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Issues Affecting the Plan

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Issues Affecting the Plan ISSUES AFFECTING THE PLAN LOS ANGELES RIVER REVITalIZATION M3ASTER PlaN The Los Angeles River, through Studio City near Laurel Canyon Boulevard (2006) LOS ANGELES RIVER REVITALIZATION MASTER PLAN ISSUES AFFECTING THE PLAN The 32-mile planning area represents a variety of conditions that have shaped the Plan. This River Channel Reaches chapter discusses variations in channel geometry, flood capacity, hydraulic conditions, water quality, habitat value, non-motorized transportation s and recreation potential that have influenced recommendations. The larger planning context is also important, both from the perspective of the watershed and how to accomplish goals while considering a wide variety of complex issues. River Channel Reaches Base Info Legend 1: Confluence to Sepulveda Basin Existing Open Space 2: Sepulveda Basin Limit of Geographical Data Set 3: Sepulveda Basin to Tujunga Wash Metro Gold Line 4: Tujunga Wash to Barham Blvd. Metro Gold Line Eastside Extension Channel Reaches 5: Barham Blvd. to Burbank Western Channel Metro Red Line 6: Burbank Western Channel to Taylor Yard Metro Orange Line 7: Taylor Yard Metro Blue Line Reach 1: Arroyo Calabasas-Bell Creek Confluence to Sepulveda Basin (2006) 8: Taylor Yard to 1st Street Station Symbol 9: 1st Street to Washington Blvd. Reach 2: Sepulveda Basin (2006) Reach 3: Sepulveda Basin to confluence with Tujunga Wash Reach 4: Tujunga Wash to Barham Boulevard (2006) Reach 5: Barham Boulevard to Burbank Western Channel (2006) (2006) 3 ISSUES AFFECTING THE PLAN LOS ANGELES RIVER REVITALIZATION MaSTER PLAN PHysIcal CHaractERIstIcs OF THE RIVER CHANNEL The Plan includes proposed enhancements to the existing River channel, from its Reach 5: Barham Boulevard to Burbank Western Channel origination at the confluence of Bell Creek and Arroyo Calabasas, to Washington From Barham Boulevard to the confluence of the Los Angeles River with the Burbank Boulevard just south of downtown Los Angeles. There are nine distinct channel reaches Western Channel, the River is a concrete-lined rectangular channel approximately 130 that vary in geometry and width: feet wide. Flow velocities in this reach also exceed 30 feet per second, during storm events. Riverside Drive parallels the River on the south side, while the north bank Reach 1: Arroyo Calabasas-Bell Creek Confluence to Sepulveda Basin borders the City of Burbank. Reach 6: Burbank Western Channel to Taylor Yard (2006) Through this largely-residential segment, the River is a concrete-lined trapezoidal channel, approximately 20 feet deep and with a bottom width of 45 to 115 feet wide. Reach 6: Burbank Western Channel to Taylor Yard High water velocities in this reach can range from 20 to 29 feet per second, during storm From the Burbank Western Channel to Taylor Yard, the River again takes on a naturalized events. character, with a soft bottom. The River is very wide through this area, with flow velocities ranging from 15 to 19 feet per second, during storm events. Willows and other riparian Reach 2: Sepulveda Basin plant species have become well established. Sepulveda Basin is one of two segments where the River has a soft bottom and displays a more naturalized character. The River is approximately 60 feet wide and is surrounded Reach 7: Taylor Yard Reach 7: Taylor Yard (2006) by park area and open space. Water flows in this reach can reach approximately 15 feet At Taylor Yard, the River has a soft bottom, and water flows are in the range of 15 to 20 per second, during storm events. feet per second, during storm events, making this area a prime candidate for significant ecosystem restoration. Reach 3: Sepulveda Dam to Confluence with Tujunga Wash Downstream of Sepulveda Dam, the River is constrained within a rectangular channel Reach 8: Taylor Yard to 1st Street ranging in width from 45 to 60 feet. Surrounding land uses are primarily residential. The area from Taylor Yard downstream to 1st Street, with flow velocities greater than Valley Heart Drive parallels the River continuously beside most of this reach. Peak water 30 feet per second, during storm events, is one of the most complex sections from a flow velocities in this reach range from 20 to 25 feet per second, during storm events. hydraulic standpoint. The channel geometry changes several times within a very short Reach 8: Taylor Yard to 1st Street (2006) Reach 4: Tujunga Wash to Barham Boulevard segment, and this affects the range of improvements that can be accomplished. The River is a concrete-lined rectangular channel, approximately 15 feet deep and with Reach 9: 1st Street to Washington Boulevard (Downtown) a bottom width that ranges from 60 to 160 feet. The channel right-of-way is very limited, In this final reach, the River is constrained by rail lines and freeways. The River channel extending only two to four feet outward from the top of the bank. Peak flow velocities is at its widest, ranging between 100 and 160 feet, has flow velocities of greater than 30 range from 30 