caldwell county regional water and wastewater planning study

espectively from the information provided in the survey. Table 9-1 provides thesurvey data used to determine wastewater flows. The average daily wastewaterflow for the county was 85 gpcd. The peak day wastewater flow factors for Lulingand Lockhart, as shown in Table 9-2, were 3.75 and 1.25 respectively.TABLE 9-1Wastewater ConnectionsSystemTotal WaterConnectionsTotal SewerConnectionsPercent ofSewerConnectionsPopulationSewerPopulationAverageDailyWastewaterFlow (MGD)AverageDailyWastewaterFlow PerCapita (gpd)Lockhart 4,095 4,085 0.998 13,600 13,464 1.2 89Luling 2,152 2,122 0.986 5,080 4,978 0.4 80Average 0.8 85TABLE 9-2Wastewater Peak Day Flow FactorsSystemPeak Day Flow FactorLockhart 1.25Luling 3.75As seen from Table 9-2, the water to wastewater return rates varied from 56% to79%. The lower return rate can indicate greater outdoor water use or loss and thehigher return rates can imply water inflow and infiltration. Normally, averagereturn rates vary from about 60% - 80%. The return rate determined from thesurvey information provided was an average of 68%. The return rate was used toestimate return flows from the projected water demands.TABLE 9-3Wastewater Return RateSystemWastewaterper capitaWater percapitaReturn RateLockhart 89 113 79%Luling 80 143 56%Average 68%Klotz Associates Project No. 0972.000.000January 20109-2Caldwell County Regional Water and Wastewater Planning StudyFinal Report