Skip to main content

Table 2 Historic rainfall regressions

From: Complex interactions between climate change, sanitation, and groundwater quality: a case study from Ramotswa, BotswanaInteractions complexes entre changement climatique, assainissement et qualité des eaux souterraines: un cas d’étude à Ramotswa, BotswanaInteracciones complejas entre cambio climático, saneamiento y calidad del agua subterránea: un estudio de caso de Ramotswa, Botswana气候变化、卫生设施和地下水水质之间的复杂相互作用:博茨瓦纳拉莫茨瓦的一个研究案例Interações complexas entre mudanças climáticas, saneamento e qualidade das águas subterrâneas: estudo de caso de Ramotswa, Botswana

Model Estimate Standard error p Adjusted R2 Model p
1. Seasonal rainfall total = year + season (reference level is dry season)    73% <0.001
 (Intercept) 76.572 7.511 <0.001b   
 Year −0.552 0.193 <0.01b   
 Wet season 359.565 10.469 <0.001b   
2. Number rainy days = (year × season) + station (reference levels are dry season and Gaborone station)    81% <0.001
 (Intercept) 13.431 0.720 <0.001b   
 Year −0.040 0.021 0.062b   
 Wet season 30.451 0.779 <0.001b   
 Lobatse station −6.580 0.848 <0.001b   
 Ramotswa station −13.600 1.221 <0.001b   
 Year × wet season −0.180 0.029 <0.001b   
3. Intensitya = year + season + station (reference levels are dry season and Gaborone station)    35% <0.001
 (Intercept) 2.700 0.061 <0.001b   
 Year 0.007 0.001 <0.001b   
 Wet season 0.435 0.066 <0.001b   
 Lobatse station 0.519 0.072 <0.001b   
 Ramotswa station 1.023 0.103 <0.001b   
4. CV = year × season (reference level is dry season)    64% <0.001
 (Intercept) 1.724 0.260 <0.001b   
 Year 0.004 0.001 <0.001b   
 Wet season −0.995 0.037 <0.001b   
 Year × wet season −0.003 0.001 <0.05b   
5. Seasonal total mm = year × percentile group × season (reference levels are middle 80% and dry season)   90% <0.001
 (intercept) 65.162 5.214 <0.001b   
 Year −0.145 0.194 0.456   
 Upper 10th percentile 142.046 15.237 <0.001b   
 Lower 10th percentile −60.271 15.136 <0.001b   
 Wet season 375.420 7.450 <0.001b   
 Year × upper −1.160 0.607 0.057b   
 Year × lower 0.080 0.510 0.875   
 Year × middle × wet −0.218 0.278 0.432   
 Wet season, upper 10th perc. 130.839 21.970 <0.001b   
 Wet season, lower 10th perc. −157.296 22.076 <0.001b   
 Year × upper × wet 2.056 0.892 <0.05b   
 Year × lower × wet −0.804 0.764 0.294   
  1. For all models, year is centered on the mean year
  2. a(Intensity + 0.5)1/2
  3. bIndicates statistical significance