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

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property (i.e., development, irrigation ditches, existing
detention facilities, culverts, storm sewers) along the
entire path of drainage. Basins and divides are to be
identified and topographic contours are to be included.

b)

Floodplain Information: The location of any defined
floodplains on the property shall be shown.

Drainage Plan: Map(s) of the proposed development at a
scale of 1" = 20' to 1" = 200' on a 24" x 36" drawing
shall be included. The plan shall show the following:

c)

1. Existing and (if available) proposed topographic
contours at a 2-foot maximum interval. The
contours shall extend a minimum of 100 feet beyond
the property lines.
2. Property lines and easements with purposes noted.
3. streets, indicating ROW width, flowline width, curb
type, sidewalk, and approximate street slopes.
4. Existing drainage facilities and structures,
including irrigation ditches, roadside ditches,
crosspans, drainageways, gutter flow directions,
and culverts. All pertinent information such as
material, size, shape, slope, and location shall
also be noted.
5. Location and type of pertinent major drainage
facilities identified in the Comprehensive Drainage
Plan relevant to the proposed development.
6. Locations of other utilities.
7. Overall drainage area boundary and drainage sub-
area boundaries.
8. Proposed type of street flow (i. e., vertical or
combination curb and gutter), roadside ditch,
gutter, slope and flow directions, and cross pans.
9. Proposed storm sewers and open drainageways,
including inlets, manholes, culverts, and other
appurtenances, including riprap protection.
10. Proposed outfall point for runoff from the
developed area and facilities to convey flows to
the final outfall point without damage to
downstream properties.
11. Routing and accumulation of flows at various
critical points for the initial storm runoff listed
on the drawing using the format shown in Table 2-1.
12. Routing and accumulation of flows at various
critical points for the major storm runoff listed
on the drawing using the format shown in Table 2-1.
13. Volumes and release rates for detention storage
facilities and information on outlet works.
14. Location and elevations of all existing floodplains
affecting the property.

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