Welcome to the Coachella Valley Water D

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Welcome to theCoachella Valley Water D
CVWD provides domestic water, wastewater,
recycled water, irrigation/drainage, regional
stormwater protection and groundwater management
services to a population of 265,000 throughout
the Coachella Valley in Southern California.
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Coachella Valley
CVWD boundaries encompass an area of nearly 1,000
square miles. Most of this land is in Riverside
County, but CVWD also extends into Imperial and
San Diego Counties.
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In 1915, the Coachella Valley Stormwater District
was organized and later in 1918, under the state
water code provisions of County Water District
Act (Water Code d 30000 et seq.), the Coachella
Valley Water District was formed. A governing
board of five members is elected from five
general divisions for terms of four years each.
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Coachella Valley
Eastern Valley
Thousand Palms
Palm Springs
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History of Flooding

• September 1939 (Indio)
• January 1969 (So. Cal., Mission Creek)
• October 1974 (Long / Wide Canyon)
• September 1976 (Kathleen, Coves)
• September 1977 (Doreen, 1000 Palms)
• March 1978 (Mission Ck Flood of Record)
• July 1979 (Dolores, Rancho Mirage)
• August 1983 (Ishmael, Desert Hot Springs)

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General Types of Storms

• Winter Storms originate over the Pacific Ocean
• Summer Storms moist tropical air originating
  over the Gulf of Mexico, Sea of Cortez, tropical
  Pacific Ocean. Occasionally remnants of a
  tropical hurricane.
• Local Thunderstorms can occur anytime of the
  year

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Hurricane Kathleen Palm Desert 1976 lt30 M in
protection since
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Palm Desert Area (1976)
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Palm Desert Area (1976)
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Palm Desert Area (1976)
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Palm Desert Area (1976)
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Rancho Mirage 1979
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Rancho Mirage 1979
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Debris Flow
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Locations of Flood Control Projects
Magnesia Canyon Project
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Locations of Flood Control Projects
Magnesia Canyon Project
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Magnesia Canyon Project Rancho Mirage
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Locations of Flood Control Projects
Magnesia Canyon Project
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Bear Creek Alluvial Fan City of La Quinta

• Project 1986
• Design Data
• Drainage Area 10 mi2
• Q100 6,820 ft3/s
• QSPF 10,000 ft3/s

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La Quinta (Bear Creek) Project
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Bear Creek Fan Debris Basin
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Bear Creek Debris Basin Channel
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Bear Creek Channel Oleander Reservoir
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Locations of Flood Control Projects
Magnesia Canyon Project
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Deep Canyon Project

• Design Data
• Drainage area 40 mi2
• Q100 13,000 ft3/s

Golf Course Channel
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View of Deep Canyon Alluvial Fan
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The Reserve (Deep Canyon) Project Overview
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The Reserve (Deep Canyon) Project
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Deep Canyon (Alluvial Fan) Flood Control December
28, 2004, Small Storm 450 cfs 30,000 cfs Design
Capacity
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Locations of Flood Control Projects
Magnesia Canyon Project
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Palm Valley (Dead Indian Canyon) Project
Design Data Project 1984
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Dead Indian Debris Basin
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Dead Indian Wash Debris Fields
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Dead Indian Debris Basin and Spillway
Dead Indian DA 15 mi2 Cat Creek DA 4.1 mi2 QSPF
16,400 ft3/s - Upper Reach QSPF 28,000 ft3/s
- Lower Reach
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Cat Creek Spillway Channel Confluence
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Flood Channel Outlet near Whitewater River
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Locations of Flood Control Projects
Magnesia Canyon Project
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Sun City Developer Built Flood Control Project

• Design Data
• Thousand Palms Canyon drainage area 80 mi2
• Q100 23,000 cfs

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Sun City (Thousand Palms Canyon) Project (2000)
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Proposed Sites for Development
Sun City
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Proposed Site for Development
Planned Development
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Proposed Site for Development
Planned Development
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Planning Areas

• Eastern Coachella Valley population forecasts
  predict significant conversion from agricultural
  to urban uses
• Thousand Palms ACOE Flood Control Project

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Eastern Coachella Valley
Predicted to have the fastest growing population
rate in United States in the next thirty years
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Eastern Coachella Valley Stormwater Master Plan
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Eastern Coachella Valley Stormwater Master Plan
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Thousand PalmsExisting Conditions

• In an alluvial floodplain
• Subject to flash flooding from Indio Hills and
  San Bernardino Mountains
• Sometimes with little or no warning
• Some developer-built flood control
• No Regional Flood Control

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Flood Rate Insurance Maps (FIRM)
Thousand Palms
Interstate 10
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Levee
Levee
Levee
Channel
Golf Course
Channel
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Location from Where video was shot
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Via Las Palmas
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Thousand Palms February 2005 Less than 10-yr event
Tri Palm Estates February 2005
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• Thank You