The Water Encyclopedia: Hydrologic Data and Internet Resources - Chapter 5 ppsx

Table 5A.2 ContinuedName DrainageAreamL2 Period ofAnalysis 7-Day,10-YearLow Flowft3/sec AverageDischargeft3/sec 100-YearFloodft3/sec Little Colorado Subregion Upper Gila Subregion Middle

Surface Water Christopher Spooner

CONTENTS

Section 5A Rivers 5-2 Section 5B Lakes 5-39 Section 5C Waterfalls 5-64 Section 5D Glaciers and Ice 5-68 Section 5E Floods 5-93 Section 5F Flood Prevention 5-126 Section 5G Flood Controls Works 5-128 Section 5H Water Areas — United States 5-130 Section 5I Oceans and Seas 5-142

5-1

Atchaf ala

ya Riv er

White R

R er Illinois

R

Wab

h R

Ohio Riv er

River

CumberlandR

R Tennessee

St L

aw

renc

eRer

Hudson

R

De

lawa

R

EXPLANATION 20,000 ft3 sec −1

50,000 ft3 sec −1

100,000 ft3 sec −1

250,000 ft3 sec −1

500,000 ft3 sec −1

Rivers shown are those whose average flow at the

mouth is 17,000 ft3 sec −1 or more.

Average flow of Yukon River, Alaska, is 240,000

ft3 sec −1.

100

100 0

0 100

100 200 200

300 km

300 MILES

Figure 5A.1 Large rivers in the United States (From Iseri, K.T., and W.B Langbein, Large Rivers of the United States, U.S Geol SurveyCircular 686, 1974.)

Table 5A.1 Average Discharge at Downstream Gaging Stations on Large Rivers of the United States, 1931–1960, and 1941–1970

Drainage Area(Square Miles)

Average Discharge(1931–1960)(ft3/sec)

Average Discharge(1941–1970)(ft3/sec)

Continuation of Red River

b Includes diversion from Mississippi River through Old River or Old River diversion channel

Unadjusted for diversion by New York City reservoirs since 1954

h October 1946 to September 1970 (24 years)

i

American River and Yolo bypass have been added

j Formerly at Ogdensburg, NY

k

Furnished by the U.S Army Corps of Engineers through International St Lawrence River Board of Control

l Average is for 1957–1970; station operated only since 1956

Source: From Iseri, K.T., and W.B Langbein, 1974, Large Rivers of the United States, U.S Geol Survey Circular 686

Table 5A.2 Flow of Selected Streams in the United States

Name

DrainageArea(mL2)

Period ofAnalysis

7-Day,10-YearLow Flow(ft3/sec)

AverageDischarge(ft3/sec)

100-YearFlood(ft3/sec)Alabama

South Atlantic–Gulf Region Choctawhatcheee-Wseambia Subregion

Mobile–Tombigbee Subregion

19311937–1983

1929–1960

Tennessee RegionMiddle Tennessee-Elk Subregion

AlaskaAlaska RegionSoutheast Alaska Subregion

1938–1983

South-Central Alaska Subregion

Southwest Alaska Subregion

Yukon Subregion

1950–1983

Northwest Alaska Subregion

Arctic Subregion

ArizonaLower Colorado River Basin

(Continued)

Table 5A.2 (Continued)

Name

DrainageArea(mL2)

Period ofAnalysis

7-Day,10-YearLow Flow(ft3/sec)

AverageDischarge(ft3/sec)

100-YearFlood(ft3/sec)

Little Colorado Subregion

Upper Gila Subregion

Middle Gila Subregion

Salt Subregion

ArkansasLower Mississippi RegionMississippi River Main Stem

Lower Mississippi–St Francis Subregion

St Francis River Basin

1978–1981

1978–1981Lower Red–Ouachita Subregion

1946–1984Arkansas–White–Red RegionUpper White SubregionWhite River Basin

1939–1983

Table 5A.2 (Continued)

