Water Quality Master PlanningWater Quality Master Planning

A Barton Creek Model

Katherine G. OsborneCE 394K.2 Surface Water Hydrology

Topics of DiscussionTopics of Discussion• Background

• What are we modeling?

• How are we doing it?

• What are the outputs?

• Conclusions

BackgroundBackgroundWhy does Austin care?A Brief History

• Christine’s Model• Phase II

What are we modeling?What are we modeling?Flows

Loads

Best Management Practices removals

How are we doing it?How are we doing it?

• Flows• Loads• BMP removals

Impervious Cover Related to land use

Flows - InputsFlows - Inputs

Flow Direction Based on CRWR Pre-Pro of 30 m DEMs

Correction Grid Not usedRecharge Flow From Recharge script which

requires:Cell Recharge Recharge zone grid,

Creek grid, Flow accumulation, Flow direction, Watershed, and Upstream points.

Flows - EquationsFlows - EquationsRv = 0.3428IC 2+ 0.5677IC + 0.0125

Rv bf = - 0.36IC + 0.1904

In recharge zone, Flow = Raw Flow - Recharge

Flows - OutputsFlows - OutputsCorrected direct runoff generated in each cellCorrected base flow generated in each cell

Total flow without considering recharge

Total predicted flow

Direct runoff

Base flow

Loads - InputsLoads - InputsDirect runoff EMC tableBase flow EMC table

Impervious cover coverage or gridFlow direction gridWater land use zones gridDirect runoff Base flow generated Total flow without considering recharge Cell recharge

Loads - EquationsLoads - Equations• Equations

EMC = a+bICEMC bf = C if IC< undeveloped (15%)

D if IC> undeveloed

Loads - OutputsLoads - OutputsLoad grids for constituents for which the

load is computed. TSSTSS BOD COD TOC DP TP NH3 TKN NO TN Cu Pb Zn

Best Management Practices Best Management Practices Located BMPs defined by mass removed

Located BMPs defined by efficiency

Non-located BMPs defined by efficiency Inputs

Flow direction grid Flow accumulation gridBMPs point coverage - The attribute table must contain a load removed field. Initial load grid - the result of the load computation.

OutputRemoved Load grid

ConclusionsConclusionsNice Tool

Needs to include: Future land useChannel Erosion

Questions?Questions?