FLOOD07755

• County: Statewide
• Basin: Statewide
• Title: Engineering and Design Runoff from Snowmelt
• Date: 1/5/1960
• Prepared By: US Army Corps of Engineers
• Floodplain - Doc Type: Educational/Technical/Reference Information

e

e

e

EM 1110-2-1406
5 Jan 60

.

CHAPTER 10

OPTIJ\IUl\I SNOWJ\IELT RUNOFF FOR DESIGN FLOODS
Paragraph Paye
10-01 GE:\ERAL__ __ _ _ _ _ _ _ _ __ _ _ _ _ ___ ____ _ __ __ __ _______ ____ __ ____ __ __ _ __ - ___ ---- 33
10-02 F,\CTORS INYOLYED L\[ SKOWl\fELT DESIGN FLOODS__________________ 33
IO-Q;l OI'TDru~I SI\O\VPACK CO:'>JDITIONS____________________________________ 33
10-04 OPTI\IDf ~fETEOI{QLOGIC CONDITIONS_______________________________ 34
10-0" CO~IP(JTATJOX OF S:\OWl\IELT__________________________________________ 35
10-OIl OPTT~lC~f GIWliND CONDITIONS_______________________________________ 35
10-()7 EYAPOTRAKSpmATION LOSS_ _ _ _ ___ _ _ __ __ _ _ __ __ _ __ _ __ _ _ __ _ __ ___ _ __ __ _ _ _ 35

CHAPTER 11

:\IAXIMUM PROBABLE SNOWl\IELT FLOOD DERIVATION

11-01 GE:\ERAL___ _ _ _ __ _ _ _ ___ _ _ _____ _ __ __ __ _ __ _ _ _ _ _ __ __ ___ _ _ _ _ _ _ _ _ _ ____ --- - - - -- 36
11-02 THE SAL~lO:'>J mVER BASIN _ __ _ __ __ __ __ _ _ _ __ __ _ _ _ __ __ _ ____ __ _____ __ ____ _ 36
11-0:1 BASIN SNOW~IELTm__ _ __ _____ ___ __ __ __ __ _ __ ___ _ _ __ _ _ _____ ___ __ __ __ _ _ _ _ _ 36
11-04 BASIN S:\OWl\IELT COEFFICIENTS______________________________________ 37
1I-();; EFFECT OF \\'IND __ __ _ _ __ ______ __ __ __ __ __ _ ___ __ __ __ __ _ __ __ ___ __ __ _, __ __ _ 37
1I-01l S:\O\nIELT EQUATION, SALMON RIVER BASIN_________________________ 38
11-07 RECO:\STITUTION OF PAST FLOODS__ _____ __ __ __ __ __ ____ _ ___ __ __ __ __ __ _ 38
11-08 IUDIATfOX SKOWl\!ELT IN OpEN__,____________________________________ 38
11-09 Am TEl\IpEIUTURE FUKCTIONSm_____________________________________ 39
11-10 DEWpOII\T TEl\IPERA TURK__ ____ ___ __ ___ _ _ __ _ _ _ __ __ __ __ __ _ _ __ _________ 40
IHI CONYECTION-COKDEKSATION SNOWMELT_____________________________ 40
11-12 LOXGWAYE HADIATIO:'>J Sl\OWMELT IN FOREST_______________________ 40
II-I:J HAIXFALL_ __ _ __ _ ___ __ ____ __ __ _ ______ ___ __ _____ ___ ___ _ _ __ _ __ ___ __ _______ 40
11-14 RL':\OFF EXCESSES___ __ _ __ ___ __ ___ _ _ _ __ _ ___ __ _ __ _ ____ ___ _ _ _ __ __ _________ 40
11-15 S:\OW-Co\'EHED AREA____ __ _ __ __ _ __ __ _ _ _ _ _ _ _ __ ___ _____ __ __ _ ____________ 40
II-JI) SOIL l\fOlSTURE AXD S:'>JOW PRIyfING__________________________________ 42
11-17 BASfN STORAGE ROUTIKG__________hh________________________________ 42
11-18 RESCLTS OF RECONSTITUTIOKS________________________________________ 44
11-19 THE l\fAXll\ft:l\f PIWBABLE FLOOD_____________________________________ 44
11-20 CHITICAL SXOWPACK CHARACTERISTICS______________________________ 44
11-21 CRITICAL S:\O\V\fELT SEQUENCE__ ___ ______ _ _ _ ___ ___ _ ____ _ _ _ ___ ____ ___ 45
11-22 LOSSES TO IWJI\OFF_ __ _ ________ __ __ _ ____ ___ __ _ _ __ __ __ __ __ __ _ _ __ _ _ _ _ __ ___ 46
11-2:; BASE FLOW__ _ __ __ _ ___ _ _ ___ __ _ _ _ __ __ _ __ _ __ __ ___ __ __ _ __ __ _ _ _ __ __ _____ __ __ _ 46
11-24 COl\lpUTED l\lAxnru:VI PROBABLE FLOOD_____________________________ 46
11-25 EFFECT OF RAL\' __ _ _ _ _ _ _ __ _ _ _ _ _ ____ __ __________ __ __ __ _ __ ___ __ ____ ___ _ ___ 46

CHAPTER 12

STA::\DARD PROJEcT RAIN-ON-SNOW FLOOD DERIVATION

12-01 GENERAL____ __ _ _ __ __ _ _ _ _ _ _ _ _ _ _ _ _____ _ __ _ _______ __ _ _______ ___ __ __ ______ __ 47
12-02 SOUTH FOUK l\lcKENZIE HlVER BA':iL\'_________________________________ 47-12-Q;J ELEVATION BANDS ______ ___ __________________________________________ 47
12-04 STA:\DARD pRO.lEeT FLOOD DEVELOPl\mN'L__________________________ 47
12-05 AXTECEDE:\T STORl\L_____________ _________________________________ 48
12-06 SXOWpACK CONDITIONS____ ___________________________________________ 48
12-07 STANDAHD PHOJECT STOInL._________ ________________________________ 48
12-08 STA!\DARD PIW.lEeT SXOW_\!Er:r___ _ __ __ __ __ __ __ __ __ __ _ __ _ _ __ __ _ __ __ ___ 48
12-09 EFLUENCE OF SKOWpACK OX RUNOFFm u_ _______________________ 49

III