Name

DrainageArea(mL2)

Period ofAnalysis

7-Day,10-YearLow Flow(ft3/sec)

AverageDischarge(ft3/sec)

100-YearFlood(ft3/sec)

Red–Sulphur SubregionRed River Basin

CaliforniaCalifornia RegionSacramento Subregion

Tulare–Buena Vista Lakes and San Joaquin Subregions

Southern California Coastal Subregion

12 Santa Clara River, Los Angeles–

Ventura County Line

Central California Coastal Subregion

Klamath–Northern California Coastal Subregion

Great Basin RegionCentral Lahontan Subregion

ColoradoMissouri RegionNorth and South Platte Subregions

(Continued)

Table 5A.2 (Continued)

Name

DrainageArea(mL2)

Period ofAnalysis

7-Day,10-YearLow Flow(ft3/sec)

AverageDischarge(ft3/sec)

100-YearFlood(ft3/sec)Arkansas–White–Red Region

Upper Arkansas Subregion

Upper Colorado RegionColorado Headwaters Subregion

San Juan Subregion

ConnecticutNew England RegionConnecticut SubregionConnecticut River Basin

Connecticut Coastal SubregionThames River Basin

Quinnipiac River Basin

Housatonic River Basin

(Continued)

Table 5A.2 (Continued)

Name

DrainageArea(mL2)

Period ofAnalysis

7-Day,10-YearLow Flow(ft3/sec)

AverageDischarge(ft3/sec)

100-YearFlood(ft3/sec)Saugatuck River Basin

DelawareMid-Atlantic RegionDelaware SubregionChristina River Basin

Upper Chesapeake SubregionIndian River Basin

Nanticoke River Basin

FloridaSouth Atlantic–Gulf RegionAltamaha–St Marys Subregion

St Johns Subregion

Southern Florida Subregion

Peace–Tampa Bay Subregion

Suwannee Subregion

1933–1983

1942–1983Ochlockonee Subregion

Apalachicola Subregion

Choctawhatchee–Escambia Subregion

GeorgiaSouth Atlantic–Gulf RegionOgeechee–Savannah Subregion

Altamaha–St Marys Subregion

1936–1978

(Continued)

Table 5A.2 (Continued)

Name

DrainageArea(mL2)

Period ofAnalysis

7-Day,10-YearLow Flow(ft3/sec)

AverageDischarge(ft3/sec)

100-YearFlood(ft3/sec)

Suwannee Subregion

Apalachicola Subregion

1928–19311937–1983

1929–1983Alabama Subregion

Tennessee RegionMiddle Tennessee–Hiawassee Subregion

HawaiiHawaii RegionKauai Subregion

1 East Branch of North Fork Wailua River

Pacific Northwest RegionKootenai–Pond Oreille–Spokane Subregion

Pend Oreille River Basin

1930–1984Spokane River Basin

Upper Snake Subregion

9 Big Wood River below Magic Dam,

Richfield

Middle Snake Subregion

1943–1984

(Continued)

Table 5A.2 (Continued)

Name

DrainageArea(mL2)

Period ofAnalysis

7-Day,10-YearLow Flow(ft3/sec)

AverageDischarge(ft3/sec)

100-YearFlood(ft3/sec)

Lower Snake Subregion

1920–1984

1925–1984Illinois

Upper Mississippi RegionUpper and Lower Illinois SubregionsIllinois River Main Stem

Illinois River Basin–Tributaries

Rock SubregionRock River Basin

Upper Mississippi–Kaskaskia–Meramec SubregionKaskaskia and Big Muddy River Basins

IndianaOhio RegionGreat Miami SubregionWhitewater River Basin

Wabash SubregionWabash River Main Stem–White River Basin–Patoka River Basin

(Continued)

Table 5A.2 (Continued)

Name

DrainageArea(mL2)

Period ofAnalysis

7-Day,10-YearLow Flow(ft3/sec)

AverageDischarge(ft3/sec)

