FLOOD10222

• County: El Paso
• Community: Colorado Springs
• Basin: Arkansas
• Title: The City of Colorado/Springs/El Paso County Drainage Criteria Manual
• Date: 11/1/1986
• Prepared By: Colorado Springs
• Floodplain - Doc Type: Educational/Technical/Reference Information

A DBPS shall show the conduits, channels, natural drainage courses,
major retention reservoirs, easements, culverts and all other major
hydraul ic facil ities which are required to provide for the drainage and
control of surface waters within said basins and to carry such waters to
designated pOints of outflow or discharge. Sub-basins within designated
drainage basins shall be delineated at approximately 130 acres in
contributing area. The studies shall include an estimate of the cost of
providing the said drainage facil ities, the computation of such costs to
include the expense of the studies. The estimated cost per acre of
providing said facilities shall be determined within each drainage basin
by dividing the number of acres within said drainage basin into the total
cos t as herei n provi ded. Large open pub 1 i c park areas shall not be
included in total area. City/County funding participation in each case
shall be detennined by the City Council and County Commissioners as
recommended by the Storm Drainage Board. Thi s per acre cos t shall be
known as the unit drainage fee. The unit drainage fee is discussed in
more detail in Chapter 3.

Master Development Drainage Plan - A detailed Master Development Drainage
Plan (MDDP) will be prepared for new phased site developments within a
given drainage basin. The purpose of the MDDP is to complete drainage
planning for the total proposed development before embarking on individual
phases. Site requirements for the new developments will be identified in
the MDDP, including public improvements. The MDDP must identify hydrology
and hydraulics of existing/proposed drainageways and appurtenant
structures that are within and tributary to a proposed development. This
hydrology should be compatible with the DBPS at each 130 acre outfall.
Changes as proposed in the MDDP, must be analyzed within the context of
the DBPS to detennine impacts on downstream users. The MDDP will govern
the general treatment of drainageways from a safety and maintenance pOint
of view. The plan outlines the methods which need to be used for the
protection of public facilities such as bridge crossings and utilities
plus the protecti on of pri vate property adj acent to the banks of the
drainageways. Right-of-way requirements must be delineated on the plan
for all open channel drainageways, storage facilities and other drainage
st ru ctures.

A Master Development Drainage Plan shall be required for any phased
res i denti a 1, commerc i a 1 or indus tri a 1 development greater than 10 acres
before any approval for land annexation, rezoning or subdivision or
whenever there wi II be significant impacts to the basin upon review by
City/County personnel.

Preliminary Drainage Report - The purpose of a Preliminary Drainage Report
(PDR) is to identify and propose specific solutions to drainage problems
that would otherwise occur as a result of proposed development. Detailed
analyses of drainage basin hydrOlogy and hydraulics is required.
Alternative solutions to drainage problems will be noted and the capacity
of drainage facil ities to pass developed storm water runoff downstream
from the new development evaluated. Specific improvements, including open

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