FLOOD03288

• County: Morgan
• Community: Wiggins
• Stream Name: Kiowa Creek
• Basin: South Platte
• Title: Kiowa Creek at Wiggins Flood Warning System
• Date: 9/1/1990
• Prepared For: Wiggins
• Prepared By: US Army Corps of Engineers
• Floodplain - Doc Type: Floodplain Report/Masterplan

systems 10catE!d in Nebraska, Iowa and South Dakota. A
diagram illust:rating the maje)r component parts is shown in
Figure 4.
4.2.2 Description of Flood D,e1:ection Gage
The flood alarm consists of an Ademco 612 Tape Dialer
Alarm, mountE!d in a shelter, 1rlhich is attached to the down-
stream guardrail. The she11:er is mounted on top of a 18"
C.M,P. culvert: attached vertically to a bridge pier or wing
wall. The alarm is operated by 'three Consolidated Electric
company mercury-wetted float switches positioned vertically
on a rod within the culvert pipe. The pipe acts as a still-
ing well for the floats. The alarm is powered by one 6 Volt,
20 Amp-hour rechargeable batb~ry. The tape dialer alarm has
2 independent channels; providing for low stage and high
stage alarms. The bottom flo,:tt activates the lower alarm and
the middle flclat opens the lower alarm circuit allowing the
upper float t:o activate the high stage alarm as the water
continues to rise.
When the 10wElr and upper floa'ts are activated, they close
the battery circuit, triggering t,he alarm, which dials sev-
eral phone numbers and plays prerecorded flood warning mes-
sages. A staff gage is mounted near the stilling well to
provide a visual reference of s'tream stage during floods.
Additional staff gages may .b,~ placed near the gage to allow
higher stages t:o be evaluated.
4.2.3 Alarm Messages
The tape dialer alarm can be programmed to call certain
numbers and provide messages.. 'rhs following is an example of
a typical seriHs of messages from t.he downstream alarm gage:
4.2.3.1 Lower Alarm
"This is the Wiggins Flood Warning System, downstream warn-
ing gage. Water has reach,~d the lower float.. Note the
time."
4.2.3.2 Upper Alarm
"This is the Wiggins Flood 1iVarning System, downstream warn-
ing gage. Water has reach,~d the upper float. Note the
time."
4.2.3.3 Use oj: Warning Messa'3'es
Using the tines noted when 'the alarm messages are received,
the flood coordinator can deb~rmine the elapsed 1:ime between
alarms and Table 3 to get an idea of how severe the flood is.
Using Tables 5 and 6, the coordinator can estima1:e the length
of time until t:he flood may arrive.
4.2.4 Communications
4.2.4.1 Suggest:ed Flood Communications
During a flood, there will be a need to make and receive
calls. For t:hat reason, an Emergency Operations Center
(E.O.C.) should be designated. The City Hall would be a good
E.O.C. location if either 2 phone lines, or at a minimum, the
call interrupt option were added 1'.0 the existing phone. That
way, calls could be placed to observers, the National Weather
service, etc. ,. without missing an addi'tional phone message
from a flood warning gage.
Once the first alarm is received, someone should go to the

11