100-YearFlood(ft3/sec)

Upper Mississippi RegionUpper Illinois SubregionKankakee River Basin

Great Lakes RegionSouthestern Lake Michigan Subregion

St Joseph River Basin

Western Lake Erie SubregionMaumee River Basin

IowaUpper Mississippi RegionMississippi River Main Stem

Northeast Iowa River Basini

1919–19271929–19301932–1983

Iowa–Cedar River Basinj

Skunk River Basinj

Des Moines River Basink

1911–1968

Missouri RegionMissouri River Main Steml

(Continued)

Table 5A.2 (Continued)

Name

DrainageArea(mL2)

Period ofAnalysis

7-Day,10-YearLow Flow(ft3/sec)

AverageDischarge(ft3/sec)

100-YearFlood(ft3/sec)Western Iowa River Basino

1928–19321936–1983

1937–1983Southern Iowa River Basinp

1917–1983

Kansas, Gasconade–Osage, and Missouri–Nishnabotna Subregions

Kansas, Osage, and Missouri River Basins

8 Marais des Cygnes River, Kansas–

Missouri State line

Arkansas–White–Red RegionsMiddle Arkansas, Upper Cimarron, and Arkansas–Keystone Subregions

Arkansas River Basin

1921–1983

1922–1983Middle Arkansas and Neosho–Verdigris SubregionsWalnut, Verdigris, and Neosho River Basins

1921–1983

KentuckyOhio RegionMiddle and Lower Ohio SubregionsOhio River Main Stem

Salt River Basin

(Continued)

Table 5A.2 (Continued)

Name

DrainageArea(mL2)

Period ofAnalysis

7-Day,10-YearLow Flow(ft3/sec)

AverageDischarge(ft3/sec)

100-YearFlood(ft3/sec)Big Sandy–Guyandotte Subregion

Kentucky–Licking SubregionLicking River Basin

Kentucky River Basin

Green SubregionGreen River Basin

Cumberland SubregionCumberland River Basin

Tennessee RegionLower Tennessee Subregion

LouisianaSouth Atlantic–Gulf RegionPearl SubregionPearl River Basin

Lower Mississippi RegionMississippi River Main Stemu

Lower Red–Ouachita SubregionOuachita River Basin

Lower Mississippi–Lake Maurepas Subregion

Louisiana Coastal SubregionAtchafalaya–Teche–Vermillion and Calcasieu–Mermentau River Basin

1939–1983

1939–19571962–1983Arkansas–White–Red RegionRed–Sulphur SubregionRed River Basin

Texas–Gulf RegionSabine SubregionSabine River Basin

(Continued)

Table 5A.2 (Continued)

Name

DrainageArea(mL2)

Period ofAnalysis

7-Day,10-YearLow Flow(ft3/sec)

AverageDischarge(ft3/sec)

100-YearFlood(ft3/sec)Maine

New England Region

St John Subregion

Maine Coastal Subregion

Penobscot Subregion

1931–1985

Saco Subregion

Maryland (and the District of Columbia)

Mid-Atlantic RegionPotomac Subregion

Upper Chesapeake Subregion

Susquehanna Subregion

Ohio RegionMonongahela Subregion

MassachusettsNew England RegionConnecticut Subregion

8 West Branch Westfield River,

Huntington

Merrimack Subregion

(Continued)

Table 5A.2 (Continued)

Name

DrainageArea(mL2)

Period ofAnalysis

7-Day,10-YearLow Flow(ft3/sec)

AverageDischarge(ft3/sec)

100-YearFlood(ft3/sec)

Massachusetts–Rhode Island Coastal Subregion

Connecticut Coastal Subregion

MichiganGreat Lakes RegionNorthwestern Lake Michigan and Southeastern Lake Michigan Subregions

