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<br />~. - 19 - <br />l' <br />1 <br /> Table 3 <br /> PEAK DISCHARGES (ds) <br /> 10 25 IRF SPF <br /> Out of Tarn 450 800 900 1200 <br /> Below Lehman Gulch 500 800 900 1300 <br />, Below Illinois Gulch 500 800 900 1400 <br />i <br />~- <br />" Below Sawmill Gulch 550 800 900 1400 <br />!i <br /> Below French Gulch 700 850 1200 1900 <br /> Below North Barton Gulch 750 850 1200 1950 <br /> Below Swan River 1050 1150 1250 2400 <br /> HAZARDS OF LARGE FLOODS <br /> <br />The amount and extent of damage caused by any flood <br />depends on the topography of the area flooded, depth and <br />duration of flooding, velocity of flow, and developments in <br />the flood plain. The occurrence of an Intermediate Regional <br />or Standard Project Flood on streams in the study area at <br />the present time would result in inundation of land adjacent <br />to the river, damage to residences, roads, streets, bridges <br />and culverts, public utilities, and interruption of traffic. <br />flood waters flowing at high velocity and carrying floating <br />debris create conditions hazardous to persons and vehicles <br />attempting to cross flood~d areas. High velocity flows <br />through Breckenridge can erode stream banks thereby threaten- <br />ing the foundations of buildings and bridge abutments and <br />creating hazard to curious spectators and occupants of struc- <br />tures. Cold nights during the early part of the runoff season <br />cause streets subject to shallow flooding to become glazed <br />ice. Sewage, garbage and other organic materials carried or <br />deposited by flood waters create hazards to health. Serious <br />problems could result in providing emergency medical, fire <br />and law enforcement services to areas isolated by floods. <br /> <br />~ Leonard Rice ConsuUing Water Engineers, Inc. <br />