Drainage Policy for Development

Purpose
Section 343.20 of the City of Hamilton Subdivision Regulations, "Requirement for Storm Drainage System", stipulates that "every development shall be provided with a storm drainage system that provides adequate, complete and satisfactory drainage service for the entire area being platted for all projected land uses and otherwise meeting the approval of the officials having jurisdiction."

This section stipulates that the City Engineer must finally approve the drawings, plans and specifications for the drainage system. Natural streams and water courses should be left as undisturbed as practical. All natural streams and water courses shall be inspected by the City Engineer and the Developer’s Engineer prior to final plan approval. Any necessary stabilization and erosion protection deemed necessary by the City Engineer shall be included in the development plans.

Responsibilities
It is the responsibility of the developer's engineer to design this drainage system and it is the responsibility of the City Engineer to judge the adequacy of the design. The following has been written to clarify the standards that will be judged by the City Engineer as adequate. These should be considered minimum standards and certain conditions may require exceeding these standards.

Rainwater & Land Development
The Ohio Department of Natural Resources Rainwater and Land Development manual is a comprehensive source of general standards to use to avoid, minimize, or compensate for impacts to water resources. The manual is available for download (PDF) from the Ohio Department of Natural Resources website. You can also view the Plate 1, Rainfall Intensity Chart (PDF).
  1. Erosion & Sediment Control
  2. General Principles
  3. Storm Sewer Design Policy
  4. Storm Water Detention
Erosion & Sediment Control
In order to control pollution of streams and public waters the design engineer shall include in the construction plans sufficient requirements to control erosion and sedimentation during development. These requirements may include a designated sequence of operations, limits on area of surface to be disturbed, and temporary or permanent erosion control devices such as settling ponds or silt traps.

The developer and his contractor(s) shall abide by the requirements set forth in the Ohio Department of Natural Resources Division of soil and water districts "Urban Sediment Pollution Abatement Rules" Chapter 1501: 15-1-03, 15-1-04 and 15-1-05 of the Ohio Revised Code (Dated 11-1-79).