ABE 527

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ABE 527 Computer Models in Environmental and
Natural Resources Engineering
Final Project
Presented by Ibrahim M M Aly
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Project Objectives- Design of a retention pond
for the Middle fork Wild cat Creek watershed,
design of culvert and study of the water polution
in that watershed.
Methods - Using HEC_1 Design of Culvert
L-THIA NPS pollution
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Middle Fork Wild Cat Creek watershed
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Middle Fork Wild Cat Creek watershed Streams
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CN(av) 340910.80/4347.181 78.42 S 1000/CN
10 2.75 inch
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http//danpatch.ecn.purdue.edu/sprawl/Tools/Runof
f/rain.htm   Rainfall Depth The rainfall depth
for Carroll County, Indiana, with a return period
of 25 years and a duration of 2 hour is 2.84
inches. Data is from Rainfall Frequency Atlas of
the Midwest, F.A. Huff and J.R. Angel, Midwestern
Climate Center and the Illinois State Water
Survey, Champaign, IL, 1992.    Rainfall Depth
The rainfall depth for Clinton County, Indiana,
with a return period of 25 years and a duration
of 2 hour is 2.99 inches. Data is from Rainfall
Frequency Atlas of the Midwest, F.A. Huff and
J.R. Angel, Midwestern Climate Center and the
Illinois State Water Survey, Champaign, IL, 1992.
   The average Rainfall Depth (P)
(2.842.99)/2 2.915 inch   The Runoff Depth
(Q) (P-.2S)2/(P.8S)
(2.915-.22.75)2/(2.915
.82.75)
1.0935 inch 2.78 cm
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  Total Runoff Volume 1.09352.54/1004347100
00
1,207,400 cubic meters   If we consider this
volume will accumulate in 2 hours, Discharge
Volume 168 cubic meter/ second    
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Assume a pond of 15 acre area Area
elevation  15 670 15 692   For the
outlet we use Centerline elevation of 670
ft. Discharge coefficient 0.6 Exponent
.5   Spillway configuration Crest Elevation 690
ft Exponent 1.5, Length 20 ft, discharge
coefficient 4.03. I also used 6 pipes of
24each for the outlet The pond peak flow is 811
cfs and the detention time is 11.20 hr That is
reduced from 2400 cfs
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The Culvert Design
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Using L-THIA NPS for avg. annual
estimation CN(avg.) 78.2946 (78.42 previous
calculation) Avg. annual runoff volume
1,428,038 cubic meters   Avg. annual runoff
depth 3.29 cm
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