1934–1984

1917–19191931–1984

Southwestern Lake Huron–Lake Huron Subregion

1940–1984

Southern Lake Superior–Lake Superior and St Clair–Detroit Subregions

1944–1984

MinnesotaUpper Mississippi RegionMississippi River Basinv

19311935–1981

19311935–1983

1934–1983

1931–1971

Table 5A.2 (Continued)

Name

DrainageArea(mL2)

Period ofAnalysis

7-Day,10-YearLow Flow(ft3/sec)

AverageDischarge(ft3/sec)

100-YearFlood(ft3/sec)

1931–1980

19321934–1983

1936–19371939–1983

1950–1983

St Croix Subregion

Souris–Red–Rainy RegionRed Subregion Red Lake River Basin

15 Otter Tail River, Orwell Dam Fergus

Falls

Rainy SubregionLittle Fork and Big Fork River Basins

1929–1983

1983Great Lakes RegionWestern Lake Superior Subregion

MississippiLower Mississippi RegionLower Mississippi–Yazoo Subregion

Yazoo River Basin

1940–1984

Lower Mississippi–Big Black Subregion

Big Black River Basin

South Atlantic–Gulf RegionPearl SubregionPearl River Basin

Mobile–Tombigbee SubregionTombigbee River Basin

1928–1982Pascagoula SubregionPascagoula River Basin

Table 5A.2 (Continued)

Name

DrainageArea(mL2)

Period ofAnalysis

7-Day,10-YearLow Flow(ft3/sec)

AverageDischarge(ft3/sec)

100-YearFlood(ft3/sec)

MissouriUpper Mississippi RegionUpper Mississippi–Kaskaskia–Meramec Subregion

Lower Mississippi RegionLower Mississippi–St Francis Subregion

St Francis River Basin

Missouri RegionGasconade–Osage and Chariton–Grand Subregions

Osage and Grand River Basins

Arkansas–White–Red RegionUpper White SubregionWhite River Basin

MontanaMissouri RegionMissouri River Basinx

1905–19061907–19081911–1983

1932–19831934–1930

1958–1983Yellowstone River Basiny

1946–1983

1933–1983Pacific Northwest RegionClark Fork Basinz

(Continued)

Table 5A.2 (Continued)

Name

DrainageArea(mL2)

Period ofAnalysis

7-Day,10-YearLow Flow(ft3/sec)

AverageDischarge(ft3/sec)

100-YearFlood(ft3/sec)Kootenai River Basinz

NebraskaMissouri RegionMissouri River Main Stemaa

Niobrara Subregion

North Platte Subregion

South Plate Subregion

Kansas SubregionBlue River Basin

1930–1983Nevada

Lower Colorado RegionsLower Colorado–Lake Mead Subregion

1916–19181928–19311944–1983

Great Basin RegionBlack Rock Desert–Humboldt Subregion

Humboldt River Basin

1911–1983

(Continued)

Table 5A.2 (Continued)

Name

DrainageArea(mL2)

Period ofAnalysis

7-Day,10-YearLow Flow(ft3/sec)

AverageDischarge(ft3/sec)

100-YearFlood(ft3/sec)Central Lahontan Subregion

Walker Lake Basin

1920–19241925–19351939–19411942–19431944–1983Carson River Basin

Truckee River Basin

Central Nevada Desert Basins Subregions

New HampshireNew England RegionAndroscoggin Subregion

1927–1983

7 Merrimack River, Goffs Falls

Manchester

Connecticut Subregion

1982–1983

10 Ammonoosuc River, Bethlehem

Junction

1914–1983New Jersey

Lower Hudson–Long Island SubregionHackensack and Passaic River Basins

Raritan River Basin

5 South Branch Raritan River, High

Bridge

7 Raritan River below Calco Dam Bound

Brook

(Continued)

Table 5A.2 (Continued)

Name

DrainageArea(mL2)

Period ofAnalysis

7-Day,10-YearLow Flow(ft3/sec)

AverageDischarge(ft3/sec)

