The commercial development of the area in Sugihwaras Village, Sidoarjo has caused a large discharge runoff that can cause inundation in the area due to land conversion that reduces open land for water absorption. So it needs an increase in drainage capacity by knowing the flood plan discharge for a 5 year return period. Rainfall data taken for observations are rain stations Sidoarjo, Putat, Cepiples and Kludan. The method used to find a 5-year return period is the Log Pearson Type III because it is in accordance with the distribution test with a 5-year return period of 81,171 m³ / sec. With an extensive commercial development area of ± 40,191 m² the planned flood discharge obtained by a practical rational method is 0.630 m³ / sec and can be accommodated with planned drainage and bozem channels with a capacity of 1666.95 m³.