Valmiki Ramayana Ayodhya Kanda Sarga 80 Shloka 11

अचिरेणकालेनैव in a short time, बहूदकान् having large volumes of water, बहुविधाकारान् of different shapes, सागरप्रतिमान् like the sea, बहून् many, परिवाहान् water courses, चक्रुः constructed.

In a short time they constructed many water reservoirs of different shapes capable of holding large volumes of water like the sea.