100-YearFlood(ft3/sec)Delaware and Lower Hudson–Long Island Subregions

Atlantic Coastal Basins

Delaware SubregionDelaware River Basin and Streams Tributary to Delaware Bay

17 McDonalds Branch, Lebanon State

Forest

New MexicoArkansas–White–Red RegionhhUpper Canadian SubregionCanadian River Basin

Rio Grande RegionUpper and Lower Pecos Subregions

Pecos River Basin

Rio Grande River Basin (main stem)ll

Upper Colorado RegionSan Juan Subregion

Lower Colorado Regionoo

New YorkMid-Atlantic RegionUpper Hudson Subregion

Great Lakes RegionSouthwestern and Southeastern Lake Ontario Subregions

(Continued)

Table 5A.2 (Continued)

Name

DrainageArea(mL2)

Period ofAnalysis

7-Day,10-YearLow Flow(ft3/sec)

AverageDischarge(ft3/sec)

100-YearFlood(ft3/sec)Northeastern Lake Ontario–Lake Ontario–St Lawrence Subregion

12 West Branch Oswegatchie River,

Harrisville

North CarolinaSouth Atlantic–Gulf RegionChowan–Roanoke Subregion

Cape Fear Subregion

Pee Dee Subregion

Tennessee RegionTennessee Subregion

North DakotaSouris–Red–Rainy RegionSouris and Red SubregionsSouris River and Red River of the North Basins

6,700qq

1938–1983

1938–1983

1,650qq

OhioOhio RegionMuskingum Subregion

(Continued)

Table 5A.2 (Continued)

Name

DrainageArea(mL2)

Period ofAnalysis

7-Day,10-YearLow Flow(ft3/sec)

AverageDischarge(ft3/sec)

100-YearFlood(ft3/sec)Scioto Subregion

1939–1984

1951–1984

Great Miami Subregion

Great Lakes RegionWestern Lake Erie SubregionMaumee River Basin

1940–1984

1921–19351939–1984Southern Lake Erie SubregionCuyahoga River Basin

1927–19351940–1984Oklahoma

Arkansas–White–Red RegionArkansas River Basin, Salt Fork Arkansas River and Cimarron River Basin,Verdigris River and Grand (Neosho) River Basins, and Canadian River Basinsrr

Red River Basinss, Washita River Basin

OregonPacific Northwest RegionOregon Closed Basins Subregion

(Continued)

Table 5A.2 (Continued)

Name

DrainageArea(mL2)

Period ofAnalysis

7-Day,10-YearLow Flow(ft3/sec)

AverageDischarge(ft3/sec)

100-YearFlood(ft3/sec)

1915–19161918–19211939–1983Middle Snake Subregion

Middle Columbia Subregion

1907–1983Willamette Subregion

Oregon–Washington Coastal Subregion

Rogue River Basin

California RegionKlamath–Northern California Coastal Subregion

Klamath River Basin

1930–1983PennsylvaniaMid-Atlantic RegionDelaware SubregionDelaware River Main Stem

Schuylkill River Basin

Susquehanna SubregionSusquehanna River Main Stem

West Branch Susquehanna River Basin

10 West Branch Susquehanna River,

Lewisburg

Juniata River Basin

Potomac Subregion

Ohio RegionAllegheny Subregion

(Continued)

Table 5A.2 (Continued)

Name

DrainageArea(mL2)

Period ofAnalysis

7-Day,10-YearLow Flow(ft3/sec)

AverageDischarge(ft3/sec)

100-YearFlood(ft3/sec)Monongahela Subregion

Upper Ohio SubregionOhio River Main Stem

Puerto RicoCaribbean RegionPuerto Rico SubregionNorth Coast Area

2 Rio Grande de Arecibo, Central

Cambalache

East Coast Area

South Coast Area

1971–1985

West Coast Area

Rhode IslandNew England RegionMassachusetts–Rhode Island Coastal Subregion

Blackstone River Basin

3 South Branch Pawtuxet River,

Washington

Pawcatuck River Basin

South CarolinaSouth Atlantic–Gulf RegionPee Dee SubregionLower Pee Dee River Basin

