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I II I I I I I I I I I I I I I I I I I Development of any type in the floodplain shall be prohibited which may result in: a. rhe storage or processing of materials that in times of flooding are buoyant, flammable, explosive or otherwise potentially injur- ious to human, animal or plant life, b. The disposal of garbage or other solid waste materials. c. The human occupancy of structures either fixed or mobile permanent or temporary. d. Substantial solid debris being carried downstream by flood waters. e, Any obstruction which would impair the flow or storage capacity of the floodplain so as to cause damage to others. f. A substantial increase in sedimentation or erosion, 7. ALLUVIAL FANS: Within alluvial fans exist the potential for flash floods and mud- or debris-flows. Development should be prOhibited where such potential hazards exist. Disturbance in the drainage basin above the fan should not be permitted without first an evaluation of the effect on runoff and stability of the fan. C. SOIL AND SLOPE LIMITATIONS Sase data regarding soil and slope limitations was obtained from the Chaffee-LAKE ,ll,RE,ll, soi 1 survey. The survey evaluated each soi 1 type in terms of degree and 1 im- itation for septic tank absorption fields, sewage lagoons, shallow excavations, dwellings without basements and local streets and roads. 1, SOIL LIM1TATIDNS FOR SEPTIC TANKS, DWELLINGS, AND ROADS: A septic tank absorption field is defined herein as a subsurface drain system in- tended to di s tri bute effl uent from a septi c tank into natural soil. Soi 1 properti es which affect absorption are permeability, depth to water table or rock, and suscep- tibility for flooding. ~wellings aloe assumed to have no basements and are supported by foundation footings placed in undisturbed soil. Soil properties that affect capacity to support the load are wetness, susceptibility to flooding, density, plasticity, texture and shrink- swell potential. ~oads which might be constructed are assumed to have an all-weather surface compo- sition of asphalt or concrete, Soil properties affecting road construction are not- ed as follows: -Soil material -Shrink-s~ell potential -Wetness and Flooding -Slope -Depth to bedrock -Amount of cut and fill The introduction of the above cultural features into the existing landscape could have a considerable impact upon the environment. As such each proposed activity shoul d be eva 1 uated on its own meri tin order to determi ne speci fi c impacts. It would be reasonable to assume that areas having severe limitations should be eliminated as having any future develooment potential for dwelling units, septic 5