FLOOD00835

• County: Statewide
• Community: State of Colorado
• Title: Comprehensive Flood Plain Studies Using Spatial Data Management Techniques - Corps - Technical Paper No 47
• Date: 1/1/2001
• Prepared For: State of Colorado
• Prepared By: Hydrologic Engineering Center
• Floodplain - Doc Type: Educational/Technical/Reference Information

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T ABLE I. Adopted Land Use Categories, Trail Crcck.

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Category

"
.

Distribution of Land Use (Peu.:ent)
1975 1990

21.9

1. NATURAL VEGETATION - Heavy weeds. brush, scrub
areas, forest. woods.

2. DEVELOPED OPEN SPACE Lawns parks. golf cour.scs.
cemeteries.

3. LOW DENSITY RESIDENTIAL Single fall1il~': I unit
per 1/2 to 3 acres; average 1 unit per 1 ]/2 acres. Areal break-
down: 5% structures, 10'3 pavement. 50';; lawns, 37';
vegetation.

4. MEDIUM DENSITY RESWFNTlAL Single family:
Typical subdivision 101S; 1 unit per 1/5 to 1/2 acre. Avcr-
~e 1 unit per 1/3 :Jere. Areal breakdown: 10';; structures.
15'i; pavement, 45';; lawns, 3D"; vcgctaHon.

5.

HIGH DENSITY RESIDENTIAL Multi-family: Row
houses, apartments, townhousc~, etc.; structurcs on kss
than 115 ;Krc lots: avcrage 1 unit pcr 1/8 anc. AH'a1
breakdo"n: 25',' structurc. 15'; pavt'ment. 35'; lawns,
25';; vc~etati(Jn,

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6.

AGRICUl rURAL
!!rain, ~'tc.

CllltivatL'd land, row rr(lp~, SIll<J1I

7, INDUSTRIAL - Industrial ccnters :.lI1d parks, li~ht and
heav}" industry. Average 1 plant per 8 acrcs. Areal break-
duwn: 20',i. pavcment. 5W:; structure~, 30'; opcn SpJct'.

8. COMMERCIAL Shopping ~'entcrs Jnd "strip" cnlll-
mercial areas. AWfJ!!c 3 structures pcr acre. Areal break-
down: 30"; structures, y.; lawns, lU';; vegetation, 55';;
pavement.

9. PASTURE Livestock grazing :.Heas, rangl'~. meaduw,
agricultural opl'n areas, :.Ibandoncd crop l:.Ind.

10. WATER BOlllES
rivers,

Lakes, huge Jlonds, major streams,

52.4

2.6

I.]

39

4.9

2.3

11.6

0.5

4.4

2H.O

8.6

J.n

t2A

1.6

6.1

6.8

25.1

0.9

3.9

were adopted for the Trail Creek study and incorporated intu HEC-l to form the basic
tool for hydrologic computations. The SCS methods were adopted because at present
they represent a gencrally availablc technique that is responsive to land use considerations
and the methods have experienced large scale applications and could be readily auto.
mated, Loss rates are characterized by a curve number (C'N) which is a function ofland
cover (land use) and soil charal'tcristics (hydrologic soil group). The subbasin response to

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