Edisto–Santee SubregionSantee River Basin

(Continued)

Table 5A.2 (Continued)

Name

DrainageArea(mL2)

Period ofAnalysis

7-Day,10-YearLow Flow(ft3/sec)

AverageDischarge(ft3/sec)

100-YearFlood(ft3/sec)

1925–1983

Edisto–South Carolina Coastal Basin

Ogeechee–Savannah SubregionSavannah River Basin

1896–19061925–1983South DakotaMisouri RegionMissouri River Main Stemzz

Western Tributariesccc

Eastern Tributarieseee

TennesseeOhio RegionCumberland SubregionCumberland Basin

Tennessee RegionUpper Tennessee, Middle Tennessee–Hiwassee, Middle Tennessee–Elk, and Lower Tennessee Subregions

Tennessee Basin

Table 5A.2 (Continued)

Name

DrainageArea(mL2)

Period ofAnalysis

7-Day,10-YearLow Flow(ft3/sec)

AverageDischarge(ft3/sec)

100-YearFlood(ft3/sec)

1920–1985

Lower Mississippi RegionLower Mississippi–Hatchie SubregionLower Mississippi Basin

1966–1985

Arkansas–White–Red RegionCanadian–Red River Basinfff

Texas–Gulf RegionSabine–Neches–Trinity–San Jacinto River Basinggg

Brazos–Colorado River Basinhhh

Lavaca–Guadalupe–Nueces River Basiniii

Rio Grande RegionRio Grande Basinjjj

U.S Virgin IslandsCaribbean RegionU.S Virgin Islands Subregion

1979–19801982

Table 5A.2 (Continued)

Name

DrainageArea(mL2)

Period ofAnalysis

7-Day,10-YearLow Flow(ft3/sec)

AverageDischarge(ft3/sec)

100-YearFlood(ft3/sec)Guam, American Samoa, and the Trust Territory of the Pacific Islands

UtahUpper Colorado RegionColorado River Main Stemmmm

Upper–Coloradodolores SubregionDolores River Basin

Great Divide–Upper Green and Lower Green Subregions

Green River Basin

743

4,396ppp4,456

38,200

Gaging station: Period of analysis is for the water years used to compute average discharge and may differ from that used to compute otherstreamflow characteristics Streamflow characteristics: The 7-day, 10-year low flow is a discharge statistic; the lowest average dischargeduring 7 consecutive days of a year will be equal to or less than this value, on the average, once every 10 years The average discharge isthe arithmetic average annual discharges during the period of analysis The 100-year flood is the peak flow that has a 1-percent chance ofbeing equaled or exceeded in a given year The degree of regulation is the effect of dams on the natural flow of the river Abbreviations:DoZditto; mi2

Zsquare miles; ft3/secZcubic feet per second; Zinsufficient data or not applicable

a Less than 10 years of record Minimum discharge and maximum instantaneous discharge for period of record are shown.b

Record interrupted

c Adjusted for no-flow periods

d

Adjusted for high-outlier in period of record Did not use 1981 peak because it was regulated

e Adjusted for high-outlier in period of record

f

Sutter and Yolo Bypasses Carry Much of Floodflow Past Verona gage

g Regulation has Little Effect on High Floodflows

h

From Upper Mississippi River Basin Commission, 1978

i Within the Upper Mississippi–Black–Root, Upper Mississippi–Maquoketa–Plum, and Upper Mississippi–Iowa–Skunk–WapsipiniconSubregion (Seaber and Others, 1984)

j

Within the Upper Mississippi–Iowa–Skunk–Wapsipinicon Subregions (Seaber and Others, 1984)

k Within the Minnesota Des Moines Subregions(Seaber and Others, 1984)

l

Within the Missouri–Big Sioux, Missouri–Little Sioux, and Missouri–Nishnabotna Subregions (Seaber and Others, 1984)

m Flow Parameters Based Only on 1929–1931 and 1939–1956 Water Years

n

From U.S Army Corps of Engineers, February 1978

o Within the Missouri–Big Sioux, Missouri–Little Sioux, and Missouri–Nishnabotna Subregions (Seaber and Others, 1984)

p

Within the Missouri–Nishnabotna, Chariton–Grand, and Upper Mississippi–Salt Subregions (Seaber and Others, 1984)

q Based on period of analysis since regulation began These values are not based on detailed analyses, are approximate estimates,and are for information purposes only

