Table:
Serial number | River | Name | Area (km²) | District | Co-ordinate | Altitude (m)
1.0 | Bharathapuzha | Malampuzha | 23.13 | Palakkad | 10°50′N 76°41′E\ufeff / \ufeff10.84°N 76.69°E | 104.0
2.0 | Bharathapuzha | Mangalam | 3.93 | Palakkad | 10°31′N 76°32′E\ufeff / \ufeff10.51°N 76.54°E | 72.0
3.0 | Bharathapuzha | Meenkara | 2.59 | Palakkad | 10°37′N 76°48′E\ufeff / \ufeff10.62°N 76.80°E | 152.0
4.0 | Bharathapuzha | Chulliar | 1.59 | Palakkad | 10°35′N 76°46′E\ufeff / \ufeff10.59°N 76.77°E | 143.0
5.0 | Bharathapuzha | Pothundi | 3.63 | Palakkad | 10°32′N 76°38′E\ufeff / \ufeff10.54°N 76.63°E | 93.0
6.0 | Bharathapuzha | Walayar | 2.59 | Palakkad | 10°50′N 76°52′E\ufeff / \ufeff10.84°N 76.86°E | 197.0
7.0 | Bharathapuzha | Kanjirampuzha | 5.12 | Palakkad | 10°59′N 76°33′E\ufeff / \ufeff10.98°N 76.55°E | 90.0
8.0 | Chalakkudy | Parambikulam | 20.92 | Palakkad | 10°23′N 76°48′E\ufeff / \ufeff10.39°N 76.8°E | 545.0
9.0 | Chalakkudy | Thunakkadavu | 2.83 | Palakkad | 10°25′59″N 76°47′02″E\ufeff / \ufeff10.433°N 76.784°E | 565.0
10.0 | Chalakkudy | Peruvaaripallam |  | Palakkad | 10°26′49″N 76°46′12″E\ufeff / \ufeff10.447°N 76.77°E | 565.0
11.0 | Chalakkudy | Sholayar Dam | 8.7 | Thrissur | 10° 17' 76° 45' | 
12.0 | Chalakkudy | Peringalkuthu Dam | 2.63 | Thrissur |  | 
13.0 | Kallada | Parappar | 25.9 | Kollam | 09° 57\' 77° 4\'20" | 
14.0 | Karamana | Aruvikkara | 2.58 | Thiruvananthapuram | 08° 28' 77° 58' | 
15.0 | Karuvanoor | Peechi | 12.63 | Thrissur | 10°32′N 76°23′E\ufeff / \ufeff10.53°N 76.39°E | 73.0
16.0 | Keecheri | Vazhani | 2.55 | Thrissur | 10° 40' 76° 15' | 
17.0 | Kuttiadi | Kuttiadi | 10.52 | Kozhikode | 11° 36\' 75° 49\'27" | 
18.0 | Neyyar | Neyyar | 15.0 | Thiruvananthapuram | 08° 32' 77° 08' | 
19.0 | Pamba | Pamba | 5.7 | Pathanamthitta | 09° 20' 76° 53' | 
20.0 | Pamba | Kakki | 18.0 | Pathanamthitta |  | 
21.0 | Periyar | Idukki | 61.6 | Idukki | 09° 48' 76° 53' | 720.0
22.0 | Periyar | Ponmudi | 2.6 | Idukki | 09° 55' 77° 05' | 
23.0 | Periyar | Anayirankal | 4.33 | Idukki | 10° 0' 77° 0' | 
24.0 | Periyar | Kundala | 2.3 | Idukki | 10° 0' 77° 0' | 
25.0 | Periyar | Mattupatti | 3.24 | Idukki | 10° 05' 77° 05' | 
26.0 | Periyar | Sengulam | 0.33 | Idukki | 10° 00' 77° 05' | 
27.0 | Periyar | Neriamangalam | 4.13 | Idukki |  | 
28.0 | Periyar | Bhoothathankettu | 6.08 | Idukki |  | 
29.0 | Periyar | Periyar lake | 28.9 | Idukki | 10° 10' 76° 15' | 
30.0 | Valapattanam | Pazhassi | 6.48 | Kannur |  | 
31.0 | Vamanapuram | Peppara | 5.82 | Thiruvananthapuram |  | 
32.0 | Muvattupuzhayar | Malankara | 11.0 | Idukki |  | 
33.0 | Chimmini dam | Thrissur | 85.067 | Thrissur |  |

Question: tell me reservoir that is from the sme river as parambikulam.
Answer: Thunakkadavu

Question: what is the name of the district listed after thrissur?
Answer: Kollam

Question: what is the name of the only reservoir in the kannur district?
Answer: Valapattanam

Question: what is the difference in altitude between thunakkadavu and peechi?
Answer: 492

Question: how many have an area of at least 20 km?
Answer: 6

Question: what is the name of the river listed before chalakkudy?
Answer: Bharathapuzha

Question: name a reservoir that has an altitude of more than 100 but less than 500.
Answer: Malampuzha

Question: how many are in the palakkad district?
Answer: 10