Flood-frequency analysis for small natural streams in Georgia

Golden, Harold G.; Price, McGlone

doi:10.3133/ofr76511

Cited by 15 publications

(9 citation statements)

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“…Very little damage occurs along larger rivers. Specifically, curves relating 100-year flood peaks to drainage area for Utah (Berwick, 1962) are very close to those for Georgia (Golden and Price, 1976) for drainage areas smaller than 10 square miles but become much smaller for larger basins. For an equation of the form, Q = aAb where Q is the 100-year flood flow in cfs and A is the drainage area in square miles, the coefficients in the 100-year flood predicting equations for the various hydrologic regions of Georgia vary by a factor of 4.…”

Section: Overview Of Flood Hydrologymentioning

confidence: 72%

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FLOODPLAIN MANAGEMENT NEEDS PECULIAR TO ARID CLIMATES¹

James¹,

Larson²,

Hoggan³

et al. 1980

J American Water Resour Assoc

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Many practices followed uniformly nationwide in the federal flood control and floodplain management programs are inappropriate or even counter productive in the arid Utah climate. An analysis of the 130‐year Utah flood history, the structural and nonstructural flood programs in the state, and local perceptions obtained by field visits and interviews in 35 Utah communities revealed a number of such inefficiencies. Since flood flows dissipate quickly when they emerge from mountain watersheds onto desert lowlands, risks are concentrated near the apex of alluvial fans, include hazard from mud as well as water flow, and are compounded by canal interception of flood waters. Because of variation in the area flooded from one event to the next, floodplain mapping has tended to show risks too high in mapped areas and too low outside. Traditional channelization carries floods downstream past where they would dissipate naturally. The federal government needs to become more active in developing better flood hazard delineation and structural and nonstructural designs for arid areas. State government can help by providing a forum where communities can exchange experiences, reviewing structural designs prepared by local government, and providing local communities with technical expertise for dealing with federal agencies.

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Section: Overview Of Flood Hydrologymentioning

confidence: 72%

“…The exponent in Equation (1) of 0.225 for the envelope curve of Utah flood data (James, et al, 1980) is extremely small. Values for the five hydrologic regions of Georgia range from 0.57 to 0.68 (Golden and Price, 1976). Cummans,Collings, and Nassar (1974) report 0.86 for western Washington.…”

Section: Overview Of Flood Hydrologymentioning

confidence: 99%

FLOODPLAIN MANAGEMENT NEEDS PECULIAR TO ARID CLIMATES¹

James¹,

Larson²,

Hoggan³

et al. 1980

J American Water Resour Assoc

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“…For the purposes of comparison, only the 2-, 25-, and 100-year recurrence intervals are used. Golden and Price (1976) presented flood-frequency estimating equations for streams in Georgia that have drainage areas of less than 20 mi2. These equations were based on a multiple regression analysis.…”

Section: Introductionmentioning

confidence: 99%

COMPARISON OF METHODS FOR ESTIMATING FLOOD MAGNITUDES ON SMALL STREAMS IN GEORGIA¹

Hess¹,

Price

1989

J American Water Resour Assoc

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The U.S. Geological Survey has collected flood data for small, natural streams at many sites throughout Georgia during the past 20 years. Flood‐frequency relations were developed for these data using four methods: (1) observed (log‐Pearson Type HI analysis) data, (2) rainfall‐runoff model, (3) regional regression equations, and (4) map‐model combination. The results of the latter three methods were compared to the analyses of the observed data in order to quantify the differences in the methods and determine if the differences are statistically significant. Comparison of regression‐estimates with observed discharges for sites having 20 years (1966 to 1985) and 10 years (1976 to 1985) of record at different sites of annual peak record indicate that the regression‐estimates are not significantly different from the observed data. Comparison of rainfall‐runoff‐model simulated estimates with observed discharges for sites having 10 years and 20 years of annual peak record indicated that the model‐simulated estimates are significantly and not significantly different, respectively. The biasedness probably is due to a “loss of variance” in the averaging procedures used within the model and the short length of record as indicated in the 10 and 20 years of record. The comparison of map‐model simulated estimates with observed discharges for sites having 20 years of annual‐peak runoff indicate that the simulated estimates are not significantly different. Comparison of “improved” map‐model simulated estimates with observed discharges for sites having 20 years of annual‐peak runoff data indicate that the simulated estimates are different. The average adjustment factor suggested by Lichty and Liscum to calculate the “improved” map‐model overestimates in Georgia by an average of 20 percent for three recurrence intervals analyzed.

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“…Most of the soils of the six basins in this study were type B soils and a starting value of 0.15 was used for KSAT. The range and starting values of the other soil-moisture-accounting and infiltration parameters RR, BMSN, RGF, and PSP were obtained from Golden and Price (1976) and Inman (1983). The next step in calibrating the model was to optimize on effective impervious area using the parameter EAC with all the other parameters being held constant.…”

Section: Calibrationmentioning

confidence: 99%

Effects of urban flood-detention reservoirs on peak discharges in Gwinnett County, Georgia

Hess¹,

Inman²

1994

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Flood-frequency analysis for small natural streams in Georgia

Cited by 15 publications

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FLOODPLAIN MANAGEMENT NEEDS PECULIAR TO ARID CLIMATES¹

FLOODPLAIN MANAGEMENT NEEDS PECULIAR TO ARID CLIMATES¹

COMPARISON OF METHODS FOR ESTIMATING FLOOD MAGNITUDES ON SMALL STREAMS IN GEORGIA¹

Effects of urban flood-detention reservoirs on peak discharges in Gwinnett County, Georgia

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Flood-frequency analysis for small natural streams in Georgia

Cited by 15 publications

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FLOODPLAIN MANAGEMENT NEEDS PECULIAR TO ARID CLIMATES1

FLOODPLAIN MANAGEMENT NEEDS PECULIAR TO ARID CLIMATES1

COMPARISON OF METHODS FOR ESTIMATING FLOOD MAGNITUDES ON SMALL STREAMS IN GEORGIA1

Effects of urban flood-detention reservoirs on peak discharges in Gwinnett County, Georgia

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FLOODPLAIN MANAGEMENT NEEDS PECULIAR TO ARID CLIMATES¹

FLOODPLAIN MANAGEMENT NEEDS PECULIAR TO ARID CLIMATES¹

COMPARISON OF METHODS FOR ESTIMATING FLOOD MAGNITUDES ON SMALL STREAMS IN GEORGIA¹