Page 194 - Water and wastewater engineering

WELLS 4-49

EXTRACT FROM WELL LOG
Location: Pancake, TX (approx. 5.6 km west of Waffle)

Boring results (surface elevation at 323 m)
Depth, m Soil description
0–1.8 Soil (Selkirk)
1.8–8.2 Clay, red
8.2–54.0 Galena dolomite
54.0–92.0 Maquoketa shale
92.0–133.9 Someko sand
133.9 Well terminated in shale

Pumping test results
Static water level before pumping began: 38.7 m below grade
3
Drawdown in observation well 91.4 from test well pumped at 0.095 m /s.
Time from start Drawdown from static
of pumping, min water level, m
20 2.00
100 2.68
1500 3.79

4-24. Your firm has been retained to develop plans for a well system for the Bastogne
Retirement Center. Using the design elements listed below Problem 4-22 and the fol-
lowing data, design the well system.
a. Population: 150
b. Demand: 400 Lpcd
c. Water is to be supplied from wells. No treatment will be provided.
d. Top of reservoir is 35.8 m above ground level
e. Friction losses minor losses in piping from well to top of reservoir 0.25 m
f. Water supply is to be chlorinated, but no other treatment will be provided.

TEST BORING RESULTS
Bastogne Retirement Center
Bore hole no. 3 (surface elevation: 164 m)
Strata Thickness, m Depth to bottom of strata, m
Soil (Emmet-Trenary) 1.5 1.5
Sandy loam 5.1 6.6
Silty clay 6.1 12.7
Clay 6.1 18.8
Unconsolidated sandy clay (water at 6.7 m) 75.6 94.4
Clay 30.5 124.9
Sand and gravel 45.7 170.6
Shale Boring terminated at 170.6 m