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Pacha Kulam(PachaiKulam)

Pacha Kulam(PachaiKulam)

PachaiKulam has been chosen for restoration by CMWSSB as part of the Sustainable Water Mission. This pond is located on the East of Surapet Main Road. The Division office is located nearby the pond. The pond is roughly rectangular in shape. The pond was filled with waste water from domestic areas nearby and emanated a foul smell. It was also used for washing purpose in the past. The pond was severely destroyed with solid waste dumping, liquid waste diversion, encroachment etc. The bund of the pond could not be traced as it was covered by dense bushes. The water spread was fully infested with weeds. Encroachment was rampant in the southern side of the pond. The waste water from the pond, over flows and water logs the adjacent roads and surrounding areas. The groundwater in this area is salty and hence the people depend totally on public water supply. As the public supply is limited and does not meet their daily demand, the people opined that renovation of the pond will at least meet their washing needs. Now the pond is fully restored under the Chennai Smart City project funds.

Area, Zone, Division

AREA: 5665.604 Sq.mtrs    ZONE: 3    DIVISION: 24

Area, Zone, Division

AREA:5665.604 Sq.mtrs   ZONE: 3    DIVISION:24

Location

 

This pond is in Division 24 of Zone  3 and is located on the Surapet Main Road. It is located to the East of the road. The Division office is located nearby the pond. The pond is located at North Latitude 13 8'36.91" and East Longitude 8011'26.08".

 

 

Field Observation and Inferences

 

The pond is roughly rectangular in shape. There pond is filled with waste domestic waste water and emanates a foul smell. It was sued for washing purpose by the community in the past. The pond is under severe destruction including solid waste dumping, liquid waste diversion, encroachment etc., The bund of the pond could not be traced as it covered with dense bushes. The water spread is fully infested with weeds. Encroachment is rampant in the southern side of the pond. The waste water from the pond, over flows and water logs the road and surrounding areas.

 

 

 

The groundwater in this area is brackish in nature and hence the community depend totally on public water supply. As the public supply is limited and does not meet their daily demand, the community opined that renovation of the pond will atleast meet their washing needs. As the pond is fully covered with dense bushes, Total Station Survey could not be done in this pons; Hence the area and bund length was estimated from Google Earth only. The total area of the pond is 1081.9 sq.m and the total length of the bund is 132m. The average depth of the pond is estimated to be 2m.

Impact of Urbanisation

 

The imagery extracted from google earth on 21.03.2016 and 31.08.2001 is presented below shows substantial reduction the water spread area.

 

Google Image of the pond as on 21.03.2016 (LEFT) and 31.08.2001 (RIGHT)

Pond Storage Estimation

 

The actual volume stored in the tank during 1987 a normal rainfall year - after losses due to evaporation and recharge is given in the following graph.

The total storage of the tank in its present condition is estimated at 2183.8 cu.m Based on this estimate, there will be water available in the pond for almost 90 days in a year. At no point of time, the pond overflows in a normal rainfall year. The net inflow to the tank in a normal rainfall year is estimated at 1345.80 cu.m; the total groundwater recharge will be 1985.49 cu.m. The net inflow estimated for an excess rainfall year is presented below :

 

 

 

The estimate was made in an excess rainfall year to see the inflow and outflow status. The actual volume stored in the tank after losses due to evaporation and recharge is given in the following graph. Based on this estimate, there will be water available in the pond for 102 days. The pond in its present volume does not over flows even in an excess rainfall period for the assumed catchment. The net inflow to the tank in an excess normal rainfall year is estimated at 9,327.8 cu.m; the total groundwater recharge is 3,317 cu.m.

Proposed Interventions

 

Based on the field observations and inferences, followed by the data analysis, following were the list of activities proposed for renovating the Pond.

  • To start with, the sullage diversion into the pond should be stopped. The outfalls from the individual houses should be stopped by providing soak pits at the house hold level.
  • The existing water should be dewatered and disposed.
  • The pond should be desilted and water hyacinth removed.
  • The bushes all around the bund should be removed and the bund strengthened; The pond need to be fully fenced and well protected with a gate with lock and key arrangement. 
  • Dumping of solid waste should be stopped.
  • The roof top pipes from the surrounding houses can be diverted into the pond.

After  completing the above tasks it is better to retain the water body as such for 1 or 2years after which the water body can be converted into a surface run off water harvesting and recharge system. Introducing recharge system at this stage would lead to the pollution of groundwater and hence it is not recommended.