(Continued)

Table 5A.2 (Continued)

r From flood-insurance hydrology study Based on detailed analyses of regulated-flow conditions

s

Prior to opening of Barkley–Kentucky Canal (1889–1965)

t Since the opening of Barkley–Kentucky Canal (1965–1983)

Data furnished by U.S Army Corps of Engineers

x Includes the Saskatchewan, the Missouri Headwaters, the Missouri–Marias, the Missouri–Musselshell, the Milk, and the Missouri–Polar Subregions

y Includes the upper Yellowstone, the Big Horn, the Powder–Tongue, the lower Yellowstone, and the Missouri–Little MissouriSubregions

z Contained within the Kootenai–Pend Oreille–Spokane Subregion

aa

Within the Missouri–Big Sioux, Missouri–Little Sioux, and Missouri–Nishnabotna Subregions

bb Analysee based on period of record since regulation began

cc Based on record to 1981

dd

Period of record not continuous

ee Adjusted for diversion and change in reservoir contents

ff

Analysis based no regulated period 1955–1984

gg Period of record not continuous

hh

Also includes parts of the Upper Arkansas, Upper Cimarron, Lower Canadian, North Canadian, and Red Headwaters Subregions

ii Fifteen years, prior to completion of Conchas Dam

jj

Twenty-four years, prior to completion of Ute dam

kk Twenty-one years (1963–1983), subsequent to completion of Ute Dam

ll Includes all or parts of Rio Grande Headwaters, Rio Grande–Elephant–Butte, Rio Grande–Mimbres, and Rio Grande Closed basinsSubregions

mm Thirty-two years, prior to closure of Cochiti Dam

nn

Ten years (1974–1983), subsequent to closure of Cochiti Dam

oo Includes parts of the Little Colorado, Upper Gila and Sonora Subregions

Drainage area excludes 8.2 mi2upstream form Lago Carite, flow from which is diverted to the Rio Guamani

xx Drainage area includes 39.7 mi2from headwaters of Lago Yahuecas (17.05 mi2), Lago Guayo (9.67 mi2), Lago prieto (9.50 mi2), andLago Toro (3.5 mi3) which does not contribute to surface runoff except at high stages

yy Analysis based on records collected since regulation began

zz

Within the Missouri–Oahe, Missouri–White, and Missouri–Big Sioux Subregions

aaa Station discontinued subsequent to construction of Oahe Dam in 1962

bbb Analysis based on period of record after regulation began

ccc

Within the Missouri–Oahe, Missouri–Little Missouri, Cheyenne, Missouri–White, and Niobrara Subregions

ddd Period of record not continuous

eee

Within the James and Missouri–Big Sioux Subregions

fff Within the Upper Canadian, Lower Canadian, North Canadian, Red Headwaters, Red–Washita, and Red–Sulphur Subregions.ggg

Within the Sabine, neches, Triniy, and Galveston Bay–San Subregions

hhh Within the Brazos Headwaters, Middle Brazos, Lower Brazos, Upper Colorado, and Lower Colorado–San Bernard CoastalSubregions

iii Within the Central Texas Coastal and Nueces–Southwestern Texas Coastal Subregions

jjj Within the Rio Grande–Mimbres, Rio Grande Amistad, Rio Grande Closed Basins, Upper Pecos, Lower Pecos, Rio Grande–Falcon,and Lower Rio Grande Subregions

kkk Discharge represents highest recorded Data available are not adequate to determine a discharge–frequency relation, but it isestimated to have exceeded the 100-year flood

lll Discharge represents highest recorded

mmm

Within the Upper Colorado–Dolores and Upper Colorado–Dirty Devil Subregions

nnn Approximate

ooo

Period of analysis not continuous

ppp Since completion of Flaming Gorge Reservoir in 1963

Mean Monthly Discharge (m 3 /sec)

