Rainwater harvesting system thesis
Fig 1: RWH: Indirect pump system. The study investigates the rainwater collected on a six-storied residential building with 25 persons residing in the building.
Calculations relating to the performance of rainwater catchment systems involve the use of runoff coefficient to account for losses due to spillage, leakage, infiltration, catchment surface wetting and evaporation, which will all contribute to reducing the amount of runoff.
According to Krishna , the most important benefit of rainwater harvesting is that the water is free; the only cost is for collection and use. Preservation of harvested rain water is thus one of the prime challenges in rainwater harvesting.
A number of parameters were included in the analysis: pH, fecal coliform, total coliform, total dissolved solids, turbidity, NH3—N, lead, BOD5, and so forth. Abstract Water is considered an everlasting free source that can be acquired naturally.
Community rainwater harvesting system
Haq  stresses that there are plans to set up a rainwater collection system in government buildings, semi- government buildings and buildings of autonomous bodies. It is, therefore, highly recommended that use of rainwater be integrated as a secondary resource in the integrated water management plan. Dymond, and D. Water usage patterns are different in different types of buildings. Problem Formulation A recent study shows that there is acute crisis in the quantity and quality of water in Dhaka, the capital of Bangladesh. In the developed world, the most commonly used storage device is the underground tank . Rainwater, in this study, is considered as water collected from roof surfaces during rain events. For additional capacity, an open-sided barn called a rain barn or pole barn which provides additional roof catchment can be built. Surplus water from rainwater harvesting is The run off coefficient for a concrete roof is assumed to be 0.
Therefore, alternative water supply options are becoming significantly important due to water scarcity and contamination risks. There is evidence in the Mediterranean region of a sophisticated rainwater collection and storage system at the Palace of Knossos, which is believed to have been in use as early as BC .
Rainwater harvesting survey report
Haq  says that the problems of quality of both the surface and groundwater have also added a new dimension to the water supply scenario. However, maintaining elevation gap between catchment roof, storage tank and flushing device is critical for operating flushes efficiently. Rainwater was used for agriculture and domestic purpose about BC in Israel . Globally, rainwater-harvesting system is used for domestic, agriculture, runoff control, air condition etc. Therefore, there is always a shortcoming of supplied water due to an imbalance between demand and supply. However, as heavy rainfall occurs in the rainy season from April to October , water has to be stored during rainy seasons for the rest of the year. Local people can be easily trained to implement such technologies, and construction materials are also readily available.
This is the typical size is of a large residential building in Dhaka. Introduction Dhaka is a densely populated city with an area of km2 [ 1 ] which is already labelled as a mega city [ 2 — 4 ].
If more buildings could be brought into such a programme it will not only greatly reduce demands on the conventional water sources, but also significantly reduce run-off, thus reducing flooding problems.
based on 54 review