Waller Creek Tunnel LA-Qual (v 9.05) Dissolved Oxygen Model for Recirculation Operations

This short report details the function and expected results of a Waller Creek tunnel designed to move sediment and regulate dissolved oxygen within the system.The City of Austin is constructing a stormwater bypass tunnel in lower Waller Creek. Water must be recirculated from Lady Bird Lake through the tunnel during non-storm conditions to prevent water in the tunnel from becoming anoxic. LA-Qual (version 9.05) steady-state models were used to identify optimum tunnel recirculation flow rates under three seasonal conditions and during summer months immediately following storm events in order to maintain dissolved oxygen in the tunnel near 4 mg/L. Model predictions were applied to measured Waller Creek flow data from 1994 to 2009 to estimate the total recirculation withdrawal from Lady Bird Lake for comparison to the maximum allowed under a Firm Water Contract with the Lower Colorado River Authority. Predicted Lady Bird Lake withdrawal for recirculation varies from 1 to 4 ft3 /s during non-storm conditions depending on season, with 4th Street and 8th Street side inlet tunnel flows less than 0.5 ft3 /s. Post-storm recirculation rates are predicted to optimally be 35 ft3 /s, although the actual maximum pump capacity is 28 ft3 /s. Operating the Waller Creek immediately following storm events at 28 ft3/s will not maintain DO in the tunnel above 4 mg/L, but should be sufficient with cascade aeration prior to discharge to Waller Creek to maintain aquatic life use standards. Operation of the Waller Creek Tunnel under these recirculation flow conditions are not anticipated to exceed the annual maximum withdrawal from Lady Bird Lake allowed by the Lower Colorado River Authority.Waller Creek Working Grou

Draft Final Report

This report contains reviews of various city ordinances, which include plans to improve design regulations along the overlay zone. Also includes a mention of the Waller Creek Citizens' Advisory Committee.EXECUTIVE SUMMARY: The Colorado River corridor from Tom Miller Dam, through Lady Bird Lake and then eastward beyond Longhorn Dam is undoubtedly the most significant community asset in central Austin. This incredibly beautiful stretch of river provides a wide range of benefits to our city including fantastic scenic vistas, wonderful urban recreational opportunities, and serene open spaces that gives our center city a unique character among Texas cities. In addition to providing our drinking water, the river and lake are a major economic asset drawing folks to Austin both to work and play downtown. It is also a fragile beauty that can quickly be overwhelmed if development along its shores is not carefully planned and regulated to provide a balance between accommodating growth in the urban core and preserving the character of the river corridor and the lakefront. Development along the banks of the lake in the 1970’s and early 1980’s drew attention to the need to establish a clear vision of what the community wanted along the lakefront. The 1985 Town Lake Corridor Study and the 1986 Waterfront Overlay ordinance gave the task force the necessary planning guidelines and land development tools to assess what would constitute harmonious development along the lakefront preserving the unique quality of this river corridor. While the original Waterfront Overlay ordinance was largely successful, recent development pressure along the shoreline of Lady Bird Lake has brought into question whether the current Waterfront Overlay ordinance is adequate to protect and enhance the lakefront, especially since the 1986 ordinance underwent a code rewrite in 1999 that made some significant changes. In response to this concern, the City Council charged the Waterfront Overlay Taskforce with reviewing the current situation. The essential finding from the Taskforce’s eight month review is that the current code has been significantly weakened by the changes in the ordinance that have been adopted since 1986 and in particular the 1999 recodification of the ordinance has removed significant protections and incentives to promote community benefits and enhancement of the waterfrontWaller Creek Working Grou

Complete Solution of the Lady in the Lake Scenario

In the Lady in the Lake scenario, a mobile agent, L, is pitted against an agent, M, who is constrained to move along the perimeter of a circle. L is assumed to begin inside the circle and wishes to escape to the perimeter with some finite angular separation from M at the perimeter. This scenario has, in the past, been formulated as a zero-sum differential game wherein L seeks to maximize terminal separation and M seeks to minimize it. Its solution is well-known. However, there is a large portion of the state space for which the canonical solution does not yield a unique equilibrium strategy. This paper provides such a unique strategy by solving an auxiliary zero-sum differential game. In the auxiliary differential game, L seeks to reach a point opposite of M at a radius for which their maximum angular speeds are equal (i.e., the antipodal point). L wishes to minimize the time to reach this point while M wishes to maximize it. The solution of the auxiliary differential game is comprised of a Focal Line, a Universal Line, and their tributaries. The Focal Line tributaries\u27 equilibrium strategy for L is semi-analytic, while the Universal Line tributaries\u27 equilibrium strategy is obtained in closed form

