rainwater harvesting in brigade millennium
DESCRIPTION
Presented by Mr. Shankar Rao (Refurb India), on 25-Feb-2012, in "The Water Workshop for Apartment Communities".TRANSCRIPT
Rain Water Harvesting System at Rain Water Harvesting System at Brigade MilleniumBrigade Millenium
(Cassia Block)(Cassia Block)
- Shankar Rao. Refurb India.- Shankar Rao. Refurb India.([email protected])([email protected])
As presented in “The Water Workshop for Apartment Communities” Organized by ApartmentADDA.com
• One of the earliest high rise apartment blocks in South Bangalore.
• The 5 blocks named after flowers:
Cassia
Mayflower
Magnolia
Laburnum
Jacaranda
• All 16 storey-tall with roof catchment of 2200 sq.m except for Laburnum.
• Today’s presentation is about :
CASSIA BLOCK
Rainwater Disposal – Rainwater Disposal – Pre RWHPre RWH
• Roof top water from 15th/16th floor.
• Down pipes 27 nos. led down chutes in the building center to Basement.
• Down pipes connected to 7 exit pipes.
• Rainwater flows out to Municipal drain/STP/open wells.
FLOW CHART – STORE & USE
FLOW CHART – STORE & USEFLOW CHART – STORE & USE
The ChallengeThe Challenge• Topography of Cassia not conducive for
direct flow to ground sumps.
• Necessitates pumping from Basement level.
• Transit storage became mandatory.
• Rains – unpredictable in timing, duration and intensity.
• Manual monitoring/Control/Action undependable.
The Solution - The Solution - Fully automatized systemFully automatized system
PHASE I:
Programmable logic control to start/stop pumping depending upon flow/storage status.
The Solution - The Solution - Fully automatized systemFully automatized system
PHASE II:
Action to meet the following ‘what if’ emergencies:• Filter block leading to Column Water Build-up.• Basement tanks full & ground sumps full and
rain continues.
The Solution - The Solution - Fully automatized systemFully automatized system
REMEDIES:
• Bypass valves made to change flow status.• Manual intervention for the above ruled out.• Self-operated mechanism activated – How?
The Solution - The Solution - Fully automatized systemFully automatized system
INNOVATIVE HYDRAULIC ACTIVATION SYSTEM:
• No electric power is required, hence no dependence on power supply.
• Water pressure available from roof top tank invoked.
The Solution - The Solution - Fully automatized systemFully automatized system
MECHANISM EMPLOYED:
A) Incase of tank overflow,
a float valve moves up &
opens water flow from roof top.
This action hydraulically moves
the bypass valves appropriately.
The Solution - The Solution - Fully automatized systemFully automatized system
B) Incase of a Filter block,
hydrostatic pressure builds up,
activating a spring-loaded lever,
thus opening the inlet valve;
Pressure activates hydraulically
to move bypass valves to
appropriate position.
Rainwater UtilizationRainwater Utilization
• BWSSB stipulates 70-75% water utilization from roof top catchment.
• Open paved catchment – no stipulation.
CATCHMENT AND RAIN YIELD AT CASSIACATCHMENT AND RAIN YIELD AT CASSIA
TypeTotal area in
sq.mStorage &
use RechargeTotal
harvested % Used
A B C B+C
Roof top 2200 1870 210 2080 95
Paved open 2800 0 1440 1440 51
Unpaved 687 0 500 500 73
TOTAL 5687 1870 2150 4020 72
Rainwater UtilizationRainwater Utilization
