Introduction – Burr hole craniostomy and closed system drainage are widely used in evacuating a chronic subdural hematoma (CSDH). The present study was done to assess the rate of reoperation in patients with chronic subdural hematoma after burrhole evacuation without a subdural drain. Material & methods- The present study was done among 100 patients, went for surgical procedure at a tertiary care hospital. Patients were graded with Markwalder's neurological grading system. Level of significance was kept at p <0.05. Results – All the operations were uneventful. All the patients were discharged alert and oriented. No incidence of recurrence within 12 months after surgery. Conclusion- This study demonstrated that surgical management of unilateral diffuse CSDH in adult patients by burr holes, irrigation are effective and associated with no recurrence.