Karachi ke social worker Aman Khan Kakakhel ne North Nazimabad drain mein hydrophyte plants laga kar stormwater ko naturally filter karke useable banane ka tareeqa introduce kiya. Kehte hain yeh method Malir aur Lyari rivers par bhi apply ho sakta hai. Hydrophyte plants environment-friendly hain aur shehri garmi kam karne mein madadgar hote hain.