Las Delicias Water Project: Piping System Design EWB-MAP Compiled by: Richard Cairncross Date 1/12/2012 Updated: 2/12/2012

Map of Current Water System (section relevant for EWB-MAP modifications) RED lines – supply lines to tank (uphill by pump) BLUE lines – distributions lines by gravity DOWNHILL

Proposed update to Water System (section relevant for EWB-MAP modifications) RED lines – supply lines to tank (uphill by pump) BLUE lines – distributions lines by gravity NEW SUPPLY LINE 1 NEW DISTRIBUTION LINE 2c NEW DISTRIBUTION LINE 2a NEW DISTRIBUTION LINE 2b NEW TANK A B C D E F DOWNHILL

Piping System Layout New Pipelines Supply Line 1 to new tank (A-B-C) – Length = 365 m + tank connection (assume + 10 m) = 375 m – 1 bend, 1 tee, 3 elbow, 2 valves, 1 exit – 17 m elevation rise + tank height – Hill rises to 643 m then valley falls t0 640 m on connecting road (D-B) – ~175 gpm flowrate Distribution line connection 2a from lower Tramo 3b to lower Tramo 6 (E-F) – 105 m length, elevation change unclear, guess 10 m drop Distribution connection 2b from upper Tramo 3b to upper Tramo 6 (B-D) – 120 m length, 8 meter drop with low point at 640 m (3 m below D) Distribution line 2c from new tank to new connections (C-B-E) – 255 m length, 11 meter elevation drop Waypoints PointLocationElevation ACalle Principal638 m BIntersection at Field 651 m CNew tank655 m DEnd of upper Tramo m EEnd of lower Tramo 3b 640 m FEnd of lower Tramo 6 ?? Guess 630 m

Proposed update to Water System (section relevant for EWB-MAP modifications) RED lines – supply lines to tank (uphill by pump) BLUE lines – distributions lines by gravity NEW SUPPLY LINE 1 NEW TANK A B C 105 m 20 m 240 m DOWNHILL

Estimate of head losses in supply pipe 1 (smooth PVC) 4” PVC sufficient to keep major and minor losses to >10% of the elevation change

Assumptions for Supply Pipe 1 Calculation

A B C 105 m 240 m D 638 m 640 m 643 m 651 m Elevation: 640 m 655 m Supply Pipe 1 Pipe Profile NEW TANK Tee connect to 6” pipe Gate Valve 45° Elbow 90° Elbow with anchor Gate Valve 90° Elbow Pipe Exit PIPE FITTINGS Tee with Manual Air release valve Tee with Manual drain valve Road Crossing

Supply Pipe 1 Trenching Based on recommendations from EWB Water Resource Guidelines and advice from Tony Sauder: – 70 cm trench depth with pipe buried below 50 cm – 10 cm bedding (2-12 mm soil) if stones/rocks present in trench – Back-fill with soil that is free of lumps, from stones (>3 cm), and from organic matter – PVC pipe joined in trench and cure for >10 hr prior to pressurizing. Keep joints exposed to check for leaks – For road crossing, bury PVC pipe inside steel or concrete pipe (ID > diameter of PVC joints) and bury at same depth as standard trench 70 cm trench depth 10 cm bedding 10 cm 50 cm

Valve Boxes Design options – Obtain pre-cast valve boxes with lockable lids locally – Build from bricks and mortar with metal lids Specifications – 4” Pipe centered about 55 cm below ground level – Box should extend 10 cm above ground level – Internal dimensions roughly 45cmx45cm – Place support under valve Photos of current valve boxes installed in Las Delicias

Design of Valve Boxes from a prior EWB project Adjust Dimensions based on local conditions For Single 4” pipe

Thrust Anchors for Elbows &Tees From Russ Turner, Tetratech

Thrust Anchor Dimensions Based on 4” PVC PIPE 50 cm Trench Depth Height of Anchor 25 cm Length of Anchor Backing against undisturbed material: 90° BEND: L = 80 cm 45° BEND: L = 40 cm Tee: L = 40 cm

Additional Fittings for Supply Pipe 1 At high point of supply pipe 1 at point D – Install tee with small diameter ball valve to release air trapped in line – Instruct water system operator to open air release valve briefly at least once every three months while pump is operating At low point of supply pipe 1 between points D and B – Install tee with small diameter ball valve and pipe to drain water and remove sediments from pipe – Instruct water system operator to open drain valve briefly (5 minutes) at least once every three months while pump is operating to eject water and clear sediments

Supply Pipe 1 Materials List 4” PVC pipe (Schedule 40) in 6 m lengths – 62 pieces 4” PVC 45° Elbow – 1 piece 4” PVC 90° Elbow – 1 piece Tee connector & Adapter from 6” PVC main to 4” branch line – 1 piece PVC primer, PVC cement, applicators, and cleanup Gate/Ball valves (PVC or steel ?) – 2 pieces Bed material for trench (2-12 mm), if necessary Fill material, if necessary Concrete for Anchoring Piping at Bends Brick for Valve boxes Mortar for valve boxes Lids for valve boxes Tools for cutting, de-burring, connecting pipe, mixing concrete Tools for digging trench

EPA-NET Simulation for Supply Line 1 Matches Excel Calculations DOWNHILL

Design of Distribution lines 2a, 2b, 2c See following map of community and assessment of change in number of homes served by tanks in current and proposed water system During implementation trip, the EWB team will connect Tramo 6 to the New Tank (points D-B-C) with 2” PVC pipe in same trench as new supply pipe and gather data about flowrates supplied to homes from new tank The EWB team plans to use EPANet software to model distribution to households and assess needs for altered pipe sizes after gathering flowrate data supplied by new tank

Proposed update to Water System (section relevant for EWB-MAP modifications) RED lines – supply lines to tank (uphill by pump) BLUE lines – distributions lines by gravity NEW DISTRIBUTION LINE 2b NEW TANK B C D DOWNHILL

Supply Pipe 1 Materials List 2” PVC pipe (Schedule 40) in 6 m lengths – 26 pieces 2” PVC 90° Elbow – 1 piece PVC primer, PVC cement, applicators, and cleanup Gate/Ball valves (PVC) – 2 pieces Bed material for trench (2-12 mm), if necessary Fill material, if necessary Brick for Valve boxes Mortar for valve boxes Lids for valve boxes Tools for cutting, de-burring, connecting pipe, mixing concrete Tools for digging trench

DOWNHILL Map of current Las Delicias Water System from ADESCO with approx house locations indicated

Summary of Existing Water System

260 Homes Served by Tanque 3 33 Homes Served by Tanque Homes Served by Tanque 1 Current Water Distribution System DOWNHILL

Modified water system

117 Homes Served by Tanque 3 33 Homes Served by Tanque Homes Served by Tanque 1 Proposed Water Distribution System 280 Homes Served by New Tank DOWNHILL

Summary of potential changes in water distribution system CURRENT SYSTEM Storage – Tanque 1: 35,000 gal – Tanque 2: 11,000 gal – Tanque 3: 25,000 gal Pump supplies water to Tanques 1 & 3 at 175 gpm, ~3 days per week Spring supplies water to Tanque 2 (and other tanques) Homes serviced by Tanques PROPOSED MODIFICATION Storage – Tanque 1: 35,000 gal – Tanque 2: 11,000 gal – Tanque 3: 25,000 gal – New Tank: 28,600 gal Current 65 HP Pump supplies water to Tanques 1 & 3 at 175 gpm New pump supplies water to new tank at 175 gpm with much lower head Homes serviced by Tanques New: 280 New tank reduces demand of water from Tanques 1&2 (which require high head) by roughly 50%