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

B. Drainage Concept

1. EffectivE!ness of drainage design to control damage
from storm runoff
2. InfluenCE! of proposed development on the
Comprehensive Drainage Plan recommendations

VII. References

VIII.

2.3.2

Reference all criteria and technical information used.

Appendices

A.

Hydrologic Computations

L Land use assumptions regarding' adjac:ent properties
2. Initial and major storm runoff at specific design
points
3. Historic and fully developed rune,ff computations at
specific design points
4. Hydrographs at critical design point.s
5. Time of concentration and runoff coefficients for
each basin
6. A computer disk of all hydrologic modeling (CUHP,
EPA SWMM, etc.) necessary to support analysis and
conclusions in the report;: documentation of
modeling efforts will be in :sufficient detail to
allow replication of results.

B. Hydraulic computations (Optional for Preliminary)

1. Culvert capacities
2. storm se,.'er capacity, including energy grade line
(EGL) and hydraulic grade line (HGL) elevations for
culverts 30" or larger
3. Gutter and street capacity as c:oDlpare,d to allowable
4. storm inlet capacity including inlet control rating
at connection to the storm se..rer
5. Open channel design
6. Check structure and/or channel drop design
7. Detention area/volume capacity imd clutlet capacity
calculations; depths of detent:icm basins
8. Downstream/outfall system capa<:ity to the Major
Drainageway ~ystem.
,

preliminary Submittal: Plan Contel~l

a) General Location Map: All drawings s;hall be 24" x 36".
A map shall be. provided in sufficient detail to identify
drainage flows entering and leavin~r t:he development and
general drainaq-e patterns. The map should be at a scale
adequate to sh':lw the path of all drainage from the upper
end of any off-site basins to a ma~ior drainageway. The
map shall identify any major fa<:ilities from the

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