WSPC02336

• File Number: 8272
• Description: Colorado River - Colorado River Basin Salinity Control Program - CRBSCP
• State: CO
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 8/1/1993
• Author: DOI-BOR - BIA
• Title: Navajo Indian Reservation - Hogback-Upper Fruitland Canal - Ponding Tests and Seepage Rate Determinations
• Water Supply Pro - Doc Type: Report/Study

Hogback Canal - Calculations of Seepage rates for ponding tests.

Pond No. 1
'1

OG2~35

"

.

--r

a 22ft

~
<:=5.0

P w = b+ [ h2+~] 112(2)
P w = wetted perimeter
Pwl = 12+ [3.522+5.02]1/2(2) = 24.23
Pw2 = 12+ [3.402+4.82]1/2(2) = 23.76

1580 ft

~

A = 1/2 (a+b)h
A = cross sectional area

Al = 1/2(22+12)3.52 = 59.84 ft2
VI = Al (L) = 59.84(1580) = 94,547ft3
A2 = 1/2(12+21)3.40 = 56.10 ft2
V2 = A2(L) = 56.10(1580) = 88,638 ft3
6.V = V 1-V2 = 94,547 ft3

Aw = wetted area = Pw(L) Seepage =6.V f~/Avg. Aw ft2mme (days)
Awl = Pwl(L) = 38,283.4 ft2
Aw2 = Pw2(L) = 37,540.8 ft2 Seepage = 5,909 ft3/37,912ft2/2days = 0.08 ftlday

Average Aw = 37,912 ft2
Seepage minus evaporation] = 0.08 ftlday - 0.01 ftlday = 0.07 ftlday

Pond No.2

.

--r

a 18 ft

.84 ft 3.66 ft
~b=lOft

<:=4.0

P wI = 10+ [3.842+4.02] 1/2(2) = 21.09

Pw2 = 10+ [3.662+3.22]112(2) = 19.72

Awl = Pwl(L) = 29,526ft2
Aw2 = Pw2(L) = 27,608 ft2
Average Aw = 28,567 ft2

'I

~

Seepage minus evaporation] = 0.07 ftlday - 0.01 ftlday = 0.06 ftlday

.

1400ft

Al = 112(18+10)3.84 = 53.76 ft2
VI = Al (L) = 53.76(1400) = 75,264ft3
A2 = 1/2(17+10)3.66 = 49.41 ft2
V2 = A2(L) = 49.41(1400) = 69,174 ft3
8. V = V r V 2 = 6,090 ft3

Seepage = 6.V ft3/Avg. Aw ft2rrime (days)
Seepage = 6,090 ft3128,567 ft2/3days = 0.07 ftlday

] Evaportation value from Water Use Prodution, Functions of Selected Agronomic
Crops in NW New Mexico.

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