KDP categories · Top KDP authors
Hydrology (Environmental, Kindle eBooks): Amazon KDP category data
Amazon Kindle eBooks Best Sellers data for Hydrology (Environmental, Kindle eBooks), updated Nov 2, 2026: median price $9.99, median 18 reviews, average rating 4.4 and a KDPTop opportunity score of 22/100 (highly competitive).
| Price range (middle 50%) | $6.14 – $19.99 |
|---|---|
| Average rating | 4.4 |
| New releases (90 days) | 12% |
| Books on the list | 100 |
| Store | Kindle eBooks |
What stands out
- Its median reviews are 28% of the parent category Environmental (64), one of the easier corners under it.
- Its review barrier is lower than in 74% of Kindle eBooks categories: the median best seller has only 18 reviews, so new books can chart with few.
- Prices spread wide: the middle half runs from $6.14 to $19.99, so budget editions and premium or boxed sets sell side by side.
Top 10 Hydrology best sellers
-
Scientific American September 2026
- List rank#1
- Price$6.99
- Rating4.8
- Reviews13
-
Scientific American October 2026
- List rank#2
- Price$6.99
- Rating4.2
- Reviews7
-
Scientific American June 2026
- List rank#3
- Price$6.99
- Rating4.4
- Reviews42
-
Scientific American November 2026
- List rank#4
- Price$6.99
- Reviews-
-
The Three Ages of Water: Prehistoric Past, Imperiled Present, and a Hope for the Future
by Peter Gleick
- List rank#5
- Price$1.99
- Rating4.6
- Reviews58
-
North Carolina Waterfalls
by Kevin Adams
- List rank#6
- Price$8.89
- Rating4.9
- Reviews459
-
Scientific American May 2026
- List rank#7
- Price$6.99
- Rating4.0
- Reviews1
-
Scientific American July/August 2026
- List rank#8
- Price$6.99
- Rating4.7
- Reviews8
-
Scientific American 14th April 2026
- List rank#9
- Price$6.99
- Rating4.5
- Reviews11
-
The DIY Atmospheric Water Generator Blueprint: Build Your Own Off-Grid Water System and Produce Clean Drinking Water from Air – A Step-by-Step Guide (No Well, No Rain, No Grid Required)
by Vijay Vijay
- List rank#10
- Price$0.99
- Rating1.0
- Reviews2
FAQ
Is Hydrology a good niche for Amazon KDP?
Its KDPTop opportunity score is 22/100, which makes it highly competitive. The median best seller has 18 reviews and sells for $9.99.
How many reviews do you need to rank in Hydrology?
The median best seller has 18 reviews, and 83% of them have fewer than 100.
What do Hydrology best sellers cost?
The median price is $9.99; half of the best sellers are priced between $6.14 and $19.99.
Can new books break into Hydrology?
12% of the current best sellers were released in the last 90 days.
About this data
Data comes from KDPTop's daily crawl of Amazon's public Best Sellers pages; medians use the latest list. The opportunity score (0–100, higher is easier to enter) combines the review barrier, the share of low-review books, list turnover, new-release share and price.