Complete Solution of the Lady in the Lake Scenario

In the Lady in the Lake scenario, a mobile agent, L, is pitted against an agent, M, who is constrained to move along the perimeter of a circle. L is assumed to begin inside the circle and wishes to escape to the perimeter with some finite angular separation from M at the perimeter. This scenario has, in the past, been formulated as a zero-sum differential game wherein L seeks to maximize terminal separation and M seeks to minimize it. Its solution is well-known. However, there is a large portion of the state space for which the canonical solution does not yield a unique equilibrium strategy. This paper provides such a unique strategy by solving an auxiliary zero-sum differential game. In the auxiliary differential game, L seeks to reach a point opposite of M at a radius for which their maximum angular speeds are equal (i.e., the antipodal point). L wishes to minimize the time to reach this point while M wishes to maximize it. The solution of the auxiliary differential game is comprised of a Focal Line, a Universal Line, and their tributaries. The Focal Line tributaries' equilibrium strategy for L is semi-analytic, while the Universal Line tributaries' equilibrium strategy is obtained in closed form.Comment: 20 pages, 4 figure

Density and Survival of Lady Beetles (Coccinellidae) in Overwintering Sites in Manitoba

The densities of lady beetles, Coccinellidae, overwintering as adults (adults per m2) in leaf litter collected in late October for two years in a beach-ridge forest on the south shore of Lake Manitoba were 56.4 for the Thirteen-spotted Lady Beetle, Hippodamia tredecimpunctata (Say), 38.3 for the Seven-spotted Lady Beetle, Coccinella septempunctata (L.), 7.7 for the Transverse Lady Beetle, Coccinella transversoguttata richardsonii Brown, 1.6 for the Convergent Lady Beetle, Hippodamia convergens Guerin, and 0.6 for the Parenthesis Lady Beetle, Hippodamia parenthesis (Say). The mean overwintering survival for these species was 0.254, 0.036, 0.023, 0.0, and 0.0, respectively. The density of overwintering coccinellids was highest near the margins of the forest, particularly on the beach side, where beetles from shore appear to have entered the forest. The mean density over 3 years (2.9 per m2) of all coccinellid species in November in the litter under a remnant grove of riverbank forest in Winnipeg, was lower than in the beach-ridge forest (104.8 per m2), but their survival (0.460) was higher than in the beach-ridge forest (0.154). More species of coccinellids were found in the samples from the riverbank forest than from the beach-ridge forest

\u3ci\u3eMerlin\u27s Winter\u3c/i\u3e / \u3ci\u3eEurydice In The Real World\u3c/i\u3e / \u3ci\u3eWalking On Water\u3c/i\u3e

Merlin\u27s Winter: Your season is over now. The Lady of the Lake has closed her villas for the winter Eurydice In The Real World: Orpheus crept unseen into his afterlife through the early dark Walking On Water: Sunset bleeds across the sky, stains my fingers saffron and peaches

The Identity of the Mysterious Portuguese Lady

UIDB/04097/2020 UIDP/04097/2020During the Shelley-Byron circle’s intertextual summer of 1816 in Geneva, Lord Byron’s physician, John William Polidori, kept a journal in which he described the group’s activities. Polidori’s autobiographical narrative as well as Claire Clairmont, Byron and Percy Shelley all mention a close friend of the doctor’s in Geneva, a Portuguese lady who has remained a mysterious presence until now. Based on research using Portuguese and Swiss sources, this article establishes that the Portuguese lady was Henriette Brélaz (née Lassence), the wife of Pierre Nicolas Brélaz, a Swiss trader born in Lisbon who lived in Genthod across the lake from Villa Diodati.publishersversionpublishe

Otterbein Aegis January 1898

Contents: Editorial Etchings; Latin in Otterbein; Critique-The Lady of the Lake; Heredity; Mathematics in Otterbein; A Vacation Experience; The Concert Company; A Defense of the Dead Languages; Alumnal Notes; Locals, etc.https://digitalcommons.otterbein.edu/aegis/1069/thumbnail.jp

Lady Pirates Third At PBC Women\u27s Golf Championships

Lady Pirates Third At PBC Women\u27s Golf Championships. The Armstrong Atlantic State women\u27s golf team fired a first-round 337 to sit in third place, just five strokes off the lead, after Monday\u27s action in the 2010 Peach Belt Conference Women\u27s Golf Championships at the Lake View course of Callaway Gardens