Page 5 - Yucaipa Valley Water District
P. 5
Workshop Memorandum 17-151
Date: October 10, 2017
From: Matthew Porras, Management Analyst
Subject: Status Report on the Slope Repair at Drinking Water Reservoir R-15.1
District crews have been working to clean up the soil material that washed down the east facing
slope at the drinking water reservoir R-15.1 located on Fir Avenue, East of Fremont Street in
Yucaipa.
The slope damage that occurred in this area is the result of a clogged drain that was filled with
sediment from the sheet flow run-off from the adjacent parcel. The slope was originally
engineered to control run-off with two concrete lined swales and a storm drain system that
conveys the collected rain water away from the slopes to prevent erosion. When the upper swale
and drain filled with sediment, the run-off eroded the slope as the water traveled down to the
pavement below, displacing a large amount of soil material. District staff observed the issue
during a rain event on January 23, 2017. The cleanup effort has consisted of District staff
removing the soil material on the pavement and in the drains.
In addition to the repair of the slope, the District is considering implementing additional
preventative solutions. The improved design will include 125 linear-feet of gabions installed near
the eastern property line where the natural drainage occurs. The gabions will slow the run-off
and collect the sediment before clogging the drains and swales.
Yucaipa Valley Water District - October 10, 2017 - Page 5 of 272
