FLOOD00281

• County: Larimer
• Community: Greeley
• Title: Design Criteria and Construction Specifications volume 2 of 5 Storm Drainage Criteria
• Date: 10/1/1997
• Prepared For: Greeley
• Prepared By: Department of Public Works
• Floodplain - Doc Type: Educational/Technical/Reference Information

1. ReferencE~ to major drainageway planning studies
such as t:he City Comprehensive Drainage Plan, flood
hazard dE!lineation reports, flood insurance rate
maps
2. Major baf;in drainage characteristics, existing and
planned land uses
3. Identific;ation of all irrigation facilities within
the basin which will influence or be influenced by
the local drainage

B. Sub-basin Description

1. Discussion of historic drainagE! patterns of the
property
2. Discussion of off-site drainage flo'" patterns and
impact on development under existing and fully
developed basin conditions as defined by the
Planning Department

III. Drainage Design Criteria

A. Regulations: Discussion of the optional provisions
selected or the deviation from the criteria, if any, and
its justification.

B. Development criteria Reference and constraints

1. Discussion of previous drainage studies and/or
pertinent. master plans for the sit:e in question
that influence or are influenced by the drainage
design and how the plan will affect drainage design
for the site
2. Discussion of the effects of adjacent drainage
studies
3. Discussion of the drainagE~ impact of site
constraints such as streets and transportation
facilities, utilities, existing structures, and the
development or site plan

C. Hydrological criteria

1. Identify design rainfall
2. Identify runoff calculation method
3. Identify detention discharge and storage
calculation method
4. Identify design storm recurrence interval
5. Discussion and justification of other criteria or
calculation methods used that are not presented in
or referenced by the criteria

D. Hydraulic criteria

1. Identify various capacity references

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