River and Station

Basin Area

Period of Record

Mean Monthly Discharge (m /sec)

River and Station

Basin Area

Period of Record

Monthly and yearly averages rounded to three significant figures

Source: From UNESCO, 1971

Table 5A.4 Length of Principal Rivers in the United States and Canada

Note: Comprises rivers 600 miles or more in length Length represents distance to designated outflow from (a) original headwater ofnamed river where name applies to entire length of channel, or (b) upper limit of channel so named, usually the junction of twotributaries or headwater streams

Source: From Statistical Abstract of the United States 1986

Table 5A.5 Flowing Water Resources of the United States

Stream

Ordera Number

Streams

AverageLengthMiles

Total LengthMiles (L)

DrainageArea Sq

Miles (Ad)

Mean FlowFor AreaDrained(CFS)

Mean WidthFeet (W)

Mean DepthFeet (D)

MeanVelocityft/sec (V)

CalculatedDischargeCFS Z WDV

TotalSurfaceArea, AsSq

Miles(thousands)

TotalChannelStorageAcre Feet(millions)

33

33

Increased demand is causing significant competition among major users of water Streamflow in 14

of the 106 subregions is inadequate to support navigation, hydropower, recreation, fish, wildlife, and

other instream uses in an average year Inadequate means that 70% or more of the water is consumed

offstream during a given year, In a dry year, nine more subregions are in the 70% or more depletion

category.

Subregions with inadequate streamflow

70 % or more depleted in average year

70 % or more depleted in dry yearLess than 70 % depleted

Figure 5A.2 Inadequate surface water supply for instream use in the United States (From COUNCIL on Environmental Quality, 1981,

Environmental Trends.)

Table 5A.6 Velocity of Low Flows and Average Length of Streams in the United States

Water Resource Region

Mean Velocity(mi/hour)

Average StreamLength (miles)

Mean Depth atVelocities Given

in Col 1 (ft)

Mean Flow at Velocity

region For location of river basins see Figure 2.6

Table 5A.7 Annual River Flow Rates in Canada

From recorded flows except in Prairie basins where natural flows have been estimated

b Flow equalled or exceeded in 19 years out of 20

c

Flow equalled or exceeded in 1 year out of 20

d Excludes flow transferred into neighboring basin region; because this flow is recorded in importing basin, transfers have little effect onnational total

e Excludes inflow from United States portion of basin region

f

Excludes inflow from upper basin region

Source: From Pearse, P.H., Currents of change, Final Report Inquiry on Federal Water Policy, Ottawa, Canada, 1985

Table 5A.8 Longest Rivers of the World

Rank in World

World

Africa

(al-Bahr al-Abyad)

(al-Bahr al-Azraq)

America, North

(Continued)

Table 5A.8 (Continued)

Rank in World

America, South

Asia

(Continued)

Table 5A.8 (Continued)

Rank in World

Europe

Oceania

a

Conversions of rounded figures are rounded to nearest hundred miles or kilometres

Source: From Encyclopaedia Britannica, 15th edition, Copyright 1988 by Encyclopaedia Britannica, Inc Reprinted with permission

Table 5A.9 Large Rivers of the World

Drainage Area(Thousands of sq mi)

Average Discharge

at Mouth

North America

Department of Interior News Release, Feb 24, 1964

c Argentina and Uruguay

d

Tigris, Euphrates and Karun

Source: From Young, L.L., U.S Geological Survey, 1964

Martin, Palm Beach

700

Idaho

(Continued)