The present invention relates to integration of multipurpose box tunnels with empty lakes and mini dam for effective flood control which prevents water from flooding the river (R), and hence protects, the inhabited locations, near the banks of the river, from floods. It relates to areas like city and villages, having major dam (D1) upstream and sea (S) downstream. Mini dam (D2), prevents the intrusion of sea water into the river, even at highest tide, and ensures the discharge of flood water, directly into the sea through multipurpose box tunnels (T), even during high discharge of flood water from major dam (D1) upstream and high tide simultaneously. The empty lake (EEL) and multipurpose box tunnels (Te) constructed as embankments, store water for emergency and utility purposes. Small box tunnels (D) discharge, drainage directly into the sea. Multipurpose box tunnels are surfaced with roads (Rd), increasing connectivity.
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