to 34 feet per second, during storm events; because of these speeds, this feet per second during storm events, and continues as a concrete-lined trapezoid. It is is one of the most challenging sections from the standpoint of restoration. highly visible from many historic bridges and overpasses, however, and this makes it a prime location for enhancement. Reach 9: 1st Street to Washington Boulevard (Downtown) (2006) 3 LOS ANGELES RIVER REVITALIZATION MASTER PLAN ISSUES AFFECTING THE PLAN Flow Velocities within the Channel s Flow Velocities Existing Flow less than 15 ft./Second Existing Flow between 15 - 19 ft./Second Existing Flow greater than 19 ft./Second Base Info Legend Existing Open Space Limit of Geographical Data Set Metro Gold Line Metro Gold Line Eastside Extension Metro Red Line Metro Orange Line Metro Blue Line Station Symbol Flow velocities in the channel range from 20 to 30 feet per second in many locations, limiting the ability to reestablish a riparian corridor within the River. 3 ISSUES AFFECTING THE PLAN LOS ANGELES RIVER REVITALIZATION MaSTER PLAN HydraULIC CONSIDEratIONS: CHANNEL CapacIty AND VELOCIty THE NEED TO MAINtaIN EXIstING FLOOD capacIty THE NEED TO slOW FLOW VELOCITIES Two hydraulic considerations influence modifications to the River. The first and most A second consideration is the relative speed or velocity of water flows in the River. Within important is the need to maintain existing flood capacity. the River’s soft-bottomed sections, flow velocities allow the existing vegetation to grow. At higher speeds, vegetation is difficult to sustain because flood flows wash it out. The Adding vegetation to create habitat, or providing terraced access to the water, are issue is not simply one of maintenance -- having to replace plantings on a routine basis actions that would reduce flood capacity unless the current channel is widened or -- it also concerns the structural integrity of the channel itself, since flood flows can also deepened to compensate, or unless new underground box culverts are installed to wash out portions of the concrete or other armoring systems. transport flood flows outside of the existing River channel. As shown in the graphic on the facing page, most of the concrete-lined segments of the Different types of vegetation have different impacts on flood capacity. Grasses, for River have flow velocities that can range from 20 to 30 feet per second. Slowing these example, have less impact than woody plants, such as willows, because flood flows are high velocities to less than 12 feet per second will be critical to reestablishing a riparian more likely to pass over them, rather than be impeded by them. Less additional capacity corridor within the River, and to providing additional greenway improvements. This is therefore necessary when introducing grasses as opposed to woody plants. would require one or a combination of the following measures: 1) storage of flood flows in basins outside the main channel; 2) provision of additional underground box culverts Finally, the amount of vegetation introduced also has an effect on flood capacity. As to transport flows; or 3) land acquisition allowing channel widening. Opportunities shown below, restoring the River to a “30-percent green” standard requires less exists throughout the River corridor to implement these, or a combination of measures to additional capacity than if a “70-percent green” standard were applied. Because of the help naturalize the River and encourage stable habitat establishment. increased channel capacity that is required due to a higher percentage of vegetation Existing River Right-of-way Width Varies Depending on Reach within the channel, additional strategies will likely be necessary in combination with channel widening whenever possible. These can include off-channel storage for volume reduction, implementation of on-site stormwater control measures, and expansion of capacity through deepening the channel and through construction of additional underground box culverts. Expansion in channel capacity needed to make the River’s surface area 30-percent green. Existing Channel Cross-section Expansion in channel capacity needed to make the River’s surface area 70-percent green. The approximately “5 times the current width” illustration is meant to illustrate the width that could be necessary if only the channel were widened 3 LOS ANGELES RIVER REVITALIZATION MASTER PLAN ISSUES AFFECTING THE PLAN Storm Drain Outfalls s Existing Storm Drain Outfalls existing Storm Drain outfalls 30-60” in Diameter Base Info Legend Existing Open Space Limit of Geographical Data Set Metro Gold Line Metro Gold Line Eastside Extension Metro Red Line Metro Orange Line Metro Blue Line Station Symbol 3 ISSUES AFFECTING THE PLAN LOS ANGELES RIVER REVITALIZATION MaSTER PLAN WatER QUalIty CUrrENT watER QUalIty IN THE LOS ANGELES RIVER With the increasing urbanization of Los Angeles, the quality of the water in the River has Just how bad is the River’s water quality? TMDL’s have been established for WHat arE “TOtal MaXIMUM declined significantly.
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