FLOOD04322

• County: Statewide
• Community: State of Colorado
• Stream Name: All
• Basin: Statewide
• Title: Benefit-Cost Analysis for Urban Drainage Planning
• Date: 3/1/1974
• Prepared For: UDFCD
• Prepared By: CSU
• Floodplain - Doc Type: Educational/Technical/Reference Information

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Development of the future hydrology will require estimation

of the type and extent of future development. This information

will usually be available at the planning departments of the

local jurisdictions within the study area. Lacking any usable

data, the engineer is responsible for making his own predic-

tions. It is recommended that the services of local planners

be enlisted. Local planners will be familiar with the existing

development, local subdivision regulations, community preferences

and other factors that will affect the type of development. The

limit of the development will depend on factors such as topo-

graphy, soil type and political boundaries. Encroachment into

the floodplain is an item of considerable significance, since

flood damages are directly related to development within the

floodplain. This will be affected by existing regulations such

as floodplain ordinances, community awareness of flooding poten-

tial and consequences, and development pressures. The engineer

must estimate the probable encroachment which would result

without the benefit of the results of his flood control study.

It is also desirable to know how the present situation

compares with the future in terms of the flood magnitudes and

resulting damages. This will require the development of flood

hydrology for the existing situation. The same recurrence

intervals should be used as for the future hydrology. Defini-

tion of the existing situation is not required for the benefit-

~ Leonard Rice Consolting Water EnglOeers, Inc.