FLOOD10000

• County: Bent
• Community: Las Animas
• Stream Name: Arkansas River
• Basin: Arkansas
• Title: Las Animas Local Protection Project Design Memo Number 1 Hydrology
• Date: 9/1/1967
• Prepared For: Las Animas
• Prepared By: US Army Corps of Engineers
• Floodplain - Doc Type: Project

TABLE 9
WIND DATA
PUEBLO MEMORIAL AIRPORT
Mean
Hourly Fastest Mile
Speed Prevailing Speed
Month (m.p.h.) Direction (m.p.h.) Direction Year
Jan 7.7 W 80 W 1950
Feb 8.3 W 56 NW 1963
Mar 9.5 W 68 N 1952
Apr 10.0 WNW 72 N 1961
May 9.3 SE 66 NW 1961
Jun 8.9 SE 63 N 1960
Jul 8.2 SE 73 NE 1964
Aug 7.4 W 68 N 1962
Sep 7.5 SE 56 N 1941
Oct 7.0 W 72 N 1964
Nav 7.4 W 61 N 1959
Dec 7.7 W 70 W 1964
Annual 8.2 SSE 80 W 1950
Years
of
Record 24 15 25 25

III - RUNOFF AND STREAMFLOW OF RECORD

3-01. GeneraZ.- The Arkansas River is a typical mountain stream
from the headwaters to Canon City. Near Canon City the river emerges
from the mountains through Royal Gorge, a canyon with steep walls over
a thousand feet high. Stream gradients exceed SO feet per mile above
Canon City, decreasing to about 10 feet per mile at Pueblo. Below Pueblo,
the stream gradient continues to decrease and the flood plain widens.
The stream gradients in the vicinity of Las Animas average about 5 feet
per mile on the Arkansas River and 8 to 9 feet per mile on the Purgatoire
River.

3-02. StreamfZ~ eharaeteristies.- Arkansas River floods are of
two general types. One type is the "spring flood" which results from
melting snow and is often augmented by stom runoff. The other type is
the "summer flood" which results entirely 'from stom runoff. Spring
floods are characterized by moderate rates of flow for long durations
with large volumes of runoff. Summer floods are characterized by high
rates of flow with smaller volumes of runoff.

10