SUNDER NAGAR RESIDENTS GROUP INTERACTIVE GROUP ALL RESIDENTS CAN POST ISSUES › Forums › NEWS › General Information on Water Harvesting
July 6, 2019 at 9:54 am #184
Contrary to what people believe , in a city like Delhi water harvested can rarely be used by the resident in a tank. Usage is primarily for places where the rainfall is consistent over a period of time. Yes, for the couple of months that we get rainfall a small tank can be attached to the main pipe and can be used for washing cars, driveways or watering plants. By and large this excersize is to raise the water table so our tube wells remain functional forever
Pit 1 –
The main rainwater drain pipe from the terrace has to be brought down into a pit in soft soil. The size of the pit would depend on the size of the plot, so about a 1000 square yard plot would need a pit approximately 8’X10’X8’ . This pit is fed by all the pipes from the terraces and has a baffle to control the water to the next pit so that muddy water is not transferred. It also has three layers , stones, pebbles and gravel topped with sand to desilt the water
Is a smaller chamber close to pit one and lower in depth. This gets the slightly less muddy water in it. In it is placed a perforated pipe which goes deep into the earth just above the existing water table level. The water from this pipe penetrates through the perforations into the adjoining soil to bring the table slowly up
Is a little more attention consuming. It is better to observe one monsoon before deciding the pit locations. Ofcourse the parks are ultimately the place but the location is important as the flow of water has to be monitored. The soil will absorb the water but only up to a point. The water has to reach deep to merge with the water table to help it to rise. A large park may need up to four pits depending on the slopes and where water collects. If harvesting is not done in the parks the soil gets saturated and the water lies on top of it either evaporating or going into drains.
The residents of the colony should see where there is water logging on the roads after a heavy downpour. That water logged area is the ideal place to tap into and direct the water flow to the nearest park , through pipes, where the pit is.
So it is advisable for colonies to observe water logging and slopes for this monsoon and then start the procedure after the rains are over.
However, all residents must get their homes done immedietly.
Please be advised that a lot of contractors are hand in glove with jal board. They merely do a cosmetic job of digging a pit without actually ensuring a deep pipe into the ground. Then the money is taken, a certificate taken from jal board after inspection and your penalty waived. You would have spent the money but the not gained any benefit for the future.
You must be logged in to reply to this topic.