Procedures and Time Line DescriptionDate 1) Design and LayoutDefined Area, Water Level, Structure Level, Finalize design and Layout 3 rd. Week Sept 2) Components and CostingRain garden, Wet Land, vertical wall irrigated by solar pump, Censored for flood control and Irrigation. 4 th. Week Sept 3) InstallationExcavation works, Install Hardscape and Softscape works 1 st. week October 4) Record Technical DataNitrogen and Phosphorus discharge, Censor record, Educational Signage October onward 5) MarketingAll potential areasNovember onward

Design Concept Rain water collected from drains and storm water will be channeled into rain garden and filtrate through amended soil layer( 60% sand, 10% compost and 10% top soil), gravel layer and Sand layer. This filtrated water further drained to Nerotanks, where water will pumped out into wetland B and overflood water from Wetland B will be convey into wetland A by Vegetated Swale. Then water in wet land A pump to rain garden and cycle water. Total catchment area 1389 sq-m (excluding construction area of 366 sq-m). Rain garden 30 sq-m. Wetland A 47sq-m and Wetland B 36sq-m. Vertical green wall is 24 sq-m. Water from retention tank will be irrigated to vertical wall where one solar pump will be used for irrigation to vertical wall and pump water to wet land A. It may need another pump for wetland B to rain garden. Need to find out common overflow pipe system for all rain garden and wetland.

Description SpecificationsRequired amount Rain Garden30 sq-m Nero Tanks for 25 cu-m500x 500x 560mm ( 0.14 cu-m) 180 set for 25 cu meter Geotextile 100 sq-m Heavy duty water proof PVC lining Thickness: 0.55mm Color: Black, ( 1.8m x5m)1 roll 100% waterproofing Heavy Duty PVC Canvas. 30 sq-m Grandnite Boulder 1/3 ton Gravel 9 cu-m Amended Soil Compost- 48/ ton, 20 % Sand -$ 100 /cu-m, 60% Top soil - $ cu-m, 10% 21 cu-m Coarse sand 3 cu-m Rheophytes/ natives plants 30 sq-m Specification

Description SpecificationsRequired amount Vegetated Swale4 sq-m 150mm thick gravel 0.6 cu-m 400mm thick sand and hardwood sawdust 3.6 cu-m 400mm thick sandy loam 3.6 cu-m Vegetation

Description SpecificationsRequired amount Wet Land B 47 sq- m Sands ( 300 mm thick) 14.1 cu-m Heavy duty water proof PVC lining Thickness: 0.55mm Color: Black, ( 1.8m x5m)1 roll 100% waterproofing Heavy Duty PVC Canvas. 1/2 roll/ 45 sq-m Submerge plants 47 sq- m Emergence plants Wet Land A 36 sq-m Sands ( 300 mm thick) 11 cu-m Heavy duty water proof PVC lining 1/2 roll/ 45 sq-m Floating leaves plants Floating plants

Description SpecificationsRequired amount Vertical wall 24 sq- m Solar pump, Panel, battery, Valves, controls 1 set Drain Pipes & Over flow pipes Hi Green 24 sq- m Overhead Tank(WQ) 1000 Litres Valves Dosatron Data Logging Flow meter Flood/ shortage rainfall Evaporation