for the full story . PA
“ The functions of government are not only exercised at the national level but are also decentralised to levels closer to the people .”
Most departments appoint contractors for the supply and installation of rainwater harvesting tanks . Although it might be argued that it boosts the local economy by promoting entrepreneurial enterprises , more coordination is required to avoid unnecessary duplication and tease out dos and don ’ ts . The mainstreaming of RWH in the country ’ s water resources requires an institutional innovation that fosters the collaboration of several government departments .”
Extracted from JOJO document on rainwater harvesting . A water storage tank Start by establishing how much water the customer needs and for what they want to use it . The most common mistake in unsuccessful rainwater harvesting systems is a lack of storage capacity ( one invariably needs more storage than one thinks ).
A quick calculation to use : 1mm of rain on 1m 2 of roof surface = 1 litre of water . For example : a roof area of 100m 2 = 2 500 litres of water after 25mm of rain . Alternatively , calculate as follows : a 750-2,400l tank can cover a roof of 50-100 m 2 . Or a 2 700-10 000l tank can cover a roof 100-300m 2 .
February 2022 Volume 27 I Number 12 www . plumbingafrica . co . za