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CE 394K: GIS in Water Resources Small Dam in Village of Tlamacazapa, Mexico Robin Lynch CE 394K: GIS in Water Resources Small Dam in Village of Tlamacazapa, Mexico Robin Lynch

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Tlamacazapa, Guerrero Remote mountain village Wells contaminated with: Arsenic, Lead, and Fecal Runoff Severe 6 month dry season Limited piped water (~2 hours/week)

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Wet Season Agua de Shrek

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Dry Season (Same well)

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Goal of Project Create a dam to meet water needs Delineate stream network Determine best location for dam Delineate watershed Size the dam using Sequent Peak Method

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Stream Delineation Drains from village runoff, too polluted Too far from road, difficult to maintain Perfect!

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Watershed delineation Drainage Area = 7689600 m 2 Dam

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Average Rainfall (2003-2007)

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Flow Calculation Runoff ratio, w = 0.2 Drainage Area, DA = 7689600 m 2 Q = P*DA*w Calculated per month

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Water Demand Calculate volume for 3 scenarios Assume population of 6000 people Water Use Per Day: Current15L/c/day Minimum40L/c/day Optimum100L/c/day Monthly Volume Current2700m 3 /month Minimum7200m 3 /month Optimum18000m 3 /month ~2.5 flushes ~7 flushes ~17 flushes

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Dam Location

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Dam Sizing

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Sequent Peak Method (m 3 /month) tRteLtQtKt-1Kt mm/mo May180006071.63157128840.800 June180006071.6315734201500 July180006071.63157282202.200 August180006071.63157325743.800 September180006071.63157290137.800 October180006071.63157135146.300 November1800093111.028930020.200 December1800093111.02890018111.03 January1800093556.4386799.718418111.0335867.75 February1800093879.08112610.9435867.7542135.89 March1800093966.006413121.5342135.8947980.36 April18000931034.37912278.7547980.3654735.99 Water DemandEvaporation Losses Inflow Minimum Capacity (m 3 )

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Dam Sizing m 3 /monthKt (m 3 )Height (m) Current270048993.5 Minimum7200140165.5 Optimum180005473610.5

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Next Steps/Pitfalls Geological survey Community Participation Clear organizational structure Affordable pricing

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Questions?