- 2074 Chaitra · 8 marks
Demand of rural municipality 2018, 15,000 pop
Short answer
Design population in 2040 is 22,210. Applying rural unit rates and 15% losses gives average demand 1,566 m3/day or 18.1 l/s; maximum day demand is about 27.2 l/s.
Data obtained from a baseline survey of a newly formed rural municipality in year 2018 A.D. are as follows. Population = 15,000, No. of day students in school = 1500, No. of big animals = 6500, No. of small animals = 8000. There are altogether 10 offices, one hospital with total 25 beds, No. of tea shops = 12, No. of health post = 2 and number of police check post = 2. Neglect fire fighting demand. Calculate the water demand of that rural municipality in design year with base period of 2 years and design period of 20 years. Assume the population growth rate of that community is 1.8 % per annum.
Survey year 2018; base period 2 years and design period 20 years, so the design year is 2040, years after the survey.
Design population
Water demand
Design values assumed (Nepal rural water supply practice): domestic 45 lpcd (public taps); day scholar 5 l/d; boarder 45 l/d; office staff 45 l/d with 10 staff per office; big animal (cow, buffalo) 45 l/d; small animal (goat, pig) 5 l/d; poultry 0.2 l/d; health post 1000 l/d; tea shop 500 l/d; losses and wastage 15% of net demand; maximum day factor 1.5 and peak hour factor 3. Hospital 340 l/bed/d (IS 1172). Fire demand is neglected.
| Demand | Quantity | Rate | Demand (l/day) |
|---|---|---|---|
| Domestic (45 lpcd) | 22,210 | 45 l/c/d | 999,436 |
| Day students | 1,500 | 5 l/c/d | 7,500 |
| Big animals | 6,500 | 45 l/d | 292,500 |
| Small animals | 8,000 | 5 l/d | 40,000 |
| Offices (10 staff each) | 100 | 45 l/staff | 4,500 |
| Hospital (25 beds) | 25 | 340 l/bed/d | 8,500 |
| Tea shops | 12 | 500 l/d | 6,000 |
| Health posts | 2 | 1000 l/d | 2,000 |
| Police check posts (10 staff each) | 20 | 45 l/staff | 900 |
| Net demand | 1,361,336 |
Losses and wastage of net demand l/day
Answer: Design population = 22,210; average daily water demand = 1,566 m/day (18.1 l/s); maximum day demand = 27.2 l/s.
✓ Answer checked by Claude Opus 5.5 (high effort)
Related questions
- Demand of new municipality 2016, 45,000 pop · Water Supply Engineering, chapter 3 · asked 2×
- Population in survey year from design demand 800 m3 · Water Supply Engineering, chapter 3 · asked 2×
- Demand of rural municipality, base period 3 years · Water Supply Engineering, chapter 3
- Rural village demand, survey 2070 BS, base year 2073 · Water Supply Engineering, chapter 3
- Demand of rural area survey 2019, 1.77% growth · Water Supply Engineering, chapter 3
- Total demand, village survey 2013, design 15 years · Water Supply Engineering, chapter 3 · asked 2×