FLOOD06658

• County: Arapahoe
• Community: Littleton
• Basin: South Platte
• Title: Union Ave Dam Boatshute
• Date: 9/1/1989
• Prepared For: Littleton
• Prepared By: BOR
• Floodplain - Doc Type: Community File

Table 1, . Average monthly South Platte riverflows at Littleton, Colorado,
and average Englewood diversions.

Average riverflows Englewood
Month {ft'/sl diversions...
1982-85 1987*. 1972-81 (ft'js)
(wet period) 1986
May 1,300 2,600 700 17
June 1,000 1,200 600 20
July 700 400 400 22
August 700 300 200 25
September 300 100 100 t5

* Personal communication, Bob Ferguson, I/IIWE, 1988.
** Maximum discharge 1982-1987, 3,700 ft'/s, May 27,1987.
*** Englewood diversions water right is 70 ft'/s, operational flow
100 ft'js.

Table 2 , - Velocity comparison in front of primary Englewood
water intake with high wall and low wall
(0 = 260 ft'js) (OEng_ = 30 ft'js)

Radial qate open
(ft) (percent)

Veloctties (ftjs)
Point 1*
High wall Low wall

0.5
1.0
2.0
3.0
4.0
5.0
6.0
8.0

6
12
25
38
50
63
75
100

1.8
2.5
4.7
5.1
8.t
8.3
8.3
8.6

1.1
1.4
1.7
2.2
3.7
4.4
4.7
4.7

* Readings were taken 0.5 foot off the bottom, 38 feet upstream from the sluice
gate.

15