 Ruinwater Ruinwater is the most common technique used in city areas Ruinwater is collected on the roof and transported with cutters to storage is a wall where it provides water at the point of consumption So let's see fully details that of its Ruinwater harvesting techniques Rainfall pattern over the year is important to determine whether rainwater harvest system compatible or not This system suitable for tropical climate with short dry seasons and wet tropical climate As a general rule, rainfall should be over 300 mm per year Fallow Ruinwater is suitable to implement this system as the average rainfall is 2,366.2 mm per year The first component of Ruinwater harvesting is the catchment area There exist various types of harvesting structure systems For example, the industrial buildings may install a system on top of the building and for residential houses, usually that depends on their roofs The slope of the roof affects how quickly water will run off Less steep roof has to slower run off hence brings in more contamination such as bird droppings, dirt and small twigs Whereas for steep roof, there is a faster run off having lesser contamination Delivery system consist of gutter and dawn pipe Their size are based on rainfall intensity and roof area Gutter usually just below the roof and catches water falls from the roof Could be made using galvanist iron or PVC material While dawn pipe transport water from gutter to storage tank PVC pipes are preferred Then, the first spell of Ruin is flush up using first flush device as it carries high pollutants from the air and roof surface The storage tank contengs a filtration system to filter out unwanted meters It is layered with gravel, charcoal and sand There are two types of storage reservoir which is small-scale storage and large-scale storage The small-scale storage is common in developing countries such as using plastic bowl, bucket and old oil drums For storing larger quantity of water, this system will usually require a tank above and below ground For domestic system, volume are typically up to a maximum of 20 or 30 cubic meters Service tank are common for roof collection that can be made of metal, wood, plastic or fiberglass The designations of sub-service tank must have walls that can resist the external water pressure when empty Infiltration tank is used to collect water from a storage tank which can be used for replenishing per well or aquifer During rainy season, the excess rain water is used to recharge drug well, as well as ground water In this case, the water quality will improve in the drug well As we know, everything technology do have pros and cons So, here's the advantages of this rain water harvesting where the cost for buying city water supply can be safe It provides water at the point of consumption and can reduce flooding and clogging of trains While for these advantages, it will be limited by the amount of rainfall and the size of the catchment area needs proper operation and regular maintenance and rain water quality may be affected by animal or bird droppings Third and organic method Several rain water harvesting system have been implemented by Malaysian government For example, National Zoo that located in Ampang, Selangor University Tunusian On Hostel in Batu Pahad Johor and lastly, Pukit Indermas in Ampang