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Storm Water Management Facilities Design Criteria
The
following criteria shall be followed when designing a Storm Water Management
Facility.
A. Design
storm - Storm water management facilities shall be designed to retain the
difference in the pre-development and post-development, twenty-five year,
24-hour storm event. The effect of the 100-year storm must be considered
and documented in the design of all storm water management facilities.
B.
Design calculation - Design calculations submitted must include, but are not
limited to, the following:
1.
Drainage area - Indicate if pre-development and post-development areas
differ.
2. List
area drainage types and run-off coefficient numbers for predevelopment and
post-development conditions.
3. Stage
- Storage curve for the proposed storm water management facility.
4. Stage
- Discharge curve for the outlet structure of the proposed storm water
management facility.
5. Inflow
and outflow hydrographs for pre-development and post-development conditions.
6.
Emergency spillway design calculations.
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