FLOOD06380

• County: Statewide
• Community: Adams/Arapahoe/Denver/Broomfield/Douglas/Jeffco
• Basin: Statewide
• Title: Urban Storm Drainage, Criteria Manual Volume 2
• Date: 6/1/2001
• Prepared By: Wright Water Engineers, Inc.
• Floodplain - Doc Type: Educational/Technical/Reference Information

HYDRAULIC STRUCTURES

DRAINAGE CRITERIA MANUAL (V. 2)

HS-4 This grade control structure on the South Platte River was a hazard to
the boating public until it was retrofitted by the COOT......................................... .....................HS-7

e

HS-5 Example of stepped downstream face for a sloping bouider drop structure...... ..................... HS-20

HS-6 Detail of the grouted sloping boulder drop with a trickle channe section
creating the sight and sound of cascading water.......................................... .......................... HS-21

HS-7 An overall view of the drop structure from the previous page is illustrated
here to emphasize the opportunities available for creating an attractive
urban hydraulic setting for the riparian corridor .......................................................................HS-22

HS-8 A vertical hard basin drop structure can be an effective tool for controlling
grade, but it is not as desirable as a grouted sloping boulder drop because
of safety concerns and aesthetics............................................................................................ HS-26

HS-9 Close-up of the inside workings of a baffle chute drop after more than
three decades of service .......................................................................................................... HS-30

HS-10 Boatable channels of the District waterways provide enjoyment to a wide
variety of citizens.... ......................... ............... ..... ................................................. .................... HS-37

HS-11 Urban grass channels can experience bank erosion and degradation when
established design criteria are not used .................................................................................. HS-39

HS-12 Upstream and downstream views of a low tailwater basin in Douglas County
protecting downstream wetland area ....................................................................................... HS-67

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HS-13 Culvert outlets are often left unprotected causing downstream degradation........................... HS-70

HS-14 A stable channel at bridges is important and includes caring for the stream
downstream of the bridge as shown here on Cherry Creek .................................................... HS-80

HS-15 A failed rundown that relied upon a geotextile membrane for stability.................................... HS-99

HS-16 The unsightly and hazardous 8-foot-high Brown Ditch weir was replaced with
three low-head drop structures having a 10:1 downstream slope and a boat
chute...................................".................,...,.............................................,................ .............. HS-1 04

HS-17 Grouted sloping boulder drops can be built in series to create pleasing amenities
and to provide stable and long-lived grade control structures ...............................................HS-105

HS-18 Warning signs can be used to help achieve public boating safety. but signs
cannot in themselves serve as a substitute for an appropriate standard of
care in the design of a reasonable grade control structures on a boatable
waterway................... .................... .................... ............................... .......... ................... ......... HS-1 07

e

HS-vi

06/2001
Urban Drainage & Flood Control District