serangoon reservoir forest water catchment

housing flat landscape barrier asia active shore serangoon nature woods wild water shrubs woodland treatment clean edge jungle beautiful rainforet garden freshwater area hdb buildings plants lowland bank filter grass security board regrowth apartment private forest abc margin recreation mixed catchment green singapore park regenerating ground sengkang rain land channel punggol natural sungai greenery waterfront spontaneous vegetation secondary utilities suburbs hougang space sungei modified barricade development condo suburban reservoir fringe storage rewild vegetated disturbed neighbourhood capture public residential landuse pub